Skip to content

Instantly share code, notes, and snippets.

@345161974
Forked from ardan-bkennedy/GoMgoSample-1.go
Created June 12, 2017 06:27
  • Star 24 You must be signed in to star a gist
  • Fork 17 You must be signed in to fork a gist
Star You must be signed in to star a gist
Save 345161974/4f2048f90584a64891cf07997bfd9e23 to your computer and use it in GitHub Desktop.
Sample Go and MGO example
type (
// BuoyCondition contains information for an individual station.
BuoyCondition struct {
WindSpeed float64 `bson:"wind_speed_milehour"`
WindDirection int `bson:"wind_direction_degnorth"`
WindGust float64 `bson:"gust_wind_speed_milehour"`
}
// BuoyLocation contains the buoy's location.
BuoyLocation struct {
Type string `bson:"type"`
Coordinates []float64 `bson:"coordinates"`
}
// BuoyStation contains information for an individual station.
BuoyStation struct {
ID bson.ObjectId `bson:"_id,omitempty"`
StationId string `bson:"station_id"`
Name string `bson:"name"`
LocDesc string `bson:"location_desc"`
Condition BuoyCondition `bson:"condition"`
Location BuoyLocation `bson:"location"`
}
)
// We need this object to establish a session to our MongoDB.
mongoDBDialInfo := &mgo.DialInfo{
Addrs: []string{MongoDBHosts},
Timeout: 60 * time.Second,
Database: AuthDatabase,
Username: AuthUserName,
Password: AuthPassword,
}
// Create a session which maintains a pool of socket connections
// to our MongoDB.
mongoSession, err := mgo.DialWithInfo(mongoDBDialInfo)
if err != nil {
log.Fatalf("CreateSession: %s\n", err)
}
// 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.SetMode(mgo.Monotonic, true)
// Create a wait group to manage the goroutines.
var waitGroup sync.WaitGroup
// Perform 10 concurrent queries against the database.
waitGroup.Add(10)
for query := 0; query < 10; query++ {
go RunQuery(query, &waitGroup, mongoSession)
}
// Wait for all the queries to complete.
waitGroup.Wait()
log.Println("All Queries Completed")
// Decrement the wait group count so the program knows this
// has been completed once the goroutine exits.
defer waitGroup.Done()
// Request a socket connection from the session to process our query.
// Close the session when the goroutine exits and put the connection back
// into the pool.
sessionCopy := mongoSession.Copy()
defer sessionCopy.Close()
// Get a collection to execute the query against.
collection := sessionCopy.DB(TestDatabase).C("buoy_stations")
log.Printf("RunQuery : %d : Executing\n", query)
// Retrieve the list of stations.
var buoyStations []BuoyStation
err := collection.Find(nil).All(&buoyStations)
if err != nil {
log.Printf("RunQuery : ERROR : %s\n", err)
return
}
log.Printf("RunQuery : %d : Count[%d]\n", query, len(buoyStations))
// This program provides a sample application for using MongoDB with
// the mgo driver.
package main
import (
"labix.org/v2/mgo"
"labix.org/v2/mgo/bson"
"log"
"sync"
"time"
)
const (
MongoDBHosts = "ds035428.mongolab.com:35428"
AuthDatabase = "goinggo"
AuthUserName = "guest"
AuthPassword = "welcome"
TestDatabase = "goinggo"
)
type (
// BuoyCondition contains information for an individual station.
BuoyCondition struct {
WindSpeed float64 `bson:"wind_speed_milehour"`
WindDirection int `bson:"wind_direction_degnorth"`
WindGust float64 `bson:"gust_wind_speed_milehour"`
}
// BuoyLocation contains the buoy's location.
BuoyLocation struct {
Type string `bson:"type"`
Coordinates []float64 `bson:"coordinates"`
}
// BuoyStation contains information for an individual station.
BuoyStation struct {
ID bson.ObjectId `bson:"_id,omitempty"`
StationId string `bson:"station_id"`
Name string `bson:"name"`
LocDesc string `bson:"location_desc"`
Condition BuoyCondition `bson:"condition"`
Location BuoyLocation `bson:"location"`
}
)
// main is the entry point for the application.
func main() {
// We need this object to establish a session to our MongoDB.
mongoDBDialInfo := &mgo.DialInfo{
Addrs: []string{MongoDBHosts},
Timeout: 60 * time.Second,
Database: AuthDatabase,
Username: AuthUserName,
Password: AuthPassword,
}
// Create a session which maintains a pool of socket connections
// to our MongoDB.
mongoSession, err := mgo.DialWithInfo(mongoDBDialInfo)
if err != nil {
log.Fatalf("CreateSession: %s\n", err)
}
// 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.SetMode(mgo.Monotonic, true)
// Create a wait group to manage the goroutines.
var waitGroup sync.WaitGroup
// Perform 10 concurrent queries against the database.
waitGroup.Add(10)
for query := 0; query < 10; query++ {
go RunQuery(query, &waitGroup, mongoSession)
}
// Wait for all the queries to complete.
waitGroup.Wait()
log.Println("All Queries Completed")
}
// RunQuery is a function that is launched as a goroutine to perform
// the MongoDB work.
func RunQuery(query int, waitGroup *sync.WaitGroup, mongoSession *mgo.Session) {
// Decrement the wait group count so the program knows this
// has been completed once the goroutine exits.
defer waitGroup.Done()
// Request a socket connection from the session to process our query.
// Close the session when the goroutine exits and put the connection back
// into the pool.
sessionCopy := mongoSession.Copy()
defer sessionCopy.Close()
// Get a collection to execute the query against.
collection := sessionCopy.DB(TestDatabase).C("buoy_stations")
log.Printf("RunQuery : %d : Executing\n", query)
// Retrieve the list of stations.
var buoyStations []BuoyStation
err := collection.Find(nil).All(&buoyStations)
if err != nil {
log.Printf("RunQuery : ERROR : %s\n", err)
return
}
log.Printf("RunQuery : %d : Count[%d]\n", query, len(buoyStations))
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment