@aws-cdk/aws-logs/lib/log-retention-provider/index.js

"use strict";
/* eslint-disable no-console */
Object.defineProperty(exports, "__esModule", { value: true });
exports.handler = void 0;
// eslint-disable-next-line import/no-extraneous-dependencies
const AWS = require("aws-sdk");
/**
 * Creates a log group and doesn't throw if it exists.
 *
 * @param logGroupName the name of the log group to create.
 * @param region to create the log group in
 * @param options CloudWatch API SDK options.
 */
async function createLogGroupSafe(logGroupName, region, options) {
    var _a;
    // If we set the log retention for a lambda, then due to the async nature of
    // Lambda logging there could be a race condition when the same log group is
    // already being created by the lambda execution. This can sometime result in
    // an error "OperationAbortedException: A conflicting operation is currently
    // in progress...Please try again."
    // To avoid an error, we do as requested and try again.
    let retryCount = (options === null || options === void 0 ? void 0 : options.maxRetries) == undefined ? 10 : options.maxRetries;
    const delay = ((_a = options === null || options === void 0 ? void 0 : options.retryOptions) === null || _a === void 0 ? void 0 : _a.base) == undefined ? 10 : options.retryOptions.base;
    do {
        try {
            const cloudwatchlogs = new AWS.CloudWatchLogs({ apiVersion: '2014-03-28', region, ...options });
            await cloudwatchlogs.createLogGroup({ logGroupName }).promise();
            return;
        }
        catch (error) {
            if (error.code === 'ResourceAlreadyExistsException') {
                // The log group is already created by the lambda execution
                return;
            }
            if (error.code === 'OperationAbortedException') {
                if (retryCount > 0) {
                    retryCount--;
                    await new Promise(resolve => setTimeout(resolve, delay));
                    continue;
                }
                else {
                    // The log group is still being created by another execution but we are out of retries
                    throw new Error('Out of attempts to create a logGroup');
                }
            }
            throw error;
        }
    } while (true); // exit happens on retry count check
}
/**
 * Puts or deletes a retention policy on a log group.
 *
 * @param logGroupName the name of the log group to create
 * @param region the region of the log group
 * @param options CloudWatch API SDK options.
 * @param retentionInDays the number of days to retain the log events in the specified log group.
 */
async function setRetentionPolicy(logGroupName, region, options, retentionInDays) {
    var _a;
    // The same as in createLogGroupSafe(), here we could end up with the race
    // condition where a log group is either already being created or its retention
    // policy is being updated. This would result in an OperationAbortedException,
    // which we will try to catch and retry the command a number of times before failing
    let retryCount = (options === null || options === void 0 ? void 0 : options.maxRetries) == undefined ? 10 : options.maxRetries;
    const delay = ((_a = options === null || options === void 0 ? void 0 : options.retryOptions) === null || _a === void 0 ? void 0 : _a.base) == undefined ? 10 : options.retryOptions.base;
    do {
        try {
            const cloudwatchlogs = new AWS.CloudWatchLogs({ apiVersion: '2014-03-28', region, ...options });
            if (!retentionInDays) {
                await cloudwatchlogs.deleteRetentionPolicy({ logGroupName }).promise();
            }
            else {
                await cloudwatchlogs.putRetentionPolicy({ logGroupName, retentionInDays }).promise();
            }
            return;
        }
        catch (error) {
            if (error.code === 'OperationAbortedException') {
                if (retryCount > 0) {
                    retryCount--;
                    await new Promise(resolve => setTimeout(resolve, delay));
                    continue;
                }
                else {
                    // The log group is still being created by another execution but we are out of retries
                    throw new Error('Out of attempts to create a logGroup');
                }
            }
            throw error;
        }
    } while (true); // exit happens on retry count check
}
async function handler(event, context) {
    try {
        console.log(JSON.stringify(event));
        // The target log group
        const logGroupName = event.ResourceProperties.LogGroupName;
        // The region of the target log group
        const logGroupRegion = event.ResourceProperties.LogGroupRegion;
        // Parse to AWS SDK retry options
        const retryOptions = parseRetryOptions(event.ResourceProperties.SdkRetry);
        if (event.RequestType === 'Create' || event.RequestType === 'Update') {
            // Act on the target log group
            await createLogGroupSafe(logGroupName, logGroupRegion, retryOptions);
            await setRetentionPolicy(logGroupName, logGroupRegion, retryOptions, parseInt(event.ResourceProperties.RetentionInDays, 10));
            if (event.RequestType === 'Create') {
                // Set a retention policy of 1 day on the logs of this very function.
                // Due to the async nature of the log group creation, the log group for this function might
                // still be not created yet at this point. Therefore we attempt to create it.
