1 files changed, 1022 insertions, 0 deletions
diff --git a/frontend-old/node_modules/@grpc/grpc-js/src/server-call.ts b/frontend-old/node_modules/@grpc/grpc-js/src/server-call.ts
new file mode 100644
index 0000000..3032c6e
--- /dev/null
+++ b/frontend-old/node_modules/@grpc/grpc-js/src/server-call.ts
@@ -0,0 +1,1022 @@
+/*
+ * Copyright 2019 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 { EventEmitter } from 'events';
+import * as http2 from 'http2';
+import { Duplex, Readable, Writable } from 'stream';
+import * as zlib from 'zlib';
+
+import {
+  Status,
+  DEFAULT_MAX_SEND_MESSAGE_LENGTH,
+  DEFAULT_MAX_RECEIVE_MESSAGE_LENGTH,
+  LogVerbosity,
+} from './constants';
+import { Deserialize, Serialize } from './make-client';
+import { Metadata } from './metadata';
+import { StreamDecoder } from './stream-decoder';
+import { ObjectReadable, ObjectWritable } from './object-stream';
+import { ChannelOptions } from './channel-options';
+import * as logging from './logging';
+import { StatusObject, PartialStatusObject } from './call-interface';
+import { Deadline } from './deadline';
+import { getErrorCode, getErrorMessage } from './error';
+
+const TRACER_NAME = 'server_call';
+
+function trace(text: string): void {
+  logging.trace(LogVerbosity.DEBUG, TRACER_NAME, text);
+}
+
+interface DeadlineUnitIndexSignature {
+  [name: string]: number;
+}
+
+const GRPC_ACCEPT_ENCODING_HEADER = 'grpc-accept-encoding';
+const GRPC_ENCODING_HEADER = 'grpc-encoding';
+const GRPC_MESSAGE_HEADER = 'grpc-message';
+const GRPC_STATUS_HEADER = 'grpc-status';
+const GRPC_TIMEOUT_HEADER = 'grpc-timeout';
+const DEADLINE_REGEX = /(\d{1,8})\s*([HMSmun])/;
+const deadlineUnitsToMs: DeadlineUnitIndexSignature = {
+  H: 3600000,
+  M: 60000,
+  S: 1000,
+  m: 1,
+  u: 0.001,
+  n: 0.000001,
+};
+const defaultCompressionHeaders = {
+  // TODO(cjihrig): Remove these encoding headers from the default response
+  // once compression is integrated.
+  [GRPC_ACCEPT_ENCODING_HEADER]: 'identity,deflate,gzip',
+  [GRPC_ENCODING_HEADER]: 'identity',
+};
+const defaultResponseHeaders = {
+  [http2.constants.HTTP2_HEADER_STATUS]: http2.constants.HTTP_STATUS_OK,
+  [http2.constants.HTTP2_HEADER_CONTENT_TYPE]: 'application/grpc+proto',
+};
+const defaultResponseOptions = {
+  waitForTrailers: true,
+} as http2.ServerStreamResponseOptions;
+
+export type ServerStatusResponse = Partial<StatusObject>;
+
+export type ServerErrorResponse = ServerStatusResponse & Error;
+
+export type ServerSurfaceCall = {
+  cancelled: boolean;
+  readonly metadata: Metadata;
+  getPeer(): string;
+  sendMetadata(responseMetadata: Metadata): void;
+  getDeadline(): Deadline;
+  getPath(): string;
+} & EventEmitter;
+
+export type ServerUnaryCall<RequestType, ResponseType> = ServerSurfaceCall & {
+  request: RequestType;
+};
+export type ServerReadableStream<RequestType, ResponseType> =
+  ServerSurfaceCall & ObjectReadable<RequestType>;
+export type ServerWritableStream<RequestType, ResponseType> =
+  ServerSurfaceCall &
+    ObjectWritable<ResponseType> & {
+      request: RequestType;
+      end: (metadata?: Metadata) => void;
+    };
+export type ServerDuplexStream<RequestType, ResponseType> = ServerSurfaceCall &
+  ObjectReadable<RequestType> &
+  ObjectWritable<ResponseType> & { end: (metadata?: Metadata) => void };
+
+export class ServerUnaryCallImpl<RequestType, ResponseType>
+  extends EventEmitter
+  implements ServerUnaryCall<RequestType, ResponseType>
+{
+  cancelled: boolean;
+
+  constructor(
+    private call: Http2ServerCallStream<RequestType, ResponseType>,
+    public metadata: Metadata,
+    public request: RequestType
+  ) {
+    super();
+    this.cancelled = false;
+    this.call.setupSurfaceCall(this);
+  }
+
+  getPeer(): string {
+    return this.call.getPeer();
