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+/**
+ * This module is used to execute and communicate with a python NeoRuntime instance.
+ *
+ * @author jakobst1n.
+ * @since 19.12.2019
+ */
+
+const fs = require("fs");
+const fsPromises = fs.promises;
+const RuntimeProcess = require("./RuntimeProcess");
+const IPC = require("./IPC");
+const logger = require(__appdir + "/src/Logger");
+const EventEmitter = require('events');
+
+/** @type {object} this should be a pointer to a object referencing all neoModules (see app.js) */
+let neoModules;
+
+/** @type {string} Currently active mode */
+let modeId = null;
+/** @type {int} Last exit code of a mode */
+let modeExitCode = 0;
+/** @type {RuntimeProcess} This is the current RuntimeProcess instance */
+let runtimeProcess = null;
+/** @type {IPC} The IPC instance, used to communicate with the script */
+let ipc = null;
+/** @type {EventEmitter} This is used to emit events when things change */
+const eventEmitter = new EventEmitter();
+/** @type {boolean} If this is true, we will not do things the usual way */
+let modeDebuggerActive = false;
+/** @type {string} Should be the modeId the debugger is attached to */
+let modeDebuggerId = null;
+
+eventEmitter.on("proc:exit", (code) => modeExitCode = code);
+
+/**
+ * Check if a path id actually a mode (if it is a folder with a script.py file)
+ *
+ * @param {string} path - Path to check.
+ *
+ * @return {boolean} wether the path points to a valid mode.
+ */
+function isMode(path) {
+ if (!fs.existsSync(path)) { return false; }
+ let folderStat = fs.statSync(path);
+ if (!folderStat.isDirectory()) { return false; }
+ if (!fs.existsSync(path + "/script.py")) { return false; }
+ return true;
+}
+
+/**
+ * Get all ids of modes that can be set.
+ *
+ * @returns {array} All modeids
+ */
+function listModes() {
+ let modeDirs = [
+ ["builtin/", fs.readdirSync(__appdir + "/NeoRuntime/builtin")],
+ ["remote/", fs.readdirSync(__datadir + "/remoteCode")],
+ ["user/", fs.readdirSync(__datadir + "/userCode")]
+ ]
+ let validModes = [];
+ for (modeDir of modeDirs) {
+ for (modeName of modeDir[1]) {
+ let modeId = `${modeDir[0]}${modeName}`;
+ if (isMode(getModePath(modeId))) {
+ validModes.push(modeId);
+ }
+ }
+ }
+ return validModes;
+}
+
+/**
+ * Change mode, stop the old one and start the new one.
+ *
+ * @param {string} _modeId - Id of the mode to change to.
+ *
+ * @return {object} A standardform return object.
+ */
+function setMode(_modeId) {
+ if (modeDebuggerActive && (_modeId != modeDebuggerId)) {
+ return {success: false, reason: "debugger active", detail: "Cannot change mode when debugger is active."}
+ }
+ if (!isMode(getModePath(_modeId))) {
+ console.log(`Invalid mode "${_modeId}".`);
+ return {success: false, reason: "unknown modeId"};
+ }
+ logger.info(`Changing mode to "${_modeId}".`);
+
+ stopMode();
+
+ modeId = _modeId;
+ neoModules.userData.config.activeMode = modeId;
+ eventEmitter.emit("change", "mode", modeId);
+
+ runtimeProcess = new RuntimeProcess(getModePath(_modeId), eventEmitter);
+ startMode();
+
+ return {success: true}
+};
+
+/**
+ * Get current mode
+ *
+ * @return {string} current modeId
+ */
+function currentMode() {
+ return modeId;
+}
+
+/**
+ * Will attempt to stop current mode
+ *
+ * @return {object} A standardform return object.
+ */
+function stopMode(restart=false) {
+ if (modeRunning()) {
+ runtimeProcess.stop(restart);
+ }
+ return {success: true}
+};
+
+/**
+ * Will attempt to start current mode
+ *
+ * @return {object} A standardform return object.
+ */
+function startMode() {
+ if (runtimeProcess === null) { return {success: false, reason: "no runtimeprocess", detail: "Runtimeprocess not set, did you mean to call setMode?"}; }
+ runtimeProcess.start();
+ return {success: true}
+};
+
+/**
+ * Will attempt to restart current mode
+ *
+ * @return {object} A standardform return object.
