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