gosora/common/poll_store.go

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package common
import (
"database/sql"
"encoding/json"
"errors"
"log"
"strconv"
"../query_gen/lib"
)
var Polls PollStore
type Poll struct {
ID int
ParentID int
ParentTable string
Type int // 0: Single choice, 1: Multiple choice, 2: Multiple choice w/ points
//AntiCheat bool // Apply various mitigations for cheating
// GroupPower map[gid]points // The number of points a group can spend in this poll, defaults to 1
Options map[int]string
Results map[int]int // map[optionIndex]points
QuickOptions []PollOption // TODO: Fix up the template transpiler so we don't need to use this hack anymore
VoteCount int
}
func (poll *Poll) CastVote(optionIndex int, uid int, ipaddress string) error {
return Polls.CastVote(optionIndex, poll.ID, uid, ipaddress) // TODO: Move the query into a pollStmts rather than having it in the store
}
func (poll *Poll) Copy() Poll {
return *poll
}
type PollOption struct {
ID int
Value string
}
type Pollable interface {
GetID() int
GetTable() string
SetPoll(pollID int) error
}
type PollStore interface {
Get(id int) (*Poll, error)
Exists(id int) bool
Create(parent Pollable, pollType int, pollOptions map[int]string) (int, error)
CastVote(optionIndex int, pollID int, uid int, ipaddress string) error
Reload(id int) error
//GlobalCount() int
SetCache(cache PollCache)
GetCache() PollCache
}
type DefaultPollStore struct {
cache PollCache
get *sql.Stmt
exists *sql.Stmt
createPoll *sql.Stmt
createPollOption *sql.Stmt
addVote *sql.Stmt
incrementVoteCount *sql.Stmt
incrementVoteCountForOption *sql.Stmt
delete *sql.Stmt
//pollCount *sql.Stmt
}
func NewDefaultPollStore(cache PollCache) (*DefaultPollStore, error) {
acc := qgen.NewAcc()
if cache == nil {
cache = NewNullPollCache()
}
// TODO: Add an admin version of registerStmt with more flexibility?
return &DefaultPollStore{
cache: cache,
get: acc.Select("polls").Columns("parentID, parentTable, type, options, votes").Where("pollID = ?").Prepare(),
exists: acc.Select("polls").Columns("pollID").Where("pollID = ?").Prepare(),
createPoll: acc.Insert("polls").Columns("parentID, parentTable, type, options").Fields("?,?,?,?").Prepare(),
createPollOption: acc.Insert("polls_options").Columns("pollID, option, votes").Fields("?,?,0").Prepare(),
addVote: acc.Insert("polls_votes").Columns("pollID, uid, option, castAt, ipaddress").Fields("?,?,?,UTC_TIMESTAMP(),?").Prepare(),
incrementVoteCount: acc.Update("polls").Set("votes = votes + 1").Where("pollID = ?").Prepare(),
incrementVoteCountForOption: acc.Update("polls_options").Set("votes = votes + 1").Where("option = ? AND pollID = ?").Prepare(),
//pollCount: acc.SimpleCount("polls", "", ""),
}, acc.FirstError()
}
func (store *DefaultPollStore) Exists(id int) bool {
err := store.exists.QueryRow(id).Scan(&id)
if err != nil && err != ErrNoRows {
LogError(err)
}
return err != ErrNoRows
}
func (store *DefaultPollStore) Get(id int) (*Poll, error) {
poll, err := store.cache.Get(id)
if err == nil {
return poll, nil
}
poll = &Poll{ID: id}
var optionTxt []byte
err = store.get.QueryRow(id).Scan(&poll.ParentID, &poll.ParentTable, &poll.Type, &optionTxt, &poll.VoteCount)
if err != nil {
return nil, err
}
err = json.Unmarshal(optionTxt, &poll.Options)
if err == nil {
poll.QuickOptions = store.unpackOptionsMap(poll.Options)
store.cache.Set(poll)
}
return poll, err
}
// TODO: Optimise the query to avoid preparing it on the spot? Maybe, use knowledge of the most common IN() parameter counts?
