// CloseSession puts the connection back into the pool
func CloseSession(sessionId string, mongoSession *mgo.Session) {
defer helper.CatchPanic(nil, sessionId, "CloseSession")
tracelog.STARTED(sessionId, "CloseSession")
mongoSession.Close()
tracelog.COMPLETED(sessionId, "CloseSession")
}
// Shutdown systematically brings the manager down gracefully
func Shutdown(sessionId string) (err error) {
defer helper.CatchPanic(&err, sessionId, "Shutdown")
tracelog.STARTED(sessionId, "Shutdown")
// Close the databases
for _, session := range _This.sessions {
CloseSession(sessionId, session.mongoSession)
}
tracelog.COMPLETED(sessionId, "Shutdown")
return err
}
// 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
}
// Startup brings the manager to a running state
func Startup(sessionId string) (err error) {
defer helper.CatchPanic(&err, sessionId, "Startup")
tracelog.STARTED(sessionId, "Startup")
// Create the Mongo Manager
_This = &mongoManager{
sessions: map[string]*mongoSession{},
}
// Log the mongodb connection straps
tracelog.TRACE(sessionId, "Startup", "MongoDB : Addr[%s]", revel.Config.StringDefault("mgo.host", ""))
tracelog.TRACE(sessionId, "Startup", "MongoDB : Database[%s]", revel.Config.StringDefault("mgo.database", ""))
tracelog.TRACE(sessionId, "Startup", "MongoDB : Username[%s]", revel.Config.StringDefault("mgo.username", ""))
hosts := strings.Split(revel.Config.StringDefault("mgo.host", ""), ",")
// Create the strong and monotonic sessions
err = CreateSession(sessionId, "strong", MASTER_SESSION, hosts, revel.Config.StringDefault("mgo.database", ""), revel.Config.StringDefault("mgo.username", ""), revel.Config.StringDefault("mgo.password", ""))
err = CreateSession(sessionId, "monotonic", MONOTONIC_SESSION, hosts, revel.Config.StringDefault("mgo.database", ""), revel.Config.StringDefault("mgo.username", ""), revel.Config.StringDefault("mgo.password", ""))
tracelog.COMPLETED(sessionId, "Startup")
return err
}
// FindRegion retrieves the stations for the specified region
func FindRegion(service *services.Service, region string) (buoyStations []*buoyModel.BuoyStation, err error) {
defer helper.CatchPanic(&err, service.UserId, "FindRegion")
tracelog.STARTED(service.UserId, "FindRegion")
// Find the specified region
queryMap := bson.M{"region": region}
tracelog.TRACE(helper.MAIN_GO_ROUTINE, "FindRegion", "Query : %s", mongo.ToString(queryMap))
// Capture the specified buoy
buoyStations = []*buoyModel.BuoyStation{}
err = service.DBAction("buoy_stations",
func(collection *mgo.Collection) error {
return collection.Find(queryMap).All(&buoyStations)
})
if err != nil {
tracelog.COMPLETED_ERROR(err, helper.MAIN_GO_ROUTINE, "FindRegion")
return buoyStations, err
}
tracelog.COMPLETED(service.UserId, "FindRegion")
return buoyStations, err
}
// FindStation retrieves the specified station
func FindStation(service *services.Service, stationId string) (buoyStation *buoyModel.BuoyStation, err error) {
defer helper.CatchPanic(&err, service.UserId, "FindStation")
tracelog.STARTED(service.UserId, "FindStation")
// Find the specified station id
queryMap := bson.M{"station_id": stationId}
tracelog.TRACE(helper.MAIN_GO_ROUTINE, "FindStation", "Query : %s", mongo.ToString(queryMap))
// Execute the query
buoyStation = &buoyModel.BuoyStation{}
err = service.DBAction("buoy_stations",
func(collection *mgo.Collection) error {
return collection.Find(queryMap).One(buoyStation)
})
if err != nil {
tracelog.COMPLETED_ERROR(err, helper.MAIN_GO_ROUTINE, "FindStation")
return buoyStation, err
}
tracelog.COMPLETED(service.UserId, "FindStation")
return buoyStation, err
}