112 lines
3.8 KiB
JavaScript
112 lines
3.8 KiB
JavaScript
export default function(config = {}, win = window, doc = document) {
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const dev = function() {
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return doc.cookie
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.split(';')
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.filter(item => item !== '')
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.map(item => item.trim().split('='));
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};
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const user = function(str) {
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const item = win.localStorage.getItem(str);
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return item === null ? undefined : item;
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};
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const getResourceFor = function(src) {
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try {
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return (
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win.performance.getEntriesByType('resource').find(item => {
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return item.initiatorType === 'script' && src === item.name;
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}) || {}
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);
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} catch (e) {
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return {};
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}
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};
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const scripts = doc.getElementsByTagName('script');
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const currentSrc = scripts[scripts.length - 1].src;
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let resource;
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// TODO: Look to see if we can pull in HTTP headers here
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// so we can let things be controlled via HTTP proxies, for example
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// turning off blocking queries if its a busy cluster etc
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const operator = function(str, env) {
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let protocol;
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switch (str) {
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case 'CONSUL_HTTP_PROTOCOL':
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if (typeof resource === 'undefined') {
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// resource needs to be retrieved lazily as entries aren't guaranteed
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// to be available at script execution time (caching seems to affect this)
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// waiting until we retrieve this value lazily at runtime means that
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// the entries are always available as these values are only retrieved
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// after initialization
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// current is based on the assumption that whereever this script is it's
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// likely to be the same as the xmlhttprequests
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resource = getResourceFor(currentSrc);
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}
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return resource.nextHopProtocol || 'http/1.1';
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case 'CONSUL_HTTP_MAX_CONNECTIONS':
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protocol = env('CONSUL_HTTP_PROTOCOL');
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// http/2, http2+QUIC/39 and SPDY don't have connection limits
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switch (true) {
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case protocol.indexOf('h2') === 0:
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case protocol.indexOf('hq') === 0:
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case protocol.indexOf('spdy') === 0:
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// TODO: Change this to return -1 so we try to consistently
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// return a value from env vars
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return;
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default:
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// generally 6 are available
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// reserve 1 for traffic that we can't manage
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return 5;
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}
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}
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};
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const ui = function(key) {
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let $;
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switch (config.environment) {
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case 'development':
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case 'staging':
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case 'coverage':
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case 'test':
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$ = dev().reduce(function(prev, [key, value]) {
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switch (key) {
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case 'CONSUL_ACLS_ENABLE':
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prev['CONSUL_ACLS_ENABLED'] = !!JSON.parse(String(value).toLowerCase());
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break;
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case 'CONSUL_NSPACES_ENABLE':
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prev['CONSUL_NSPACES_ENABLED'] = !!JSON.parse(String(value).toLowerCase());
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break;
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default:
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prev[key] = value;
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}
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return prev;
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}, {});
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if (typeof $[key] !== 'undefined') {
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return $[key];
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}
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break;
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}
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return config[key];
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};
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return function env(str) {
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switch (str) {
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// All user providable values should start with CONSUL_UI
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// We allow the user to set these ones via localStorage
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// user value is preferred.
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case 'CONSUL_UI_DISABLE_REALTIME':
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case 'CONSUL_UI_DISABLE_ANCHOR_SELECTION':
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// these are booleans cast things out
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return !!JSON.parse(String(user(str) || 0).toLowerCase()) || ui(str);
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case 'CONSUL_UI_REALTIME_RUNNER':
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// these are strings
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return user(str) || ui(str);
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case 'CONSUL_HTTP_PROTOCOL':
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case 'CONSUL_HTTP_MAX_CONNECTIONS':
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// We allow the operator to set these ones via various methods
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// although UI developer config is preferred
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return ui(str) || operator(str, env);
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default:
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return ui(str);
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}
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};
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}
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