This library can be used to send FCM messages (notifications) to Android and iOS clients which are using Firebase Notification Library.
It is backward compatible with GCM. You can transparently use GCM token instead of FCM token to send Notification to clients which are using old Google Cloud Messaging library.
To install go-fcm, use go get
:
go get github.com/therahulprasad/go-fcm
Import gcm with the following:
import "github.com/therahulprasad/go-fcm"
Here is a quick sample illustrating how to send a message to the GCM server:
package main
import (
"fmt"
"net/http"
"github.com/therahulprasad/go-fcm"
)
func main() {
// Create the message to be sent.
data := map[string]interface{}{"score": "5x1", "time": "15:10"}
regIDs := []string{"4", "8", "15", "16", "23", "42"}
msg := gcm.NewMessage(data, regIDs...)
// Create a Sender to send the message.
sender := &gcm.Sender{ApiKey: "sample_api_key"}
// Send the message and receive the response after at most two retries.
response, err := sender.Send(msg, 2)
if err != nil {
fmt.Println("Failed to send message:", err)
return
}
/* ... */
}
If your application server runs on Google AppEngine, you must import the appengine/urlfetch
package and create the Sender
as follows:
package sample
import (
"appengine"
"appengine/urlfetch"
"github.com/therahulprasad/go-fcm"
)
func handler(w http.ResponseWriter, r *http.Request) {
c := appengine.NewContext(r)
client := urlfetch.Client(c)
sender := &gcm.Sender{ApiKey: "sample_api_key", Http: client}
/* ... */
}