awscdk-construct-hls-session-runner
Version:
AWS CDK construct for deploying a Lambda function and SFN state machines to fetch an HLS manifest
90 lines • 13 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.handler = handler;
const HLS = require("hls-parser"); // For reading/writing the HLS manifest
const node_fetch_1 = require("node-fetch"); // For making a request to the origin
const util_1 = require("./util");
const HLS_ENDPOINT_URL = process.env.HLS_ENDPOINT_URL;
const REQUEST_HEADERS = JSON.parse(process.env.REQUEST_HEADERS);
const INDEX_OF_RENDITIONS = Number.parseInt(process.env.INDEX_OF_RENDITIONS, 10);
const SESSION_REQUIREMENTS = JSON.parse(process.env.SESSION_REQUIREMENTS);
const EVENT_START_TIME = new Date(process.env.EVENT_START_TIME);
const SEGMENT_REQUEST = process.env.SEGMENT_REQUEST === 'true';
HLS.setOptions({ silent: true }); // Surpress the error message
async function handler(event) {
const urlList = event.urlList;
const desiredSessionVolume = (0, util_1.getDesiredSessionVolume)(EVENT_START_TIME, SESSION_REQUIREMENTS.graph);
console.log(`Desired session volume: ${desiredSessionVolume}`);
if (urlList.length < desiredSessionVolume) {
const createNum = desiredSessionVolume - urlList.length;
for (let i = 0; i < createNum; i++) {
const url = await getRenditionUrl(HLS_ENDPOINT_URL, INDEX_OF_RENDITIONS);
urlList.push(url);
}
}
else {
urlList.length = desiredSessionVolume;
}
for (const url of urlList) {
if (SEGMENT_REQUEST) {
await getLastSegment(url);
}
else {
await getPlaylist(url, false);
}
}
return { urlList, timestamp: new Date().toISOString() };
}
async function getRenditionUrl(masterPlaylistUrl, index) {
const playlist = await getPlaylist(masterPlaylistUrl);
if (!playlist || !playlist.isMasterPlaylist) {
console.error('Failed to fetch the master playlist');
return undefined;
}
const masterPlaylist = playlist;
if (masterPlaylist.variants.length === 0) {
console.error('No variant found in the master playlist');
return undefined;
}
return (0, util_1.getAbsoluteUrl)(masterPlaylistUrl, masterPlaylist.variants[index].uri);
}
async function getLastSegment(playlistUrl) {
const playlist = await getPlaylist(playlistUrl);
if (!playlist || playlist.isMasterPlaylist) {
console.error('Failed to fetch the media playlist');
return undefined;
}
const mediaPlaylist = playlist;
if (mediaPlaylist.segments.length === 0) {
console.error('No segments found in the media playlist');
return undefined;
}
const lastSegmentUrl = (0, util_1.getAbsoluteUrl)(playlistUrl, mediaPlaylist.segments[mediaPlaylist.segments.length - 1].uri);
return void fetchUrl(lastSegmentUrl); // Don't wait for the response
}
async function getPlaylist(url, parse = true) {
const txt = await fetchUrl(url, true);
if (txt && parse) {
return HLS.parse(txt);
}
return txt;
}
async function fetchUrl(url, returnText = false) {
const headers = process.env.DISABLE_REQUEST_HEADERS === 'true' ? {} : REQUEST_HEADERS;
if (!returnText) {
return void (0, node_fetch_1.default)(url, {
method: 'GET',
headers,
});
}
const res = await (0, node_fetch_1.default)(url, {
method: 'GET',
headers,
});
if (!res.ok) {
console.error(`Failed to fetch the URL: ${res.status} ${res.statusText} - ${url}`);
return undefined;
}
return res.text();
}
