@cdklabs/cdk-appflow
Version:
*Note:* this library is currently in technical preview.
84 lines • 11.4 kB
JavaScript
;
/*
Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.handler = handler;
const API = require("./api");
/* eslint-disable no-console */
async function handler(event) {
switch (event.RequestType) {
case "Create":
case "Update":
return updateFlowTime(event);
case "Delete":
return;
default:
throw new Error("Unknown signal");
}
}
async function updateFlowTime(event) {
let expressionString = event.ResourceProperties[API.PROP_SCHEDULE];
const propStartTime = event.ResourceProperties[API.PROP_STARTTIME];
let startTime = propStartTime
? new Date(Date.parse(propStartTime))
: undefined;
const propEndTime = event.ResourceProperties[API.PROP_ENDTIME];
let endTime = propEndTime ? new Date(Date.parse(propEndTime)) : undefined;
if (/^rate/.test(expressionString)) {
({ expressionString, startTime } = buildForRateBasedSchedule(expressionString, startTime));
}
else if (/^cron/.test(expressionString)) {
// do nothing, as we don't change the expressionString
// TODO: do we have to set the startTime? I think we do
}
else {
throw new Error(`Unrecognized expression ${expressionString}`);
}
return {
Data: {
[API.ATTR_SCHEDULE]: expressionString,
[API.ATTR_STARTTIME]: startTime && startTime.getTime() / 1000,
[API.ATTR_ENDTIME]: endTime && endTime.getTime() / 1000,
},
};
}
function buildForRateBasedSchedule(expressionString, startTime) {
// TODO: the below statement is from a customer. I need to check it more thoroughly
// Rebuilding expression string as Flows require always plural, so: hour -> hours, etc.
const matches = /\((\d*)(.*)\)$/.exec(expressionString);
if (!matches) {
throw new Error(`Expression ${expressionString} is not a rate-based expression`);
}
const rate = parseFloat(matches[1]);
let rateUnit = matches[2].trim();
if (!rateUnit.endsWith("s")) {
rateUnit = `${rateUnit}s`;
}
expressionString = `rate(${rate}${rateUnit})`;
if (startTime) {
const nowMillis = Date.now();
const startMillis = startTime.getTime();
if (nowMillis > startMillis) {
let denominator = 1;
switch (rateUnit) {
case "minutes":
denominator = 60 * 1000; // minutes in millis
break;
case "hours":
denominator = 60 * 60 * 1000; // hours in millis
break;
case "days":
denominator = 24 * 60 * 60 * 1000; // days in millis
break;
default:
throw new Error(`Unable to use schedule "${expressionString}"`);
}
const cyclesBetween = Math.ceil((nowMillis - startMillis) / denominator / rate);
startTime = new Date((startMillis / denominator + cyclesBetween * rate) * denominator);
}
}
return { expressionString, startTime };
}
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All Rights Reserved.\nSPDX-License-Identifier: Apache-2.0\n*/\n\n// eslint-disable-next-line import/no-extraneous-dependencies\nimport * as AWSLambda from \"aws-lambda\";\nimport * as API from \"./api\";\n\n/* eslint-disable no-console */\nexport async function handler(\n  event: AWSLambda.CloudFormationCustomResourceEvent,\n) {\n  switch (event.RequestType) {\n    case \"Create\":\n    case \"Update\":\n      return updateFlowTime(event);\n    case \"Delete\":\n      return;\n    default:\n      throw new Error(\"Unknown signal\");\n  }\n}\n\nasync function updateFlowTime(\n  event: AWSLambda.CloudFormationCustomResourceEvent,\n) {\n  let expressionString = event.ResourceProperties[API.PROP_SCHEDULE];\n\n  const propStartTime = event.ResourceProperties[API.PROP_STARTTIME];\n  let startTime = propStartTime\n    ? new Date(Date.parse(propStartTime))\n    : undefined;\n\n  const propEndTime = event.ResourceProperties[API.PROP_ENDTIME];\n  let endTime = propEndTime ? new Date(Date.parse(propEndTime)) : undefined;\n\n  if (/^rate/.test(expressionString)) {\n    ({ expressionString, startTime } = buildForRateBasedSchedule(\n      expressionString,\n      startTime,\n    ));\n  } else if (/^cron/.test(expressionString)) {\n    // do nothing, as we don't change the expressionString\n    // TODO: do we have to set the startTime? I think we do\n  } else {\n    throw new Error(`Unrecognized expression ${expressionString}`);\n  }\n\n  return {\n    Data: {\n      [API.ATTR_SCHEDULE]: expressionString,\n      [API.ATTR_STARTTIME]: startTime && startTime.getTime() / 1000,\n      [API.ATTR_ENDTIME]: endTime && endTime.getTime() / 1000,\n    },\n  };\n}\n\nfunction buildForRateBasedSchedule(expressionString: string, startTime?: Date) {\n  // TODO: the below statement is from a customer. I need to check it more thoroughly\n  // Rebuilding expression string as Flows require always plural, so: hour -> hours, etc.\n  const matches = /\\((\\d*)(.*)\\)$/.exec(expressionString);\n  if (!matches) {\n    throw new Error(\n      `Expression ${expressionString} is not a rate-based expression`,\n    );\n  }\n\n  const rate = parseFloat(matches[1]);\n  let rateUnit = matches[2].trim();\n  if (!rateUnit.endsWith(\"s\")) {\n    rateUnit = `${rateUnit}s`;\n  }\n\n  expressionString = `rate(${rate}${rateUnit})`;\n\n  if (startTime) {\n    const nowMillis = Date.now();\n    const startMillis = startTime.getTime();\n    if (nowMillis > startMillis) {\n      let denominator = 1;\n\n      switch (rateUnit) {\n        case \"minutes\":\n          denominator = 60 * 1000; // minutes in millis\n          break;\n        case \"hours\":\n          denominator = 60 * 60 * 1000; // hours in millis\n          break;\n        case \"days\":\n          denominator = 24 * 60 * 60 * 1000; // days in millis\n          break;\n        default:\n          throw new Error(`Unable to use schedule \"${expressionString}\"`);\n      }\n\n      const cyclesBetween = Math.ceil(\n        (nowMillis - startMillis) / denominator / rate,\n      );\n\n      startTime = new Date(\n        (startMillis / denominator + cyclesBetween * rate) * denominator,\n      );\n    }\n  }\n\n  return { expressionString, startTime };\n}\n"]}