dnsforward -- Move querylog from coredns plugin, a more complex migration with proper API took too long so a simple move was used instead to save time.
This commit is contained in:
Eugene Bujak
parent
e5d2f883ac
commit
052f975762
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@ -7,6 +7,7 @@ import (
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"reflect"
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"strings"
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"sync"
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"time"
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"github.com/AdguardTeam/AdGuardHome/dnsfilter"
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"github.com/joomcode/errorx"
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@ -186,6 +187,19 @@ func (s *Server) Start(config *ServerConfig) error {
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}
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}
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log.Printf("Loading stats from querylog")
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err := fillStatsFromQueryLog()
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if err != nil {
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log.Printf("Failed to load stats from querylog: %s", err)
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return err
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}
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once.Do(func() {
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go periodicQueryLogRotate()
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go periodicHourlyTopRotate()
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go statsRotator()
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})
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go s.packetLoop()
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return nil
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@ -346,12 +360,12 @@ func (s *Server) reconfigureFiltering(new ServerConfig) {
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}
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s.Lock()
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oldDnsFilter := s.dnsFilter
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oldDNSFilter := s.dnsFilter
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s.dnsFilter = dnsFilter
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s.FilteringConfig = new.FilteringConfig
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s.Unlock()
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oldDnsFilter.Destroy()
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oldDNSFilter.Destroy()
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}
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func (s *Server) Reconfigure(new ServerConfig) error {
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@ -370,15 +384,13 @@ func (s *Server) Reconfigure(new ServerConfig) error {
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// packet handling functions
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//
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func (s *Server) handlePacket(p []byte, addr net.Addr, conn *net.UDPConn) {
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// handlePacketInternal processes the incoming packet bytes and returns with an optional response packet.
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//
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// If an empty dns.Msg is returned, do not try to send anything back to client, otherwise send contents of dns.Msg.
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//
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// If an error is returned, log it, don't try to generate data based on that error.
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func (s *Server) handlePacketInternal(msg *dns.Msg, addr net.Addr, conn *net.UDPConn) (*dns.Msg, *dnsfilter.Result, Upstream, error) {
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// log.Printf("Got packet %d bytes from %s: %v", len(p), addr, p)
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msg := dns.Msg{}
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err := msg.Unpack(p)
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if err != nil {
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log.Printf("failed to unpack DNS packet: %s", err)
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return
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}
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//
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// DNS packet byte format is valid
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//
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@ -386,11 +398,7 @@ func (s *Server) handlePacket(p []byte, addr net.Addr, conn *net.UDPConn) {
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// log.Printf("Unpacked: %v", msg.String())
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if len(msg.Question) != 1 {
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log.Printf("Got invalid number of questions: %v", len(msg.Question))
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err := s.respondWithServerFailure(&msg, addr, conn)
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if err != nil {
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log.Printf("Couldn't respond to UDP packet: %s", err)
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return
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}
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return s.genServerFailure(msg), nil, nil, nil
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}
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// use dnsfilter before cache -- changed settings or filters would require cache invalidation otherwise
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@ -398,73 +406,61 @@ func (s *Server) handlePacket(p []byte, addr net.Addr, conn *net.UDPConn) {
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res, err := s.dnsFilter.CheckHost(host)
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if err != nil {
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log.Printf("dnsfilter failed to check host '%s': %s", host, err)
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err := s.respondWithServerFailure(&msg, addr, conn)
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if err != nil {
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log.Printf("Couldn't respond to UDP packet: %s", err)
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return
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}
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return s.genServerFailure(msg), &res, nil, err
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} else if res.IsFiltered {
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log.Printf("Host %s is filtered, reason - '%s', matched rule: '%s'", host, res.Reason, res.Rule)
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err := s.respondWithNXDomain(&msg, addr, conn)
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if err != nil {
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log.Printf("Couldn't respond to UDP packet: %s", err)
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return
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}
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return s.genNXDomain(msg), &res, nil, nil
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}
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{
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val, ok := s.cache.Get(&msg)
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val, ok := s.cache.Get(msg)
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if ok && val != nil {
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err = s.respond(val, addr, conn)
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if err != nil {
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if isConnClosed(err) {
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// ignore this error, the connection was closed and that's ok
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return
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}
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log.Printf("Couldn't respond to UDP packet: %s", err)
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return
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}
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return
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return val, &res, nil, nil
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}
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}
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// TODO: replace with single-socket implementation
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upstream := s.chooseUpstream()
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reply, err := upstream.Exchange(&msg)
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reply, err := upstream.Exchange(msg)
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if err != nil {
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log.Printf("talking to upstream failed for host '%s': %s", host, err)
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err := s.respondWithServerFailure(&msg, addr, conn)
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if err != nil {
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if isConnClosed(err) {
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// ignore this error, the connection was closed and that's ok
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return
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}
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log.Printf("Couldn't respond to UDP packet with server failure: %s", err)
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return
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}
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return
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return s.genServerFailure(msg), &res, upstream, err
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}
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if reply == nil {
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log.Printf("SHOULD NOT HAPPEN upstream returned empty message for host '%s'. Request is %v", host, msg.String())
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err := s.respondWithServerFailure(&msg, addr, conn)
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if err != nil {
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log.Printf("Couldn't respond to UDP packet with should not happen: %s", err)
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return
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}
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return
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}
