diff --git a/README.md b/README.md index f304812..c753ccc 100644 --- a/README.md +++ b/README.md @@ -1,6 +1,5 @@ # mqttpc -[![npm version](https://badge.fury.io/js/mqttpc.svg)](https://badge.fury.io/js/mqttpc) [![License][mit-badge]][mit-url] > Advanced process control via MQTT :satellite: @@ -29,9 +28,9 @@ Options: https://github.com/mqttjs/MQTT.js#connect-using-a-url [default: "mqtt://127.0.0.1"] -f, --config config file [default: "./procs.json"] - -h, --help Show help + -h, --help Show help --version Show version number - + ``` ### Config file @@ -55,16 +54,23 @@ The config file contains a JSON definition of all processes you want to control The only mandatory attribute for each process is "path", all others are optional. -* path - (string) path to the process -* args - (array[string]) arguments -* cwd - (string) the working directory (default: the cwd of mqttpc) -* env - (object) key-value paired environment (default: the env of mqttpc) -* uid - (number) user id -* gid - (number) group id -* shell - (boolean|string) run command in a shell (default: false). See https://nodejs.org/api/child_process.html#child_process_child_process_spawn_command_args_options -* disableStdin - (boolean) Disable the possibility to send data through MQTT to the process stdin (default: false). -* disableStdout - (boolean) Disable MQTT publish of the process stdout (default: false). -* disableStderr - (boolean) Disable MQTT publish of the process stderr (default: false). +* `path` - (string) path to the process +* `args` - (array[string]) arguments +* `cwd` - (string) the working directory (default: the cwd of mqttpc) +* `env` - (object) key-value paired environment (default: the env of mqttpc) +* `uid` - (number) user id +* `gid` - (number) group id +* `shell` - (boolean|string) run command in a shell (default: false). See https://nodejs.org/api/child_process.html#child_process_child_process_spawn_command_args_options +* `disableStdin` - (boolean) Disable the possibility to send data through MQTT to the process stdin (default: false). +* `stdinFromSpawnPayload` - (boolean) On spawn, send payload to stdin then close it (default: false). +* `enqueueSpawns` - (boolean) If spawn is called when it's already running, enqueue and run after process exits (default: false). +* `bufferMax` - (number default: 128k) Maximum byte size for each buffered output +* `stdout`, `stderr` and `output`: (`output` is the combination of the other two, preserving order as flushed) + * `drop`: **Default** - Output ignored + * `buffer` : Output is buffered until the last `bufferMax` bytes, and published when the process exits + * `buffer_retain` : Same as above but publishes have retain set + * `stream` : Each block of output is posted immediately (as per the decisions of the gods of buffers and node and os and so on) + * `stream_retain` : Same as above but publishes have retain set ### Usage example @@ -97,17 +103,21 @@ Errors on process spawn will be published retained on this topic. On next succes #### pc/status/<process_name>/stdout -The processes stdout will be published on this topic (not retained). +The processes `stdout` will be published on this topic. #### pc/status/<process_name>/stderr -The processes stderr will be published on this topic (not retained). +The processes `stderr` will be published on this topic. + +#### pc/status/<process_name>/output + +The processes' combined `stdout` + `stderr` will be published on this topic. #### pc/connected Mqttpc will publish ```1``` on start. Will be reset to ```0``` via last will if broker connection or mqttpc process dies. -### Topics mqttpc subscribes +### Topics mqttpc subscribes #### pc/set/<process_name>/spawn @@ -115,7 +125,7 @@ Start the process #### pc/set/<process_name>/pipe -Pipe payload into stdin of the process +Pipe payload into stdin of the process. Send an empty payload to close stdin. #### pc/set/<process_name>/signal diff --git a/index.js b/index.js index 34357ed..b19d507 100644 --- a/index.js +++ b/index.js @@ -8,6 +8,10 @@ var spawn = require('child_process').spawn; var procs = require(config.config); +const DEFAULT_BUF_SIZE = 128 * 1024; +const TOPICS_TO_WATCH_FOR_RETAINED_FROM_PREVIOUS_CONF = '/status/+/stdout /status/+/stderr /status/+/output'.split(' '); +const TOPICS_TO_WATCH_FOR_RETAINED_TIMEOUT_MS = 20 * 1000; + var mqttConnected; log.setLevel(config.verbosity); @@ -23,9 +27,19 @@ mqtt.on('connect', function () { log.info('mqtt connected', config.url); mqtt.publish(config.name + '/connected', '1', {retain: true}); - log.info('mqtt subscribe', config.name + '/set/#'); - mqtt.subscribe(config.name + '/set/#'); + const subAndLog = (topic) => { + log.info('mqtt subscribe', config.name + topic); + mqtt.subscribe(config.name + topic); + } + + subAndLog('/set/#'); + TOPICS_TO_WATCH_FOR_RETAINED_FROM_PREVIOUS_CONF.forEach(x => subAndLog(x)); + setTimeout(() => { + const topics = TOPICS_TO_WATCH_FOR_RETAINED_FROM_PREVIOUS_CONF.map(x => config.name + x); + log.info('mqtt unsubscribe', topics.join(" and ")); + mqtt.unsubscribe(topics); + }, TOPICS_TO_WATCH_FOR_RETAINED_TIMEOUT_MS); }); mqtt.on('close', function () { @@ -33,7 +47,6 @@ mqtt.on('close', function () { mqttConnected = false; log.info('mqtt closed ' + config.url); } - }); mqtt.on('error', function (err) { @@ -41,12 +54,132 @@ mqtt.on('error', function (err) { }); -mqtt.on('message', function (topic, payload) { +function appendBuffer(proc, fdName, data) { + const fds = proc._fdBuffers = proc._fdBuffers || {}; + const fdBuf = fds[fdName] = fds[fdName] || { len: 0, data: [], clipped: 0 }; + fdBuf.len += data.length; + fdBuf.data.push(data); + const max_buffer_size = proc.bufferMax || DEFAULT_BUF_SIZE; + while (fdBuf.data.length > 1 && fdBuf.len > (max_buffer_size + fdBuf.data[0].length)) { + const plopped = fdBuf.data.shift(); + fdBuf.len -= plopped.length; + fdBuf.clipped += plopped.length; + } +} + +function handleProcessOutputEach(procName, proc, fdName, data) { + log.debug(procName, fdName, data.toString().replace(/\n$/, '')); + let retain = false; + switch (proc[fdName] || 'drop') { + case 'drop': break; + case 'buffer': + case 'buffer_retain': + appendBuffer(proc, fdName, data); + break; + case 'stream_retain': + retain = true; + // no break: passthrough on purpose here + case 'stream': + mqtt.publish(config.name + '/status/' + procName + '/' + fdName, data, {retain}); + break; + default: + throw new Error("Unknown handler " + JSON.stringify(proc[fdName]) + " in proc definition for " + procName); + } +} + +function handleProcessOutput(procName, proc, fdName, data) { + handleProcessOutputEach(procName, proc, fdName, data); + handleProcessOutputEach(procName, proc, 'output', data); +} + +function handleProcessOutputAtExit(procName, proc, fdName) { + let retain = false; + switch (proc[fdName] || 'drop') { + case 'buffer_retain': + retain = true; + // no break: passthrough on purpose here + case 'buffer': + const fds = proc._fdBuffers = proc._fdBuffers || {}; + const fdBuf = fds[fdName] = fds[fdName] || { len: 0, data: [] }; + if (!fdBuf.len) return; + const dropped = fdBuf.clipped ? `...(clipped ${fdBuf.clipped})...\n` : ""; + const result = Buffer.concat(fdBuf.data, fdBuf.len); + mqtt.publish(config.name + '/status/' + procName + '/' + fdName, dropped ? (dropped + result.toString()) : result, {retain}); + delete fdBuf[fdName]; + break; + } +} + +function fdActionHasRetain(proc, fdName) { + return proc[fdName] == 'buffer_retain' || [fdName] == 'stream_retain'; +} + +function processSpawn(procName, proc, payload) { + if (proc._) { + if (proc.enqueueSpawns) { + log.warn(procName, 'already running', proc._.pid, ' enqueuing...'); + (proc.queue = proc.queue || []).push(payload); + } else { + log.error(procName, 'already running', proc._.pid); + } + return; + } + + mqtt.publish(config.name + '/status/' + procName + '/error', '', {retain: true}); + + proc._ = spawn(proc.path, proc.args, { + cwd: proc.cwd, + env: proc.env, + uid: proc.uid, + gid: proc.gid, + shell: proc.shell, + stdio: 'pipe' + }); + + if (proc._.pid) { + log.info(procName, 'started', proc.path, proc._.pid); + mqtt.publish(config.name + '/status/' + procName + '/pid', '' + proc._.pid, {retain: true}); + + } else { + log.error(procName, 'no pid, start failed'); + } + + delete proc._fdBuffers; + proc._.stdout.on('data', data => handleProcessOutput(procName, proc, 'stdout', data)); + proc._.stderr.on('data', data => handleProcessOutput(procName, proc, 'stderr', data)); + + proc._.on('exit', function (code, signal) { + log.info(procName, 'exit', code, signal); + handleProcessOutputAtExit(procName, proc, 'stdout'); + handleProcessOutputAtExit(procName, proc, 'stderr'); + handleProcessOutputAtExit(procName, proc, 'output'); + mqtt.publish(config.name + '/status/' + procName + '/pid', '', {retain: true}); + mqtt.publish(config.name + '/status/' + procName + '/exit', '' + (code === null ? signal : code), {retain: true}); + delete(proc._); + if (proc.queue && proc.queue.length) { + log.info(procName, 'finished running, dequeuing...'); + processSpawn(procName, proc, proc.queue.shift()); + } + }); + + proc._.on('error', function (e) { + log.error(procName, 'error', e); + mqtt.publish(config.name + '/status/' + procName + '/error', e.toString(), {retain: true}); + }); + + if (proc.stdinFromSpawnPayload) { + proc._.stdin.write(payload); + proc._.stdin.end(); + } + +} + +mqtt.on('message', function (topic, payload, packet) { payload = payload.toString(); log.debug('mqtt <', topic, payload); - var tmp = topic.split('/'); - + var tmp = topic.substr(config.name.length).split('/'); + const dir = tmp[1]; var p = tmp[2]; var cmd = tmp[3]; @@ -54,9 +187,20 @@ mqtt.on('message', function (topic, payload) { log.error('unknown process ' + p); return; } - var proc = procs[p]; + if (dir == "status") { + if (!packet.retain) return; + + const fd = cmd; + if (!fdActionHasRetain(proc)) { + log.warn(p, 'deleting retained mqtt but not retained in config', packet); + mqtt.publish(topic, "", {retain: true}); + } + return; + } + + switch (cmd) { case 'pipe': if (proc.disableStdin) { @@ -67,56 +211,15 @@ mqtt.on('message', function (topic, payload) { log.error(p, 'not running'); return; } + if (payload.length) + proc._.stdin.write(payload); + else + proc._.stdin.end(); break; case 'spawn': - if (proc._) { - log.error(p, 'already running', proc._.pid); - return; - } - - mqtt.publish(config.name + '/status/' + p + '/error', '', {retain: true}); - - proc._ = spawn(proc.path, proc.args, { - cwd: proc.cwd, - env: proc.env, - uid: proc.uid, - gid: proc.gid, - shell: proc.shell, - stdio: 'pipe' - }); - - if (proc._.pid) { - log.info(p, 'started', proc.path, proc._.pid); - mqtt.publish(config.name + '/status/' + p + '/pid', '' + proc._.pid, {retain: true}); - - } else { - log.error(p, 'no pid, start failed'); - } - - proc._.stdout.on('data', function (data) { - log.debug(p, 'stdout', data.toString().replace(/\n$/, '')); - if (!proc.disableStdout) mqtt.publish(config.name + '/status/' + p + '/stdout', data.toString(), {retain: true}); - }); - - proc._.stderr.on('data', function (data) { - log.debug(p, 'stderr', data.toString().replace(/\n$/, '')); - if (!proc.disableStderr) mqtt.publish(config.name + '/status/' + p + '/stderr', data.toString(), {retain: true}); - }); - - proc._.on('exit', function (code, signal) { - log.info(p, 'exit', code, signal); - mqtt.publish(config.name + '/status/' + p + '/pid', '', {retain: true}); - mqtt.publish(config.name + '/status/' + p + '/exit', '' + (typeof code === null ? signal : code), {retain: true}); - delete(proc._); - }); - - proc._.on('error', function (e) { - log.error(p, 'error', e); - mqtt.publish(config.name + '/status/' + p + '/error', e.toString(), {retain: true}); - }); - + processSpawn(p, proc, payload); break; diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..71850b6 --- /dev/null +++ b/package-lock.json @@ -0,0 +1,1001 @@ +{ + "name": "mqttpc", + "version": "1.0.1", + "lockfileVersion": 1, + "requires": true, + "dependencies": { + "ansi-regex": { + "version": "2.1.1", + "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz", + "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=" + }, + "ansi-styles": { + "version": "2.2.1", + 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