aws-cdk
Version:
CDK Toolkit, the command line tool for CDK apps
96 lines • 16 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.findCloudWatchLogGroups = findCloudWatchLogGroups;
const logging_1 = require("../../logging");
const error_1 = require("../../util/error");
const environment_access_1 = require("../environment-access");
const evaluate_cloudformation_template_1 = require("../evaluate-cloudformation-template");
const mode_1 = require("../plugin/mode");
const toolkit_info_1 = require("../toolkit-info");
// resource types that have associated CloudWatch Log Groups that should _not_ be monitored
const IGNORE_LOGS_RESOURCE_TYPES = ['AWS::EC2::FlowLog', 'AWS::CloudTrail::Trail', 'AWS::CodeBuild::Project'];
async function findCloudWatchLogGroups(sdkProvider, stackArtifact) {
let sdk;
const resolvedEnv = await sdkProvider.resolveEnvironment(stackArtifact.environment);
// try to assume the lookup role and fallback to the default credentials
try {
sdk = (await new environment_access_1.EnvironmentAccess(sdkProvider, toolkit_info_1.DEFAULT_TOOLKIT_STACK_NAME).accessStackForLookup(stackArtifact)).sdk;
}
catch (e) {
(0, logging_1.debug)(`Failed to access SDK environment: ${(0, error_1.formatErrorMessage)(e)}`);
sdk = (await sdkProvider.forEnvironment(resolvedEnv, mode_1.Mode.ForReading)).sdk;
}
const listStackResources = new evaluate_cloudformation_template_1.LazyListStackResources(sdk, stackArtifact.stackName);
const evaluateCfnTemplate = new evaluate_cloudformation_template_1.EvaluateCloudFormationTemplate({
stackName: stackArtifact.stackName,
template: stackArtifact.template,
parameters: {},
account: resolvedEnv.account,
region: resolvedEnv.region,
partition: (await sdk.currentAccount()).partition,
sdk,
});
const stackResources = await listStackResources.listStackResources();
const logGroupNames = findAllLogGroupNames(stackResources, evaluateCfnTemplate);
return {
env: resolvedEnv,
sdk,
logGroupNames,
};
}
/**
* Determine if a CloudWatch Log Group is associated
* with an ignored resource
*/
function isReferencedFromIgnoredResource(logGroupResource, evaluateCfnTemplate) {
const resourcesReferencingLogGroup = evaluateCfnTemplate.findReferencesTo(logGroupResource.LogicalResourceId);
return resourcesReferencingLogGroup.some((reference) => {
return IGNORE_LOGS_RESOURCE_TYPES.includes(reference.Type);
});
}
const cloudWatchLogsResolvers = {
'AWS::Logs::LogGroup': (resource, evaluateCfnTemplate) => {
if (isReferencedFromIgnoredResource(resource, evaluateCfnTemplate)) {
return undefined;
}
return resource.PhysicalResourceId?.toString();
},
// Resource types that will create a CloudWatch log group with a specific name if one is not provided.
// The keys are CFN resource types, and the values are the name of the physical name property of that resource
// and the service name that is used in the automatically created CloudWatch log group.
'AWS::Lambda::Function': (resource, evaluateCfnTemplate) => {
const loggingConfig = evaluateCfnTemplate.getResourceProperty(resource.LogicalResourceId, 'LoggingConfig');
if (loggingConfig?.LogGroup) {
// if LogGroup is a string then use it as the LogGroupName as it is referred by LogGroup.fromLogGroupArn in CDK
if (typeof loggingConfig.LogGroup === 'string') {
return loggingConfig.LogGroup;
}
// if { Ref: '...' } is used then try to resolve the LogGroupName from the referenced resource in the template
if (typeof loggingConfig.LogGroup === 'object') {
if (loggingConfig.LogGroup.Ref) {
return evaluateCfnTemplate.getResourceProperty(loggingConfig.LogGroup.Ref, 'LogGroupName');
}
}
}
return `/aws/lambda/${resource.PhysicalResourceId}`;
},
};
/**
* Find all CloudWatch Log Groups in the deployed template.