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err = s.respond(reply, addr, conn)
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if err != nil {
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if isConnClosed(err) {
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// ignore this error, the connection was closed and that's ok
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return
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}
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log.Printf("Couldn't respond to UDP packet: %s", err)
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return
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return s.genServerFailure(msg), &res, upstream, nil
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}
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s.cache.Set(reply)
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return reply, &res, upstream, nil
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}
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func (s *Server) handlePacket(p []byte, addr net.Addr, conn *net.UDPConn) {
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start := time.Now()
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msg := &dns.Msg{}
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err := msg.Unpack(p)
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if err != nil {
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log.Printf("got invalid DNS packet: %s", err)
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return // do nothing
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}
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reply, result, upstream, err := s.handlePacketInternal(msg, addr, conn)
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if reply != nil {
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rerr := s.respond(reply, addr, conn)
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if rerr != nil {
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log.Printf("Couldn't respond to UDP packet: %s", err)
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}
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}
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// query logging and stats counters
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elapsed := time.Since(start)
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upstreamAddr := ""
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if upstream != nil {
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upstreamAddr = upstream.Address()
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}
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logRequest(msg, reply, result, elapsed, addr.String(), upstreamAddr)
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}
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//
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@ -491,17 +487,17 @@ func (s *Server) respond(resp *dns.Msg, addr net.Addr, conn *net.UDPConn) error
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return nil
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}
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func (s *Server) respondWithServerFailure(request *dns.Msg, addr net.Addr, conn *net.UDPConn) error {
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func (s *Server) genServerFailure(request *dns.Msg) *dns.Msg {
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resp := dns.Msg{}
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resp.SetRcode(request, dns.RcodeServerFailure)
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return s.respond(&resp, addr, conn)
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return &resp
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}
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func (s *Server) respondWithNXDomain(request *dns.Msg, addr net.Addr, conn *net.UDPConn) error {
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func (s *Server) genNXDomain(request *dns.Msg) *dns.Msg {
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resp := dns.Msg{}
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resp.SetRcode(request, dns.RcodeNameError)
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resp.Ns = s.genSOA(request)
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return s.respond(&resp, addr, conn)
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return &resp
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}
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func (s *Server) genSOA(request *dns.Msg) []dns.RR {
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@ -537,3 +533,5 @@ func (s *Server) genSOA(request *dns.Msg) []dns.RR {
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}
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return []dns.RR{&soa}
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}
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var once sync.Once
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@ -0,0 +1,224 @@
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package dnsforward
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import (
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"encoding/json"
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"fmt"
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"log"
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"net/http"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/AdguardTeam/AdGuardHome/dnsfilter"
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"github.com/miekg/dns"
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)
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const (
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logBufferCap = 5000 // maximum capacity of logBuffer before it's flushed to disk
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queryLogTimeLimit = time.Hour * 24 // how far in the past we care about querylogs
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queryLogRotationPeriod = time.Hour * 24 // rotate the log every 24 hours
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queryLogFileName = "querylog.json" // .gz added during compression
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queryLogSize = 5000 // maximum API response for /querylog
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queryLogTopSize = 500 // Keep in memory only top N values
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)
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var (
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logBufferLock sync.RWMutex
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logBuffer []*logEntry
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queryLogCache []*logEntry
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queryLogLock sync.RWMutex
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)
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type logEntry struct {
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Question []byte
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Answer []byte `json:",omitempty"` // sometimes empty answers happen like binerdunt.top or rev2.globalrootservers.net
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Result *dnsfilter.Result
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Time time.Time
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Elapsed time.Duration
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IP string
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Upstream string `json:",omitempty"` // if empty, means it was cached
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}
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func logRequest(question *dns.Msg, answer *dns.Msg, result *dnsfilter.Result, elapsed time.Duration, ip string, upstream string) {
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var q []byte
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var a []byte
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var err error
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if question != nil {
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q, err = question.Pack()
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if err != nil {
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log.Printf("failed to pack question for querylog: %s", err)
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return
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}
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}
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if answer != nil {
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a, err = answer.Pack()
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if err != nil {
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log.Printf("failed to pack answer for querylog: %s", err)
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return
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}
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}
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now := time.Now()
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entry := logEntry{
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Question: q,
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Answer: a,
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Result: result,
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Time: now,
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Elapsed: elapsed,
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IP: ip,
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Upstream: upstream,
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}
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var flushBuffer []*logEntry
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logBufferLock.Lock()
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logBuffer = append(logBuffer, &entry)
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if len(logBuffer) >= logBufferCap {
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flushBuffer = logBuffer
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logBuffer = nil
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}
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logBufferLock.Unlock()
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queryLogLock.Lock()
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queryLogCache = append(queryLogCache, &entry)
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if len(queryLogCache) > queryLogSize {
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toremove := len(queryLogCache) - queryLogSize
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queryLogCache = queryLogCache[toremove:]
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}
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queryLogLock.Unlock()
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// add it to running top
