@wheatstalk/aws-cdk-exec
Version:
An AWS CDK Cloud Assembly-aware command to help find and execute lambda functions and state machines
208 lines • 26.1 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.LambdaFunctionExecutor = exports.StateMachineExecutor = exports.Executor = void 0;
const aws_sdk_1 = require("./aws-sdk");
const find_matching_resources_1 = require("./find-matching-resources");
const STATE_MACHINE_TYPE = 'AWS::StepFunctions::StateMachine';
const LAMBDA_TYPE = 'AWS::Lambda::Function';
/**
* Executor base class.
*/
class Executor {
/**
* Find an executor
*/
static async find(options) {
return findExecutors(options);
}
constructor(options) {
this.physicalResourceId = options.physicalResourceId;
this.constructPath = options.constructPath;
this.logicalResourceId = options.logicalResourceId;
}
env() {
return Promise.resolve({});
}
;
validateJsonObjectInput(input) {
if (input && !isJsonObject(input)) {
throw new Error('The provided input should be a JSON object');
}
}
}
exports.Executor = Executor;
/**
* Executes a Step Functions State Machine
*/
class StateMachineExecutor extends Executor {
constructor(options) {
super(options);
this.stepFunctions = options.stepFunctions;
}
async execute(input) {
this.validateJsonObjectInput(input);
const execution = await this.stepFunctions.startExecution({
stateMachineArn: this.physicalResourceId,
input,
}).promise();
while (true) {
const description = await this.stepFunctions.describeExecution({
executionArn: execution.executionArn,
}).promise();
const executionStatus = description.status;
if (executionStatus == 'RUNNING') {
await new Promise(res => setTimeout(res, 500));
continue;
}
if (executionStatus === 'SUCCEEDED') {
const output = description.output
? JSON.parse(description.output)
: undefined;
return {
output,
};
}
// Get the end of the execution history where we should find the final
// events/cause for the execution's failure.
const history = await this.stepFunctions.getExecutionHistory({
executionArn: execution.executionArn,
reverseOrder: true,
}).promise();
function getErrorOutput(events) {
var _a;
for (const event of events) {
switch (event.type) {
case 'ExecutionFailed':
try {
// Decode a JSON-encoded cause, such as for when a Lambda task
// exception was the root cause.
return {
...event.executionFailedEventDetails,
cause: JSON.parse((_a = event.executionFailedEventDetails) === null || _a === void 0 ? void 0 : _a.cause),
};
}
catch (e) {
return event.executionFailedEventDetails;
}
case 'ExecutionAborted':
return event.executionAbortedEventDetails;
case 'ExecutionTimedOut':
return event.executionTimedOutEventDetails;
}
}
return;
}
return {
error: `State machine execution's final status is ${executionStatus}`,
output: getErrorOutput(history.events),
};
}
}
}
exports.StateMachineExecutor = StateMachineExecutor;
/**
* Executes a lambda function
*/
class LambdaFunctionExecutor extends Executor {
constructor(options) {
super(options);
this.lambda = options.lambda;
}
async execute(input) {
var _a;
this.validateJsonObjectInput(input);
const response = await this.lambda.invoke({
FunctionName: this.physicalResourceId,
Payload: input,
}).promise();
const payload = (_a = response.Payload) === null || _a === void 0 ? void 0 : _a.toString();
if (!payload) {
throw new Error('Lambda invocation did not return a payload');
}
const output = JSON.parse(payload);
const error = getLambdaErrorMessage(output);
if (error) {
return {
error,
output,
};
}
return {
output,
};
}
async env() {
var _a;
const config = await this.lambda.getFunctionConfiguration({
FunctionName: this.physicalResourceId,
}).promise();
const environmentVariables = (_a = config.Environment) === null || _a === void 0 ? void 0 : _a.Variables;
return environmentVariables !== null && environmentVariables !== void 0 ? environmentVariables : {};
}
}
exports.LambdaFunctionExecutor = LambdaFunctionExecutor;
function getLambdaErrorMessage(output) {
if (typeof output !== 'object' || output === null) {
return;
}
if (output.errorMessage) {
return output.errorMessage;
}
return;
}
/**
* Finds an executor.