+  }
+
+  sendMetadata(responseMetadata: Metadata): void {
+    this.call.sendMetadata(responseMetadata);
+  }
+
+  getDeadline(): Deadline {
+    return this.call.getDeadline();
+  }
+
+  getPath(): string {
+    return this.call.getPath();
+  }
+}
+
+export class ServerReadableStreamImpl<RequestType, ResponseType>
+  extends Readable
+  implements ServerReadableStream<RequestType, ResponseType>
+{
+  cancelled: boolean;
+
+  constructor(
+    private call: Http2ServerCallStream<RequestType, ResponseType>,
+    public metadata: Metadata,
+    public deserialize: Deserialize<RequestType>,
+    encoding: string
+  ) {
+    super({ objectMode: true });
+    this.cancelled = false;
+    this.call.setupSurfaceCall(this);
+    this.call.setupReadable(this, encoding);
+  }
+
+  _read(size: number) {
+    if (!this.call.consumeUnpushedMessages(this)) {
+      return;
+    }
+
+    this.call.resume();
+  }
+
+  getPeer(): string {
+    return this.call.getPeer();
+  }
+
+  sendMetadata(responseMetadata: Metadata): void {
+    this.call.sendMetadata(responseMetadata);
+  }
+
+  getDeadline(): Deadline {
+    return this.call.getDeadline();
+  }
+
+  getPath(): string {
+    return this.call.getPath();
+  }
+}
+
+export class ServerWritableStreamImpl<RequestType, ResponseType>
+  extends Writable
+  implements ServerWritableStream<RequestType, ResponseType>
+{
+  cancelled: boolean;
+  private trailingMetadata: Metadata;
+
+  constructor(
+    private call: Http2ServerCallStream<RequestType, ResponseType>,
+    public metadata: Metadata,
+    public serialize: Serialize<ResponseType>,
+    public request: RequestType
+  ) {
+    super({ objectMode: true });
+    this.cancelled = false;
+    this.trailingMetadata = new Metadata();
+    this.call.setupSurfaceCall(this);
+
+    this.on('error', err => {
+      this.call.sendError(err);
+      this.end();
+    });
+  }
+
+  getPeer(): string {
+    return this.call.getPeer();
+  }
+
+  sendMetadata(responseMetadata: Metadata): void {
+    this.call.sendMetadata(responseMetadata);
+  }
+
+  getDeadline(): Deadline {
+    return this.call.getDeadline();
+  }
+
+  getPath(): string {
+    return this.call.getPath();
+  }
+
+  _write(
+    chunk: ResponseType,
+    encoding: string,
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    callback: (...args: any[]) => void
+  ) {
+    try {
+      const response = this.call.serializeMessage(chunk);
+
+      if (!this.call.write(response)) {
+        this.call.once('drain', callback);
+        return;
+      }
+    } catch (err) {
+      this.emit('error', {
+        details: getErrorMessage(err),
+        code: Status.INTERNAL,
+      });
+    }
+
+    callback();
+  }
+
+  _final(callback: Function): void {
+    this.call.sendStatus({
+      code: Status.OK,
+      details: 'OK',
+      metadata: this.trailingMetadata,
+    });
+    callback(null);
+  }
+
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  end(metadata?: any) {
+    if (metadata) {
+      this.trailingMetadata = metadata;
+    }
+
+    return super.end();
+  }
+}
+
+export class ServerDuplexStreamImpl<RequestType, ResponseType>
+  extends Duplex
+  implements ServerDuplexStream<RequestType, ResponseType>
+{
+  cancelled: boolean;
+  /* This field appears to be unsued, but it is actually used in _final, which is assiged from
+   * ServerWritableStreamImpl.prototype._final below. */
+  // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+  // @ts-ignore noUnusedLocals
+  private trailingMetadata: Metadata;
+
+  constructor(
+    private call: Http2ServerCallStream<RequestType, ResponseType>,
+    public metadata: Metadata,
+    public serialize: Serialize<ResponseType>,
+    public deserialize: Deserialize<RequestType>,
+    encoding: string
+  ) {