* This will find both explicitly created Log Groups (excluding those associated with ignored resources)
* and Log Groups created implicitly (i.e. Lambda Functions)
*/
function findAllLogGroupNames(stackResources, evaluateCfnTemplate) {
const logGroupNames = [];
for (const resource of stackResources) {
const logGroupResolver = cloudWatchLogsResolvers[resource.ResourceType];
if (logGroupResolver) {
const logGroupName = logGroupResolver(resource, evaluateCfnTemplate);
if (logGroupName) {
logGroupNames.push(logGroupName);
}
}
}
return logGroupNames;
}
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type { CloudFormationStackArtifact, Environment } from '@aws-cdk/cx-api';\nimport type { StackResourceSummary } from '@aws-sdk/client-cloudformation';\nimport { debug } from '../../logging';\nimport { formatErrorMessage } from '../../util/error';\nimport type { SDK, SdkProvider } from '../aws-auth';\nimport { EnvironmentAccess } from '../environment-access';\nimport { EvaluateCloudFormationTemplate, LazyListStackResources } from '../evaluate-cloudformation-template';\nimport { Mode } from '../plugin/mode';\nimport { DEFAULT_TOOLKIT_STACK_NAME } from '../toolkit-info';\n\n// resource types that have associated CloudWatch Log Groups that should _not_ be monitored\nconst IGNORE_LOGS_RESOURCE_TYPES = ['AWS::EC2::FlowLog', 'AWS::CloudTrail::Trail', 'AWS::CodeBuild::Project'];\n\n/**\n * Configuration needed to monitor CloudWatch Log Groups\n * found in a given CloudFormation Stack\n */\nexport interface FoundLogGroupsResult {\n  /**\n   * The resolved environment (account/region) that the log\n   * groups are deployed in\n   */\n  readonly env: Environment;\n\n  /**\n   * The SDK that can be used to read events from the CloudWatch\n   * Log Groups in the given environment\n   */\n  readonly sdk: SDK;\n\n  /**\n   * The names of the relevant CloudWatch Log Groups\n   * in the given CloudFormation template\n   */\n  readonly logGroupNames: string[];\n}\n\nexport async function findCloudWatchLogGroups(\n  sdkProvider: SdkProvider,\n  stackArtifact: CloudFormationStackArtifact,\n): Promise<FoundLogGroupsResult> {\n  let sdk: SDK;\n  const resolvedEnv = await sdkProvider.resolveEnvironment(stackArtifact.environment);\n  // try to assume the lookup role and fallback to the default credentials\n  try {\n    sdk = (await new EnvironmentAccess(sdkProvider, DEFAULT_TOOLKIT_STACK_NAME).accessStackForLookup(stackArtifact)).sdk;\n  } catch (e: any) {\n    debug(`Failed to access SDK environment: ${formatErrorMessage(e)}`);\n    sdk = (await sdkProvider.forEnvironment(resolvedEnv, Mode.ForReading)).sdk;\n  }\n\n  const listStackResources = new LazyListStackResources(sdk, stackArtifact.stackName);\n  const evaluateCfnTemplate = new EvaluateCloudFormationTemplate({\n    stackName: stackArtifact.stackName,\n    template: stackArtifact.template,\n    parameters: {},\n    account: resolvedEnv.account,\n    region: resolvedEnv.region,\n    partition: (await sdk.currentAccount()).partition,\n    sdk,\n  });\n\n  const stackResources = await listStackResources.listStackResources();\n  const logGroupNames = findAllLogGroupNames(stackResources, evaluateCfnTemplate);\n\n  return {\n    env: resolvedEnv,\n    sdk,\n    logGroupNames,\n  };\n}\n\n/**\n * Determine if a CloudWatch Log Group is associated\n * with an ignored resource\n */\nfunction isReferencedFromIgnoredResource(\n  logGroupResource: StackResourceSummary,\n  evaluateCfnTemplate: EvaluateCloudFormationTemplate,\n): boolean {\n  const resourcesReferencingLogGroup = evaluateCfnTemplate.findReferencesTo(logGroupResource.LogicalResourceId!);\n  return resourcesReferencingLogGroup.some((reference) => {\n    return IGNORE_LOGS_RESOURCE_TYPES.includes(reference.Type);\n  });\n}\n\ntype CloudWatchLogsResolver = (\n  resource: StackResourceSummary,\n  evaluateCfnTemplate: EvaluateCloudFormationTemplate,\n) => string | undefined;\n\nconst cloudWatchLogsResolvers: Record<string, CloudWatchLogsResolver> = {\n  'AWS::Logs::LogGroup': (resource, evaluateCfnTemplate) => {\n    if (isReferencedFromIgnoredResource(resource, evaluateCfnTemplate)) {\n      return undefined;\n    }\n    return resource.PhysicalResourceId?.toString();\n  },\n\n  // Resource types that will create a CloudWatch log group with a specific name if one is not provided.\n  // The keys are CFN resource types, and the values are the name of the physical name property of that resource\n  // and the service name that is used in the automatically created CloudWatch log group.\n  'AWS::Lambda::Function': (resource, evaluateCfnTemplate) => {\n    const loggingConfig = evaluateCfnTemplate.getResourceProperty(resource.LogicalResourceId!, 'LoggingConfig');\n    if (loggingConfig?.LogGroup) {\n      // if LogGroup is a string then use it as the LogGroupName as it is referred by LogGroup.fromLogGroupArn in CDK\n      if (typeof loggingConfig.LogGroup === 'string') {\n        return loggingConfig.LogGroup;\n      }\n\n      // if { Ref: '...' } is used then try to resolve the LogGroupName from the referenced resource in the template\n      if (typeof loggingConfig.LogGroup === 'object') {\n        if (loggingConfig.LogGroup.Ref) {\n          return evaluateCfnTemplate.getResourceProperty(loggingConfig.LogGroup.Ref, 'LogGroupName');\n        }\n      }\n    }\n\n    return `/aws/lambda/${resource.PhysicalResourceId}`;\n  },\n};\n\n/**\n * Find all CloudWatch Log Groups in the deployed template.\n * This will find both explicitly created Log Groups (excluding those associated with ignored resources)\n * and Log Groups created implicitly (i.e. Lambda Functions)\n */\nfunction findAllLogGroupNames(\n  stackResources: StackResourceSummary[],\n  evaluateCfnTemplate: EvaluateCloudFormationTemplate,\n): string[] {\n  const logGroupNames: string[] = [];\n\n  for (const resource of stackResources) {\n    const logGroupResolver = cloudWatchLogsResolvers[resource.ResourceType!];\n    if (logGroupResolver) {\n      const logGroupName = logGroupResolver(resource, evaluateCfnTemplate);\n      if (logGroupName) {\n        logGroupNames.push(logGroupName);\n      }\n    }\n  }\n\n  return logGroupNames;\n}\n"]}