# All files / remote stream_bridge.ts

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     /**
     * Copyright 2017 Google Inc.
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     *   http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */

    import { assert } from '../util/assert';
    import { FirestoreError } from '../util/error';

    import { Stream } from './connection';

    /**
     * Provides a simple helper class that implements the Stream interface to
     * bridge to other implementations that are streams but do not implement the
     * interface. The stream callbacks are invoked with the callOn... methods.
     */
    export class StreamBridge<I, O> implements Stream<I, O> {
      private wrappedOnOpen: () => void | undefined;
      private wrappedOnClose: (err?: FirestoreError) => void | undefined;
      private wrappedOnMessage: (msg: O) => void | undefined;

      private sendFn: (msg: I) => void;
      private closeFn: () => void;

      constructor(args: { sendFn: (msg: I) => void; closeFn: () => void }) {
        this.sendFn = args.sendFn;
        this.closeFn = args.closeFn;
      }

      onOpen(callback: () => void): void {
        assert(!this.wrappedOnOpen, 'Called onOpen on stream twice!');
        this.wrappedOnOpen = callback;
      }

      onClose(callback: (err?: FirestoreError) => void): void {
        assert(!this.wrappedOnClose, 'Called onClose on stream twice!');
        this.wrappedOnClose = callback;
      }

      onMessage(callback: (msg: O) => void): void {
        assert(!this.wrappedOnMessage, 'Called onMessage on stream twice!');
        this.wrappedOnMessage = callback;
      }

      close(): void {
        this.closeFn();
      }

      send(msg: I): void {
        this.sendFn(msg);
      }

      callOnOpen(): void {
        assert(
          this.wrappedOnOpen !== undefined,
          'Cannot call onOpen because no callback was set'
        );
        this.wrappedOnOpen!();
      }

      callOnClose(err?: FirestoreError): void {
        assert(
          this.wrappedOnClose !== undefined,
          'Cannot call onClose because no callback was set'
        );
        this.wrappedOnClose!(err);
      }

      callOnMessage(msg: O): void {
        assert(
          this.wrappedOnMessage !== undefined,
          'Cannot call onMessage because no callback was set'
        );
        this.wrappedOnMessage!(msg);
      }
    }