dendrite/internal/sqlutil/connection_manager.go

87 lines
2.5 KiB
Go

// Copyright 2023 The Matrix.org Foundation C.I.C.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package sqlutil
import (
"database/sql"
"fmt"
"sync"
"github.com/matrix-org/dendrite/setup/config"
"github.com/matrix-org/dendrite/setup/process"
)
type Connections struct {
globalConfig config.DatabaseOptions
processContext *process.ProcessContext
existingConnections sync.Map
}
type con struct {
db *sql.DB
writer Writer
}
func NewConnectionManager(processCtx *process.ProcessContext, globalConfig config.DatabaseOptions) *Connections {
return &Connections{
globalConfig: globalConfig,
processContext: processCtx,
}
}
func (c *Connections) Connection(dbProperties *config.DatabaseOptions) (*sql.DB, Writer, error) {
var err error
// If no connectionString was provided, try the global one
if dbProperties.ConnectionString == "" {
dbProperties = &c.globalConfig
// If we still don't have a connection string, that's a problem
if dbProperties.ConnectionString == "" {
return nil, nil, fmt.Errorf("no database connections configured")
}
}
writer := NewDummyWriter()
if dbProperties.ConnectionString.IsSQLite() {
writer = NewExclusiveWriter()
}
existing, loaded := c.existingConnections.LoadOrStore(dbProperties.ConnectionString, &con{})
if loaded {
// We found an existing connection
ex := existing.(*con)
return ex.db, ex.writer, nil
}
// Open a new database connection using the supplied config.
db, err := Open(dbProperties, writer)
if err != nil {
return nil, nil, err
}
c.existingConnections.Store(dbProperties.ConnectionString, &con{db: db, writer: writer})
go func() {
if c.processContext == nil {
return
}
// If we have a ProcessContext, start a component and wait for
// Dendrite to shut down to cleanly close the database connection.
c.processContext.ComponentStarted()
<-c.processContext.WaitForShutdown()
_ = db.Close()
c.processContext.ComponentFinished()
}()
return db, writer, nil
}