129 lines
3.4 KiB
JavaScript
129 lines
3.4 KiB
JavaScript
import Ember from 'ember';
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import { alias } from '@ember/object/computed';
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import { assert } from '@ember/debug';
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import Evented from '@ember/object/evented';
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import EmberObject, { computed } from '@ember/object';
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import { assign } from '@ember/polyfills';
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import queryString from 'npm:query-string';
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import { task } from 'ember-concurrency';
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import StreamLogger from 'nomad-ui/utils/classes/stream-logger';
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import PollLogger from 'nomad-ui/utils/classes/poll-logger';
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const MAX_OUTPUT_LENGTH = 50000;
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export const fetchFailure = url => () => Ember.Logger.warn(`LOG FETCH: Couldn't connect to ${url}`);
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const Log = EmberObject.extend(Evented, {
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// Parameters
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url: '',
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params: computed(() => ({})),
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logFetch() {
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assert('Log objects need a logFetch method, which should have an interface like window.fetch');
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},
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// Read-only state
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isStreaming: alias('logStreamer.poll.isRunning'),
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logPointer: null,
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logStreamer: null,
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// The top of the log
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head: '',
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// The bottom of the log
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tail: '',
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// The top or bottom of the log, depending on whether
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// the logPointer is pointed at head or tail
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output: computed('logPointer', 'head', 'tail', function() {
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return this.get('logPointer') === 'head' ? this.get('head') : this.get('tail');
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}),
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init() {
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this._super();
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const args = this.getProperties('url', 'params', 'logFetch');
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args.write = chunk => {
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let newTail = this.get('tail') + chunk;
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if (newTail.length > MAX_OUTPUT_LENGTH) {
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newTail = newTail.substr(newTail.length - MAX_OUTPUT_LENGTH);
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}
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this.set('tail', newTail);
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this.trigger('tick', chunk);
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};
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if (StreamLogger.isSupported) {
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this.set('logStreamer', StreamLogger.create(args));
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} else {
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this.set('logStreamer', PollLogger.create(args));
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}
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},
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destroy() {
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this.stop();
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this._super();
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},
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gotoHead: task(function*() {
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const logFetch = this.get('logFetch');
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const queryParams = queryString.stringify(
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assign(this.get('params'), {
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plain: true,
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origin: 'start',
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offset: 0,
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})
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);
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const url = `${this.get('url')}?${queryParams}`;
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this.stop();
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let text = yield logFetch(url).then(res => res.text(), fetchFailure(url));
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if (text && text.length > MAX_OUTPUT_LENGTH) {
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text = text.substr(0, MAX_OUTPUT_LENGTH);
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text += '\n\n---------- TRUNCATED: Click "tail" to view the bottom of the log ----------';
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}
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this.set('head', text);
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this.set('logPointer', 'head');
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}),
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gotoTail: task(function*() {
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const logFetch = this.get('logFetch');
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const queryParams = queryString.stringify(
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assign(this.get('params'), {
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plain: true,
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origin: 'end',
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offset: MAX_OUTPUT_LENGTH,
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})
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);
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const url = `${this.get('url')}?${queryParams}`;
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this.stop();
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let text = yield logFetch(url).then(res => res.text(), fetchFailure(url));
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this.set('tail', text);
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this.set('logPointer', 'tail');
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}),
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startStreaming() {
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this.set('logPointer', 'tail');
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return this.get('logStreamer').start();
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},
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stop() {
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this.get('logStreamer').stop();
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},
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});
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export default Log;
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export function logger(urlProp, params, logFetch) {
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return computed(urlProp, params, function() {
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return Log.create({
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logFetch: logFetch.call(this),
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params: this.get(params),
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url: this.get(urlProp),
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});
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});
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}
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