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1 files changed, 97 insertions, 0 deletions

diff --git a/frontend-old/node_modules/@grpc/grpc-js/src/subchannel-interface.ts b/frontend-old/node_modules/@grpc/grpc-js/src/subchannel-interface.ts
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+++ b/frontend-old/node_modules/@grpc/grpc-js/src/subchannel-interface.ts
@@ -0,0 +1,97 @@
+/*
+ * Copyright 2022 gRPC authors.
+ *
+ * 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 { SubchannelRef } from './channelz';
+import { ConnectivityState } from './connectivity-state';
+import { Subchannel } from './subchannel';
+
+export type ConnectivityStateListener = (
+  subchannel: SubchannelInterface,
+  previousState: ConnectivityState,
+  newState: ConnectivityState,
+  keepaliveTime: number,
+  errorMessage?: string
+) => void;
+
+/**
+ * This is an interface for load balancing policies to use to interact with
+ * subchannels. This allows load balancing policies to wrap and unwrap
+ * subchannels.
+ *
+ * Any load balancing policy that wraps subchannels must unwrap the subchannel
+ * in the picker, so that other load balancing policies consistently have
+ * access to their own wrapper objects.
+ */
+export interface SubchannelInterface {
+  getConnectivityState(): ConnectivityState;
+  addConnectivityStateListener(listener: ConnectivityStateListener): void;
+  removeConnectivityStateListener(listener: ConnectivityStateListener): void;
+  startConnecting(): void;
+  getAddress(): string;
+  throttleKeepalive(newKeepaliveTime: number): void;
+  ref(): void;
+  unref(): void;
+  getChannelzRef(): SubchannelRef;
+  /**
+   * If this is a wrapper, return the wrapped subchannel, otherwise return this
+   */
+  getRealSubchannel(): Subchannel;
+  /**
+   * Returns true if this and other both proxy the same underlying subchannel.
+   * Can be used instead of directly accessing getRealSubchannel to allow mocks
+   * to avoid implementing getRealSubchannel
+   */
+  realSubchannelEquals(other: SubchannelInterface): boolean;
+}
+
+export abstract class BaseSubchannelWrapper implements SubchannelInterface {
+  constructor(protected child: SubchannelInterface) {}
+
+  getConnectivityState(): ConnectivityState {
+    return this.child.getConnectivityState();
+  }
+  addConnectivityStateListener(listener: ConnectivityStateListener): void {
+    this.child.addConnectivityStateListener(listener);
+  }
+  removeConnectivityStateListener(listener: ConnectivityStateListener): void {
+    this.child.removeConnectivityStateListener(listener);
+  }
+  startConnecting(): void {
+    this.child.startConnecting();
+  }
+  getAddress(): string {
+    return this.child.getAddress();
+  }
+  throttleKeepalive(newKeepaliveTime: number): void {
+    this.child.throttleKeepalive(newKeepaliveTime);
+  }
+  ref(): void {
+    this.child.ref();
+  }
+  unref(): void {
+    this.child.unref();
+  }
+  getChannelzRef(): SubchannelRef {
+    return this.child.getChannelzRef();
+  }
+  getRealSubchannel(): Subchannel {
+    return this.child.getRealSubchannel();
+  }
+  realSubchannelEquals(other: SubchannelInterface): boolean {
+    return this.getRealSubchannel() === other.getRealSubchannel();
+  }
+}