mirror of https://github.com/perkeep/perkeep.git
133 lines
3.6 KiB
Go
133 lines
3.6 KiB
Go
/*
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Copyright 2011 Google Inc.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package mysqlindexer
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import (
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"fmt"
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"io"
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"os"
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"sync"
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"camli/blobref"
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"camli/blobserver"
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"camli/jsonconfig"
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mysql "camli/third_party/github.com/Philio/GoMySQL"
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)
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type Indexer struct {
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*blobserver.SimpleBlobHubPartitionMap
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Host, User, Password, Database string
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Port int
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// TODO: does this belong at this layer?
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KeyFetcher blobref.StreamingFetcher // for verifying claims
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OwnerBlobRef *blobref.BlobRef
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clientLock sync.Mutex
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cachedClients []*mysql.Client
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}
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func newFromConfig(_ blobserver.Loader, config jsonconfig.Obj) (blobserver.Storage, os.Error) {
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indexer := &Indexer{
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SimpleBlobHubPartitionMap: &blobserver.SimpleBlobHubPartitionMap{},
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Host: config.OptionalString("host", "localhost"),
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User: config.RequiredString("user"),
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Password: config.OptionalString("password", ""),
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Database: config.RequiredString("database"),
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}
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if err := config.Validate(); err != nil {
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return nil, err
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}
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//ownerBlobRef = client.SignerPublicKeyBlobref()
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//if ownerBlobRef == nil {
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// log.Fatalf("Public key not configured.")
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//}
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//KeyFetcher: blobref.NewSerialStreamingFetcher(
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// blobref.NewConfigDirFetcher(),
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// storage),
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//}
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ok, err := indexer.IsAlive()
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if !ok {
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return nil, fmt.Errorf("Failed to connect to MySQL: %v", err)
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}
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return indexer, nil
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}
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func init() {
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blobserver.RegisterStorageConstructor("mysqlindexer", blobserver.StorageConstructor(newFromConfig))
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}
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func (mi *Indexer) IsAlive() (ok bool, err os.Error) {
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var client *mysql.Client
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client, err = mi.getConnection()
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if err != nil {
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return
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}
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defer mi.releaseConnection(client)
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err = client.Query("SELECT 1 + 1")
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if err != nil {
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return
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}
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_, err = client.UseResult()
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if err != nil {
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return
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}
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client.FreeResult()
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return true, nil
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}
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// Get a free cached connection or allocate a new one.
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func (mi *Indexer) getConnection() (client *mysql.Client, err os.Error) {
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mi.clientLock.Lock()
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if len(mi.cachedClients) > 0 {
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defer mi.clientLock.Unlock()
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client = mi.cachedClients[len(mi.cachedClients)-1]
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mi.cachedClients = mi.cachedClients[:len(mi.cachedClients)-1]
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// TODO: Outside the mutex, double check that the client is still good.
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return
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}
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mi.clientLock.Unlock()
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client, err = mysql.DialTCP(mi.Host, mi.User, mi.Password, mi.Database)
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return
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}
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// Release a client to the cached client pool.
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func (mi *Indexer) releaseConnection(client *mysql.Client) {
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mi.clientLock.Lock()
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defer mi.clientLock.Unlock()
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mi.cachedClients = append(mi.cachedClients, client)
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}
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func (mi *Indexer) Fetch(blob *blobref.BlobRef) (blobref.ReadSeekCloser, int64, os.Error) {
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return nil, 0, os.NewError("Fetch isn't supported by the MySQL indexer")
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}
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func (mi *Indexer) FetchStreaming(blob *blobref.BlobRef) (io.ReadCloser, int64, os.Error) {
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return nil, 0, os.NewError("Fetch isn't supported by the MySQL indexer")
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}
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func (mi *Indexer) Remove(blobs []*blobref.BlobRef) os.Error {
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return os.NewError("Remove isn't supported by the MySQL indexer")
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}
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