+ */
+function restartMode() {
+ return stopMode(true);
+};
+
+/**
+ * Checks if mode is running currently
+ *
+ * @return {boolean} if mode is running
+ */
+function modeRunning() {
+ if (runtimeProcess === null) { return false; }
+ return runtimeProcess.isRunning;
+};
+
+/**
+ * Get the full system path to a mode
+ *
+ * @param {string} modeId
+ *
+ * @return {string} Full path of mode
+ */
+function getModePath(modeId) {
+ let path = modeId.split("/");
+ let location = path.splice(0, 1).toString();
+ if (location === "user") { path = __datadir + "/userCode/" + path.join("/"); }
+ if (location === "remote") { path = __datadir + "/remoteCode/" + path.join("/"); }
+ if (location === "builtin") { path = __appdir + "/NeoRuntime/builtin/" + path.join("/"); }
+ return path;
+}
+
+/**
+ * This should be called by RuntimeProcess when a variable changes in the mode
+ *
+ * @param {string} location - This is globvars/variables
+ * @param {string} name - Name of the variable
+ * @param {any} newValue - The new value of the variable
+ */
+function onVariableChange(location, name, newValue) {
+ if (location == "variables") {
+ eventEmitter.emit("change", `variable/${name}`, newValue)
+ } else if (location == "globvars") {
+ eventEmitter.emit("change", `${name}`, newValue)
+ }
+}
+
+/**
+ * Function that returns all globvars (brightness, power_on) as the values they
+ * had last time we heard from the python script.
+ *
+ * @return {object}
+ */
+function getGlobvars() {
+ if (!modeRunning()) { return {}; }
+ return ipc.globvars;
+}
+
+/**
+ * Sets value of a globvar power_on/brightness.
+ *
+ * @param {string} name - Name of the variable power_on/brightness
+ * @param {any} value - The value the variable should be set to
+ *
+ * @return {object} Standardform return object
+ */
+function setGlobvar(name, value) {
+ if (!modeRunning()) { return; }
+
+ switch(name) {
+ case "power_on":
+ return ipc.sendCommand(IPC.COMMAND.SET_GLOB, IPC.GLOBVAR.POWER_ON, (value) ? 1 : 0);
+ case "brightness":
+ return ipc.sendCommand(IPC.COMMAND.SET_GLOB, IPC.GLOBVAR.BRIGHTNESS, value);
+ default:
+ return {success: false, reason: "unknown globvar", detail: name};
+ }
+}
+
+/**
+ * Get all variables declared in mode
+ *
+ * @return {object}
+ */
+function getVariables() {
+ if (!modeRunning()) { return {}; }
+ return ipc.variables;
+}
+
+/**
+ * Sets value of a variable
+ *
+ * @param {string} name - Name of the variable
+ * @param {any} value - The value the variable should be set to
+ *
+ * @return {object} Standardform return object
+ */
+function setVariable(name, value) {
+ if (!modeRunning()) { return; }
+ return ipc.sendCommand(IPC.COMMAND.SET_VAR, name, value);
+}
+
+/**
+ * Start debugger for a mode
+ *
+ * @param {string} modeId - The mode to debug
+ *
+ * @return {object} Standardform return object
+ */
+function startDebugger(debuggerModeId) {
+ if (debuggerModeId.substr(0, 5) !== "user/") { return {success: false, reason: "not user mode"}; }
+ if (!isMode(getModePath(debuggerModeId))) { return {success: false, reason: "unknown modeId"}; }
+ if (modeDebuggerActive) { return {success: false, reason: "debugger already active"}; }
+ logger.info(`Starting debugger for ${debuggerModeId}`);
+ modeDebuggerActive = true;
+ modeDebuggerId = debuggerModeId;
+ if (debuggerModeId != modeId) {
+ setMode(debuggerModeId);
+ } else {
+ restartMode();
+ }
+ return {success: true, code: fs.readFileSync(getModePath(debuggerModeId) + "/script.py").toString()}
+}
+
+/**
+ * Save mode
+ */
+function saveModeCode(_modeId, code) {
+ if (!modeDebuggerActive) { return {success: false, reason: "debugger not active"}; };
+ if (_modeId != modeDebuggerId) { return {success: false, reason: "modeid not the same as debuggermodeid"}; };
+ fs.writeFileSync(getModePath(`${modeDebuggerId}/script.py`), code);
+ return {success: true};
+}
+
+/**
+ * Stop the active debugger
+ *
+ * @return {object} Standardform return object
+ */
+function stopDebugger() {
+ if (!modeDebuggerActive) { return {success: true, detail: "No debugger active"} }
+ logger.info(`Stopping debugger`);
+ modeDebuggerActive = false;
+ return {success: true}
+}
+
+module.exports = (_neoModules) => {
+ neoModules = _neoModules;
+ ipc = new IPC.IPC(neoModules.userData.config.neoRuntimeIPC.socketFile, eventEmitter);
+ return {
+ event: eventEmitter,
+ modes: listModes,
+ mode: {
+ current: currentMode,
+ set: (modeId) => setMode(modeId),
+ status: {
+ modeRunning: modeRunning(),
+ modeExitCode: modeExitCode
+ },
+ globvars: {
+ get: getGlobvars,
+ set: setGlobvar
+ },
+ variables: {
+ get: getVariables,
+ set: setVariable
+ }
+ },
+ getModePath,
+ isMode,
+ modeRunning,
+ startDebugger, stopDebugger, saveModeCode,
+ startMode, stopMode, restartMode
+ }
+};