@decaf-ts/utils
Version:
module management utils for decaf-ts
243 lines • 31.4 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.lockify = lockify;
exports.chainAbortController = chainAbortController;
exports.spawnCommand = spawnCommand;
exports.runCommand = runCommand;
const child_process_1 = require("child_process");
const StandardOutputWriter_1 = require("./../writers/StandardOutputWriter.cjs");
const constants_1 = require("./constants.cjs");
const logging_1 = require("@decaf-ts/logging");
/**
* @description Creates a locked version of a function.
* @summary This higher-order function takes a function and returns a new function that ensures
* sequential execution of the original function, even when called multiple times concurrently.
* It uses a Promise-based locking mechanism to queue function calls.
*
* @template R - The return type of the input function.
*
* @param f - The function to be locked. It can take any number of parameters and return a value of type R.
* @return A new function with the same signature as the input function, but with sequential execution guaranteed.
*
* @function lockify
*
* @mermaid
* sequenceDiagram
* participant Caller
* participant LockedFunction
* participant OriginalFunction
* Caller->>LockedFunction: Call with params
* LockedFunction->>LockedFunction: Check current lock
* alt Lock is resolved
* LockedFunction->>OriginalFunction: Execute with params
* OriginalFunction-->>LockedFunction: Return result
* LockedFunction-->>Caller: Return result
* else Lock is pending
* LockedFunction->>LockedFunction: Queue execution
* LockedFunction-->>Caller: Return promise
* Note over LockedFunction: Wait for previous execution
* LockedFunction->>OriginalFunction: Execute with params
* OriginalFunction-->>LockedFunction: Return result
* LockedFunction-->>Caller: Resolve promise with result
* end
* LockedFunction->>LockedFunction: Update lock
*
* @memberOf module:utils
*/
function lockify(f) {
let lock = Promise.resolve();
return (...params) => {
const result = lock.then(() => f(...params));
lock = result.catch(() => { });
return result;
};
}
function chainAbortController(argument0, ...remainder) {
let signals;
let controller;
// normalize args
if (argument0 instanceof AbortSignal) {
controller = new AbortController();
signals = [argument0, ...remainder];
}
else {
controller = argument0;
signals = remainder;
}
// if the controller is already aborted, exit early
if (controller.signal.aborted) {
return controller;
}
const handler = () => controller.abort();
for (const signal of signals) {
// check before adding! (and assume there is no possible way that the signal could
// abort between the `if` check and adding the event listener)
if (signal.aborted) {
controller.abort();
break;
}
signal.addEventListener("abort", handler, {
once: true,
signal: controller.signal,
});
}
return controller;
}
/**
* @description Spawns a command as a child process with output handling.
* @summary Creates a child process to execute a command with support for piping multiple commands,
* custom output handling, and abort control. This function handles the low-level details of
* spawning processes and connecting their inputs/outputs when piping is used.
*
* @template R - The type of the processed output, defaulting to string.
* @param {StandardOutputWriter<R>} output - The output writer to handle command output.
* @param {string} command - The command to execute, can include pipe operators.
* @param {SpawnOptionsWithoutStdio} opts - Options for the spawned process.
* @param {AbortController} abort - Controller to abort the command execution.
* @param {Logger} logger - Logger for recording command execution details.
* @return {ChildProcessWithoutNullStreams} The spawned child process.
*
* @function spawnCommand
*
* @memberOf module:utils
*/
function spawnCommand(output, command, opts, abort, logger) {
function spawnInner(command, controller) {
const [cmd, argz] = output.parseCommand(command);
logger.info(`Running command: ${cmd}`);
logger.debug(`with args: ${argz.join(" ")}`);
const childProcess = (0, child_process_1.spawn)(cmd, argz, {
...opts,
cwd: opts.cwd || process.cwd(),
env: Object.assign({}, process.env, opts.env, { PATH: process.env.PATH }),
shell: opts.shell || false,
signal: controller.signal,
});
logger.verbose(`pid : ${childProcess.pid}`);
return childProcess;
}
const m = command.match(/[<>$#]/g);
if (m)
throw new Error(`Invalid command: ${command}. contains invalid characters: ${m}`);
if (command.includes(" | ")) {
const cmds = command.split(" | ");
const spawns = [];
const controllers = new Array(cmds.length);
controllers[0] = abort;
for (let i = 0; i < cmds.length; i++) {
if (i !== 0)
controllers[i] = chainAbortController(controllers[i - 1].signal);
spawns.push(spawnInner(cmds[i], controllers[i]));
if (i === 0)
continue;
spawns[i - 1].stdout.pipe(spawns[i].stdin);
}
return spawns[cmds.length - 1];
}
return spawnInner(command, abort);
}
/**
* @description Executes a command asynchronously with customizable output handling.