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err = runningTop.addEntry(&entry, question, now)
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if err != nil {
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log.Printf("Failed to add entry to running top: %s", err)
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// don't do failure, just log
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}
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incrementCounters(&entry)
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// if buffer needs to be flushed to disk, do it now
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if len(flushBuffer) > 0 {
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// write to file
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// do it in separate goroutine -- we are stalling DNS response this whole time
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go flushToFile(flushBuffer)
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}
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}
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func HandleQueryLog(w http.ResponseWriter, r *http.Request) {
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queryLogLock.RLock()
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values := make([]*logEntry, len(queryLogCache))
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copy(values, queryLogCache)
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queryLogLock.RUnlock()
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// reverse it so that newest is first
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for left, right := 0, len(values)-1; left < right; left, right = left+1, right-1 {
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values[left], values[right] = values[right], values[left]
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}
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var data = []map[string]interface{}{}
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for _, entry := range values {
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var q *dns.Msg
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var a *dns.Msg
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if len(entry.Question) > 0 {
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q = new(dns.Msg)
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if err := q.Unpack(entry.Question); err != nil {
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// ignore, log and move on
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log.Printf("Failed to unpack dns message question: %s", err)
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q = nil
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}
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}
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if len(entry.Answer) > 0 {
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a = new(dns.Msg)
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if err := a.Unpack(entry.Answer); err != nil {
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// ignore, log and move on
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log.Printf("Failed to unpack dns message question: %s", err)
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a = nil
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}
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}
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jsonEntry := map[string]interface{}{
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"reason": entry.Result.Reason.String(),
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"elapsedMs": strconv.FormatFloat(entry.Elapsed.Seconds()*1000, 'f', -1, 64),
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"time": entry.Time.Format(time.RFC3339),
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"client": entry.IP,
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}
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if q != nil {
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jsonEntry["question"] = map[string]interface{}{
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"host": strings.ToLower(strings.TrimSuffix(q.Question[0].Name, ".")),
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"type": dns.Type(q.Question[0].Qtype).String(),
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"class": dns.Class(q.Question[0].Qclass).String(),
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}
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}
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if a != nil {
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jsonEntry["status"] = dns.RcodeToString[a.Rcode]
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}
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if len(entry.Result.Rule) > 0 {
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jsonEntry["rule"] = entry.Result.Rule
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jsonEntry["filterId"] = entry.Result.FilterID
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}
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if a != nil && len(a.Answer) > 0 {
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var answers = []map[string]interface{}{}
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for _, k := range a.Answer {
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header := k.Header()
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answer := map[string]interface{}{
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"type": dns.TypeToString[header.Rrtype],
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"ttl": header.Ttl,
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}
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// try most common record types
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switch v := k.(type) {
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case *dns.A:
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answer["value"] = v.A
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case *dns.AAAA:
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answer["value"] = v.AAAA
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case *dns.MX:
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answer["value"] = fmt.Sprintf("%v %v", v.Preference, v.Mx)
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case *dns.CNAME:
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answer["value"] = v.Target
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case *dns.NS:
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answer["value"] = v.Ns
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case *dns.SPF:
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answer["value"] = v.Txt
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case *dns.TXT:
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answer["value"] = v.Txt
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case *dns.PTR:
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answer["value"] = v.Ptr
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case *dns.SOA:
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answer["value"] = fmt.Sprintf("%v %v %v %v %v %v %v", v.Ns, v.Mbox, v.Serial, v.Refresh, v.Retry, v.Expire, v.Minttl)
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case *dns.CAA:
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answer["value"] = fmt.Sprintf("%v %v \"%v\"", v.Flag, v.Tag, v.Value)
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case *dns.HINFO:
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answer["value"] = fmt.Sprintf("\"%v\" \"%v\"", v.Cpu, v.Os)
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case *dns.RRSIG:
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answer["value"] = fmt.Sprintf("%v %v %v %v %v %v %v %v %v", dns.TypeToString[v.TypeCovered], v.Algorithm, v.Labels, v.OrigTtl, v.Expiration, v.Inception, v.KeyTag, v.SignerName, v.Signature)
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default:
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// type unknown, marshall it as-is
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answer["value"] = v
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}
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answers = append(answers, answer)
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}
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jsonEntry["answer"] = answers
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}
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data = append(data, jsonEntry)
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}
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jsonVal, err := json.Marshal(data)
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if err != nil {
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errorText := fmt.Sprintf("Couldn't marshal data into json: %s", err)
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log.Println(errorText)
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http.Error(w, errorText, http.StatusInternalServerError)
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return
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}
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w.Header().Set("Content-Type", "application/json")
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_, err = w.Write(jsonVal)
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if err != nil {
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errorText := fmt.Sprintf("Unable to write response json: %s", err)
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log.Println(errorText)
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http.Error(w, errorText, http.StatusInternalServerError)
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}
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}
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@ -0,0 +1,253 @@
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package dnsforward
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import (
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"bytes"
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"compress/gzip"
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"encoding/json"
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"fmt"
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"log"
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"os"
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"sync"
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"time"
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"github.com/go-test/deep"
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)
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var (
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fileWriteLock sync.Mutex
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)
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const enableGzip = false