// TODO: ID of 0 should always error?
func (store *DefaultPollStore) BulkGetMap(ids []int) (list map[int]*Poll, err error) {
var idCount = len(ids)
list = make(map[int]*Poll)
if idCount == 0 {
return list, nil
}
var stillHere []int
sliceList := store.cache.BulkGet(ids)
for i, sliceItem := range sliceList {
if sliceItem != nil {
list[sliceItem.ID] = sliceItem
} else {
stillHere = append(stillHere, ids[i])
}
}
ids = stillHere
// If every user is in the cache, then return immediately
if len(ids) == 0 {
return list, nil
}
// TODO: Add a function for the qlist stuff
var qlist string
var pollIDList []interface{}
for _, id := range ids {
pollIDList = append(pollIDList, strconv.Itoa(id))
qlist += "?,"
}
qlist = qlist[0 : len(qlist)-1]
rows, err := qgen.NewAcc().Select("polls").Columns("pollID, parentID, parentTable, type, options, votes").Where("pollID IN(" + qlist + ")").Query(pollIDList...)
if err != nil {
return list, err
}
for rows.Next() {
poll := &Poll{ID: 0}
var optionTxt []byte
err := rows.Scan(&poll.ID, &poll.ParentID, &poll.ParentTable, &poll.Type, &optionTxt, &poll.VoteCount)
if err != nil {
return list, err
}
err = json.Unmarshal(optionTxt, &poll.Options)
if err != nil {
return list, err
}
poll.QuickOptions = store.unpackOptionsMap(poll.Options)
store.cache.Set(poll)
list[poll.ID] = poll
}
// Did we miss any polls?
if idCount > len(list) {
var sidList string
for _, id := range ids {
_, ok := list[id]
if !ok {
sidList += strconv.Itoa(id) + ","
}
}
// We probably don't need this, but it might be useful in case of bugs in BulkCascadeGetMap
if sidList == "" {
// TODO: Bulk log this
if Dev.DebugMode {
log.Print("This data is sampled later in the BulkCascadeGetMap function, so it might miss the cached IDs")
log.Print("idCount", idCount)
log.Print("ids", ids)
log.Print("list", list)
}
return list, errors.New("We weren't able to find a poll, but we don't know which one")
}
sidList = sidList[0 : len(sidList)-1]
err = errors.New("Unable to find the polls with the following IDs: " + sidList)
}
return list, err
}
func (store *DefaultPollStore) Reload(id int) error {
poll := &Poll{ID: id}
var optionTxt []byte
err := store.get.QueryRow(id).Scan(&poll.ParentID, &poll.ParentTable, &poll.Type, &optionTxt, &poll.VoteCount)
if err != nil {
store.cache.Remove(id)
return err
}
err = json.Unmarshal(optionTxt, &poll.Options)
if err != nil {
store.cache.Remove(id)
return err
}
poll.QuickOptions = store.unpackOptionsMap(poll.Options)
_ = store.cache.Set(poll)
return nil
}
func (store *DefaultPollStore) unpackOptionsMap(rawOptions map[int]string) []PollOption {
options := make([]PollOption, len(rawOptions))
for id, option := range rawOptions {
options[id] = PollOption{id, option}
}
return options
}
// TODO: Use a transaction for this?
func (store *DefaultPollStore) CastVote(optionIndex int, pollID int, uid int, ipaddress string) error {
_, err := store.addVote.Exec(pollID, uid, optionIndex, ipaddress)
if err != nil {
return err
}
_, err = store.incrementVoteCount.Exec(pollID)
if err != nil {
return err
}
_, err = store.incrementVoteCountForOption.Exec(optionIndex, pollID)
return err
}
// TODO: Use a transaction for this
func (store *DefaultPollStore) Create(parent Pollable, pollType int, pollOptions map[int]string) (id int, err error) {
pollOptionsTxt, err := json.Marshal(pollOptions)
if err != nil {
return 0, err
}
res, err := store.createPoll.Exec(parent.GetID(), parent.GetTable(), pollType, pollOptionsTxt)
if err != nil {
return 0, err
}
lastID, err := res.LastInsertId()
if err != nil {
return 0, err
}
for i := 0; i < len(pollOptions); i++ {
_, err := store.createPollOption.Exec(lastID, i)
if err != nil {
return 0, err
}
}
return int(lastID), parent.SetPoll(int(lastID)) // TODO: Delete the poll (and options) if SetPoll fails
}
func (store *DefaultPollStore) SetCache(cache PollCache) {
store.cache = cache
}
// TODO: We're temporarily doing this so that you can do ucache != nil in getTopicUser. Refactor it.
func (store *DefaultPollStore) GetCache() PollCache {
_, ok := store.cache.(*NullPollCache)
if ok {
return nil
}
return store.cache
}