* @summary This function runs a shell command as a child process, providing fine-grained
* control over its execution and output handling. It supports custom output writers,
* allows for command abortion, and captures both stdout and stderr.
*
* @template R - The type of the resolved value from the command execution.
*
* @param command - The command to run, either as a string or an array of strings.
* @param opts - Spawn options for the child process. Defaults to an empty object.
* @param outputConstructor - Constructor for the output writer. Defaults to StandardOutputWriter.
* @param args - Additional arguments to pass to the output constructor.
* @return {CommandResult} A promise that resolves to the command result of type R.
*
* @function runCommand
*
* @mermaid
* sequenceDiagram
* participant Caller
* participant runCommand
* participant OutputWriter
* participant ChildProcess
* Caller->>runCommand: Call with command and options
* runCommand->>OutputWriter: Create new instance
* runCommand->>OutputWriter: Parse command
* runCommand->>ChildProcess: Spawn process
* ChildProcess-->>runCommand: Return process object
* runCommand->>ChildProcess: Set up event listeners
* loop For each stdout data
* ChildProcess->>runCommand: Emit stdout data
* runCommand->>OutputWriter: Handle stdout data
* end
* loop For each stderr data
* ChildProcess->>runCommand: Emit stderr data
* runCommand->>OutputWriter: Handle stderr data
* end
* ChildProcess->>runCommand: Emit error (if any)
* runCommand->>OutputWriter: Handle error
* ChildProcess->>runCommand: Emit exit
* runCommand->>OutputWriter: Handle exit
* OutputWriter-->>runCommand: Resolve or reject promise
* runCommand-->>Caller: Return CommandResult
*
* @memberOf module:utils
*/
function runCommand(command, opts = {}, outputConstructor = (StandardOutputWriter_1.StandardOutputWriter), ...args) {
const logger = logging_1.Logging.for(runCommand);
const abort = new AbortController();
const result = {
abort: abort,
command: command,
logs: [],
errs: [],
};
const lock = new Promise((resolve, reject) => {
let output;
try {
output = new outputConstructor(command, {
resolve,
reject,
}, ...args);
result.cmd = spawnCommand(output, command, opts, abort, logger);
}
catch (e) {
return reject(new Error(`Error running command ${command}: ${e}`));
}
result.cmd.stdout.setEncoding("utf8");
result.cmd.stdout.on("data", (chunk) => {
chunk = chunk.toString();
result.logs.push(chunk);
output.data(chunk);
});
result.cmd.stderr.on("data", (data) => {
data = data.toString();
result.errs.push(data);
output.error(data);
});
result.cmd.once("error", (err) => {
output.exit(err.message, result.errs);
});
result.cmd.once("exit", (code = 0) => {
if (abort.signal.aborted && code === null)
code = constants_1.AbortCode;
output.exit(code, code === 0 ? result.logs : result.errs);
});
});
Object.assign(result, {
promise: lock,
pipe: async (cb) => {
const l = logger.for("pipe");
try {
l.verbose(`Executing pipe function ${command}...`);
const result = await lock;
l.verbose(`Piping output to ${cb.name}: ${result}`);
return cb(result);
}
catch (e) {
l.error(`Error piping command output: ${e}`);
throw e;
}
},
});
return result;
}
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{\n  ChildProcessWithoutNullStreams,\n  spawn,\n  SpawnOptionsWithoutStdio,\n} from \"child_process\";\nimport { StandardOutputWriter } from \"../writers/StandardOutputWriter\";\nimport { CommandResult } from \"./types\";\nimport { OutputWriterConstructor } from \"../writers/types\";\nimport { AbortCode } from \"./constants\";\nimport { Logger, Logging } from \"@decaf-ts/logging\";\n\n/**\n * @description Creates a locked version of a function.\n * @summary This higher-order function takes a function and returns a new function that ensures\n * sequential execution of the original function, even when called multiple times concurrently.\n * It uses a Promise-based locking mechanism to queue function calls.\n *\n * @template R - The return type of the input function.\n *\n * @param f - The function to be locked. It can take any number of parameters and return a value of type R.\n * @return A new function with the same signature as the input function, but with sequential execution guaranteed.