+    super({ objectMode: true });
+    this.cancelled = false;
+    this.trailingMetadata = new Metadata();
+    this.call.setupSurfaceCall(this);
+    this.call.setupReadable(this, encoding);
+
+    this.on('error', err => {
+      this.call.sendError(err);
+      this.end();
+    });
+  }
+
+  getPeer(): string {
+    return this.call.getPeer();
+  }
+
+  sendMetadata(responseMetadata: Metadata): void {
+    this.call.sendMetadata(responseMetadata);
+  }
+
+  getDeadline(): Deadline {
+    return this.call.getDeadline();
+  }
+
+  getPath(): string {
+    return this.call.getPath();
+  }
+
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  end(metadata?: any) {
+    if (metadata) {
+      this.trailingMetadata = metadata;
+    }
+
+    return super.end();
+  }
+}
+
+ServerDuplexStreamImpl.prototype._read =
+  ServerReadableStreamImpl.prototype._read;
+ServerDuplexStreamImpl.prototype._write =
+  ServerWritableStreamImpl.prototype._write;
+ServerDuplexStreamImpl.prototype._final =
+  ServerWritableStreamImpl.prototype._final;
+
+// Unary response callback signature.
+export type sendUnaryData<ResponseType> = (
+  error: ServerErrorResponse | ServerStatusResponse | null,
+  value?: ResponseType | null,
+  trailer?: Metadata,
+  flags?: number
+) => void;
+
+// User provided handler for unary calls.
+export type handleUnaryCall<RequestType, ResponseType> = (
+  call: ServerUnaryCall<RequestType, ResponseType>,
+  callback: sendUnaryData<ResponseType>
+) => void;
+
+// User provided handler for client streaming calls.
+export type handleClientStreamingCall<RequestType, ResponseType> = (
+  call: ServerReadableStream<RequestType, ResponseType>,
+  callback: sendUnaryData<ResponseType>
+) => void;
+
+// User provided handler for server streaming calls.
+export type handleServerStreamingCall<RequestType, ResponseType> = (
+  call: ServerWritableStream<RequestType, ResponseType>
+) => void;
+
+// User provided handler for bidirectional streaming calls.
+export type handleBidiStreamingCall<RequestType, ResponseType> = (
+  call: ServerDuplexStream<RequestType, ResponseType>
+) => void;
+
+export type HandleCall<RequestType, ResponseType> =
+  | handleUnaryCall<RequestType, ResponseType>
+  | handleClientStreamingCall<RequestType, ResponseType>
+  | handleServerStreamingCall<RequestType, ResponseType>
+  | handleBidiStreamingCall<RequestType, ResponseType>;
+
+export interface UnaryHandler<RequestType, ResponseType> {
+  func: handleUnaryCall<RequestType, ResponseType>;
+  serialize: Serialize<ResponseType>;
+  deserialize: Deserialize<RequestType>;
+  type: HandlerType;
+  path: string;
+}
+
+export interface ClientStreamingHandler<RequestType, ResponseType> {
+  func: handleClientStreamingCall<RequestType, ResponseType>;
+  serialize: Serialize<ResponseType>;
+  deserialize: Deserialize<RequestType>;
+  type: HandlerType;
+  path: string;
+}
+
+export interface ServerStreamingHandler<RequestType, ResponseType> {
+  func: handleServerStreamingCall<RequestType, ResponseType>;
+  serialize: Serialize<ResponseType>;
+  deserialize: Deserialize<RequestType>;
+  type: HandlerType;
+  path: string;
+}
+
+export interface BidiStreamingHandler<RequestType, ResponseType> {
+  func: handleBidiStreamingCall<RequestType, ResponseType>;
+  serialize: Serialize<ResponseType>;
+  deserialize: Deserialize<RequestType>;
+  type: HandlerType;
+  path: string;
+}
+
+export type Handler<RequestType, ResponseType> =
+  | UnaryHandler<RequestType, ResponseType>
+  | ClientStreamingHandler<RequestType, ResponseType>
+  | ServerStreamingHandler<RequestType, ResponseType>
+  | BidiStreamingHandler<RequestType, ResponseType>;
+
+export type HandlerType = 'bidi' | 'clientStream' | 'serverStream' | 'unary';
+
+// Internal class that wraps the HTTP2 request.
