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12 changes: 12 additions & 0 deletions
12
src/engine/native/node/native-script-execution/package.json
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,12 @@ | ||
| { | ||
| "name": "@proceed/native-script-execution", | ||
| "version": "1.0.0", | ||
| "description": "Native module that executes scripts in a subprocess", | ||
| "main": "src/index.js", | ||
| "author": "PROCEED Project", | ||
| "license": "MIT", | ||
| "dependencies": { | ||
| "@proceed/native-module": "^1.0.0", | ||
| "isolated-vm": "^5.0.1" | ||
| } | ||
| } |
172 changes: 172 additions & 0 deletions
172
src/engine/native/node/native-script-execution/src/childProcess.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,172 @@ | ||
| const ivm = require('isolated-vm'); | ||
|
|
||
| const [ | ||
| processId, | ||
| processInstanceId, | ||
| scriptIdentifier, | ||
| tokenId, | ||
| scriptString, | ||
| token, | ||
| processCommunicationAdress, | ||
| ] = process.argv.slice(2); | ||
|
|
||
| if ( | ||
| !processId || | ||
| !processInstanceId || | ||
| !scriptIdentifier || | ||
| !tokenId || | ||
| !scriptString || | ||
| !token || | ||
| !processCommunicationAdress | ||
| ) | ||
| throw new Error( | ||
| 'Expected the following args processId, processInstanceId, tokenId, scriptString, token', | ||
| ); | ||
|
|
||
| async function callToExecutor(endpoint, body) { | ||
| try { | ||
| const response = await fetch( | ||
| `${processCommunicationAdress}/${processId}/${processInstanceId}/${scriptIdentifier}/${endpoint}`, | ||
| { | ||
| method: 'POST', | ||
| body: JSON.stringify(body), | ||
| headers: { | ||
| ['content-type']: 'application/json', | ||
| authorization: `Bearer ${token}`, | ||
| }, | ||
| }, | ||
| ); | ||
|
|
||
| if (!response.ok) throw new Error(`${endpoint}: Response not ok`); | ||
|
|
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| const contentType = response.headers.get('content-type'); | ||
|
|
||
| if (!contentType) { | ||
| return; | ||
| } else if (contentType.includes('application/json')) { | ||
| const json = await response.json(); | ||
| return 'result' in json ? json.result : json; | ||
| } else { | ||
| return await response.text(); | ||
| } | ||
| } catch (e) { | ||
| console.error(e); | ||
|
|
||
| if (endpoint === 'result') process.exit(1); | ||
| } | ||
| } | ||
|
|
||
| const isolate = new ivm.Isolate({ memoryLimit: 128 }); | ||
| const context = isolate.createContextSync(); | ||
|
|
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| context.global.setSync('global', context.global.derefInto()); | ||
|
|
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| context.global.setSync('_stdout_log', function (...args) { | ||
| console.log(...args); | ||
| }); | ||
|
|
||
| // NOTE: Extern capabilities (provided by neo-engine) | ||
| // log, console, variable, getService, BpmnEscalation, BpmnError | ||
| // TODO: pass these in as a process argument | ||
|
|
||
| // TODO: setProgress(<number between 0 - 100>) | ||
| // TODO: getService('capabilities') | ||
| // TODO: getService('network') | ||
|
|
||
| const structure = { | ||
| log: ['get'], | ||
| console: ['trace', 'debug', 'info', 'warn', 'error', 'log', 'time', 'timeEnd'], | ||
| variable: ['get', 'set', 'getAll'], | ||
| }; | ||
|
|
||
| for (const objName of Object.keys(structure)) { | ||
| const functionNames = structure[objName]; | ||
|
|
||
| context.evalSync(`globalThis["${objName}"] = {}`); | ||
|
|
||
| // NOTE: maybe replace JSON for isolated-vm solution | ||
| for (const functionName of functionNames) { | ||
| context.evalClosureSync( | ||
| `globalThis["${objName}"]["${functionName}"] = function (...args) { | ||
| return $0.applySyncPromise(null, [JSON.stringify(args)], {}).copyInto(); | ||
| }`, | ||
| [ | ||
| new ivm.Reference(async function (args) { | ||
| const result = await callToExecutor('call', { | ||
| functionName: `${objName}.${functionName}`, | ||
| args: JSON.parse(args), | ||
| }); | ||
|
|
||
| return new ivm.ExternalCopy(result); | ||
| }), | ||
| ], | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| const errorClasses = ['BpmnError', 'BpmnEscalation']; | ||
|
|
||
| for (const errorName of errorClasses) | ||
| context.evalClosureSync( | ||
| `class ${errorName} { | ||
| constructor(...args) { | ||
| this.errorArgs = args; | ||
| this.errorClass = '${errorName}'; | ||
| } | ||
| } | ||
| globalThis["${errorName}"] = ${errorName}; | ||
| `, | ||
| ); | ||
|
|
||
| function wrapScriptWithErrorHandling(script) { | ||
| return `try { | ||
| ${script} | ||
| } catch(e){ | ||
| if(${errorClasses.map((error) => 'e instanceof ' + error).join(' || ')}) | ||
| throw JSON.stringify(e); | ||
| else throw e; | ||
| } | ||
| `; | ||
| } | ||
|
|
||
| const sleep = new ivm.Reference((ms) => new Promise((res) => setTimeout(res, ms))); | ||
|
|
||
| context.evalClosureSync( | ||
| async function setTimeoutAsync(cb, ms) { | ||
| await $0.apply(null, [ms], { result: { promise: true } }); | ||
| cb(); | ||
| }.toString() + `globalThis["setTimeoutAsync"] = setTimeoutAsync;`, | ||
| [sleep], | ||
| ); | ||
|
|
||
| context.evalClosureSync( | ||
| async function setIntervalAsync(cb, ms) { | ||
| do { | ||
| await $0.apply(null, [ms], { result: { promise: true } }); | ||
| } while (!(await cb())); | ||
| }.toString() + 'globalThis["setIntervalAsync"]=setIntervalAsync;', | ||
| [sleep], | ||
| ); | ||
|
|
||
| function wrapScriptInAsyncFunction(script) { | ||
| return `async function main() { ${script} }; main();`; | ||
| } | ||
|
|
||
| context | ||
| .eval(wrapScriptInAsyncFunction(wrapScriptWithErrorHandling(scriptString)), { | ||
| promise: true, | ||
| externalCopy: true, | ||
| }) | ||
| .then((result) => { | ||
| callToExecutor('result', { result: result.copy() }); | ||
| }) | ||
| .catch((err) => { | ||
| let result = err; | ||
| try { | ||
| result = JSON.parse(err); | ||
| } catch (_) {} | ||
|
|
||
| console.error(result); | ||
|
|
||
| callToExecutor('result', { result }).finally(() => process.exit(1)); | ||
| }); |
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