\n *\n * @function lockify\n *\n * @mermaid\n * sequenceDiagram\n *   participant Caller\n *   participant LockedFunction\n *   participant OriginalFunction\n *   Caller->>LockedFunction: Call with params\n *   LockedFunction->>LockedFunction: Check current lock\n *   alt Lock is resolved\n *     LockedFunction->>OriginalFunction: Execute with params\n *     OriginalFunction-->>LockedFunction: Return result\n *     LockedFunction-->>Caller: Return result\n *   else Lock is pending\n *     LockedFunction->>LockedFunction: Queue execution\n *     LockedFunction-->>Caller: Return promise\n *     Note over LockedFunction: Wait for previous execution\n *     LockedFunction->>OriginalFunction: Execute with params\n *     OriginalFunction-->>LockedFunction: Return result\n *     LockedFunction-->>Caller: Resolve promise with result\n *   end\n *   LockedFunction->>LockedFunction: Update lock\n *\n * @memberOf module:utils\n */\nexport function lockify<R>(f: (...params: unknown[]) => R) {\n  let lock: Promise<R | void> = Promise.resolve();\n  return (...params: unknown[]) => {\n    const result = lock.then(() => f(...params));\n    lock = result.catch(() => {});\n    return result;\n  };\n}\n\n/**\n * @description Chains multiple abort signals to a controller.\n * @summary Creates a mechanism where multiple abort signals can trigger a single abort controller.\n * This is useful for coordinating cancellation across multiple asynchronous operations.\n *\n * @param {AbortController} controller - The abort controller to be triggered by signals.\n * @param {...AbortSignal} signals - One or more abort signals that can trigger the controller.\n * @return {AbortController} The input controller, now connected to the signals.\n *\n * @function chainAbortController\n *\n * @memberOf module:utils\n */\nexport function chainAbortController(\n  controller: AbortController,\n  ...signals: AbortSignal[]\n): AbortController;\n\n/**\n * @description Creates a new controller chained to multiple abort signals.\n * @summary Creates a new abort controller that will be triggered if any of the provided signals are aborted.\n *\n * @param {...AbortSignal} signals - One or more abort signals that can trigger the new controller.\n * @return {AbortController} A new abort controller connected to the signals.\n *\n * @function chainAbortController\n *\n * @memberOf module:utils\n */\nexport function chainAbortController(\n  ...signals: AbortSignal[]\n): AbortController;\n\nexport function chainAbortController(\n  argument0: AbortController | AbortSignal,\n  ...remainder: AbortSignal[]\n): AbortController {\n  let signals: AbortSignal[];\n  let controller: AbortController;\n\n  // normalize args\n  if (argument0 instanceof AbortSignal) {\n    controller = new AbortController();\n    signals = [argument0, ...remainder];\n  } else {\n    controller = argument0;\n    signals = remainder;\n  }\n\n  // if the controller is already aborted, exit early\n  if (controller.signal.aborted) {\n    return controller;\n  }\n\n  const handler = () => controller.abort();\n\n  for (const signal of signals) {\n    // check before adding! (and assume there is no possible way that the signal could\n    // abort between the `if` check and adding the event listener)\n    if (signal.aborted) {\n      controller.abort();\n      break;\n    }\n    signal.addEventListener(\"abort\", handler, {\n      once: true,\n      signal: controller.signal,\n    });\n  }\n\n  return controller;\n}\n\n/**\n * @description Spawns a command as a child process with output handling.\n * @summary Creates a child process to execute a command with support for piping multiple commands,\n * custom output handling, and abort control. This function handles the low-level details of\n * spawning processes and connecting their inputs/outputs when piping is used.\n *\n * @template R - The type of the processed output, defaulting to string.\n * @param {StandardOutputWriter<R>} output - The output writer to handle command output.\n * @param {string} command - The command to execute, can include pipe operators.\n * @param {SpawnOptionsWithoutStdio} opts - Options for the spawned process.\n * @param {AbortController} abort - Controller to abort the command execution.\n * @param {Logger} logger - Logger for recording command execution details.\n * @return {ChildProcessWithoutNullStreams} The spawned child process.\n *\n * @function spawnCommand\n *\n * @memberOf module:utils\n */\nexport function spawnCommand<R = string>(\n  output: StandardOutputWriter<R>,\n  command: string,\n  opts: SpawnOptionsWithoutStdio,\n  abort: AbortController,\n  logger: Logger\n): ChildProcessWithoutNullStreams {\n  function spawnInner(command: string, controller: AbortController) {\n    const [cmd, argz] = output.parseCommand(command);\n    logger.info(`Running command: ${cmd}`);\n    logger.debug(`with args: ${argz.join(\" \")}`);\n    const childProcess = spawn(cmd, argz, {\n      ...opts,\n      cwd: opts.cwd || process.cwd(),\n      env: Object.assign({}, process.env, opts.env, { PATH: process.env.PATH }),\n      shell: opts.shell || false,\n      signal: controller.signal,\n    });\n    logger.verbose(`pid : ${childProcess.pid}`);\n    return childProcess;\n  }\n\n  const m = command.match(/[<>$#]/g);\n  if (m)\n    throw new Error(\n      `Invalid command: ${command}. contains invalid characters: ${m}`\n    );\n  if (command.includes(\" | \")) {\n    const cmds = command.split(\" | \");\n    const spawns = [];\n    const controllers = new Array(cmds.length);\n    controllers[0] = abort;\n    for (let i = 0; i < cmds.length; i++) {\n      if (i !