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chore(android): implement remote snapshot generation
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Gary Mathews
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Dec 7, 2019
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,114 +1,74 @@ | ||
| 'use strict'; | ||
|
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| const promisify = require('util').promisify; | ||
| const exec = require('child_process').execFile; // eslint-disable-line security/detect-child-process | ||
| const os = require('os'); | ||
| const fs = require('fs-extra'); | ||
| const path = require('path'); | ||
| const ejs = require('ejs'); | ||
| const request = require('request-promise-native'); | ||
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| const ROOT_DIR = path.join(__dirname, '..', '..', '..'); | ||
| const DIST_DIR = path.join(ROOT_DIR, 'dist'); | ||
| const TMP_DIR = path.join(DIST_DIR, 'tmp'); | ||
| const ANDROID_DIR = path.join(ROOT_DIR, 'android'); | ||
| const ANDROID_PROPS = require(path.join(ANDROID_DIR, 'package.json')); // eslint-disable-line security/detect-non-literal-require | ||
| const V8_PROPS = ANDROID_PROPS.v8; | ||
| const V8_LIB_DIR = path.join(ROOT_DIR, 'dist', 'android', 'libv8', V8_PROPS.version, V8_PROPS.mode, 'libs'); | ||
|
|
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| // Obtain target architectures | ||
| const TARGETS = []; | ||
| for (const target of ANDROID_PROPS.architectures) { | ||
| if (target === 'arm64-v8a') { | ||
| TARGETS.push('arm64'); | ||
| } else if (target === 'armeabi-v7a') { | ||
| TARGETS.push('arm'); | ||
| } else { | ||
| TARGETS.push(target); | ||
| } | ||
| } | ||
|
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| /** | ||
| * Runs mksnapshot to generate snapshots for each architecture | ||
| * @param {string} target targets to generate blob | ||
| * Generates empty snapshot blobs for each supported architecture | ||
| * and creates a header to include the snapshots at build time. | ||
| * @returns {Promise<void>} | ||
| */ | ||
| async function generateBlob(target) { | ||
| const V8_LIB_TARGET_DIR = path.resolve(V8_LIB_DIR, target); | ||
| const MKSNAPSHOT_PATH = path.join(V8_LIB_TARGET_DIR, 'mksnapshot'); | ||
| const BLOB_PATH = path.join(V8_LIB_TARGET_DIR, 'blob.bin'); | ||
| const STARTUP_PATH = path.join(TMP_DIR, 'startup.js'); | ||
| const TI_MAIN_PATH = path.join(ROOT_DIR, 'common', 'Resources', 'ti.main.js'); | ||
| const TI_MAIN_PLATFORM_PATH = path.join(TMP_DIR, 'common', 'android', 'ti.main.js'); | ||
| const args = [ | ||
| '--startup_blob=' + BLOB_PATH, | ||
| STARTUP_PATH, | ||
| '--print-all-exceptions' | ||
| ]; | ||
|
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||
| // Snapshot already exists, skip... | ||
| if (await fs.exists(BLOB_PATH)) { | ||
| const { blobStat, commonStat } = await Promise.all([ fs.stat(BLOB_PATH), fs.stat(TI_MAIN_PATH) ]); | ||
| if (commonStat && blobStat && commonStat.mtime < blobStat.mtime) { | ||
| return; | ||
| } | ||
| } | ||
| async function build() { | ||
| const v8 = V8_PROPS.version; | ||
| const script = (await fs.readFile(path.join(TMP_DIR, 'common', 'android', 'ti.main.js'))).toString(); | ||
|
|
||
| // Load platform optimized 'common' bundle | ||
| const commonBundle = await fs.readFile(TI_MAIN_PLATFORM_PATH); | ||
| return new Promise(async resolve => { // eslint-disable-line no-async-promise-executor | ||
|
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||
| // Generate 'startup.js' | ||
| const output = await promisify(ejs.renderFile)(path.join(__dirname, 'startup.ejs'), { script: commonBundle }, {}); | ||
| await fs.writeFile(STARTUP_PATH, output); | ||
| console.log('Attempting to request snapshot...'); | ||
|
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| // Set correct permissions for 'mksnapshot' | ||
| await fs.chmod(MKSNAPSHOT_PATH, 0o755); | ||
