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GPII Process Reporter processes bridge, a component that encapsulates common
functions for retrieving information about OS processes with no requirement for
native (e.g., linux or windows) OS access.
Copyright 2014 Inclusive Design Research Centre, OCAD University
Licensed under the New BSD license. You may not use this file except in
compliance with this License.
You may obtain a copy of the License at
https://github.com/gpii/universal/LICENSE.txt
*/
"use strict";
var fluid = fluid || require("infusion");
var gpii = fluid.registerNamespace("gpii");
fluid.defaults("gpii.processes", {
gradeNames: ["fluid.component", "fluid.contextAware"],
contextAwareness: {
platform: {
checks: {
linux: {
contextValue: "{gpii.context.linux}",
gradeNames: "gpii.processes.linux"
},
windows: {
contextValue: "{gpii.context.windows}",
gradeNames: "gpii.processes.windows"
}
}
}
},
invokers: {
findSolutionsByCommands: {
funcName: "gpii.processes.findSolutionsByCommands",
args: ["{that}", "{arguments}.0"]
// array of command names
},
findSolutionsByPids: {
funcName: "gpii.processes.findSolutionsByPids",
args: ["{that}", "{arguments}.0"]
// array of pids (process ids)
},
findProcessByPid: {
funcName: "gpii.processes.findProcessByPid",
args: ["{that}", "{arguments}.0", "{arguments}.1"]
// pid, procArray (optional)
},
findProcessesByCommand: {
funcName: "gpii.processes.findProcessesByCommand",
args: ["{that}", "{arguments}.0", "{arguments}.1"]
// command, procArray (optional)
},
findFirstProcessByCommand: {
funcName: "gpii.processes.findFirstProcessByCommand",
args: ["{that}", "{arguments}.0", "{arguments}.1"]
// command, procArray (optional)
},
isRunning: {
funcName: "gpii.processes.isRunning",
args: ["{that}", "{arguments}.0"]
// state (string)
},
updateProcInfo: {
funcName: "gpii.processes.updateProcInfo",
args: ["{that}", "{arguments}.0"]
// process info structure
},
initProcInfoNotRunning: {
funcName: "gpii.processes.initProcInfoNotRunning",
args: ["{that}", "{arguments}.0"]
// command name (string)
},
// Context aware invokers.
getProcessList : {
funcName: "gpii.processes.getProcessList",
args: ["{arguments}.0"]
// optional string or numeric identifier of the process
}
}
});
/**
* Return a list of process information objects corresponding to the names
* of each of the passed in commands. If nothing is found, returns an empty
* array.
*
* @param that {Component} - an instance of a processes component.
* @param commandNames {Array of String} - the names of the processes to inspect.
* @return {Array} - Array of procInfo objects for each command name. Empty
* if no processes are found.
*/
gpii.processes.findSolutionsByCommands = function (that, commandNames) {
return fluid.accumulate(commandNames, function (aCommand, matches) {
var procInfos = that.findProcessesByCommand(aCommand);
matches = matches.concat(procInfos);
return matches;
}, []);
};
/**
* Return an list of process information objects corresponding to the
* pids (process id numbers) passed in. If nothing is found, returns an empty
* array.
*
* @param that {Component} - an instance of a processes component.
* @param pids {Array of Number} - the process ids of the processes to inspect.
* @return {Array of ProcInfo} - Array of procInfo objects for each pid. Empty
* if no corresponding processes are found.
*/
gpii.processes.findSolutionsByPids = function (that, pids) {
return fluid.accumulate(pids, function (aPid, matches) {
var found = that.findProcessByPid(aPid);
Eif (found !== null) {
matches.push(found);
}
return matches;
}, []);
};
/**
* Return a process information object corresponding to THE given process
* id (process id number). Returns null if there is no such process.
*
* @param that {Component} - an instance of a processes component.
* @param pid {Number} - the process id of the processe to inspect.
* @param procArray {Array of ProcInfo} [optional] - an array of process information
* objects to search.
