magic-nix-cache-action/dist/main.js.map

{"version":3,"sources":["../src/main.ts"],"sourcesContent":["import * as fs from \"node:fs/promises\";\nimport * as os from \"node:os\";\nimport * as path from \"node:path\";\nimport { spawn, exec, SpawnOptions } from \"node:child_process\";\nimport { openSync, readFileSync } from \"node:fs\";\nimport { inspect, promisify } from \"node:util\";\nimport * as http from \"http\";\n\nimport * as core from \"@actions/core\";\nimport { Tail } from \"tail\";\nimport got from \"got\";\nimport { IdsToolbox } from \"detsys-ts\";\n\nconst ENV_CACHE_DAEMONDIR = \"MAGIC_NIX_CACHE_DAEMONDIR\";\n\nconst gotClient = got.extend({\n  retry: {\n    limit: 1,\n    methods: [\"POST\", \"GET\", \"PUT\", \"HEAD\", \"DELETE\", \"OPTIONS\", \"TRACE\"],\n  },\n  hooks: {\n    beforeRetry: [\n      (error, retryCount) => {\n        core.info(`Retrying after error ${error.code}, retry #: ${retryCount}`);\n      },\n    ],\n  },\n});\n\nasync function fetchAutoCacher(toolbox: IdsToolbox): Promise<string> {\n  const closurePath = await toolbox.fetch();\n  toolbox.recordEvent(\"load_closure\");\n  const { stdout } = await promisify(exec)(\n    `cat \"${closurePath}\" | xz -d | nix-store --import`,\n  );\n\n  const paths = stdout.split(os.EOL);\n  // Since the export is in reverse topologically sorted order, magic-nix-cache is always the penultimate entry in the list (the empty string left by split being the last).\n  const last_path = paths.at(-2);\n  return `${last_path}/bin/magic-nix-cache`;\n}\n\nfunction tailLog(daemonDir: string): Tail {\n  const log = new Tail(path.join(daemonDir, \"daemon.log\"));\n  core.debug(`tailing daemon.log...`);\n  log.on(\"line\", (line) => {\n    core.info(line);\n  });\n  return log;\n}\n\nasync function setUpAutoCache(toolbox: IdsToolbox): Promise<void> {\n  const tmpdir = process.env[\"RUNNER_TEMP\"] || os.tmpdir();\n  const required_env = [\n    \"ACTIONS_CACHE_URL\",\n    \"ACTIONS_RUNTIME_URL\",\n    \"ACTIONS_RUNTIME_TOKEN\",\n  ];\n\n  let anyMissing = false;\n  for (const n of required_env) {\n    if (!process.env.hasOwnProperty(n)) {\n      anyMissing = true;\n      core.warning(\n        `Disabling automatic caching since required environment ${n} isn't available`,\n      );\n    }\n  }\n\n  if (anyMissing) {\n    return;\n  }\n\n  core.debug(`GitHub Action Cache URL: ${process.env[\"ACTIONS_CACHE_URL\"]}`);\n\n  const daemonDir = await fs.mkdtemp(path.join(tmpdir, \"magic-nix-cache-\"));\n\n  let daemonBin: string;\n  if (core.getInput(\"source-binary\")) {\n    daemonBin = core.getInput(\"source-binary\");\n  } else {\n    daemonBin = await fetchAutoCacher(toolbox);\n  }\n\n  let runEnv;\n  if (core.isDebug()) {\n    runEnv = {\n      RUST_LOG: \"trace,magic_nix_cache=debug,gha_cache=debug\",\n      RUST_BACKTRACE: \"full\",\n      ...process.env,\n    };\n  } else {\n    runEnv = process.env;\n  }\n\n  const notifyPort = core.getInput(\"startup-notification-port\");\n\n  const notifyPromise = new Promise<Promise<void>>((resolveListening) => {\n    const promise = new Promise<void>(async (resolveQuit) => {\n      const notifyServer = http.createServer((req, res) => {\n        if (req.method === \"POST\" && req.url === \"/\") {\n          core.debug(`Notify server shutting down.`);\n          res.writeHead(200, { \"Content-Type\": \"application/json\" });\n          res.end(\"{}\");\n          notifyServer.close(() => {\n            resolveQuit();\n          });\n        }\n      });\n\n      notifyServer.listen(notifyPort, () => {\n        core.debug(`Notify server running.`);\n        resolveListening(promise);\n      });\n    });\n  });\n\n  // Start tailing the daemon log.\n  const outputPath = `${daemonDir}/daemon.log`;\n  const output = openSync(outputPath, \"a\");\n  const log = tailLog(daemonDir);\n  const netrc = await netrcPath();\n  const nixConfPath = `${process.env[\"HOME\"]}/.config/nix/nix.conf`;\n\n  const daemonCliFlags: string[] = [\n    \"--startup-notification-url\",\n    `http://127.0.0.1:${notifyPort}`,\n    \"--listen\",\n    core.getInput(\"listen\"),\n    \"--upstream\",\n    core.getInput(\"upstream-cache\"),\n    \"--diagnostic-endpoint\",\n    core.getInput(\"diagnostic-endpoint\"),\n    \"--nix-conf\",\n    nixConfPath,\n  ]\n    .concat(\n      core.getBooleanInput(\"use-flakehub\")\n        ? [\n            \"--use-flakehub\",\n            \"--flakehub-cache-server\",\n            core.getInput(\"flakehub-cache-server\"),\n            \"--flakehub-api-server\",\n            core.getInput(\"flakehub-api-server\"),\n            \"--flakehub-api-server-netrc\",\n            netrc,\n            \"--flakehub-flake-name\",\n            core.getInput(\"flakehub-flake-name\"),\n          ]\n        : [],\n    )\n    .concat(core.getBooleanInput(\"use-gha-cache\") ? [\"--use-gha-cache\"] : []);\n\n  const opts: SpawnOptions = {\n    stdio: [\"ignore\", output, output],\n    env: runEnv,\n    detached: true,\n  };\n\n  // Display the final command for debugging purposes\n  core.debug(\"Full daemon start command:\");\n  core.debug(`${daemonBin} ${daemonCliFlags.join(\" \")}`);\n\n  // Start the server. Once it is ready, it will notify us via the notification server.