                // In case it is being created, createLogGroupSafe will handle the conflict.
                const region = process.env.AWS_REGION;
                await createLogGroupSafe(`/aws/lambda/${context.functionName}`, region, retryOptions);
                // If createLogGroupSafe fails, the log group is not created even after multiple attempts.
                // In this case we have nothing to set the retention policy on but an exception will skip
                // the next line.
                await setRetentionPolicy(`/aws/lambda/${context.functionName}`, region, retryOptions, 1);
            }
        }
        await respond('SUCCESS', 'OK', logGroupName);
    }
    catch (e) {
        console.log(e);
        await respond('FAILED', e.message, event.ResourceProperties.LogGroupName);
    }
    function respond(responseStatus, reason, physicalResourceId) {
        const responseBody = JSON.stringify({
            Status: responseStatus,
            Reason: reason,
            PhysicalResourceId: physicalResourceId,
            StackId: event.StackId,
            RequestId: event.RequestId,
            LogicalResourceId: event.LogicalResourceId,
            Data: {
                // Add log group name as part of the response so that it's available via Fn::GetAtt
                LogGroupName: event.ResourceProperties.LogGroupName,
            },
        });
        console.log('Responding', responseBody);
        // eslint-disable-next-line @typescript-eslint/no-require-imports
        const parsedUrl = require('url').parse(event.ResponseURL);
        const requestOptions = {
            hostname: parsedUrl.hostname,
            path: parsedUrl.path,
            method: 'PUT',
            headers: { 'content-type': '', 'content-length': responseBody.length },
        };
        return new Promise((resolve, reject) => {
            try {
                // eslint-disable-next-line @typescript-eslint/no-require-imports
                const request = require('https').request(requestOptions, resolve);
                request.on('error', reject);
                request.write(responseBody);
                request.end();
            }
            catch (e) {
                reject(e);
            }
        });
    }
    function parseRetryOptions(rawOptions) {
        const retryOptions = {};
        if (rawOptions) {
            if (rawOptions.maxRetries) {
                retryOptions.maxRetries = parseInt(rawOptions.maxRetries, 10);
            }
            if (rawOptions.base) {
                retryOptions.retryOptions = {
                    base: parseInt(rawOptions.base, 10),
                };
            }
        }
        return retryOptions;
    }
}
exports.handler = handler;
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eslint-disable no-console */\n\n// eslint-disable-next-line import/no-extraneous-dependencies\nimport * as AWS from 'aws-sdk';\n// eslint-disable-next-line import/no-extraneous-dependencies\nimport type { RetryDelayOptions } from 'aws-sdk/lib/config-base';\n\ninterface SdkRetryOptions {\n  maxRetries?: number;\n  retryOptions?: RetryDelayOptions;\n}\n\n/**\n * Creates a log group and doesn't throw if it exists.\n *\n * @param logGroupName the name of the log group to create.\n * @param region to create the log group in\n * @param options CloudWatch API SDK options.\n */\nasync function createLogGroupSafe(logGroupName: string, region?: string, options?: SdkRetryOptions) {\n  // If we set the log retention for a lambda, then due to the async nature of\n  // Lambda logging there could be a race condition when the same log group is\n  // already being created by the lambda execution. This can sometime result in\n  // an error \"OperationAbortedException: A conflicting operation is currently\n  // in progress...Please try again.\"\n  // To avoid an error, we do as requested and try again.\n  let retryCount = options?.maxRetries == undefined ? 10 : options.maxRetries;\n  const delay = options?.retryOptions?.base == undefined ? 10 : options.retryOptions.base;\n  do {\n    try {\n      const cloudwatchlogs = new AWS.CloudWatchLogs({ apiVersion: '2014-03-28', region, ...options });\n      await cloudwatchlogs.createLogGroup({ logGroupName }).promise();\n      return;\n    } catch (error) {\n      if (error.code === 'ResourceAlreadyExistsException') {\n        // The log group is already created by the lambda execution\n        return;\n      }\n      if (error.code === 'OperationAbortedException') {\n        if (retryCount > 0) {\n          retryCount--;\n          await new Promise(resolve => setTimeout(resolve, delay));\n          continue;\n        } else {\n          // The log group is still being created by another execution but we are out of retries\n          throw new Error('Out of attempts to create a logGroup');\n        }\n      }\n      throw error;\n    }\n  } while (true); // exit happens on retry count check\n}\n\n/**\n * Puts or deletes a retention policy on a log group.\n *\n * @param logGroupName the name of the log group to create\n * @param region the region of the log group\n * @param options CloudWatch API SDK options.