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func flushToFile(buffer []*logEntry) error {
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if len(buffer) == 0 {
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return nil
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}
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start := time.Now()
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var b bytes.Buffer
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e := json.NewEncoder(&b)
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for _, entry := range buffer {
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err := e.Encode(entry)
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if err != nil {
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log.Printf("Failed to marshal entry: %s", err)
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return err
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}
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}
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elapsed := time.Since(start)
|
||||
log.Printf("%d elements serialized via json in %v: %d kB, %v/entry, %v/entry", len(buffer), elapsed, b.Len()/1024, float64(b.Len())/float64(len(buffer)), elapsed/time.Duration(len(buffer)))
|
||||
|
||||
err := checkBuffer(buffer, b)
|
||||
if err != nil {
|
||||
log.Printf("failed to check buffer: %s", err)
|
||||
return err
|
||||
}
|
||||
|
||||
var zb bytes.Buffer
|
||||
filename := queryLogFileName
|
||||
|
||||
// gzip enabled?
|
||||
if enableGzip {
|
||||
filename += ".gz"
|
||||
|
||||
zw := gzip.NewWriter(&zb)
|
||||
zw.Name = queryLogFileName
|
||||
zw.ModTime = time.Now()
|
||||
|
||||
_, err = zw.Write(b.Bytes())
|
||||
if err != nil {
|
||||
log.Printf("Couldn't compress to gzip: %s", err)
|
||||
zw.Close()
|
||||
return err
|
||||
}
|
||||
|
||||
if err = zw.Close(); err != nil {
|
||||
log.Printf("Couldn't close gzip writer: %s", err)
|
||||
return err
|
||||
}
|
||||
} else {
|
||||
zb = b
|
||||
}
|
||||
|
||||
fileWriteLock.Lock()
|
||||
defer fileWriteLock.Unlock()
|
||||
f, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644)
|
||||
if err != nil {
|
||||
log.Printf("failed to create file \"%s\": %s", filename, err)
|
||||
return err
|
||||
}
|
||||
defer f.Close()
|
||||
|
||||
n, err := f.Write(zb.Bytes())
|
||||
if err != nil {
|
||||
log.Printf("Couldn't write to file: %s", err)
|
||||
return err
|
||||
}
|
||||
|
||||
log.Printf("ok \"%s\": %v bytes written", filename, n)
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func checkBuffer(buffer []*logEntry, b bytes.Buffer) error {
|
||||
l := len(buffer)
|
||||
d := json.NewDecoder(&b)
|
||||
|
||||
i := 0
|
||||
for d.More() {
|
||||
entry := &logEntry{}
|
||||
err := d.Decode(entry)
|
||||
if err != nil {
|
||||
log.Printf("Failed to decode: %s", err)
|
||||
return err
|
||||
}
|
||||
if diff := deep.Equal(entry, buffer[i]); diff != nil {
|
||||
log.Printf("decoded buffer differs: %s", diff)
|
||||
return fmt.Errorf("decoded buffer differs: %s", diff)
|
||||
}
|
||||
i++
|
||||
}
|
||||
if i != l {
|
||||
err := fmt.Errorf("check fail: %d vs %d entries", l, i)
|
||||
log.Print(err)
|
||||
return err
|
||||
}
|
||||
log.Printf("check ok: %d entries", i)
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func rotateQueryLog() error {
|
||||
from := queryLogFileName
|
||||
to := queryLogFileName + ".1"
|
||||
|
||||
if enableGzip {
|
||||
from = queryLogFileName + ".gz"
|
||||
to = queryLogFileName + ".gz.1"
|
||||
}
|
||||
|
||||
if _, err := os.Stat(from); os.IsNotExist(err) {
|
||||
// do nothing, file doesn't exist
|
||||
return nil
|
||||
}
|
||||
|
||||
err := os.Rename(from, to)
|
||||
if err != nil {
|
||||
log.Printf("Failed to rename querylog: %s", err)
|
||||
return err
|
||||
}
|
||||
|
||||
log.Printf("Rotated from %s to %s successfully", from, to)
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func periodicQueryLogRotate() {
|
||||
for range time.Tick(queryLogRotationPeriod) {
|
||||
err := rotateQueryLog()
|
||||
if err != nil {
|
||||
log.Printf("Failed to rotate querylog: %s", err)
|
||||
// do nothing, continue rotating
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func genericLoader(onEntry func(entry *logEntry) error, needMore func() bool, timeWindow time.Duration) error {
|
||||
now := time.Now()
|
||||
// read from querylog files, try newest file first
|
||||
files := []string{}
|
||||
|
||||
if enableGzip {
|
||||
files = []string{
|
||||
queryLogFileName + ".gz",
|
||||
queryLogFileName + ".gz.1",
|
||||
}
|
||||
} else {
|
||||
files = []string{
|
||||
queryLogFileName,
|
||||
queryLogFileName + ".1",
|
||||
}
|
||||
}
|
||||
|
||||
// read from all files
|
||||
for _, file := range files {
|
||||
if !needMore() {
|
||||
break
|
||||
}
|
||||
if _, err := os.Stat(file); os.IsNotExist(err) {
|
||||
// do nothing, file doesn't exist
|
||||
continue
|
||||
}
|
||||
|
||||
f, err := os.Open(file)
|
||||
if err != nil {
|
||||
log.Printf("Failed to open file \"%s\": %s", file, err)
|
||||
// try next file
|
||||
continue
|
||||
}
|
||||
defer f.Close()
|
||||
|
||||
var d *json.Decoder
|
||||
|
||||
if enableGzip {
|
||||
trace("Creating gzip reader")
|
||||
zr, err := gzip.NewReader(f)
|
||||
if err != nil {
|
||||
log.Printf("Failed to create gzip reader: %s", err)
|
||||
continue
|
||||
}
|
||||
defer zr.Close()
|
||||
|
||||
trace("Creating json decoder")
|
||||
d = json.NewDecoder(zr)
|
||||
} else {
|
||||
d = json.NewDecoder(f)
|
||||
}
|
||||
|
||||
i := 0
|
||||
over := 0
|
||||
max := 10000 * time.Second
|
||||
var sum time.Duration
|
||||
// entries on file are in oldest->newest order
|
||||
// we want maxLen newest
|
||||
for d.More() {
|
||||
if !needMore() {
|
||||
break
|
||||
}
|
||||
var entry logEntry
|
||||
err := d.Decode(&entry)
|
||||
if err != nil {
|
||||
log.Printf("Failed to decode: %s", err)
|
||||
// next entry can be fine, try more
|
||||
continue
|
||||
}
|
||||
|
||||
if now.Sub(entry.Time) > timeWindow {
|
||||
// trace("skipping entry") // debug logging
|
||||
continue
|
||||
}
|
||||
|
||||
if entry.Elapsed > max {
|
||||
over++
|
||||
} else {
|
||||
sum += entry.Elapsed
|
||||
}
|
||||
|
||||
i++
|
||||
err = onEntry(&entry)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
elapsed := time.Since(now)
|
||||
var perunit time.Duration
|
||||
var avg time.Duration
|
||||
if i > 0 {
|
||||
perunit = elapsed / time.Duration(i)
|
||||
avg = sum / time.Duration(i)
|
||||
}
|
||||
log.Printf("file \"%s\": read %d entries in %v, %v/entry, %v over %v, %v avg", file, i, elapsed, perunit, over, max, avg)
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
|
@ -0,0 +1,365 @@
|
|||
package dnsforward
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"fmt"
|
||||
"log"
|
||||
"net/http"
|
||||
"os"
|
||||
"path"
|
||||
"runtime"
|
||||
"sort"
|
||||
"strconv"
|
||||
"strings"
|
||||
"sync"
|
||||
"time"
|
||||
|
||||
"github.com/bluele/gcache"
|
||||
"github.com/miekg/dns"
|
||||
)
|
||||
|
||||
type hourTop struct {
|
||||
domains gcache.Cache
|
||||
blocked gcache.Cache
|
||||
clients gcache.Cache
|
||||
|
||||
mutex sync.RWMutex
|
||||
}
|
||||
|
||||
func (top *hourTop) init() {
|
||||
top.domains = gcache.New(queryLogTopSize).LRU().Build()
|
||||
top.blocked = gcache.New(queryLogTopSize).LRU().Build()
|
||||
top.clients = gcache.New(queryLogTopSize).LRU().Build()
|
||||
}
|
||||
|
||||
type dayTop struct {
|
||||
hours []*hourTop
|
||||
hoursLock sync.RWMutex // writelock this lock ONLY WHEN rotating or intializing hours!
|
||||
|
||||
loaded bool
|
||||
loadedLock sync.Mutex
|
||||
}
|
||||
|
||||
var runningTop dayTop
|
||||
|
||||
func init() {
|
||||
runningTop.hoursWriteLock()
|
||||
for i := 0; i < 24; i++ {
|
||||
hour := hourTop{}
|
||||
hour.init()
|
||||
runningTop.hours = append(runningTop.hours, &hour)
|
||||
}
|
||||
runningTop.hoursWriteUnlock()
|
||||
}
|
||||
|
||||
func rotateHourlyTop() {
|
||||
log.Printf("Rotating hourly top")
|
||||
hour := &hourTop{}
|
||||
hour.init()
|
||||
runningTop.hoursWriteLock()
|
||||
runningTop.hours = append([]*hourTop{hour}, runningTop.hours...)
|
||||
runningTop.hours = runningTop.hours[:24]
|
||||
runningTop.hoursWriteUnlock()
|
||||
}
|
||||
|
||||
func periodicHourlyTopRotate() {
|
||||
t := time.Hour
|
||||
for range time.Tick(t) {
|
||||
rotateHourlyTop()
|
||||
}
|
||||
}
|
||||
|
||||
func (top *hourTop) incrementValue(key string, cache gcache.Cache) error {
|
||||
top.Lock()
|
||||
defer top.Unlock()
|
||||
ivalue, err := cache.Get(key)
|
||||
if err == gcache.KeyNotFoundError {
|
||||
// we just set it and we're done
|
||||
err = cache.Set(key, 1)
|
||||
if err != nil {
|
||||
log.Printf("Failed to set hourly top value: %s", err)
|
||||
return err
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
if err != nil {
|
||||
log.Printf("gcache encountered an error during get: %s", err)
|
||||
return err
|
||||
}
|
||||
|
||||
cachedValue, ok := ivalue.(int)
|
||||
if !ok {
|
||||
err = fmt.Errorf("SHOULD NOT HAPPEN: gcache has non-int as value: %v", ivalue)
|
||||
log.Println(err)
|
||||
return err
|
||||
}
|
||||
|
||||
err = cache.Set(key, cachedValue+1)
|
||||
if err != nil {
|
||||
log.Printf("Failed to set hourly top value: %s", err)
|
||||
return err
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func (top *hourTop) incrementDomains(key string) error {
|
||||
return top.incrementValue(key, top.domains)
|
||||
}
|
||||
|
||||
func (top *hourTop) incrementBlocked(key string) error {
|
||||
return top.incrementValue(key, top.blocked)
|
||||
}
|
||||
|
||||
func (top *hourTop) incrementClients(key string) error {
|
||||
return top.incrementValue(key, top.clients)
|
||||
}
|
||||
|
||||
// if does not exist -- return 0
|
||||
func (top *hourTop) lockedGetValue(key string, cache gcache.Cache) (int, error) {
|
||||
ivalue, err := cache.Get(key)
|
||||
if err == gcache.KeyNotFoundError {
|
||||
return 0, nil
|
||||
}
|
||||
|
||||
if err != nil {
|
||||
log.Printf("gcache encountered an error during get: %s", err)
|
||||
return 0, err
|
||||
}
|
||||
|
||||
value, ok := ivalue.(int)
|
||||
if !ok {
|
||||
err := fmt.Errorf("SHOULD NOT HAPPEN: gcache has non-int as value: %v", ivalue)
|
||||
log.Println(err)
|
||||
return 0, err
|
||||
}
|
||||
|
||||
return value, nil
|
||||
}
|
||||
|
||||
func (top *hourTop) lockedGetDomains(key string) (int, error) {
|
||||
return top.lockedGetValue(key, top.domains)
|
||||
}
|
||||
|
||||
func (top *hourTop) lockedGetBlocked(key string) (int, error) {
|
||||
return top.lockedGetValue(key, top.blocked)
|
||||
}
|
||||
|
||||
func (top *hourTop) lockedGetClients(key string) (int, error) {
|
||||
return top.lockedGetValue(key, top.clients)
|
||||
}
|
||||
|
||||
func (r *dayTop) addEntry(entry *logEntry, q *dns.Msg, now time.Time) error {
|
||||
// figure out which hour bucket it belongs to
|
||||
hour := int(now.Sub(entry.Time).Hours())
|
||||
if hour >= 24 {
|
||||
log.Printf("t %v is >24 hours ago, ignoring", entry.Time)
|
||||
return nil
|
||||
}
|
||||
|
||||
hostname := strings.ToLower(strings.TrimSuffix(q.Question[0].Name, "."))
