// CreateSession creates a connection pool for use
func CreateSession(sessionId string, mode string, sessionName string, hosts []string, databaseName string, username string, password string) (err error) {
defer helper.CatchPanic(nil, sessionId, "CreateSession")
tracelog.STARTEDf(sessionId, "CreateSession", "Mode[%s] SessionName[%s] Hosts[%s] DatabaseName[%s] Username[%s]", mode, sessionName, hosts, databaseName, username)
// Create the database object
mongoSession := &mongoSession{
mongoDBDialInfo: &mgo.DialInfo{
Addrs: hosts,
Timeout: 60 * time.Second,
Database: databaseName,
Username: username,
Password: password,
},
}
// Establish the master session
mongoSession.mongoSession, err = mgo.DialWithInfo(mongoSession.mongoDBDialInfo)
if err != nil {
tracelog.COMPLETED_ERROR(err, sessionId, "CreateSession")
return err
}
switch mode {
case "strong":
// Reads and writes will always be made to the master server using a
// unique connection so that reads and writes are fully consistent,
// ordered, and observing the most up-to-date data.
// http://godoc.org/labix.org/v2/mgo#Session.SetMode
mongoSession.mongoSession.SetMode(mgo.Strong, true)
break
case "monotonic":
// Reads may not be entirely up-to-date, but they will always see the
// history of changes moving forward, the data read will be consistent
// across sequential queries in the same session, and modifications made
// within the session will be observed in following queries (read-your-writes).
// http://godoc.org/labix.org/v2/mgo#Session.SetMode
mongoSession.mongoSession.SetMode(mgo.Monotonic, true)
}
// Have the session check for errors
// http://godoc.org/labix.org/v2/mgo#Session.SetSafe
mongoSession.mongoSession.SetSafe(&mgo.Safe{})
// Add the database to the map
_This.sessions[sessionName] = mongoSession
tracelog.COMPLETED(sessionId, "CreateSession")
return err
}
// CopySession makes a clone of the specified session for client use
func CloneSession(sessionId string, useSession string) (mongoSession *mgo.Session, err error) {
defer helper.CatchPanic(nil, sessionId, "CopySession")
tracelog.STARTEDf(sessionId, "CloneSession", "UseSession[%s]", useSession)
// Find the session object
session := _This.sessions[useSession]
if session == nil {
err = fmt.Errorf("Unable To Locate Session %s", useSession)
tracelog.COMPLETED_ERROR(err, sessionId, "CloneSession")
return mongoSession, err
}
// Clone the master session
mongoSession = session.mongoSession.Clone()
tracelog.COMPLETED(sessionId, "CloneSession")
return mongoSession, err
}
// Execute the MongoDB literal function
func Execute(sessionId string, mongoSession *mgo.Session, databaseName string, collectionName string, mongoCall MongoCall) (err error) {
tracelog.STARTEDf(sessionId, "Execute", "Database[%s] Collection[%s]", databaseName, collectionName)
// Capture the specified collection
collection, err := GetCollection(mongoSession, databaseName, collectionName)
if err != nil {
tracelog.COMPLETED_ERROR(err, sessionId, "Execute")
return err
}
// Execute the mongo call
err = mongoCall(collection)
if err != nil {
tracelog.COMPLETED_ERROR(err, sessionId, "Execute")
return err
}
tracelog.COMPLETED(sessionId, "Execute")
return err
}