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worker.ts
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266 lines (249 loc) · 7.05 KB
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import * as child from "child_process";
import crypto from "crypto";
import fs from "fs";
import path from "path";
import {
CodeContext,
ContainerInitialization,
JobStatus,
WriteFileStatus,
language,
fileFormat,
ExecuteContainer,
Stdout,
} from "./types/worker";
import { containerCPULimit, containerMemLimit, mainClassName } from "./config";
const fileFormats: Record<language, fileFormat> = {
python3: "py",
javascript: "js",
};
class JobWorker {
public language: language;
public codeContext: CodeContext;
public filename: string;
public containerID: string;
constructor(language: language, codeContext: CodeContext) {
this.language = language;
this.codeContext = codeContext;
this.filename = "";
this.containerID = "";
}
/**
* Creates an appropriate docker container
* to execute the target code
*/
createContainer(): Promise<ContainerInitialization> {
return new Promise((resolve, reject) => {
if (!(this.language in fileFormats)) {
reject({
error: true,
errorMessage: "Invalid language name.",
});
}
const initCommand = `docker create ${containerMemLimit} ${containerCPULimit} ${this.language}`;
child.exec(initCommand, (error, containerID, stderr) => {
if (error) {
reject({
error: true,
errorMessage: error.message,
});
} else if (stderr) {
reject({
error: true,
errorMessage: stderr,
});
} else {
this.containerID = containerID.trim();
resolve({
error: false,
containerID: this.containerID,
});
}
});
});
}
/**
* Returns a piece of code that executes the class method
* this is language specific, so defined using switch cases
*/
transformCodeIntoExecutable(): string {
switch (this.language) {
case "python3": {
return `\nprint(${mainClassName}().${this.codeContext.functionName}())`;
}
default:
return "";
}
}
/**
* writes a code into a temp file
*/
private async writeFile(): Promise<WriteFileStatus> {
return new Promise((resolve, reject) => {
const fileFormat: string = fileFormats[this.language];
this.filename = `${crypto.randomBytes(32).toString("hex")}.${fileFormat}`;
const filePath = path.join(__dirname, "..", "temp", `${this.filename}`);
// appending a line to execute a specific function
this.codeContext.code += this.transformCodeIntoExecutable();
fs.writeFile(filePath, this.codeContext.code, (error) => {
if (error) {
reject(error.message);
} else {
resolve({ filePath, fileFormat });
}
});
});
}
/**
* copies the target code into the newly created
* isolated container
*/
copyContext(): Promise<string> {
return new Promise(async (resolve, reject) => {
if (!this.containerID) {
reject("ContainerID not found.");
}
this.writeFile()
.then(({ filePath, fileFormat }) => {
const initCommand = `docker cp ${filePath} ${this.containerID}:/src/target.${fileFormat}`;
child.exec(initCommand, (error, containerID, stderr) => {
if (error) {
reject(error.message);
} else if (stderr) {
reject(stderr);
} else {
resolve(containerID.trim());
}
});
})
.catch((e) => {
reject(e);
});
});
}
/**
* Excecutes phase 1
* 1] Creates a new container
* 2] Copies the code into the contaienr
*/
initContainer(): Promise<JobStatus> {
return new Promise(async (resolve, reject) => {
this.createContainer()
.then(() => {
this.copyContext()
.then(() => {
resolve({
message: `Job has succeeded.`,
error: false,
retryable: true,
});
})
.catch((e) => {
reject({
message: e,
error: true,
retryable: true,
});
});
})
.catch(({errorMessage}) => {
reject({
message: errorMessage,
error: true,
retryable: true,
});
});
});
}
/**
* Executes phase 2
* 1] Spin up the container
* 2] Record the output from the container
*/
async startContainer(): Promise<ExecuteContainer> {
return new Promise((resolve, reject) => {
this.initContainer()
.then((jobStatus: JobStatus) => {
if (!jobStatus.error && this.containerID) {
const startContainer = `docker start -a ${this.containerID}`;
child.exec(startContainer, (error, stdout, stderr) => {
if (error) {
reject({
error: true,
errorMessage: error.message,
} as ExecuteContainer);
} else if (stderr) {
reject({
error: true,
errorMessage: stderr,
} as ExecuteContainer);
} else {
resolve({
error: false,
codeOutput: stdout.trim(),
} as ExecuteContainer);
}
});
} else {
// job failed
reject({
error: true,
errorMessage: `Job has failed in the process of initializing the container for the following reason(s): ${jobStatus.message}`,
} as ExecuteContainer);
}
})
.catch((_) => {});
});
}
/**
* Removes a container with the provided containerID
*/
async removeContainer(): Promise<Stdout> {
return new Promise((resolve, reject) => {
if (!this.containerID) {
reject("ContainerID not found.");
}
const removeContainer = `docker rm --force ${this.containerID}`;
child.exec(removeContainer, (error, stdout, stderr) => {
if (error) {
reject(error.message);
} else if (stderr) {
reject(stderr);
} else {
resolve(stdout);
}
});
});
}
/**
* Deletes the temp file in /temp folder
*/
async removeCacheFile(): Promise<Stdout> {
return new Promise((resolve, reject) => {
if (!this.filename) {
return reject("Filename not found.");
}
const removeContainer = `rm ${__dirname}/../temp/${this.filename}`;
child.exec(removeContainer, (error, stdout, stderr) => {
if (error) {
reject(error.message);
} else if (stderr) {
reject(stderr);
} else {
resolve(stdout);
}
});
});
}
/**
* Cleans up the job
* Destroys the docker container & deletes cache files
*/
async cleanupJob(): Promise<any> {
const jobs: Promise<any>[] = [];
jobs.push(this.removeContainer());
jobs.push(this.removeCacheFile());
return Promise.all(jobs);
}
}
export default JobWorker;