+export class Http2ServerCallStream<
+  RequestType,
+  ResponseType
+> extends EventEmitter {
+  cancelled = false;
+  deadlineTimer: NodeJS.Timeout | null = null;
+  private statusSent = false;
+  private deadline: Deadline = Infinity;
+  private wantTrailers = false;
+  private metadataSent = false;
+  private canPush = false;
+  private isPushPending = false;
+  private bufferedMessages: Array<Buffer | null> = [];
+  private messagesToPush: Array<RequestType | null> = [];
+  private maxSendMessageSize: number = DEFAULT_MAX_SEND_MESSAGE_LENGTH;
+  private maxReceiveMessageSize: number = DEFAULT_MAX_RECEIVE_MESSAGE_LENGTH;
+
+  constructor(
+    private stream: http2.ServerHttp2Stream,
+    private handler: Handler<RequestType, ResponseType>,
+    options: ChannelOptions
+  ) {
+    super();
+
+    this.stream.once('error', (err: ServerErrorResponse) => {
+      /* We need an error handler to avoid uncaught error event exceptions, but
+       * there is nothing we can reasonably do here. Any error event should
+       * have a corresponding close event, which handles emitting the cancelled
+       * event. And the stream is now in a bad state, so we can't reasonably
+       * expect to be able to send an error over it. */
+    });
+
+    this.stream.once('close', () => {
+      trace(
+        'Request to method ' +
+          this.handler?.path +
+          ' stream closed with rstCode ' +
+          this.stream.rstCode
+      );
+
+      if (!this.statusSent) {
+        this.cancelled = true;
+        this.emit('cancelled', 'cancelled');
+        this.emit('streamEnd', false);
+        this.sendStatus({
+          code: Status.CANCELLED,
+          details: 'Cancelled by client',
+          metadata: null,
+        });
+        if (this.deadlineTimer) clearTimeout(this.deadlineTimer);
+      }
+    });
+
+    this.stream.on('drain', () => {
+      this.emit('drain');
+    });
+
+    if ('grpc.max_send_message_length' in options) {
+      this.maxSendMessageSize = options['grpc.max_send_message_length']!;
+    }
+    if ('grpc.max_receive_message_length' in options) {
+      this.maxReceiveMessageSize = options['grpc.max_receive_message_length']!;
+    }
+  }
+
+  private checkCancelled(): boolean {
+    /* In some cases the stream can become destroyed before the close event
+     * fires. That creates a race condition that this check works around */
+    if (this.stream.destroyed || this.stream.closed) {
+      this.cancelled = true;
+    }
+    return this.cancelled;
+  }
+
+  private getDecompressedMessage(
+    message: Buffer,
+    encoding: string
+  ): Buffer | Promise<Buffer> {    const messageContents = message.subarray(5);
+    if (encoding === 'identity') {
+      return messageContents;
+    } else if (encoding === 'deflate' || encoding === 'gzip') {
+      let decompresser: zlib.Gunzip | zlib.Deflate;
+      if (encoding === 'deflate') {
+        decompresser = zlib.createInflate();
+      } else {
+        decompresser = zlib.createGunzip();
+      }
+      return new Promise((resolve, reject) => {
+        let totalLength = 0
+        const messageParts: Buffer[] = [];
+        decompresser.on('data', (chunk: Buffer) => {
+          messageParts.push(chunk);
+          totalLength += chunk.byteLength;
+          if (this.maxReceiveMessageSize !== -1 && totalLength > this.maxReceiveMessageSize) {
+            decompresser.destroy();
+            reject({
+              code: Status.RESOURCE_EXHAUSTED,
+              details: `Received message that decompresses to a size larger than ${this.maxReceiveMessageSize}`
+            });
+          }
+        });
+        decompresser.on('end', () => {
+          resolve(Buffer.concat(messageParts));
+        });
+        decompresser.write(messageContents);
+        decompresser.end();
+      });
+    } else {
+      return Promise.reject({
+        code: Status.UNIMPLEMENTED,
+        details: `Received message compressed with unsupported encoding "${encoding}"`,
+      });
+    }
+  }
+
+  sendMetadata(customMetadata?: Metadata) {
+    if (this.checkCancelled()) {
+      return;
+    }
+
+    if (this.metadataSent) {
+      return;
+    }
+
+    this.metadataSent = true;
+    const custom = customMetadata ? customMetadata.toHttp2Headers() : null;
+    // TODO(cjihrig): Include compression headers.
+    const headers = {
+      ...defaultResponseHeaders,
+      ...defaultCompressionHeaders,
+      ...custom,
+    };
+    this.stream.respond(headers, defaultResponseOptions);
+  }
+
+  receiveMetadata(headers: http2.IncomingHttpHeaders) {
+    const metadata = Metadata.fromHttp2Headers(headers);
+
+    if (logging.isTracerEnabled(TRACER_NAME)) {
+      trace(
+        'Request to ' +
+          this.handler.path +
+          ' received headers ' +
+          JSON.stringify(metadata.toJSON())
+      );
+    }
+
+    // TODO(cjihrig): Receive compression metadata.
+
+    const timeoutHeader = metadata.get(GRPC_TIMEOUT_HEADER);
+
+    if (timeoutHeader.length > 0) {
+      const match = timeoutHeader[0].toString().match(DEADLINE_REGEX);
+
+      if (match === null) {
+        const err = new Error('Invalid deadline') as ServerErrorResponse;
+        err.code = Status.OUT_OF_RANGE;
+        this.sendError(err);
+        return metadata;
+      }
+
+      const timeout = (+match[1] * deadlineUnitsToMs[match[2]]) | 0;
+
+      const now = new Date();
+      this.deadline = now.setMilliseconds(now.getMilliseconds() + timeout);
+      this.deadlineTimer = setTimeout(handleExpiredDeadline, timeout, this);
+      metadata.remove(GRPC_TIMEOUT_HEADER);
+    }
+
+    // Remove several headers that should not be propagated to the application
+    metadata.remove(http2.constants.HTTP2_HEADER_ACCEPT_ENCODING);
+    metadata.remove(http2.constants.HTTP2_HEADER_TE);
+    metadata.remove(http2.constants.HTTP2_HEADER_CONTENT_TYPE);
+    metadata.remove('grpc-accept-encoding');
+
+    return metadata;
+  }
+
+  receiveUnaryMessage(encoding: string): Promise<RequestType> {
+    return new Promise((resolve, reject) => {
+      const { stream } = this;
+
+      let receivedLength = 0;
+
+      // eslint-disable-next-line @typescript-eslint/no-this-alias
+      const call = this;
+      const body: Buffer[] = [];
+      const limit = this.maxReceiveMessageSize;
+
+      this.stream.on('data', onData);
+      this.stream.on('end', onEnd);
+      this.stream.on('error', onEnd);
+
+      function onData(chunk: Buffer) {
+        receivedLength += chunk.byteLength;
+
+        if (limit !== -1 && receivedLength > limit) {
+          stream.removeListener('data', onData);
+          stream.removeListener('end', onEnd);
+          stream.removeListener('error', onEnd);
+
+          reject({
+            code: Status.RESOURCE_EXHAUSTED,
+            details: `Received message larger than max (${receivedLength} vs. ${limit})`,
+          });
+          return;
+        }
+
+        body.push(chunk);
+      }
+
+      function onEnd(err?: Error) {
+        stream.removeListener('data', onData);
+        stream.removeListener('end', onEnd);
+        stream.removeListener('error', onEnd);
+
+        if (err !== undefined) {
+          reject({ code: Status.INTERNAL, details: err.message });
+          return;
+        }
+
+        if (receivedLength === 0) {
+          reject({
+            code: Status.INTERNAL,
+            details: 'received empty unary message',
+          });
+          return;
+        }
+
+        call.emit('receiveMessage');
+
+        const requestBytes = Buffer.concat(body, receivedLength);
+        const compressed = requestBytes.readUInt8(0) === 1;
+        const compressedMessageEncoding = compressed ? encoding : 'identity';
+        const decompressedMessage = call.getDecompressedMessage(
+          requestBytes,
+          compressedMessageEncoding
+        );
+
+        if (Buffer.isBuffer(decompressedMessage)) {
+          resolve(
+            call.deserializeMessageWithInternalError(decompressedMessage)
+          );
+          return;
+        }
+
+        decompressedMessage.then(
+          decompressed =>
+            resolve(call.deserializeMessageWithInternalError(decompressed)),
+          (err: any) =>
+            reject(
+              err.code
+                ? err
+                : {
+                    code: Status.INTERNAL,
+                    details: `Received "grpc-encoding" header "${encoding}" but ${encoding} decompression failed`,
+                  }
+            )
+        );
+      }
+    });
+  }
+
+  private async deserializeMessageWithInternalError(buffer: Buffer) {
+    try {
+      return this.deserializeMessage(buffer);
+    } catch (err) {
+      throw {
+        details: getErrorMessage(err),
+        code: Status.INTERNAL,
+      };
+    }
+  }
+
+  serializeMessage(value: ResponseType) {
+    const messageBuffer = this.handler.serialize(value);
+
+    // TODO(cjihrig): Call compression aware serializeMessage().
+    const byteLength = messageBuffer.byteLength;
+    const output = Buffer.allocUnsafe(byteLength + 5);
+    output.writeUInt8(0, 0);
+    output.writeUInt32BE(byteLength, 1);
+    messageBuffer.copy(output, 5);
+    return output;
+  }
+
+  deserializeMessage(bytes: Buffer) {
+    return this.handler.deserialize(bytes);
+  }
+
+  async sendUnaryMessage(
+    err: ServerErrorResponse | ServerStatusResponse | null,
+    value?: ResponseType | null,
+    metadata?: Metadata | null,
+    flags?: number
+  ) {
+    if (this.checkCancelled()) {
+      return;
+    }
+
+    if (metadata === undefined) {
+      metadata = null;
+    }
+
+    if (err) {
+      if (!Object.prototype.hasOwnProperty.call(err, 'metadata') && metadata) {
+        err.metadata = metadata;
+      }
+      this.sendError(err);
+      return;
+    }
+
+    try {
+      const response = this.serializeMessage(value!);
+
+      this.write(response);
+      this.sendStatus({ code: Status.OK, details: 'OK', metadata });
+    } catch (err) {
+      this.sendError({
+        details: getErrorMessage(err),
+        code: Status.INTERNAL,
+      });
+    }
+  }
+
+  sendStatus(statusObj: PartialStatusObject) {
+    this.emit('callEnd', statusObj.code);
+    this.emit('streamEnd', statusObj.code === Status.OK);
+    if (this.checkCancelled()) {
+      return;
+    }
+
+    trace(
+      'Request to method ' +
+        this.handler?.path +
+        ' ended with status code: ' +
+        Status[statusObj.code] +
+        ' details: ' +
+        statusObj.details
+    );
+
+    if (this.deadlineTimer) clearTimeout(this.deadlineTimer);
+
+    if (this.stream.headersSent) {
+      if (!this.wantTrailers) {
+        this.wantTrailers = true;
+        this.stream.once('wantTrailers', () => {
+          const trailersToSend = {
+            [GRPC_STATUS_HEADER]: statusObj.code,