|
||||
|
||||
// get value, if not set, crate one
|
||||
runningTop.hoursReadLock()
|
||||
defer runningTop.hoursReadUnlock()
|
||||
err := runningTop.hours[hour].incrementDomains(hostname)
|
||||
if err != nil {
|
||||
log.Printf("Failed to increment value: %s", err)
|
||||
return err
|
||||
}
|
||||
|
||||
if entry.Result.IsFiltered {
|
||||
err := runningTop.hours[hour].incrementBlocked(hostname)
|
||||
if err != nil {
|
||||
log.Printf("Failed to increment value: %s", err)
|
||||
return err
|
||||
}
|
||||
}
|
||||
|
||||
if len(entry.IP) > 0 {
|
||||
err := runningTop.hours[hour].incrementClients(entry.IP)
|
||||
if err != nil {
|
||||
log.Printf("Failed to increment value: %s", err)
|
||||
return err
|
||||
}
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func fillStatsFromQueryLog() error {
|
||||
now := time.Now()
|
||||
runningTop.loadedWriteLock()
|
||||
defer runningTop.loadedWriteUnlock()
|
||||
if runningTop.loaded {
|
||||
return nil
|
||||
}
|
||||
onEntry := func(entry *logEntry) error {
|
||||
if len(entry.Question) == 0 {
|
||||
log.Printf("entry question is absent, skipping")
|
||||
return nil
|
||||
}
|
||||
|
||||
if entry.Time.After(now) {
|
||||
log.Printf("t %v vs %v is in the future, ignoring", entry.Time, now)
|
||||
return nil
|
||||
}
|
||||
|
||||
q := new(dns.Msg)
|
||||
if err := q.Unpack(entry.Question); err != nil {
|
||||
log.Printf("failed to unpack dns message question: %s", err)
|
||||
return err
|
||||
}
|
||||
|
||||
if len(q.Question) != 1 {
|
||||
log.Printf("malformed dns message, has no questions, skipping")
|
||||
return nil
|
||||
}
|
||||
|
||||
err := runningTop.addEntry(entry, q, now)
|
||||
if err != nil {
|
||||
log.Printf("Failed to add entry to running top: %s", err)
|
||||
return err
|
||||
}
|
||||
|
||||
queryLogLock.Lock()
|
||||
queryLogCache = append(queryLogCache, entry)
|
||||
if len(queryLogCache) > queryLogSize {
|
||||
toremove := len(queryLogCache) - queryLogSize
|
||||
queryLogCache = queryLogCache[toremove:]
|
||||
}
|
||||
queryLogLock.Unlock()
|
||||
|
||||
incrementCounters(entry)
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
needMore := func() bool { return true }
|
||||
err := genericLoader(onEntry, needMore, queryLogTimeLimit)
|
||||
if err != nil {
|
||||
log.Printf("Failed to load entries from querylog: %s", err)
|
||||
return err
|
||||
}
|
||||
|
||||
runningTop.loaded = true
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func HandleStatsTop(w http.ResponseWriter, r *http.Request) {
|
||||
domains := map[string]int{}
|
||||
blocked := map[string]int{}
|
||||
clients := map[string]int{}
|
||||
|
||||
do := func(keys []interface{}, getter func(key string) (int, error), result map[string]int) {
|
||||
for _, ikey := range keys {
|
||||
key, ok := ikey.(string)
|
||||
if !ok {
|
||||
continue
|
||||
}
|
||||
value, err := getter(key)
|
||||
if err != nil {
|
||||
log.Printf("Failed to get top domains value for %v: %s", key, err)
|
||||
return
|
||||
}
|
||||
result[key] += value
|
||||
}
|
||||
}
|
||||
|
||||
runningTop.hoursReadLock()
|
||||
for hour := 0; hour < 24; hour++ {
|
||||
runningTop.hours[hour].RLock()
|
||||
do(runningTop.hours[hour].domains.Keys(), runningTop.hours[hour].lockedGetDomains, domains)
|
||||
do(runningTop.hours[hour].blocked.Keys(), runningTop.hours[hour].lockedGetBlocked, blocked)
|
||||
do(runningTop.hours[hour].clients.Keys(), runningTop.hours[hour].lockedGetClients, clients)
|
||||
runningTop.hours[hour].RUnlock()
|
||||
}
|
||||
runningTop.hoursReadUnlock()
|
||||
|
||||
// use manual json marshalling because we want maps to be sorted by value
|
||||
json := bytes.Buffer{}
|
||||
json.WriteString("{\n")
|
||||
|
||||
gen := func(json *bytes.Buffer, name string, top map[string]int, addComma bool) {
|
||||
json.WriteString(" ")
|
||||
json.WriteString(fmt.Sprintf("%q", name))
|
||||
json.WriteString(": {\n")
|
||||
sorted := sortByValue(top)
|
||||
// no more than 50 entries
|
||||
if len(sorted) > 50 {
|
||||
sorted = sorted[:50]
|
||||
}
|
||||
for i, key := range sorted {
|
||||
json.WriteString(" ")
|
||||
json.WriteString(fmt.Sprintf("%q", key))
|
||||
json.WriteString(": ")
|
||||
json.WriteString(strconv.Itoa(top[key]))
|
||||
if i+1 != len(sorted) {
|
||||
json.WriteByte(',')
|
||||
}
|
||||
json.WriteByte('\n')
|
||||
}
|
||||
json.WriteString(" }")
|
||||
if addComma {
|
||||
json.WriteByte(',')
|
||||
}
|
||||
json.WriteByte('\n')
|
||||
}
|
||||
gen(&json, "top_queried_domains", domains, true)
|
||||
gen(&json, "top_blocked_domains", blocked, true)
|
||||
gen(&json, "top_clients", clients, true)
|
||||
json.WriteString(" \"stats_period\": \"24 hours\"\n")
|
||||
json.WriteString("}\n")
|
||||
|
||||
w.Header().Set("Content-Type", "application/json")
|
||||
_, err := w.Write(json.Bytes())
|
||||
if err != nil {
|
||||
errortext := fmt.Sprintf("Couldn't write body: %s", err)
|
||||
log.Println(errortext)
|
||||
http.Error(w, errortext, http.StatusInternalServerError)