*/
async function findExecutors(options) {
const { sdk } = options;
const matchingResources = (0, find_matching_resources_1.findMatchingResources)({
...options,
types: [
STATE_MACHINE_TYPE,
LAMBDA_TYPE,
],
});
const lazyListStackResources = {};
function getLazyListStackResources(matchingResource) {
if (!lazyListStackResources[matchingResource.stackName]) {
lazyListStackResources[matchingResource.stackName] = new aws_sdk_1.LazyListStackResources(sdk, matchingResource.stackName);
}
return lazyListStackResources[matchingResource.stackName];
}
return Promise.all(matchingResources.map(async (matchingResource) => {
// Cache lazy lists
const listStackResources = getLazyListStackResources(matchingResource);
const stackResource = (await listStackResources.listStackResources())
.find(sr => sr.LogicalResourceId === matchingResource.logicalResourceId);
if (!stackResource || !stackResource.PhysicalResourceId) {
throw new Error(`Could not find the physical resource id for ${matchingResource.constructPath}`);
}
switch (stackResource.ResourceType) {
case STATE_MACHINE_TYPE:
return new StateMachineExecutor({
constructPath: matchingResource.constructPath,
logicalResourceId: matchingResource.logicalResourceId,
physicalResourceId: stackResource.PhysicalResourceId,
stepFunctions: sdk.stepFunctions(),
});
case LAMBDA_TYPE:
return new LambdaFunctionExecutor({
constructPath: matchingResource.constructPath,
logicalResourceId: matchingResource.logicalResourceId,
physicalResourceId: stackResource.PhysicalResourceId,
lambda: sdk.lambda(),
});
default:
throw new Error(`Unsupported resource type ${stackResource.ResourceType}`);
}
}));
}
function isJsonObject(json) {
try {
return typeof JSON.parse(json) == 'object';
}
catch (e) {
return false;
}
}
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* as AWS from 'aws-sdk';\nimport { IAwsSdk, LazyListStackResources } from './aws-sdk';\nimport { FindMatchingResourceOptionsCommon, findMatchingResources, MatchingResource } from './find-matching-resources';\n\nconst STATE_MACHINE_TYPE = 'AWS::StepFunctions::StateMachine';\nconst LAMBDA_TYPE = 'AWS::Lambda::Function';\n\n/**\n * Options for `StateMachineExecutor`\n */\nexport interface ExecutorOptions {\n  /**\n   * The construct path of the matching resource.\n   */\n  readonly constructPath: string;\n\n  /**\n   * The logical id of the matching resource.\n   */\n  readonly logicalResourceId: string;\n\n  /**\n   * The physical resource of the resource to execute.\n   */\n  readonly physicalResourceId: string;\n}\n\n/**\n * Executor base class.\n */\nexport abstract class Executor {\n  /**\n   * Find an executor\n   */\n  static async find(options: FindExecutorOptions): Promise<Executor[]> {\n    return findExecutors(options);\n  }\n\n  readonly constructPath: string;\n  readonly physicalResourceId: string;\n  readonly logicalResourceId: string;\n\n  protected constructor(options: ExecutorOptions) {\n    this.physicalResourceId = options.physicalResourceId;\n    this.constructPath = options.constructPath;\n    this.logicalResourceId = options.logicalResourceId;\n  }\n\n  /**\n   * Execute the resource\n   *\n   * @param input Input for execution.\n   */\n  abstract execute(input?: string): Promise<ExecuteResult>;\n\n  public env(): Promise<Record<string, string>> {\n    return Promise.resolve({});\n  };\n\n  protected validateJsonObjectInput(input: string | undefined) {\n    if (input && !isJsonObject(input)) {\n      throw new Error('The provided input should be a JSON object');\n    }\n  }\n}\n\n/**\n * Options for finding executors.\n */\nexport interface FindExecutorOptions extends FindMatchingResourceOptionsCommon {\n  /**\n   * AWS SDK\n   */\n  readonly sdk: IAwsSdk;\n}\n\n/**\n * Options for `StateMachineExecutor`\n */\nexport interface StateMachineExecutorOptions extends ExecutorOptions {\n  /**\n   * The Step Functions SDK\n   */\n  readonly stepFunctions: AWS.StepFunctions;\n}\n\n/**\n * Executes a Step Functions State Machine\n */\nexport class StateMachineExecutor extends Executor {\n  private readonly stepFunctions: AWS.StepFunctions;\n\n  constructor(options: StateMachineExecutorOptions) {\n    super(options);\n    this.stepFunctions = options.stepFunctions;\n  }\n\n  async execute(input?: string): Promise<ExecuteResult> {\n    this.validateJsonObjectInput(input);\n\n    const execution = await this.stepFunctions.startExecution({\n      stateMachineArn: this.physicalResourceId,\n      input,\n    }).promise();\n\n    while (true) {\n      const description = await this.stepFunctions.describeExecution({\n        executionArn: execution.executionArn,\n      }).promise();\n\n      const executionStatus = description.status;\n      if (executionStatus == 'RUNNING') {\n        await new Promise(res => setTimeout(res, 500));\n        continue;\n      }\n\n      if (executionStatus === 'SUCCEEDED') {\n        const output = description.output\n          ? JSON.parse(description.output)\n          : undefined;\n\n        return {\n          output,\n        };\n      }\n\n      // Get the end of the execution history where we should find the final\n      // events/cause for the execution's failure.