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/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* vim: set sts=2 sw=2 et tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
/* exported BasePipe, BaseProcess, debug */
/* globals Process, io */
function debug(message) {
self.postMessage({msg: "debug", message});
}
class BasePipe {
constructor() {
this.closing = false;
this.closed = false;
this.closedPromise = new Promise(resolve => {
this.resolveClosed = resolve;
});
this.pending = [];
}
shiftPending() {
let result = this.pending.shift();
if (this.closing && this.pending.length == 0) {
this.close();
}
return result;
}
}
let nextProcessId = 0;
class BaseProcess {
constructor(options) {
this.id = nextProcessId++;
this.exitCode = null;
this.exitPromise = new Promise(resolve => {
this.resolveExit = resolve;
});
this.exitPromise.then(() => {
// The input file descriptors will be closed after poll
// reports that their input buffers are empty. If we close
// them now, we may lose output.
this.pipes[0].close(true);
});
this.pid = null;
this.pipes = [];
this.stringArrays = [];
this.spawn(options);
}
/**
* Waits for the process to exit and all of its pending IO operations to
* complete.
*
* @returns {Promise<void>}
*/
awaitFinished() {
return Promise.all([
this.exitPromise,
...this.pipes.map(pipe => pipe.closedPromise),
]);
}
/**
* Creates a null-terminated array of pointers to null-terminated C-strings,
* and returns it.
*
* @param {string[]} strings
* The strings to convert into a C string array.
*
* @returns {ctypes.char.ptr.array}
*/
stringArray(strings) {
let result = ctypes.char.ptr.array(strings.length + 1)();
let cstrings = strings.map(str => ctypes.char.array()(str));
for (let [i, cstring] of cstrings.entries()) {
result[i] = cstring;
}
// Char arrays used in char arg and environment vectors must be
// explicitly kept alive in a JS object, or they will be reaped
// by the GC if it runs before our process is started.
this.stringArrays.push(cstrings);
return result;
}
}
let requests = {
init(details) {
io.init(details);
return {data: {}};
},
shutdown() {
io.shutdown();
return {data: {}};
},
close(pipeId, force = false) {
let pipe = io.getPipe(pipeId);
return pipe.close(force).then(() => ({data: {}}));
},
spawn(options) {
let process = new Process(options);
let processId = process.id;
io.addProcess(process);
let fds = process.pipes.map(pipe => pipe.id);
return {data: {processId, fds, pid: process.pid}};
},
kill(processId, force = false) {
let process = io.getProcess(processId);
process.kill(force ? 9 : 15);
return {data: {}};
},
wait(processId) {
let process = io.getProcess(processId);
process.wait();
process.awaitFinished().then(() => {
io.cleanupProcess(process);
});
return process.exitPromise.then(exitCode => {
return {data: {exitCode}};
});
},
read(pipeId, count) {
let pipe = io.getPipe(pipeId);
return pipe.read(count).then(buffer => {
return {data: {buffer}};
});
},
write(pipeId, buffer) {
let pipe = io.getPipe(pipeId);
return pipe.write(buffer).then(bytesWritten => {
return {data: {bytesWritten}};
});
},
getOpenFiles() {
return {data: new Set(io.pipes.keys())};
},
getProcesses() {
let data = new Map(Array.from(io.processes.values())
.filter(proc => proc.exitCode == null)
.map(proc => [proc.id, proc.pid]));
return {data};
},
waitForNoProcesses() {
return Promise.all(Array.from(io.processes.values(),
proc => proc.awaitFinished()));
},
};
onmessage = event => {
io.messageCount--;
let {msg, msgId, args} = event.data;
new Promise(resolve => {
resolve(requests[msg](...args));
}).then(result => {
let response = {
msg: "success",
msgId,
data: result.data,
};
self.postMessage(response, result.transfer || []);
}).catch(error => {
if (error instanceof Error) {
error = {
message: error.message,
fileName: error.fileName,
lineNumber: error.lineNumber,
column: error.column,
stack: error.stack,
errorCode: error.errorCode,
};
}
self.postMessage({
msg: "failure",
msgId,
error,
});
}).catch(error => {
console.error(error);
self.postMessage({
msg: "failure",
msgId,
error: {},
});
});
};
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