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// For reading/writing the HLS manifest\nimport fetch from 'node-fetch'; // For making a request to the origin\nimport { getDesiredSessionVolume, getAbsoluteUrl } from './util';\n\nconst HLS_ENDPOINT_URL = process.env.HLS_ENDPOINT_URL as string;\nconst REQUEST_HEADERS = JSON.parse(process.env.REQUEST_HEADERS as string);\nconst INDEX_OF_RENDITIONS = Number.parseInt(process.env.INDEX_OF_RENDITIONS as string, 10);\nconst SESSION_REQUIREMENTS = JSON.parse(process.env.SESSION_REQUIREMENTS as string);\nconst EVENT_START_TIME = new Date(process.env.EVENT_START_TIME as string);\nconst SEGMENT_REQUEST = process.env.SEGMENT_REQUEST === 'true';\n\nHLS.setOptions({ silent: true }); // Surpress the error message\n\nexport async function handler(event: any) {\n  const urlList = event.urlList;\n  const desiredSessionVolume = getDesiredSessionVolume(EVENT_START_TIME, SESSION_REQUIREMENTS.graph);\n  console.log(`Desired session volume: ${desiredSessionVolume}`);\n  if (urlList.length < desiredSessionVolume) {\n    const createNum = desiredSessionVolume - urlList.length;\n    for (let i = 0; i < createNum; i++) {\n      const url = await getRenditionUrl(HLS_ENDPOINT_URL, INDEX_OF_RENDITIONS);\n      urlList.push(url);\n    }\n  } else {\n    urlList.length = desiredSessionVolume;\n  }\n  for (const url of urlList) {\n    if (SEGMENT_REQUEST) {\n      await getLastSegment(url);\n    } else {\n      await getPlaylist(url, false);\n    }\n  }\n  return { urlList, timestamp: new Date().toISOString() };\n}\n\nasync function getRenditionUrl(masterPlaylistUrl: string, index: number): Promise<string | undefined> {\n  const playlist = await getPlaylist(masterPlaylistUrl) as HLS.types.Playlist | undefined;\n  if (!playlist || !playlist.isMasterPlaylist) {\n    console.error('Failed to fetch the master playlist');\n    return undefined;\n  }\n  const masterPlaylist = playlist as HLS.types.MasterPlaylist;\n  if (masterPlaylist.variants.length === 0) {\n    console.error('No variant found in the master playlist');\n    return undefined;\n  }\n  return getAbsoluteUrl(masterPlaylistUrl, masterPlaylist.variants[index].uri);\n}\n\nasync function getLastSegment(playlistUrl: string): Promise<string | undefined> {\n  const playlist = await getPlaylist(playlistUrl) as HLS.types.Playlist | undefined;\n  if (!playlist || playlist.isMasterPlaylist) {\n    console.error('Failed to fetch the media playlist');\n    return undefined;\n  }\n  const mediaPlaylist = playlist as HLS.types.MediaPlaylist;\n  if (mediaPlaylist.segments.length === 0) {\n    console.error('No segments found in the media playlist');\n    return undefined;\n  }\n  const lastSegmentUrl = getAbsoluteUrl(playlistUrl, mediaPlaylist.segments[mediaPlaylist.segments.length - 1].uri);\n  return void fetchUrl(lastSegmentUrl); // Don't wait for the response\n}\n\nasync function getPlaylist(url: string, parse = true): Promise<HLS.types.Playlist | string | undefined> {\n  const txt = await fetchUrl(url, true);\n  if (txt && parse) {\n    return HLS.parse(txt);\n  }\n  return txt;\n}\n\nasync function fetchUrl(url: string, returnText = false): Promise<string | undefined> {\n  const headers = process.env.DISABLE_REQUEST_HEADERS === 'true' ? {} : REQUEST_HEADERS;\n  if (!returnText) {\n    return void fetch(url, {\n      method: 'GET',\n      headers,\n    });\n  }\n  const res = await fetch(url, {\n    method: 'GET',\n    headers,\n  });\n  if (!res.ok) {\n    console.error(`Failed to fetch the URL: ${res.status} ${res.statusText} - ${url}`);\n    return undefined;\n  }\n  return res.text();\n}"]}