\n      const history = await this.stepFunctions.getExecutionHistory({\n        executionArn: execution.executionArn,\n        reverseOrder: true,\n      }).promise();\n\n      function getErrorOutput(events: AWS.StepFunctions.HistoryEventList) {\n        for (const event of events) {\n          switch (event.type) {\n            case 'ExecutionFailed':\n              try {\n                // Decode a JSON-encoded cause, such as for when a Lambda task\n                // exception was the root cause.\n                return {\n                  ...event.executionFailedEventDetails,\n                  cause: JSON.parse(event.executionFailedEventDetails?.cause!),\n                };\n              } catch (e) {\n                return event.executionFailedEventDetails;\n              }\n\n            case 'ExecutionAborted':\n              return event.executionAbortedEventDetails;\n            case 'ExecutionTimedOut':\n              return event.executionTimedOutEventDetails;\n          }\n        }\n\n        return;\n      }\n\n      return {\n        error: `State machine execution's final status is ${executionStatus}`,\n        output: getErrorOutput(history.events),\n      };\n    }\n  }\n}\n\n/**\n * The executor's result.\n */\nexport interface ExecuteResult {\n  /**\n   * The execution's output.\n   */\n  readonly output?: any;\n\n  /**\n   * Error message\n   */\n  readonly error?: string;\n}\n\nexport interface LambdaFunctionExecutorOptions extends ExecutorOptions {\n  /**\n   * The Lambda SDK\n   */\n  readonly lambda: AWS.Lambda;\n}\n\n/**\n * Executes a lambda function\n */\nexport class LambdaFunctionExecutor extends Executor {\n  private readonly lambda: AWS.Lambda;\n\n  constructor(options: LambdaFunctionExecutorOptions) {\n    super(options);\n    this.lambda = options.lambda;\n  }\n\n  async execute(input?: string): Promise<ExecuteResult> {\n    this.validateJsonObjectInput(input);\n\n    const response = await this.lambda.invoke({\n      FunctionName: this.physicalResourceId,\n      Payload: input,\n    }).promise();\n\n    const payload = response.Payload?.toString();\n    if (!payload) {\n      throw new Error('Lambda invocation did not return a payload');\n    }\n\n    const output = JSON.parse(payload);\n    const error = getLambdaErrorMessage(output);\n    if (error) {\n      return {\n        error,\n        output,\n      };\n    }\n\n    return {\n      output,\n    };\n  }\n\n  public async env(): Promise<Record<string, string>> {\n    const config = await this.lambda.getFunctionConfiguration({\n      FunctionName: this.physicalResourceId,\n    }).promise();\n\n    const environmentVariables = config.Environment?.Variables;\n    return environmentVariables ?? {};\n  }\n}\n\nfunction getLambdaErrorMessage(output: any) {\n  if (typeof output !== 'object' || output === null) {\n    return;\n  }\n\n  if (output.errorMessage) {\n    return output.errorMessage;\n  }\n\n  return;\n}\n\n/**\n * Finds an executor.\n */\nasync function findExecutors(options: FindExecutorOptions): Promise<Executor[]> {\n  const { sdk } = options;\n\n  const matchingResources = findMatchingResources({\n    ...options,\n    types: [\n      STATE_MACHINE_TYPE,\n      LAMBDA_TYPE,\n    ],\n  });\n\n  const lazyListStackResources: Record<string, LazyListStackResources> = {};\n  function getLazyListStackResources(matchingResource: MatchingResource) {\n    if (!lazyListStackResources[matchingResource.stackName]) {\n      lazyListStackResources[matchingResource.stackName] = new LazyListStackResources(sdk, matchingResource.stackName);\n    }\n\n    return lazyListStackResources[matchingResource.stackName];\n  }\n\n  return Promise.all(\n    matchingResources.map(async (matchingResource) => {\n      // Cache lazy lists\n      const listStackResources = getLazyListStackResources(matchingResource);\n\n      const stackResource = (await listStackResources.listStackResources())\n        .find(sr => sr.LogicalResourceId === matchingResource.logicalResourceId);\n\n      if (!stackResource || !stackResource.PhysicalResourceId) {\n        throw new Error(`Could not find the physical resource id for ${matchingResource.constructPath}`);\n      }\n\n      switch (stackResource.ResourceType) {\n        case STATE_MACHINE_TYPE:\n          return new StateMachineExecutor({\n            constructPath: matchingResource.constructPath,\n            logicalResourceId: matchingResource.logicalResourceId,\n            physicalResourceId: stackResource.PhysicalResourceId,\n            stepFunctions: sdk.stepFunctions(),\n          });\n\n        case LAMBDA_TYPE:\n          return new LambdaFunctionExecutor({\n            constructPath: matchingResource.constructPath,\n            logicalResourceId: matchingResource.logicalResourceId,\n            physicalResourceId: stackResource.PhysicalResourceId,\n            lambda: sdk.lambda(),\n          });\n\n        default:\n          throw new Error(`Unsupported resource type ${stackResource.ResourceType}`);\n      }\n    }),\n  );\n}\n\nfunction isJsonObject(json: string) {\n  try {\n    return typeof JSON.parse(json) == 'object';\n  } catch (e) {\n    return false;\n  }\n}\n"]}