|
||||
}
|
||||
}
|
||||
|
||||
// helper function for querylog API
|
||||
func sortByValue(m map[string]int) []string {
|
||||
type kv struct {
|
||||
k string
|
||||
v int
|
||||
}
|
||||
var ss []kv
|
||||
for k, v := range m {
|
||||
ss = append(ss, kv{k, v})
|
||||
}
|
||||
sort.Slice(ss, func(l, r int) bool {
|
||||
return ss[l].v > ss[r].v
|
||||
})
|
||||
|
||||
sorted := []string{}
|
||||
for _, v := range ss {
|
||||
sorted = append(sorted, v.k)
|
||||
}
|
||||
return sorted
|
||||
}
|
||||
|
||||
func (d *dayTop) hoursWriteLock() { tracelock(); d.hoursLock.Lock() }
|
||||
func (d *dayTop) hoursWriteUnlock() { tracelock(); d.hoursLock.Unlock() }
|
||||
func (d *dayTop) hoursReadLock() { tracelock(); d.hoursLock.RLock() }
|
||||
func (d *dayTop) hoursReadUnlock() { tracelock(); d.hoursLock.RUnlock() }
|
||||
func (d *dayTop) loadedWriteLock() { tracelock(); d.loadedLock.Lock() }
|
||||
func (d *dayTop) loadedWriteUnlock() { tracelock(); d.loadedLock.Unlock() }
|
||||
|
||||
func (h *hourTop) Lock() { tracelock(); h.mutex.Lock() }
|
||||
func (h *hourTop) RLock() { tracelock(); h.mutex.RLock() }
|
||||
func (h *hourTop) RUnlock() { tracelock(); h.mutex.RUnlock() }
|
||||
func (h *hourTop) Unlock() { tracelock(); h.mutex.Unlock() }
|
||||
|
||||
func tracelock() {
|
||||
if false { // not commented out to make code checked during compilation
|
||||
pc := make([]uintptr, 10) // at least 1 entry needed
|
||||
runtime.Callers(2, pc)
|
||||
f := path.Base(runtime.FuncForPC(pc[1]).Name())
|
||||
lockf := path.Base(runtime.FuncForPC(pc[0]).Name())
|
||||
fmt.Fprintf(os.Stderr, "%s(): %s\n", f, lockf)
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,398 @@
|
|||
package dnsforward
|
||||
|
||||
import (
|
||||
"encoding/json"
|
||||
"fmt"
|
||||
"log"
|
||||
"net/http"
|
||||
"sync"
|
||||
"time"
|
||||
|
||||
"github.com/AdguardTeam/AdGuardHome/dnsfilter"
|
||||
)
|
||||
|
||||
var (
|
||||
requests = newDNSCounter("requests_total")
|
||||
filtered = newDNSCounter("filtered_total")
|
||||
filteredLists = newDNSCounter("filtered_lists_total")
|
||||
filteredSafebrowsing = newDNSCounter("filtered_safebrowsing_total")
|
||||
filteredParental = newDNSCounter("filtered_parental_total")
|
||||
filteredInvalid = newDNSCounter("filtered_invalid_total")
|
||||
whitelisted = newDNSCounter("whitelisted_total")
|
||||
safesearch = newDNSCounter("safesearch_total")
|
||||
errorsTotal = newDNSCounter("errors_total")
|
||||
elapsedTime = newDNSHistogram("request_duration")
|
||||
)
|
||||
|
||||
// entries for single time period (for example all per-second entries)
|
||||
type statsEntries map[string][statsHistoryElements]float64
|
||||
|
||||
// how far back to keep the stats
|
||||
const statsHistoryElements = 60 + 1 // +1 for calculating delta
|
||||
|
||||
// each periodic stat is a map of arrays
|
||||
type periodicStats struct {
|
||||
Entries statsEntries
|
||||
period time.Duration // how long one entry lasts
|
||||
LastRotate time.Time // last time this data was rotated
|
||||
|
||||
sync.RWMutex
|
||||
}
|
||||
|
||||
type stats struct {
|
||||
PerSecond periodicStats
|
||||
PerMinute periodicStats
|
||||
PerHour periodicStats
|
||||
PerDay periodicStats
|
||||
}
|
||||
|
||||
// per-second/per-minute/per-hour/per-day stats
|
||||
var statistics stats
|
||||
|
||||
func initPeriodicStats(periodic *periodicStats, period time.Duration) {
|
||||
periodic.Entries = statsEntries{}
|
||||
periodic.LastRotate = time.Now()
|
||||
periodic.period = period
|
||||
}
|
||||
|
||||
func init() {
|
||||
purgeStats()
|
||||
}
|
||||
|
||||
func purgeStats() {
|
||||
initPeriodicStats(&statistics.PerSecond, time.Second)
|
||||
initPeriodicStats(&statistics.PerMinute, time.Minute)
|
||||
initPeriodicStats(&statistics.PerHour, time.Hour)
|
||||
initPeriodicStats(&statistics.PerDay, time.Hour*24)
|
||||
}
|
||||
|
||||
func (p *periodicStats) Inc(name string, when time.Time) {
|
||||
// calculate how many periods ago this happened
|
||||
elapsed := int64(time.Since(when) / p.period)
|
||||
// trace("%s: %v as %v -> [%v]", name, time.Since(when), p.period, elapsed)
|
||||
if elapsed >= statsHistoryElements {
|
||||
return // outside of our timeframe
|
||||
}
|
||||
p.Lock()
|
||||
currentValues := p.Entries[name]
|
||||
currentValues[elapsed]++
|
||||
p.Entries[name] = currentValues
|
||||
p.Unlock()
|
||||
}
|
||||
|
||||
func (p *periodicStats) Observe(name string, when time.Time, value float64) {
|
||||
// calculate how many periods ago this happened
|
||||
elapsed := int64(time.Since(when) / p.period)
|
||||
// trace("%s: %v as %v -> [%v]", name, time.Since(when), p.period, elapsed)
|
||||
if elapsed >= statsHistoryElements {
|
||||
return // outside of our timeframe
|
||||
}
|
||||
p.Lock()
|
||||
{
|
||||
countname := name + "_count"
|
||||
currentValues := p.Entries[countname]
|
||||
value := currentValues[elapsed]
|
||||
// trace("Will change p.Entries[%s][%d] from %v to %v", countname, elapsed, value, value+1)