\n * @param retentionInDays the number of days to retain the log events in the specified log group.\n */\nasync function setRetentionPolicy(logGroupName: string, region?: string, options?: SdkRetryOptions, retentionInDays?: number) {\n  // The same as in createLogGroupSafe(), here we could end up with the race\n  // condition where a log group is either already being created or its retention\n  // policy is being updated. This would result in an OperationAbortedException,\n  // which we will try to catch and retry the command a number of times before failing\n  let retryCount = options?.maxRetries == undefined ? 10 : options.maxRetries;\n  const delay = options?.retryOptions?.base == undefined ? 10 : options.retryOptions.base;\n  do {\n    try {\n      const cloudwatchlogs = new AWS.CloudWatchLogs({ apiVersion: '2014-03-28', region, ...options });\n      if (!retentionInDays) {\n        await cloudwatchlogs.deleteRetentionPolicy({ logGroupName }).promise();\n      } else {\n        await cloudwatchlogs.putRetentionPolicy({ logGroupName, retentionInDays }).promise();\n      }\n      return;\n\n    } catch (error) {\n      if (error.code === 'OperationAbortedException') {\n        if (retryCount > 0) {\n          retryCount--;\n          await new Promise(resolve => setTimeout(resolve, delay));\n          continue;\n        } else {\n          // The log group is still being created by another execution but we are out of retries\n          throw new Error('Out of attempts to create a logGroup');\n        }\n      }\n      throw error;\n    }\n  } while (true); // exit happens on retry count check\n}\n\nexport async function handler(event: AWSLambda.CloudFormationCustomResourceEvent, context: AWSLambda.Context) {\n  try {\n    console.log(JSON.stringify(event));\n\n    // The target log group\n    const logGroupName = event.ResourceProperties.LogGroupName;\n\n    // The region of the target log group\n    const logGroupRegion = event.ResourceProperties.LogGroupRegion;\n\n    // Parse to AWS SDK retry options\n    const retryOptions = parseRetryOptions(event.ResourceProperties.SdkRetry);\n\n    if (event.RequestType === 'Create' || event.RequestType === 'Update') {\n      // Act on the target log group\n      await createLogGroupSafe(logGroupName, logGroupRegion, retryOptions);\n      await setRetentionPolicy(logGroupName, logGroupRegion, retryOptions, parseInt(event.ResourceProperties.RetentionInDays, 10));\n\n      if (event.RequestType === 'Create') {\n        // Set a retention policy of 1 day on the logs of this very function.\n        // Due to the async nature of the log group creation, the log group for this function might\n        // still be not created yet at this point. Therefore we attempt to create it.\n        // In case it is being created, createLogGroupSafe will handle the conflict.\n        const region = process.env.AWS_REGION;\n        await createLogGroupSafe(`/aws/lambda/${context.functionName}`, region, retryOptions);\n        // If createLogGroupSafe fails, the log group is not created even after multiple attempts.\n        // In this case we have nothing to set the retention policy on but an exception will skip\n        // the next line.\n        await setRetentionPolicy(`/aws/lambda/${context.functionName}`, region, retryOptions, 1);\n      }\n    }\n\n    await respond('SUCCESS', 'OK', logGroupName);\n  } catch (e) {\n    console.log(e);\n\n    await respond('FAILED', e.message, event.ResourceProperties.LogGroupName);\n  }\n\n  function respond(responseStatus: string, reason: string, physicalResourceId: string) {\n    const responseBody = JSON.stringify({\n      Status: responseStatus,\n      Reason: reason,\n      PhysicalResourceId: physicalResourceId,\n      StackId: event.StackId,\n      RequestId: event.RequestId,\n      LogicalResourceId: event.LogicalResourceId,\n      Data: {\n        // Add log group name as part of the response so that it's available via Fn::GetAtt\n        LogGroupName: event.ResourceProperties.LogGroupName,\n      },\n    });\n\n    console.log('Responding', responseBody);\n\n    // eslint-disable-next-line @typescript-eslint/no-require-imports\n    const parsedUrl = require('url').parse(event.ResponseURL);\n    const requestOptions = {\n      hostname: parsedUrl.hostname,\n      path: parsedUrl.path,\n      method: 'PUT',\n      headers: { 'content-type': '', 'content-length': responseBody.length },\n    };\n\n    return new Promise((resolve, reject) => {\n      try {\n        // eslint-disable-next-line @typescript-eslint/no-require-imports\n        const request = require('https').request(requestOptions, resolve);\n        request.on('error', reject);\n        request.write(responseBody);\n        request.end();\n      } catch (e) {\n        reject(e);\n      }\n    });\n  }\n\n  function parseRetryOptions(rawOptions: any): SdkRetryOptions {\n    const retryOptions: SdkRetryOptions = {};\n    if (rawOptions) {\n      if (rawOptions.maxRetries) {\n        retryOptions.maxRetries = parseInt(rawOptions.maxRetries, 10);\n      }\n      if (rawOptions.base) {\n        retryOptions.retryOptions = {\n          base: parseInt(rawOptions.base, 10),\n        };\n      }\n    }\n    return retryOptions;\n  }\n}\n"]}