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index.js
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index.js
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// Copyright 2018 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.
// [START functions_start_instance_pubsub]
// [START functions_stop_instance_pubsub]
const compute = require('@google-cloud/compute');
const instancesClient = new compute.InstancesClient();
const operationsClient = new compute.ZoneOperationsClient();
async function waitForOperation(projectId, operation) {
while (operation.status !== 'DONE') {
[operation] = await operationsClient.wait({
operation: operation.name,
project: projectId,
zone: operation.zone.split('/').pop(),
});
}
}
// [END functions_stop_instance_pubsub]
/**
* Starts Compute Engine instances.
*
* Expects a PubSub message with JSON-formatted event data containing the
* following attributes:
* zone - the GCP zone the instances are located in.
* label - the label of instances to start.
*
* @param {!object} event Cloud Function PubSub message event.
* @param {!object} callback Cloud Function PubSub callback indicating
* completion.
*/
exports.startInstancePubSub = async (event, context, callback) => {
try {
const project = await instancesClient.getProjectId();
const payload = _validatePayload(event);
const options = {
filter: `labels.${payload.label}`,
project,
zone: payload.zone,
};
const [instances] = await instancesClient.list(options);
await Promise.all(
instances.map(async instance => {
const [response] = await instancesClient.start({
project,
zone: payload.zone,
instance: instance.name,
});
return waitForOperation(project, response.latestResponse);
})
);
// Operation complete. Instance successfully started.
const message = 'Successfully started instance(s)';
console.log(message);
callback(null, message);
} catch (err) {
console.log(err);
callback(err);
}
};
// [END functions_start_instance_pubsub]
// [START functions_stop_instance_pubsub]
/**
* Stops Compute Engine instances.
*
* Expects a PubSub message with JSON-formatted event data containing the
* following attributes:
* zone - the GCP zone the instances are located in.
* label - the label of instances to stop.
*
* @param {!object} event Cloud Function PubSub message event.
* @param {!object} callback Cloud Function PubSub callback indicating completion.
*/
exports.stopInstancePubSub = async (event, context, callback) => {
try {
const project = await instancesClient.getProjectId();
const payload = _validatePayload(event);
const options = {
filter: `labels.${payload.label}`,
project,
zone: payload.zone,
};
const [instances] = await instancesClient.list(options);
await Promise.all(
instances.map(async instance => {
const [response] = await instancesClient.stop({
project,
zone: payload.zone,
instance: instance.name,
});
return waitForOperation(project, response.latestResponse);
})
);
// Operation complete. Instance successfully stopped.
const message = 'Successfully stopped instance(s)';
console.log(message);
callback(null, message);
} catch (err) {
console.log(err);
callback(err);
}
};
// [START functions_start_instance_pubsub]
/**
* Validates that a request payload contains the expected fields.
*
* @param {!object} payload the request payload to validate.
* @return {!object} the payload object.
*/
const _validatePayload = event => {
let payload;
try {
payload = JSON.parse(Buffer.from(event.data, 'base64').toString());
} catch (err) {
throw new Error('Invalid Pub/Sub message: ' + err);
}
if (!payload.zone) {
throw new Error("Attribute 'zone' missing from payload");
} else if (!payload.label) {
throw new Error("Attribute 'label' missing from payload");
}
return payload;
};
// [END functions_start_instance_pubsub]
// [END functions_stop_instance_pubsub]