+            [GRPC_MESSAGE_HEADER]: encodeURI(statusObj.details),
+            ...statusObj.metadata?.toHttp2Headers(),
+          };
+
+          this.stream.sendTrailers(trailersToSend);
+          this.statusSent = true;
+        });
+        this.stream.end();
+      }
+    } else {
+      // Trailers-only response
+      const trailersToSend = {
+        [GRPC_STATUS_HEADER]: statusObj.code,
+        [GRPC_MESSAGE_HEADER]: encodeURI(statusObj.details),
+        ...defaultResponseHeaders,
+        ...statusObj.metadata?.toHttp2Headers(),
+      };
+      this.stream.respond(trailersToSend, { endStream: true });
+      this.statusSent = true;
+    }
+  }
+
+  sendError(error: ServerErrorResponse | ServerStatusResponse) {
+    const status: PartialStatusObject = {
+      code: Status.UNKNOWN,
+      details: 'message' in error ? error.message : 'Unknown Error',
+      metadata:
+        'metadata' in error && error.metadata !== undefined
+          ? error.metadata
+          : null,
+    };
+
+    if (
+      'code' in error &&
+      typeof error.code === 'number' &&
+      Number.isInteger(error.code)
+    ) {
+      status.code = error.code;
+
+      if ('details' in error && typeof error.details === 'string') {
+        status.details = error.details!;
+      }
+    }
+
+    this.sendStatus(status);
+  }
+
+  write(chunk: Buffer) {
+    if (this.checkCancelled()) {
+      return;
+    }
+
+    if (
+      this.maxSendMessageSize !== -1 &&
+      chunk.length > this.maxSendMessageSize
+    ) {
+      this.sendError({
+        code: Status.RESOURCE_EXHAUSTED,
+        details: `Sent message larger than max (${chunk.length} vs. ${this.maxSendMessageSize})`,
+      });
+      return;
+    }
+
+    this.sendMetadata();
+    this.emit('sendMessage');
+    return this.stream.write(chunk);
+  }
+
+  resume() {
+    this.stream.resume();
+  }
+
+  setupSurfaceCall(call: ServerSurfaceCall) {
+    this.once('cancelled', reason => {
+      call.cancelled = true;
+      call.emit('cancelled', reason);
+    });
+
+    this.once('callEnd', status => call.emit('callEnd', status));
+  }
+
+  setupReadable(
+    readable:
+      | ServerReadableStream<RequestType, ResponseType>
+      | ServerDuplexStream<RequestType, ResponseType>,
+    encoding: string
+  ) {
+    const decoder = new StreamDecoder(this.maxReceiveMessageSize);
+
+    let readsDone = false;
+
+    let pendingMessageProcessing = false;
+
+    let pushedEnd = false;
+
+    const maybePushEnd = async () => {
+      if (!pushedEnd && readsDone && !pendingMessageProcessing) {
+        pushedEnd = true;
+        await this.pushOrBufferMessage(readable, null);
+      }
+    };
+
+    this.stream.on('data', async (data: Buffer) => {
+      let messages: Buffer[];
+      try {
+        messages = decoder.write(data);
+      } catch (e) {
+        this.sendError({
+          code: Status.RESOURCE_EXHAUSTED,
+          details: (e as Error).message
+        });
+        return;
+      }
+
+      pendingMessageProcessing = true;
+      this.stream.pause();
+      for (const message of messages) {
+        this.emit('receiveMessage');
+
+        const compressed = message.readUInt8(0) === 1;
+        const compressedMessageEncoding = compressed ? encoding : 'identity';
+        let decompressedMessage: Buffer;
+        try {
+          decompressedMessage = await this.getDecompressedMessage(
+            message,
+            compressedMessageEncoding
+          );
+        } catch (e) {
+          this.sendError(e as Partial<StatusObject>);
+          return;
+        }
+
