// Copyright 2016 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.

'use strict';

// [START functions_log_helloworld]

exports.helloWorld = (req, res) => {

console.log('I am a log entry!');

console.error('I am an error!');

res.end();

};

// [END functions_log_helloworld]

// [START functions_log_retrieve]

// By default, the client will authenticate using the service account file

// specified by the GOOGLE_APPLICATION_CREDENTIALS environment variable and use

// the project specified by the GCLOUD_PROJECT environment variable. See

// https://github.com/googleapis/google-cloud-node/blob/master/docs/authentication.md

const Logging = require('@google-cloud/logging');

const getLogEntries = async () => {

// Instantiates a client

const logging = Logging();

const options = {

pageSize: 10,

filter: 'resource.type="cloud_function"',

};

// Retrieve the latest Cloud Function log entries

// See https://googlecloudplatform.github.io/gcloud-node/#/docs/logging

const [entries] = await logging.getEntries(options);

console.log('Entries:');

entries.forEach(entry => console.log(entry));

return entries;

};

// [END functions_log_retrieve]

// [START functions_log_get_metrics]

// By default, the client will authenticate using the service account file

// specified by the GOOGLE_APPLICATION_CREDENTIALS environment variable and use

// the project specified by the GCLOUD_PROJECT environment variable. See

// https://github.com/googleapis/google-cloud-node/blob/master/docs/authentication.md

const Monitoring = require('@google-cloud/monitoring');

const getMetrics = callback => {

// Instantiates a client

const monitoring = Monitoring.v3().metricServiceApi();

// Create two datestrings, a start and end range

const oneWeekAgo = new Date();

oneWeekAgo.setHours(oneWeekAgo.getHours() - 7 * 24);

const options = {

name: monitoring.projectPath(process.env.GCLOUD_PROJECT),

// There is also: cloudfunctions.googleapis.com/function/execution_count

filter:

'metric.type="cloudfunctions.googleapis.com/function/execution_times"',

interval: {

startTime: {

seconds: oneWeekAgo.getTime() / 1000,

},

endTime: {

seconds: Date.now() / 1000,

},

},

view: 1,

};

console.log('Data:');

let error;

// Iterate over all elements.

monitoring

.listTimeSeries(options)

.on('error', err => {

error = err;

})

.on('data', element => console.log(element))

.on('end', () => callback(error));

// [END functions_log_get_metrics]

};

// [START functions_log_stackdriver]

exports.processLogEntry = data => {

const dataBuffer = Buffer.from(data.data, 'base64');

const logEntry = JSON.parse(dataBuffer.toString('ascii')).protoPayload;

console.log(`Method: ${logEntry.methodName}`);

console.log(`Resource: ${logEntry.resourceName}`);

console.log(`Initiator: ${logEntry.authenticationInfo.principalEmail}`);

};

// [END functions_log_stackdriver]

exports.getLogEntries = getLogEntries;

exports.getMetrics = getMetrics;