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index.js
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'use strict';
const _ = require('lodash');
class AwsCompileCloudWatchEventEvents {
constructor(serverless) {
this.serverless = serverless;
this.provider = this.serverless.getProvider('aws');
this.hooks = {
'package:compileEvents': this.compileCloudWatchEventEvents.bind(this),
};
this.serverless.configSchemaHandler.defineFunctionEvent('aws', 'cloudwatchEvent', {
type: 'object',
properties: {
event: { type: 'object' },
input: {
oneOf: [{ type: 'string', maxLength: 8192 }, { type: 'object' }],
},
inputPath: { type: 'string', minLength: 1, maxLength: 256 },
inputTransformer: {
type: 'object',
properties: {
inputPathsMap: {
type: 'object',
additionalProperties: { type: 'string', minLength: 1 },
},
inputTemplate: { type: 'string', minLength: 1, maxLength: 8192 },
},
required: ['inputTemplate'],
additionalProperties: false,
},
description: { type: 'string', maxLength: 512 },
name: { type: 'string', pattern: '[a-zA-Z0-9-_.]+', minLength: 1, maxLength: 64 },
enabled: { type: 'boolean' },
},
additionalProperties: false,
});
}
compileCloudWatchEventEvents() {
this.serverless.service.getAllFunctions().forEach(functionName => {
const functionObj = this.serverless.service.getFunction(functionName);
let cloudWatchEventNumberInFunction = 0;
if (functionObj.events) {
functionObj.events.forEach(event => {
if (event.cloudwatchEvent) {
cloudWatchEventNumberInFunction++;
let State;
let Input;
let InputTransformer;
const EventPattern = JSON.stringify(event.cloudwatchEvent.event);
State = 'ENABLED';
if (event.cloudwatchEvent.enabled === false) {
State = 'DISABLED';
}
const Name = event.cloudwatchEvent.name;
const InputPath = event.cloudwatchEvent.inputPath;
const Description = event.cloudwatchEvent.description;
Input = event.cloudwatchEvent.input;
InputTransformer = event.cloudwatchEvent.inputTransformer;
if ([Input, InputPath, InputTransformer].filter(Boolean).length > 1) {
throw new this.serverless.classes.Error(
[
'You can only set one of input, inputPath, or inputTransformer ',
'properties at the same time for cloudwatch events. ',
'Please check the AWS docs for more info',
].join('')
);
}
if (Input && typeof Input === 'object') {
Input = JSON.stringify(Input);
}
if (Input && typeof Input === 'string') {
// escape quotes to favor JSON.parse
Input = Input.replace(/\"/g, '\\"'); // eslint-disable-line
}
if (InputTransformer) {
InputTransformer = this.formatInputTransformer(InputTransformer);
}
const lambdaLogicalId = this.provider.naming.getLambdaLogicalId(functionName);
const cloudWatchLogicalId = this.provider.naming.getCloudWatchEventLogicalId(
functionName,
cloudWatchEventNumberInFunction
);
const lambdaPermissionLogicalId = this.provider.naming.getLambdaCloudWatchEventPermissionLogicalId(
functionName,
cloudWatchEventNumberInFunction
);
const cloudWatchId = this.provider.naming.getCloudWatchEventId(functionName);
const cloudWatchEventRuleTemplate = `
{
"Type": "AWS::Events::Rule",
"Properties": {
"EventPattern": ${EventPattern.replace(/\\n|\\r/g, '')},
"State": "${State}",
${Description ? `"Description": "${Description}",` : ''}
${Name ? `"Name": "${Name}",` : ''}
"Targets": [{
${Input ? `"Input": "${Input.replace(/\\n|\\r/g, '')}",` : ''}
${InputPath ? `"InputPath": "${InputPath.replace(/\r?\n/g, '')}",` : ''}
${InputTransformer ? `"InputTransformer": ${InputTransformer},` : ''}
"Arn": { "Fn::GetAtt": ["${lambdaLogicalId}", "Arn"] },
"Id": "${cloudWatchId}"
}]
}
}
`;
const permissionTemplate = `
{
"Type": "AWS::Lambda::Permission",
"Properties": {
"FunctionName": { "Fn::GetAtt": ["${lambdaLogicalId}", "Arn"] },
"Action": "lambda:InvokeFunction",
"Principal": "events.amazonaws.com",
"SourceArn": { "Fn::GetAtt": ["${cloudWatchLogicalId}", "Arn"] }
}
}
`;
const newCloudWatchEventRuleObject = {
[cloudWatchLogicalId]: JSON.parse(cloudWatchEventRuleTemplate),
};
const newPermissionObject = {
[lambdaPermissionLogicalId]: JSON.parse(permissionTemplate),
};
_.merge(
this.serverless.service.provider.compiledCloudFormationTemplate.Resources,
newCloudWatchEventRuleObject,
newPermissionObject
);
}
});
}
});
}
formatInputTransformer(inputTransformer) {
const cfmOutput = {
// InputTemplate is required
InputTemplate: inputTransformer.inputTemplate,
};
// InputPathsMap is optional
if (inputTransformer.inputPathsMap) {
cfmOutput.InputPathsMap = inputTransformer.inputPathsMap;
}
return JSON.stringify(cfmOutput);
}
}
module.exports = AwsCompileCloudWatchEventEvents;