+        // Encountered an error with decompression; it'll already have been propogated back
+        // Just return early
+        if (!decompressedMessage) return;
+
+        await this.pushOrBufferMessage(readable, decompressedMessage);
+      }
+      pendingMessageProcessing = false;
+      this.stream.resume();
+      await maybePushEnd();
+    });
+
+    this.stream.once('end', async () => {
+      readsDone = true;
+      await maybePushEnd();
+    });
+  }
+
+  consumeUnpushedMessages(
+    readable:
+      | ServerReadableStream<RequestType, ResponseType>
+      | ServerDuplexStream<RequestType, ResponseType>
+  ): boolean {
+    this.canPush = true;
+
+    while (this.messagesToPush.length > 0) {
+      const nextMessage = this.messagesToPush.shift();
+      const canPush = readable.push(nextMessage);
+
+      if (nextMessage === null || canPush === false) {
+        this.canPush = false;
+        break;
+      }
+    }
+
+    return this.canPush;
+  }
+
+  private async pushOrBufferMessage(
+    readable:
+      | ServerReadableStream<RequestType, ResponseType>
+      | ServerDuplexStream<RequestType, ResponseType>,
+    messageBytes: Buffer | null
+  ): Promise<void> {
+    if (this.isPushPending) {
+      this.bufferedMessages.push(messageBytes);
+    } else {
+      await this.pushMessage(readable, messageBytes);
+    }
+  }
+
+  private async pushMessage(
+    readable:
+      | ServerReadableStream<RequestType, ResponseType>
+      | ServerDuplexStream<RequestType, ResponseType>,
+    messageBytes: Buffer | null
+  ) {
+    if (messageBytes === null) {
+      trace('Received end of stream');
+      if (this.canPush) {
+        readable.push(null);
+      } else {
+        this.messagesToPush.push(null);
+      }
+
+      return;
+    }
+
+    trace('Received message of length ' + messageBytes.length);
+
+    this.isPushPending = true;
+
+    try {
+      const deserialized = await this.deserializeMessage(messageBytes);
+
+      if (this.canPush) {
+        if (!readable.push(deserialized)) {
+          this.canPush = false;
+          this.stream.pause();
+        }
+      } else {
+        this.messagesToPush.push(deserialized);
+      }
+    } catch (error) {
+      // Ignore any remaining messages when errors occur.
+      this.bufferedMessages.length = 0;
+      let code = getErrorCode(error);
+      if (code === null || code < Status.OK || code > Status.UNAUTHENTICATED) {
+        code = Status.INTERNAL;
+      }
+
+      readable.emit('error', {
+        details: getErrorMessage(error),
+        code: code,
+      });
+    }
+
+    this.isPushPending = false;
+
+    if (this.bufferedMessages.length > 0) {
+      await this.pushMessage(
+        readable,
+        this.bufferedMessages.shift() as Buffer | null
+      );
+    }
+  }
+
+  getPeer(): string {
+    const socket = this.stream.session?.socket;
+    if (socket?.remoteAddress) {
+      if (socket.remotePort) {
+        return `${socket.remoteAddress}:${socket.remotePort}`;
+      } else {
+        return socket.remoteAddress;
+      }
+    } else {
+      return 'unknown';
+    }
+  }
+
+  getDeadline(): Deadline {
+    return this.deadline;
+  }
+
+  getPath(): string {
+    return this.handler.path;
+  }
+}
+
+/* eslint-disable @typescript-eslint/no-explicit-any */
+type UntypedServerCall = Http2ServerCallStream<any, any>;
+
+function handleExpiredDeadline(call: UntypedServerCall) {
+  const err = new Error('Deadline exceeded') as ServerErrorResponse;
+  err.code = Status.DEADLINE_EXCEEDED;
+
+  call.sendError(err);
+  call.cancelled = true;
+  call.emit('cancelled', 'deadline');
+}