|
||||
value += 1
|
||||
currentValues[elapsed] = value
|
||||
p.Entries[countname] = currentValues
|
||||
}
|
||||
{
|
||||
totalname := name + "_sum"
|
||||
currentValues := p.Entries[totalname]
|
||||
currentValues[elapsed] += value
|
||||
p.Entries[totalname] = currentValues
|
||||
}
|
||||
p.Unlock()
|
||||
}
|
||||
|
||||
func (p *periodicStats) statsRotate(now time.Time) {
|
||||
p.Lock()
|
||||
rotations := int64(now.Sub(p.LastRotate) / p.period)
|
||||
if rotations > statsHistoryElements {
|
||||
rotations = statsHistoryElements
|
||||
}
|
||||
// calculate how many times we should rotate
|
||||
for r := int64(0); r < rotations; r++ {
|
||||
for key, values := range p.Entries {
|
||||
newValues := [statsHistoryElements]float64{}
|
||||
for i := 1; i < len(values); i++ {
|
||||
newValues[i] = values[i-1]
|
||||
}
|
||||
p.Entries[key] = newValues
|
||||
}
|
||||
}
|
||||
if rotations > 0 {
|
||||
p.LastRotate = now
|
||||
}
|
||||
p.Unlock()
|
||||
}
|
||||
|
||||
func statsRotator() {
|
||||
for range time.Tick(time.Second) {
|
||||
now := time.Now()
|
||||
statistics.PerSecond.statsRotate(now)
|
||||
statistics.PerMinute.statsRotate(now)
|
||||
statistics.PerHour.statsRotate(now)
|
||||
statistics.PerDay.statsRotate(now)
|
||||
}
|
||||
}
|
||||
|
||||
// counter that wraps around prometheus Counter but also adds to periodic stats
|
||||
type counter struct {
|
||||
name string // used as key in periodic stats
|
||||
value int64
|
||||
}
|
||||
|
||||
func newDNSCounter(name string) *counter {
|
||||
// trace("called")
|
||||
return &counter{
|
||||
name: name,
|
||||
}
|
||||
}
|
||||
|
||||
func (c *counter) IncWithTime(when time.Time) {
|
||||
statistics.PerSecond.Inc(c.name, when)
|
||||
statistics.PerMinute.Inc(c.name, when)
|
||||
statistics.PerHour.Inc(c.name, when)
|
||||
statistics.PerDay.Inc(c.name, when)
|
||||
c.value++
|
||||
}
|
||||
|
||||
func (c *counter) Inc() {
|
||||
c.IncWithTime(time.Now())
|
||||
}
|
||||
|
||||
type histogram struct {
|
||||
name string // used as key in periodic stats
|
||||
count int64
|
||||
total float64
|
||||
}
|
||||
|
||||
func newDNSHistogram(name string) *histogram {
|
||||
return &histogram{
|
||||
name: name,
|
||||
}
|
||||
}
|
||||
|
||||
func (h *histogram) ObserveWithTime(value float64, when time.Time) {
|
||||
statistics.PerSecond.Observe(h.name, when, value)
|
||||
statistics.PerMinute.Observe(h.name, when, value)
|
||||
statistics.PerHour.Observe(h.name, when, value)
|
||||
statistics.PerDay.Observe(h.name, when, value)
|
||||
h.count++
|
||||
h.total += value
|
||||
}
|
||||
|
||||
func (h *histogram) Observe(value float64) {
|
||||
h.ObserveWithTime(value, time.Now())
|
||||
}
|
||||
|
||||
// -----
|
||||
// stats
|
||||
// -----
|
||||
func incrementCounters(entry *logEntry) {
|
||||
requests.IncWithTime(entry.Time)
|
||||
if entry.Result.IsFiltered {
|
||||
filtered.IncWithTime(entry.Time)
|
||||
}
|
||||
switch entry.Result.Reason {
|
||||
case dnsfilter.NotFilteredWhiteList:
|
||||
whitelisted.IncWithTime(entry.Time)
|
||||
case dnsfilter.NotFilteredError:
|
||||
errorsTotal.IncWithTime(entry.Time)
|
||||
case dnsfilter.FilteredBlackList:
|
||||
filteredLists.IncWithTime(entry.Time)
|
||||
case dnsfilter.FilteredSafeBrowsing:
|
||||
filteredSafebrowsing.IncWithTime(entry.Time)
|
||||
case dnsfilter.FilteredParental:
|
||||
filteredParental.IncWithTime(entry.Time)
|
||||
case dnsfilter.FilteredInvalid:
|
||||
// do nothing
|
||||
case dnsfilter.FilteredSafeSearch:
|
||||
safesearch.IncWithTime(entry.Time)
|
||||
}
|
||||
elapsedTime.ObserveWithTime(entry.Elapsed.Seconds(), entry.Time)
|
||||
}
|
||||
|
||||
func HandleStats(w http.ResponseWriter, r *http.Request) {
|
||||
const numHours = 24
|
||||
histrical := generateMapFromStats(&statistics.PerHour, 0, numHours)
|
||||
// sum them up
|
||||
summed := map[string]interface{}{}
|
||||
for key, values := range histrical {
|
||||
summedValue := 0.0
|
||||
floats, ok := values.([]float64)
|
||||
if !ok {
|
||||
continue
|
||||
}
|
||||
for _, v := range floats {
|
||||
summedValue += v
|
||||
}
|
||||
summed[key] = summedValue
|
||||
}
|
||||
// don't forget to divide by number of elements in returned slice
|
||||
if val, ok := summed["avg_processing_time"]; ok {
|
||||
if flval, flok := val.(float64); flok {
|
||||
flval /= numHours
|
||||
summed["avg_processing_time"] = flval
|
||||
}
|
||||
}
|
||||
|
||||
summed["stats_period"] = "24 hours"
|
||||
|
||||
json, err := json.Marshal(summed)
|
||||
if err != nil {
|
||||
errortext := fmt.Sprintf("Unable to marshal status json: %s", err)
|
||||
log.Println(errortext)
|
||||
http.Error(w, errortext, 500)
|
||||
return
|
||||
}
|
||||
w.Header().Set("Content-Type", "application/json")
|
||||
_, err = w.Write(json)
|
||||
if err != nil {
|
||||
errortext := fmt.Sprintf("Unable to write response json: %s", err)
|
||||
log.Println(errortext)
|
||||
http.Error(w, errortext, 500)