== 0)\n        controllers[i] = chainAbortController(controllers[i - 1].signal);\n      spawns.push(spawnInner(cmds[i], controllers[i]));\n      if (i === 0) continue;\n      spawns[i - 1].stdout.pipe(spawns[i].stdin);\n    }\n    return spawns[cmds.length - 1];\n  }\n\n  return spawnInner(command, abort);\n}\n\n/**\n * @description Executes a command asynchronously with customizable output handling.\n * @summary This function runs a shell command as a child process, providing fine-grained\n * control over its execution and output handling. It supports custom output writers,\n * allows for command abortion, and captures both stdout and stderr.\n *\n * @template R - The type of the resolved value from the command execution.\n *\n * @param command - The command to run, either as a string or an array of strings.\n * @param opts - Spawn options for the child process. Defaults to an empty object.\n * @param outputConstructor - Constructor for the output writer. Defaults to StandardOutputWriter.\n * @param args - Additional arguments to pass to the output constructor.\n * @return {CommandResult} A promise that resolves to the command result of type R.\n *\n * @function runCommand\n *\n * @mermaid\n * sequenceDiagram\n *   participant Caller\n *   participant runCommand\n *   participant OutputWriter\n *   participant ChildProcess\n *   Caller->>runCommand: Call with command and options\n *   runCommand->>OutputWriter: Create new instance\n *   runCommand->>OutputWriter: Parse command\n *   runCommand->>ChildProcess: Spawn process\n *   ChildProcess-->>runCommand: Return process object\n *   runCommand->>ChildProcess: Set up event listeners\n *   loop For each stdout data\n *     ChildProcess->>runCommand: Emit stdout data\n *     runCommand->>OutputWriter: Handle stdout data\n *   end\n *   loop For each stderr data\n *     ChildProcess->>runCommand: Emit stderr data\n *     runCommand->>OutputWriter: Handle stderr data\n *   end\n *   ChildProcess->>runCommand: Emit error (if any)\n *   runCommand->>OutputWriter: Handle error\n *   ChildProcess->>runCommand: Emit exit\n *   runCommand->>OutputWriter: Handle exit\n *   OutputWriter-->>runCommand: Resolve or reject promise\n *   runCommand-->>Caller: Return CommandResult\n *\n * @memberOf module:utils\n */\nexport function runCommand<R = string>(\n  command: string,\n  opts: SpawnOptionsWithoutStdio = {},\n  outputConstructor: OutputWriterConstructor<\n    R,\n    StandardOutputWriter<R>,\n    Error\n  > = StandardOutputWriter<R>,\n  ...args: unknown[]\n): CommandResult<R> {\n  const logger = Logging.for(runCommand);\n  const abort = new AbortController();\n\n  const result: Omit<CommandResult, \"promise\" | \"pipe\"> = {\n    abort: abort,\n    command: command,\n    logs: [],\n    errs: [],\n  };\n\n  const lock = new Promise<R>((resolve, reject) => {\n    let output;\n    try {\n      output = new outputConstructor(\n        command,\n        {\n          resolve,\n          reject,\n        },\n        ...args\n      );\n\n      result.cmd = spawnCommand<R>(output, command, opts, abort, logger);\n    } catch (e: unknown) {\n      return reject(new Error(`Error running command ${command}: ${e}`));\n    }\n\n    result.cmd.stdout.setEncoding(\"utf8\");\n\n    result.cmd.stdout.on(\"data\", (chunk: any) => {\n      chunk = chunk.toString();\n      result.logs.push(chunk);\n      output.data(chunk);\n    });\n\n    result.cmd.stderr.on(\"data\", (data: any) => {\n      data = data.toString();\n      result.errs.push(data);\n      output.error(data);\n    });\n\n    result.cmd.once(\"error\", (err: Error) => {\n      output.exit(err.message, result.errs);\n    });\n\n    result.cmd.once(\"exit\", (code: number = 0) => {\n      if (abort.signal.aborted && code === null) code = AbortCode as any;\n      output.exit(code, code === 0 ? result.logs : result.errs);\n    });\n  });\n\n  Object.assign(result, {\n    promise: lock,\n    pipe: async <E>(cb: (r: R) => E) => {\n      const l = logger.for(\"pipe\");\n      try {\n        l.verbose(`Executing pipe function ${command}...`);\n        const result: R = await lock;\n        l.verbose(`Piping output to ${cb.name}: ${result}`);\n        return cb(result);\n      } catch (e: unknown) {\n        l.error(`Error piping command output: ${e}`);\n        throw e;\n      }\n    },\n  });\n\n  return result as CommandResult<R>;\n}\n"]}