gosora/query_gen/install.go

126 lines
3.4 KiB
Go

package qgen
var Install *installer
func init() {
Install = &installer{instructions: []DB_Install_Instruction{}}
}
type DB_Install_Instruction struct {
Table string
Contents string
Type string
}
// TODO: Add methods to this to construct it OO-like
type DB_Install_Table struct {
Name string
Charset string
Collation string
Columns []DBTableColumn
Keys []DBTableKey
}
// A set of wrappers around the generator methods, so we can use this in the installer
// TODO: Re-implement the query generation, query builder and installer adapters as layers on-top of a query text adapter
type installer struct {
adapter Adapter
instructions []DB_Install_Instruction
tables []*DB_Install_Table // TODO: Use this in Record() in the next commit to allow us to auto-migrate settings rather than manually patching them in on upgrade
plugins []QueryPlugin
}
func (install *installer) SetAdapter(name string) error {
adap, err := GetAdapter(name)
if err != nil {
return err
}
install.SetAdapterInstance(adap)
return nil
}
func (install *installer) SetAdapterInstance(adapter Adapter) {
install.adapter = adapter
install.instructions = []DB_Install_Instruction{}
}
func (install *installer) AddPlugins(plugins ...QueryPlugin) {
install.plugins = append(install.plugins, plugins...)
}
func (install *installer) CreateTable(table string, charset string, collation string, columns []DBTableColumn, keys []DBTableKey) error {
tableStruct := &DB_Install_Table{table, charset, collation, columns, keys}
err := install.RunHook("CreateTableStart", tableStruct)
if err != nil {
return err
}
res, err := install.adapter.CreateTable("_installer", table, charset, collation, columns, keys)
if err != nil {
return err
}
err = install.RunHook("CreateTableAfter", tableStruct)
if err != nil {
return err
}
install.instructions = append(install.instructions, DB_Install_Instruction{table, res, "create-table"})
install.tables = append(install.tables, tableStruct)
return nil
}
// TODO: Let plugins manipulate the parameters like in CreateTable
func (install *installer) SimpleInsert(table string, columns string, fields string) error {
err := install.RunHook("SimpleInsertStart", table, columns, fields)
if err != nil {
return err
}
res, err := install.adapter.SimpleInsert("_installer", table, columns, fields)
if err != nil {
return err
}
err = install.RunHook("SimpleInsertAfter", table, columns, fields, res)
if err != nil {
return err
}
install.instructions = append(install.instructions, DB_Install_Instruction{table, res, "insert"})
return nil
}
func (install *installer) RunHook(name string, args ...interface{}) error {
for _, plugin := range install.plugins {
err := plugin.Hook(name, args...)
if err != nil {
return err
}
}
return nil
}
func (install *installer) Write() error {
var inserts string
// We can't escape backticks, so we have to dump it out a file at a time
for _, instr := range install.instructions {
if instr.Type == "create-table" {
err := writeFile("./schema/"+install.adapter.GetName()+"/query_"+instr.Table+".sql", instr.Contents)
if err != nil {
return err
}
} else {
inserts += instr.Contents + ";\n"
}
}
err := writeFile("./schema/"+install.adapter.GetName()+"/inserts.sql", inserts)
if err != nil {
return err
}
for _, plugin := range install.plugins {
err := plugin.Write()
if err != nil {
return err
}
}
return nil
}