@tangential/firebase-util
Version:
Utility classes and shared functionality for Tangential services that use Firebase.
134 lines • 15.5 kB
JavaScript
import { set, push, remove, update, onValue } from 'firebase/database';
import { BehaviorSubject } from 'rxjs';
import { filter, first } from 'rxjs/operators';
import { Placeholder } from './placeholder';
export const OnRefKeys = {
value: 'value',
child_added: 'child_added',
child_removed: 'child_removed',
child_changed: 'child_changed',
child_moved: 'child_moved',
};
/**
* Copy-paste for local use, rather than create a dependency on core.
*/
const isObject = function (value) {
return (typeof value === 'object' || value['constructor'] === Object);
};
/**
* Prevent typescript casting issues while maintaining/enhancing type safety.
*/
export class FireBlanket {
/**
* Read the value once and return.
* @param query
*/
static value(query) {
return new Promise((resolve, reject) => {
onValue(query, (snap) => {
resolve(snap);
}, {
onlyOnce: true
});
});
}
static value$(query) {
const subject = new BehaviorSubject(Placeholder); // this semicolon is required.
/** @todo: ggranum: The unsubscribe is hacky, and won't actually remove the firebase
* listener unless there is a 'next' element called
* @maybeBug: Possible memory leak for long-running sessions with many value listeners
* */
subject['_firebaseUnsubscribe'] = onValue(query, (snap) => {
if (subject.closed) {
subject['_firebaseUnsubscribe']();
delete subject['_firebaseUnsubscribe'];
}
subject.next(snap);
}, (error) => {
subject.error(error);
});
return subject;
}
static awaitValue$(query) {
return this.value$(query).pipe(filter(v => v !== Placeholder));
}
static valueOnce$(query) {
return this.value$(query).pipe(first(v => v !== Placeholder));
}
static set(ref, value) {
return new Promise((resolve, reject) => {
try {
set(ref, value).then(() => { }).catch((e) => {
if (e) {
reject(e);
}
else {
resolve();
}
});
}
catch (e) {
reject(e);
}
});
}
static push(ref, value) {
return new Promise((resolve, reject) => {
try {
push(ref, value).catch((e) => {
if (e) {
reject(e);
}
else {
resolve();
}
});
}
catch (e) {
reject(e);
}
});
}
static update(ref, value) {
return update(ref, value);
}
static remove(ref) {
return remove(ref);
}
}
FireBlanket.util = {
clean(obj, deep = true) {
const cleanObj = {};
Object.keys(obj).forEach((key) => {
let value = obj[key];
if (FireBlanket.util.isLegalFirebaseKey(key) && FireBlanket.util.isLegalFirebaseValue(value)) {
cleanObj[key] = (deep && isObject(value)) ? FireBlanket.util.clean(value) : value;
}
});
return cleanObj;
},
removeIllegalKeys(obj) {
const cleanObj = {};
Object.keys(obj).forEach((key) => {
if (FireBlanket.util.isLegalFirebaseKey(key)) {
cleanObj[key] = obj[key];
}
});
return cleanObj;
},
isLegalFirebaseKey(key) {
return key !== null && key !== undefined && !key.startsWith('$');
},
isLegalFirebaseValue(value) {
return value !== null && value !== undefined;
},
isFirebaseGeneratedId(key) {
let isKey = false;
// starts with "-" will be true for over a decade.
