added configurable '/systemd' endpoints

.nvmrc

@@ -1 +1 @@
-default
+16

.vscode/launch.json

@@ -3,6 +3,7 @@
     "configurations": [
         {
             "type": "pwa-node",
+            "runtimeVersion": "16",
             "request": "launch",
             "name": "api",
             "skipFiles": [

config.json

@@ -7,6 +7,9 @@
     "active": true,
     "lifetime": 0
   },
+  "systemd": [
+    "docker"
+  ],
   "log": {
     "level": "debug",
     "format": "DD.MM.YYYY HH:mm:ss:SS"

libs/api.js

@@ -4,6 +4,7 @@ const constants = require('./constants.js');
 const modep = require('./modep.js');
 const osc = require('./osc.js');
 const info = require('./info.js');
+const systemd = require('./systemd.js');
 
 const endpoints = new Map();
 
@@ -71,6 +72,15 @@ async function setupEndpoints() {
         undefined,
         { method: osc.sendByRequest }
     )
+    if (global.config.systemd !== undefined) {
+        for (let index = 0; index < global.config.systemd.length; index++) {
+            setEndpoint(
+                constants.API_SYSTEMD + '/' + global.config.systemd[index],
+                { method: systemd.getServiceState },
+                { method: systemd.setServiceState }
+            )
+        }
+    }
     logger.debug('setting up ' + endpoints.size + ' endpoints took ' + util.timeDiff(timestamp) + 'ms');
 }
 

libs/commands.js

@@ -2,22 +2,45 @@ const logger = require('./logger.js');
 const util = require('./util.js');
 const { spawn } = require('child_process');
 
-function execute(cmd, args) {
-    return new Promise(function (resolve, reject) {
-        var spawned = spawn(cmd, args);
+function execute(cmd, args, await) {
+    return new Promise((resolve, reject) => {
+        let result = '';
+        let error = '';
+        const spawned = spawn(cmd, args);
         spawned.timestamp = new Date();
-        spawned.stdout.on('data', function (data) {
-            logger.debug(data);
+        spawned.on('spawn', () => {
+            logger.info('spawned command \'' + cmd + '\' with args \'' + args + '\'');
+            if (await !== true) {
+                resolve();
+            }
         });
-        spawned.stderr.on('data', function (data) {
-            logger.error(data);
+        spawned.stdout.on('data', (data) => {
+            result += data;
         });
-        spawned.on('error', function (err) {
+        spawned.stderr.on('data', (data) => {
+            if (data.toString().toLowerCase().startsWith('warning')) {
+                result += data;
+                return;
+            }
+            error += data;
+        });
+        spawned.on('error', (err) => {
             reject('command \'' + cmd + '\' with args \'' + args + '\' encountered an error after ' + util.timeDiff(spawned.timestamp) + 'ms >>> ' + err);
         });
-        spawned.on('exit', function (code) {
-            logger.debug('command \'' + cmd + '\' with args \'' + args + '\' finished with exit code ' + code + ' after ' + util.timeDiff(spawned.timestamp) + 'ms');
-            resolve();
+        spawned.on('exit', (code) => {
+            let msg = 'command \'' + cmd + '\' with args \'' + args + '\' finished with exit code ' + code + ' after ' + util.timeDiff(spawned.timestamp) + 'ms';
+            if (error !== undefined && error.length > 0) {
+                error = error.trim();
+                msg += ' > error: ' + error;
+                logger.error(error);
+                return reject(error);
+            }
+            if (result !== undefined && result.length > 0) {
+                result = result.trim();
+                msg += ' > data: ' + result;
+            }
+            logger.info(msg);
+            resolve(result);
         });
     });
 }

libs/constants.js

@@ -8,6 +8,11 @@ const PEDALBOARDS = '/pedalboards';
 const PEDALS = '/pedals';
 const BYPASS = '/bypass';
 const MIDI = '/midi';
+const SYSTEMD = '/systemd';
+
+exports.SYSTEMD_STATE_ACTIVE = 'active';
+exports.SYSTEMD_STATE_INACTIVE = 'inactive';
+exports.SYSTEMD_STATE_TOGGLE = 'toggle';
 
 exports.VARIABLE_ID = VARIABLE_ID;
 
@@ -27,6 +32,7 @@ exports.API_PEDAL_BY_ID = PEDALS + '/' + VARIABLE_ID;
 exports.API_BYPASS = BYPASS;
 exports.API_BYPASS_BY_ID = BYPASS + '/' + VARIABLE_ID;
 exports.API_MIDI = MIDI;
+exports.API_SYSTEMD = SYSTEMD;
 
 exports.CACHE_INFO = "info";
 exports.CACHE_BANKS = "banks";

libs/systemd.js

@@ -0,0 +1,50 @@
+const logger = require('./logger.js');
+const commands = require('./commands.js');
+const constants = require('./constants.js');
+const blinky = require('./blinky.js');
+
+async function getServiceState(name) {
+    if (name === undefined) {
+        return;
+    }
+    logger.debug('checking service \'' + name + '\'...');
+    const state = await commands.execute('systemctl', ['is-active', name], true);
+    logger.debug('state of service \'' + name + '\' is \'' + state + '\'');
+    return { service: name, state: state };
+}
+
+async function setServiceState(name, args) {
+    if (name === undefined || args === undefined) {
+        return;
+    }
+    let state = args.get('state');
+    if (state === undefined) {
+        return;
+    }
+    if (state !== constants.SYSTEMD_STATE_ACTIVE && state !== constants.SYSTEMD_STATE_INACTIVE && state !== constants.SYSTEMD_STATE_TOGGLE) {
+        const msg = 'can not set state of service \'' + name + '\' to unknown state \'' + state + '\'';
+        logger.debug(msg);
+        return { err: msg };
+    }
+    let service = await getServiceState(name);
+    if (state !== constants.SYSTEMD_STATE_TOGGLE && service.state === state) {
+        const msg = 'service \'' + name + '\' is already in state \'' + service.state + '\'';
+        logger.debug(msg);
+        return { msg: msg };
+    }
+    let command;
+    if (service.state === constants.SYSTEMD_STATE_ACTIVE) {
+        command = 'stop';
+        state = constants.SYSTEMD_STATE_INACTIVE;
+    } else if (service.state === constants.SYSTEMD_STATE_INACTIVE) {
+        command = 'start';
+        state = constants.SYSTEMD_STATE_ACTIVE;
+    }
+    logger.debug('setting state of service \'' + name + '\' to \'' + state + '\'...');
+    return { service: name, state: state, result: await commands.execute('systemctl', [command, name], true)};
+}
+
+module.exports = {
+    getServiceState,
+    setServiceState
+}