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main.go
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main.go
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// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// [START run_events_pubsub_handler]
// Sample run-events-pubsub is a Cloud Run service which handles Pub/Sub messages.
package main
import (
"encoding/json"
"fmt"
"log"
"net/http"
"os"
)
// PubSubMessage is the payload of a Pub/Sub event.
type PubSubMessage struct {
Message struct {
Data []byte `json:"data,omitempty"`
ID string `json:"id"`
} `json:"message"`
Subscription string `json:"subscription"`
}
// HelloEventsPubSub receives and processes a Pub/Sub push message.
func HelloEventsPubSub(w http.ResponseWriter, r *http.Request) {
var e PubSubMessage
if err := json.NewDecoder(r.Body).Decode(&e); err != nil {
http.Error(w, "Bad HTTP Request", http.StatusBadRequest)
log.Printf("Bad HTTP Request: %v", http.StatusBadRequest)
return
}
name := string(e.Message.Data)
if name == "" {
name = "World"
}
s := fmt.Sprintf("Hello, %s! ID: %s", name, string(r.Header.Get("Ce-Id")))
log.Printf(s)
fmt.Fprintln(w, s)
}
func main() {
http.HandleFunc("/", HelloEventsPubSub)
// Determine port for HTTP service.
port := os.Getenv("PORT")
if port == "" {
port = "8080"
log.Printf("Defaulting to port %s", port)
}
// Start HTTP server.
log.Printf("Listening on port %s", port)
if err := http.ListenAndServe(":"+port, nil); err != nil {
log.Fatal(err)
}
}
// [END run_events_pubsub_handler]