| // Obtain snapshot `id` and start new snapshot generation. | ||
| const id = await request.post('http://52.10.192.87', { body: { v8, script }, json: true }); | ||
|
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| console.warn(`Generating snapshot blob for ${target}...`); | ||
| async function getSnapshot() { | ||
|
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| // Generate snapshot | ||
| return promisify(exec)(MKSNAPSHOT_PATH, args).catch(e => console.warn(`Could not generate blob for ${target}: ${e.message}`)); | ||
| } | ||
| // Request generated snapshot. | ||
| const header = await request.get(`http://52.10.192.87/snapshot/${id}`, { | ||
| simple: false, | ||
| resolveWithFullResponse: true | ||
| }); | ||
|
|
||
| /** | ||
| * Generates V8Snapshots.h header from architecture blobs | ||
| * @returns {Promise<void>} | ||
| */ | ||
| async function generateHeader() { | ||
| const blobs = {}; | ||
| if (header.statusCode === 200) { | ||
| console.log('Writing snapshot...'); | ||
|
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| // Load snapshots for each architecture | ||
| await Promise.all(TARGETS.map(async target => { | ||
| const V8_LIB_TARGET_DIR = path.resolve(V8_LIB_DIR, target); | ||
| const BLOB_PATH = path.join(V8_LIB_TARGET_DIR, 'blob.bin'); | ||
| // Overwrite stub snapshot header. | ||
| await fs.writeFile(path.join(ANDROID_DIR, 'runtime', 'v8', 'src', 'native', 'V8Snapshots.h'), header.body); | ||
|
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| if (await fs.exists(BLOB_PATH)) { | ||
| blobs[target] = Buffer.from(await fs.readFile(BLOB_PATH, 'binary'), 'binary'); | ||
| } | ||
| })); | ||
| // Done. Resolve `build` promise. | ||
| resolve(); | ||
|
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| console.log(`Generating V8Snapshots.h for ${Object.keys(blobs).join(', ')}...`); | ||
| } else if (header.statusCode === 418) { | ||
| console.log('Waiting for snapshot generation...'); | ||
|
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||
| // Generate 'V8Snapshots.h' from template | ||
| const output = await promisify(ejs.renderFile)(path.join(__dirname, 'V8Snapshots.h.ejs'), { blobs }, {}); | ||
| return fs.writeFile(path.join(ANDROID_DIR, 'runtime', 'v8', 'src', 'native', 'V8Snapshots.h'), output); | ||
| } | ||
| // Snapshot server is still building, wait for next interval. | ||
| return false; | ||
|
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||
| /** | ||
| * Generates empty snapshot blobs for each supported architecture | ||
| * and creates a header to include the snapshots at build time. | ||
| * NOTE: SNAPSHOT GENERATION IS ONLY SUPPORTED ON macOS | ||
| * @returns {Promise<void>} | ||
| */ | ||
| async function build() { | ||
| // Only macOS is supports creating snapshots | ||
| if (os.platform() !== 'darwin') { | ||
| console.warn('Snapshot generation is only supported on macOS, skipping...'); | ||
| return; | ||
| } | ||
|
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| // Generate snapshots in parallel | ||
| await Promise.all(TARGETS.map(target => generateBlob(target))); | ||
| return generateHeader(); | ||
| } else { | ||
| console.error('Could not generate snapshot, skipping...'); | ||
| } | ||
|
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| // Prevent retry interval. | ||
| return true; | ||
| } | ||
|
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| // Attempt to grab generated snapshot. | ||
| if (!await getSnapshot()) { | ||
|
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| // Retry until snapshot generation finishes. | ||
| const interval = setInterval(async () => { | ||
| if (await getSnapshot()) { | ||
| clearInterval(interval); | ||
| } | ||
| }, 5000); | ||
| } | ||
| }); | ||
| } | ||
|
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| module.exports = { build }; |
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