-
-
Notifications
You must be signed in to change notification settings - Fork 658
/
global-frontend-api-cache.ts
169 lines (141 loc) · 5.67 KB
/
global-frontend-api-cache.ts
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
import EventEmitter from 'events';
import { Segment } from 'unleash-client/lib/strategy/strategy';
import { FeatureInterface } from 'unleash-client/lib/feature';
import { IApiUser } from '../../types/api-user';
import {
IFeatureToggleClient,
ISegmentReadModel,
IUnleashConfig,
} from '../../types';
import {
mapFeatureForClient,
mapSegmentsForClient,
} from '../playground/offline-unleash-client';
import { ALL_ENVS } from '../../util/constants';
import { Logger } from '../../logger';
import { UPDATE_REVISION } from '../feature-toggle/configuration-revision-service';
import { IClientFeatureToggleReadModel } from './client-feature-toggle-read-model-type';
import metricsHelper from '../../util/metrics-helper';
import { FUNCTION_TIME } from '../../metric-events';
type Config = Pick<IUnleashConfig, 'getLogger' | 'flagResolver' | 'eventBus'>;
type FrontendApiFeatureCache = Record<string, Record<string, FeatureInterface>>;
export type GlobalFrontendApiCacheState = 'starting' | 'ready' | 'updated';
export class GlobalFrontendApiCache extends EventEmitter {
private readonly config: Config;
private readonly logger: Logger;
private readonly clientFeatureToggleReadModel: IClientFeatureToggleReadModel;
private readonly segmentReadModel: ISegmentReadModel;
private readonly configurationRevisionService: EventEmitter;
private featuresByEnvironment: FrontendApiFeatureCache = {};
private segments: Segment[] = [];
private status: GlobalFrontendApiCacheState = 'starting';
private timer: Function;
constructor(
config: Config,
segmentReadModel: ISegmentReadModel,
clientFeatureToggleReadModel: IClientFeatureToggleReadModel,
configurationRevisionService: EventEmitter,
) {
super();
this.config = config;
this.logger = config.getLogger('global-frontend-api-cache.ts');
this.clientFeatureToggleReadModel = clientFeatureToggleReadModel;
this.configurationRevisionService = configurationRevisionService;
this.segmentReadModel = segmentReadModel;
this.onUpdateRevisionEvent = this.onUpdateRevisionEvent.bind(this);
this.timer = (functionName) =>
metricsHelper.wrapTimer(config.eventBus, FUNCTION_TIME, {
className: 'GlobalFrontendApiCache',
functionName,
});
this.refreshData();
this.configurationRevisionService.on(
UPDATE_REVISION,
this.onUpdateRevisionEvent,
);
}
getSegment(id: number): Segment | undefined {
return this.segments.find((segment) => segment.id === id);
}
getToggle(name: string, token: IApiUser): FeatureInterface {
const features = this.getTogglesByEnvironment(
this.environmentNameForToken(token),
);
return features[name];
}
getToggles(token: IApiUser): FeatureInterface[] {
const features = this.getTogglesByEnvironment(
this.environmentNameForToken(token),
);
return this.filterTogglesByProjects(features, token.projects);
}
private filterTogglesByProjects(
features: Record<string, FeatureInterface>,
projects: string[],
): FeatureInterface[] {
if (projects.includes('*')) {
return Object.values(features);
}
return Object.values(features).filter(
(feature) => feature.project && projects.includes(feature.project),
);
}
private getTogglesByEnvironment(
environment: string,
): Record<string, FeatureInterface> {
const features = this.featuresByEnvironment[environment];
if (features == null) return {};
return features;
}
// TODO: fetch only relevant projects/environments based on tokens
// TODO: also consider not fetching disabled features, because those are not returned by frontend API
private async refreshData() {
try {
const stopTimer = this.timer('refreshData');
this.featuresByEnvironment = await this.getAllFeatures();
this.segments = await this.getAllSegments();
if (this.status === 'starting') {
this.status = 'ready';
this.emit('ready');
} else if (this.status === 'ready' || this.status === 'updated') {
this.status = 'updated';
this.emit('updated');
}
stopTimer();
} catch (e) {
this.logger.error('Cannot load data for token', e);
}
}
private async getAllFeatures(): Promise<FrontendApiFeatureCache> {
const features = await this.clientFeatureToggleReadModel.getAll();
return this.mapFeatures(features);
}
private async getAllSegments(): Promise<Segment[]> {
return mapSegmentsForClient(await this.segmentReadModel.getAll());
}
private async onUpdateRevisionEvent() {
if (this.config.flagResolver.isEnabled('globalFrontendApiCache')) {
await this.refreshData();
}
}
private environmentNameForToken(token: IApiUser): string {
if (token.environment === ALL_ENVS) {
return 'default';
}
return token.environment;
}
private mapFeatures(
features: Record<string, Record<string, IFeatureToggleClient>>,
): FrontendApiFeatureCache {
const entries = Object.entries(features).map(([key, value]) => [
key,
Object.fromEntries(
Object.entries(value).map(([innerKey, innerValue]) => [
innerKey,
mapFeatureForClient(innerValue),
]),
),
]);
return Object.fromEntries(entries);
}
}