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function.go
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function.go
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// Copyright 2021 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
//
// http://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.
// Package function contains test functions to validate the framework.
package function
import (
"context"
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net/http"
"cloud.google.com/go/functions/metadata"
"github.com/GoogleCloudPlatform/functions-framework-go/funcframework"
cloudevents "github.com/cloudevents/sdk-go/v2"
)
const (
outputFile = "function_output.json"
)
// HTTP is a simple HTTP function that writes the request body to the response body.
func HTTP(w http.ResponseWriter, r *http.Request) {
body, err := ioutil.ReadAll(r.Body)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
return
}
if err := ioutil.WriteFile(outputFile, body, 0644); err != nil {
w.WriteHeader(http.StatusInternalServerError)
return
}
}
// Event is a background event function that dumps the data and context to JSON and calls the
// validator script on the result.
func Event(ctx context.Context, data interface{}) error {
m, err := metadata.FromContext(ctx)
if err != nil {
return fmt.Errorf("getting context metadata: %v", err)
}
event := struct {
Data interface{} `json:"data"`
Context *metadata.Metadata `json:"context"`
}{
Data: data,
Context: m,
}
e, err := json.Marshal(event)
if err != nil {
return fmt.Errorf("marshalling event: %v", err)
}
log.Printf("writing %v, %s to file", event, string(e))
return ioutil.WriteFile(outputFile, e, 0644)
}
// CloudEvent is a cloud event function that dumps the event to JSON and calls the validator script
func CloudEvent(ctx context.Context, ce cloudevents.Event) error {
e, err := json.Marshal(ce)
if err != nil {
return fmt.Errorf("marshalling cloud event: %v", err)
}
if err := ioutil.WriteFile(outputFile, e, 0644); err != nil {
return fmt.Errorf("writing file: %v", err)
}
return nil
}
// Register declarative functions
func init() {
fmt.Println("Registering function: declarativeHTTP")
funcframework.HTTP("declarativeHTTP", HTTP)
fmt.Println("Registering function: declarativeCE")
funcframework.CloudEvent("declarativeCE", CloudEvent)
}