\n  const daemon = spawn(daemonBin, daemonCliFlags, opts);\n\n  const pidFile = path.join(daemonDir, \"daemon.pid\");\n  await fs.writeFile(pidFile, `${daemon.pid}`);\n\n  core.info(\"Waiting for magic-nix-cache to start...\");\n\n  await new Promise<void>((resolve, reject) => {\n    notifyPromise\n      // eslint-disable-next-line github/no-then\n      .then((_value) => {\n        resolve();\n      })\n      // eslint-disable-next-line github/no-then\n      .catch((err) => {\n        reject(new Error(`error in notifyPromise: ${err}`));\n      });\n    daemon.on(\"exit\", async (code, signal) => {\n      if (signal) {\n        reject(new Error(`Daemon was killed by signal ${signal}`));\n      } else if (code) {\n        reject(new Error(`Daemon exited with code ${code}`));\n      } else {\n        reject(new Error(`Daemon unexpectedly exited`));\n      }\n    });\n  });\n\n  daemon.unref();\n\n  core.info(\"Launched Magic Nix Cache\");\n  core.exportVariable(ENV_CACHE_DAEMONDIR, daemonDir);\n\n  log.unwatch();\n}\n\nasync function notifyAutoCache(): Promise<void> {\n  const daemonDir = process.env[ENV_CACHE_DAEMONDIR];\n\n  if (!daemonDir) {\n    return;\n  }\n\n  try {\n    core.debug(`Indicating workflow start`);\n    const res: Response = await gotClient\n      .post(`http://${core.getInput(\"listen\")}/api/workflow-start`)\n      .json();\n    core.debug(`back from post: ${res}`);\n  } catch (e) {\n    core.info(`Error marking the workflow as started:`);\n    core.info(inspect(e));\n    core.info(`Magic Nix Cache may not be running for this workflow.`);\n  }\n}\n\nasync function netrcPath(): Promise<string> {\n  const expectedNetrcPath = path.join(\n    process.env[\"RUNNER_TEMP\"] || os.tmpdir(),\n    \"determinate-nix-installer-netrc\",\n  );\n  try {\n    await fs.access(expectedNetrcPath);\n    return expectedNetrcPath;\n  } catch {\n    // `nix-installer` was not used, the user may be registered with FlakeHub though.\n    const destinedNetrcPath = path.join(\n      process.env[\"RUNNER_TEMP\"] || os.tmpdir(),\n      \"magic-nix-cache-netrc\",\n    );\n    try {\n      await flakehub_login(destinedNetrcPath);\n    } catch (e) {\n      core.info(\"FlakeHub cache disabled.\");\n      core.debug(`Error while logging into FlakeHub: ${e}`);\n    }\n    return destinedNetrcPath;\n  }\n}\n\nasync function flakehub_login(netrc: string): Promise<void> {\n  const jwt = await core.getIDToken(\"api.flakehub.com\");\n\n  await fs.writeFile(\n    netrc,\n    [\n      `machine api.flakehub.com login flakehub password ${jwt}`,\n      `machine flakehub.com login flakehub password ${jwt}`,\n      `machine cache.flakehub.com login flakehub password ${jwt}`,\n    ].join(\"\\n\"),\n  );\n\n  core.info(\"Logged in to FlakeHub.\");\n}\n\nasync function tearDownAutoCache(): Promise<void> {\n  const daemonDir = process.env[ENV_CACHE_DAEMONDIR];\n\n  if (!daemonDir) {\n    core.debug(\"magic-nix-cache not started - Skipping\");\n    return;\n  }\n\n  const pidFile = path.join(daemonDir, \"daemon.pid\");\n  const pid = parseInt(await fs.readFile(pidFile, { encoding: \"ascii\" }));\n  core.debug(`found daemon pid: ${pid}`);\n  if (!pid) {\n    throw new Error(\"magic-nix-cache did not start successfully\");\n  }\n\n  const log = tailLog(daemonDir);\n\n  try {\n    core.debug(`about to post to localhost`);\n    const res: Response = await gotClient\n      .post(`http://${core.getInput(\"listen\")}/api/workflow-finish`)\n      .json();\n    core.debug(`back from post: ${res}`);\n  } finally {\n    core.debug(`unwatching the daemon log`);\n    log.unwatch();\n  }\n\n  core.debug(`killing`);\n  try {\n    process.kill(pid, \"SIGTERM\");\n  } catch (e) {\n    if (typeof e === \"object\" && e && \"code\" in e && e.code !== \"ESRCH\") {\n      throw e;\n    }\n  } finally {\n    if (core.isDebug()) {\n      core.info(\"Entire log:\");\n      const entireLog = readFileSync(path.join(daemonDir, \"daemon.log\"));\n      core.info(entireLog.toString());\n    }\n  }\n}\n\nconst idslib = new IdsToolbox({\n  name: \"magic-nix-cache\",\n  fetchStyle: \"gh-env-style\",\n  idsProjectName: \"magic-nix-cache-closure\",\n  requireNix: \"warn\",\n});\n\nidslib.onMain(async () => {\n  await setUpAutoCache(idslib);\n  await notifyAutoCache();\n});\nidslib.onPost(async () => {\n  await 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