* @return {ProcInfo} - A process information object for the process with the
* given id. Returns null if there is no such process.
*/
gpii.processes.findProcessByPid = function (that, pid, procArray) {
if (!procArray) {
procArray = that.getProcessList(pid);
}
return fluid.find(procArray, function (procInfo) {
if (procInfo.pid === pid) {
return procInfo;
}
}, null);
};
/**
* Return a list of process information objects that match the given
* command name. Return san empty array if not matching name is found.
*
* @param that {Component} - an instance of a processes component.
* @param commandName {String} - the name of the processe to inspect.
* @param procArray {Array of ProcInfo} [optional] - an array of process information
* objects to search.
* @return {Array of ProcInfo} - Array of procInfo objects matching the command name. Empty
* if no corresponding processes are found.
*/
gpii.processes.findProcessesByCommand = function (that, commandName, procArray) {
Eif (!procArray) {
procArray = that.getProcessList(commandName);
}
return fluid.accumulate(procArray, function (aProcInfo, matchingProcs) {
if (aProcInfo.command === commandName) {
matchingProcs.push(aProcInfo);
}
return matchingProcs;
}, []);
};
/**
* Return the first process of an array of processes all with the same
* command name. If there are no matching names, return null.
*
* @param that {Component} - an instance of a processes component.
* @param commandName {String} - the name of the processe to inspect.
* @param procArray {Array of ProcInfo} [optional] - an array of process information
* objects to search.
* @return {Object} - A process information object for the process with the
* given id, null if there is no such process.
*/
gpii.processes.findFirstProcessByCommand = function (that, commandName, procArray) {
var commands = that.findProcessesByCommand(commandName, procArray);
Eif (commands.length > 0) {
return commands[0];
}
else {
return null;
}
};
// Map to reduce process state values into "Running" (= true) vs. "Not Running"
// (= false).
gpii.processes.stateToRunning = fluid.freezeRecursive({
"Running": true,
"Uninterruptible": true,
"Sleeping": true,
"Stopped": true,
"Zombie": false,
"NoSuchProcess": false
});
/**
* Determine if a process is running based on its native state.
*
* @param that {Component} - an instance of a processes component.
* @param state {String} - Native state of the process
* @return {Boolean} - Returns true if the process is running, false otherwise.
*/
gpii.processes.isRunning = function (that, state) {
return gpii.processes.stateToRunning[state];
};
/**
* Renew the information about a process, or create a new "no such process"
* information object.
*
* @param that {Component} - an instance of a processes component.
* @param procInfo {ProcInfo} - Latest information about a process.
* @return {ProcInfo} - Returns a new process information object about the process.
*/
gpii.processes.updateProcInfo = function (that, procInfo) {
var newProcInfo = null;
Iif (procInfo.state === "NoSuchProcess") {
newProcInfo =
that.findFirstProcessByCommand(procInfo.command);
}
else {
newProcInfo = that.findProcessByPid(procInfo.pid);
}
if (newProcInfo === null) {
newProcInfo =
that.initProcInfoNotRunning(procInfo.command);
}
return newProcInfo;
};
/**
* Create process information object for a not-running process.
*
* @param that {Component} - an instance of a processes component.
* @param command {String} - Name of the process.
* @return {ProcInfo} - Returns a new process information object initialized as
* if the process is not running.
*/
gpii.processes.initProcInfoNotRunning = function (that, command) {
return fluid.freezeRecursive({
"command": command,
"pid": -1,
"ppid": -1,
"uid": -1,
"gid": -1,
"fullPath": "",
"argv": "",
"state": "NoSuchProcess"
});
};
/**
* Default function for the base 'gpii.processes' grade to return an empty list
* of process information objects.
*
* @param identifier {Number} or {String} - Optional process id number or
* command name of the process.
* @return {Array} - Returns an empty list.
*/
gpii.processes.getProcessList = function (/* identifier */) {
return [];
};
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