if (key && key.length === 20 && key.startsWith('-')) {
isKey = true;
}
return isKey;
}
};
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{DatabaseReference, Query, DataSnapshot} from '@firebase/database'\nimport { set, push, remove, update, onValue } from 'firebase/database'\nimport {BehaviorSubject, Observable} from 'rxjs'\nimport {filter, first} from 'rxjs/operators'\n\nimport {Placeholder} from './placeholder'\n\nexport type OnRefKey = 'value' | 'child_added' | 'child_removed' | 'child_changed' | 'child_moved'\nexport const OnRefKeys = {\n  value:         <OnRefKey>'value',\n  child_added:   <OnRefKey>'child_added',\n  child_removed: <OnRefKey>'child_removed',\n  child_changed: <OnRefKey>'child_changed',\n  child_moved:   <OnRefKey>'child_moved',\n}\n\n/**\n * Copy-paste for local use, rather than create a dependency on core.\n */\nconst isObject = function (value: any): boolean {\n  return (typeof value === 'object' || value['constructor'] === Object)\n}\n\n/**\n * Prevent typescript casting issues while maintaining/enhancing type safety.\n */\nexport class FireBlanket {\n\n  static util = {\n\n    clean<T extends object>(obj: T, deep: boolean = true): T {\n      const cleanObj: T = <T>{}\n      Object.keys(obj).forEach((key) => {\n        let value = (obj as any)[key]\n        if (FireBlanket.util.isLegalFirebaseKey(key) && FireBlanket.util.isLegalFirebaseValue(value)) {\n          (cleanObj as any)[key] = (deep && isObject(value)) ? FireBlanket.util.clean(value) : value\n        }\n      })\n      return cleanObj\n    },\n\n    removeIllegalKeys<T extends object>(obj: T): T {\n      const cleanObj: T = <T>{}\n      Object.keys(obj as any).forEach((key) => {\n        if (FireBlanket.util.isLegalFirebaseKey(key)) {\n          (cleanObj as any)[key] = (obj as any)[key]\n        }\n      })\n      return cleanObj\n    },\n\n    isLegalFirebaseKey(key: string): boolean {\n      return key !== null && key !== undefined && !key.startsWith('$')\n    },\n\n    isLegalFirebaseValue(value: any): boolean {\n      return value !== null && value !== undefined\n    },\n\n    isFirebaseGeneratedId(key: string): boolean {\n      let isKey = false\n      // starts with \"-\" will be true for over a decade.\n      if (key && key.length === 20 && key.startsWith('-')) {\n        isKey = true\n      }\n      return isKey\n    }\n\n  }\n\n  /**\n   * Read the value once and return.\n   * @param query\n   */\n  static value(query: Query): Promise<DataSnapshot> {\n    return new Promise<DataSnapshot>((resolve, reject) => {\n      onValue(query, (snap: DataSnapshot) => {\n        resolve(snap);\n      }, {\n        onlyOnce: true\n      });\n    });\n  }\n\n  static value$(query: Query): Observable<DataSnapshot> {\n    const subject = new BehaviorSubject(Placeholder); // this semicolon is required.\n\n    /** @todo: ggranum: The unsubscribe is hacky, and won't actually remove the firebase\n     * listener unless there is a 'next' element called\n     * @maybeBug: Possible memory leak for long-running sessions with many value listeners\n     * */\n      (subject as any)['_firebaseUnsubscribe'] = onValue(query, (snap: DataSnapshot) => {\n      if(subject.closed){\n        (subject as any)['_firebaseUnsubscribe']()\n        delete (subject as any)['_firebaseUnsubscribe']\n      }\n      subject.next(snap)\n    }, (error: any) => {\n      subject.error(error)\n    })\n    return subject\n  }\n\n  static awaitValue$(query: Query): Observable<DataSnapshot> {\n    return this.value$(query).pipe(filter(v => v !== Placeholder))\n  }\n\n  static valueOnce$(query: Query): Observable<DataSnapshot> {\n    return this.value$(query).pipe(first(v => v !== Placeholder))\n  }\n\n  static set<T>(ref: DatabaseReference, value: T): Promise<void> {\n    return new Promise<void>((resolve, reject) => {\n      try {\n        set(ref, value).then(() => {}).catch((e: Error) => {\n          if (e) {\n            reject(e)\n          } else {\n            resolve()\n          }\n        })\n      } catch (e) {\n        reject(e)\n      }\n    })\n  }\n\n  static push<T>(ref: DatabaseReference, value: T): Promise<void> {\n    return new Promise<void>((resolve, reject) => {\n      try {\n        push(ref, value).catch((e: Error) => {\n          if (e) {\n            reject(e)\n          } else {\n            resolve()\n          }\n        })\n      } catch (e) {\n        reject(e)\n      }\n    })\n  }\n\n  static update<T extends object>(ref: DatabaseReference, value: T): Promise<void> {\n       return update(ref, value )\n  }\n\n  static remove<T>(ref: DatabaseReference): Promise<void> {\n    return remove(ref)\n  }\n}\n"]}