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
func generateMapFromStats(stats *periodicStats, start int, end int) map[string]interface{} {
|
||||
// clamp
|
||||
start = clamp(start, 0, statsHistoryElements)
|
||||
end = clamp(end, 0, statsHistoryElements)
|
||||
|
||||
avgProcessingTime := make([]float64, 0)
|
||||
|
||||
count := getReversedSlice(stats.Entries[elapsedTime.name+"_count"], start, end)
|
||||
sum := getReversedSlice(stats.Entries[elapsedTime.name+"_sum"], start, end)
|
||||
for i := 0; i < len(count); i++ {
|
||||
var avg float64
|
||||
if count[i] != 0 {
|
||||
avg = sum[i] / count[i]
|
||||
avg *= 1000
|
||||
}
|
||||
avgProcessingTime = append(avgProcessingTime, avg)
|
||||
}
|
||||
|
||||
result := map[string]interface{}{
|
||||
"dns_queries": getReversedSlice(stats.Entries[requests.name], start, end),
|
||||
"blocked_filtering": getReversedSlice(stats.Entries[filtered.name], start, end),
|
||||
"replaced_safebrowsing": getReversedSlice(stats.Entries[filteredSafebrowsing.name], start, end),
|
||||
"replaced_safesearch": getReversedSlice(stats.Entries[safesearch.name], start, end),
|
||||
"replaced_parental": getReversedSlice(stats.Entries[filteredParental.name], start, end),
|
||||
"avg_processing_time": avgProcessingTime,
|
||||
}
|
||||
return result
|
||||
}
|
||||
|
||||
func HandleStatsHistory(w http.ResponseWriter, r *http.Request) {
|
||||
// handle time unit and prepare our time window size
|
||||
now := time.Now()
|
||||
timeUnitString := r.URL.Query().Get("time_unit")
|
||||
var stats *periodicStats
|
||||
var timeUnit time.Duration
|
||||
switch timeUnitString {
|
||||
case "seconds":
|
||||
timeUnit = time.Second
|
||||
stats = &statistics.PerSecond
|
||||
case "minutes":
|
||||
timeUnit = time.Minute
|
||||
stats = &statistics.PerMinute
|
||||
case "hours":
|
||||
timeUnit = time.Hour
|
||||
stats = &statistics.PerHour
|
||||
case "days":
|
||||
timeUnit = time.Hour * 24
|
||||
stats = &statistics.PerDay
|
||||
default:
|
||||
http.Error(w, "Must specify valid time_unit parameter", 400)
|
||||
return
|
||||
}
|
||||
|
||||
// parse start and end time
|
||||
startTime, err := time.Parse(time.RFC3339, r.URL.Query().Get("start_time"))
|
||||
if err != nil {
|
||||
errortext := fmt.Sprintf("Must specify valid start_time parameter: %s", err)
|
||||
log.Println(errortext)
|
||||
http.Error(w, errortext, 400)
|
||||
return
|
||||
}
|
||||
endTime, err := time.Parse(time.RFC3339, r.URL.Query().Get("end_time"))
|
||||
if err != nil {
|
||||
errortext := fmt.Sprintf("Must specify valid end_time parameter: %s", err)
|
||||
log.Println(errortext)
|
||||
http.Error(w, errortext, 400)
|
||||
return
|
||||
}
|
||||
|
||||
// check if start and time times are within supported time range
|
||||
timeRange := timeUnit * statsHistoryElements
|
||||
if startTime.Add(timeRange).Before(now) {
|
||||
http.Error(w, "start_time parameter is outside of supported range", 501)
|
||||
return
|
||||
}
|
||||
if endTime.Add(timeRange).Before(now) {
|
||||
http.Error(w, "end_time parameter is outside of supported range", 501)
|
||||
return
|
||||
}
|
||||
|
||||
// calculate start and end of our array
|
||||
// basically it's how many hours/minutes/etc have passed since now
|
||||
start := int(now.Sub(endTime) / timeUnit)
|
||||
end := int(now.Sub(startTime) / timeUnit)
|
||||
|
||||
// swap them around if they're inverted
|
||||
if start > end {
|
||||
start, end = end, start
|
||||
}
|
||||
|
||||
data := generateMapFromStats(stats, start, end)
|
||||
json, err := json.Marshal(data)
|
||||
if err != nil {
|
||||
errortext := fmt.Sprintf("Unable to marshal status json: %s", err)
|
||||
log.Println(errortext)
|
||||
http.Error(w, errortext, 500)
|
||||
return
|
||||
}
|
||||
w.Header().Set("Content-Type", "application/json")
|
||||
_, err = w.Write(json)
|
||||
if err != nil {
|
||||
errortext := fmt.Sprintf("Unable to write response json: %s", err)
|
||||
log.Println(errortext)
|
||||
http.Error(w, errortext, 500)
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
func HandleStatsReset(w http.ResponseWriter, r *http.Request) {
|
||||
purgeStats()
|
||||
_, err := fmt.Fprintf(w, "OK\n")
|
||||
if err != nil {
|
||||
errortext := fmt.Sprintf("Couldn't write body: %s", err)
|
||||
log.Println(errortext)
|
||||
http.Error(w, errortext, http.StatusInternalServerError)
|
||||
}
|
||||
}
|
||||
|
||||
func clamp(value, low, high int) int {
|
||||
if value < low {
|
||||
return low
|
||||
}
|
||||
if value > high {
|
||||
return high
|
||||
}
|
||||
return value
|
||||
}
|
||||
|
||||
// --------------------------
|
||||
// helper functions for stats
|
||||
// --------------------------
|
||||
func getReversedSlice(input [statsHistoryElements]float64, start int, end int) []float64 {
|
||||
output := make([]float64, 0)
|
||||
for i := start; i <= end; i++ {
|
||||
output = append([]float64{input[i]}, output...)
|
||||
}
|
||||
return output
|
||||
}
|
||||
Loading…
Reference in New Issue