Update language server to use named pipe client

package.json

@@ -37,7 +37,7 @@
     }
   },
   "defaults": {
-    "roslyn": "4.8.0-3.23458.4",
+    "roslyn": "4.8.0-3.23463.5",
     "omniSharp": "1.39.7",
     "razor": "7.0.0-preview.23456.2",
     "razorOmnisharp": "7.0.0-preview.23363.1"
@@ -4992,4 +4992,4 @@
       }
     ]
   }
-}
+}

src/lsptoolshost/roslynLanguageServer.ts

@@ -8,6 +8,7 @@ import * as fs from 'fs';
 import * as path from 'path';
 import * as cp from 'child_process';
 import * as uuid from 'uuid';
+import * as net from 'net';
 import { registerCommands } from './commands';
 import { registerDebugger } from './debugger';
 import { UriConverter } from './uriConverter';
@@ -21,6 +22,10 @@ import {
     RequestType0,
     PartialResultParams,
     ProtocolRequestType,
+    SocketMessageWriter,
+    SocketMessageReader,
+    MessageTransports,
+    RAL,
 } from 'vscode-languageclient/node';
 import { PlatformInformation } from '../shared/platform';
 import { readConfigurations } from './configurationMiddleware';
@@ -49,6 +54,7 @@ import { RoslynLanguageServerEvents } from './languageServerEvents';
 import { registerShowToastNotification } from './showToastNotification';
 import { registerRazorCommands } from './razorCommands';
 import { registerOnAutoInsert } from './onAutoInsert';
+import { NamedPipeInformation } from './roslynProtocol';
 
 let _channel: vscode.OutputChannel;
 let _traceChannel: vscode.OutputChannel;
@@ -62,6 +68,16 @@ export class RoslynLanguageServer {
     private static readonly provideRazorDynamicFileInfoMethodName: string = 'razor/provideDynamicFileInfo';
     private static readonly removeRazorDynamicFileInfoMethodName: string = 'razor/removeDynamicFileInfo';
 
+    /**
+     * The encoding to use when writing to and from the stream.
+     */
+    private static readonly encoding: RAL.MessageBufferEncoding = 'utf-8';
+
+    /**
+     * The regular expression used to find the named pipe key in the LSP server's stdout stream.
+     */
+    private static readonly namedPipeKeyRegex = /{"pipeName":"[^"]+"}/;
+
     /**
      * The timeout for stopping the language server (in ms).
      */
@@ -439,7 +455,7 @@ export class RoslynLanguageServer {
         context: vscode.ExtensionContext,
         telemetryReporter: TelemetryReporter,
         additionalExtensionPaths: string[]
-    ): Promise<cp.ChildProcess> {
+    ): Promise<MessageTransports> {
         const options = optionProvider.GetLatestOptions();
         const serverPath = getServerPath(options, platformInfo);
 
@@ -538,7 +554,57 @@ export class RoslynLanguageServer {
             childProcess = cp.spawn(serverPath, args, cpOptions);
         }
 
-        return childProcess;
+        // Timeout promise used to time out the connection process if it takes too long.
+        const timeout = new Promise<undefined>((resolve) => {
+            RAL().timer.setTimeout(resolve, 30000);
+        });
+
+        // The server process will create the named pipe used for communcation. Wait for it to be created,
+        // and listen for the server to pass back the connection information via stdout.
+        const namedPipeConnectionPromise = new Promise<NamedPipeInformation>((resolve) => {
+            _channel.appendLine('waiting for named pipe information from server...');
+            childProcess.stdout.on('data', (data: { toString: (arg0: any) => any }) => {
+                const result: string = isString(data) ? data : data.toString(RoslynLanguageServer.encoding);
+                _channel.append('[stdout] ' + result);
+
+                // Use the regular expression to find all JSON lines
+                const jsonLines = result.match(RoslynLanguageServer.namedPipeKeyRegex);
+                if (jsonLines) {
+                    const transmittedPipeNameInfo: NamedPipeInformation = JSON.parse(jsonLines[0]);
+                    _channel.appendLine('received named pipe information from server');
+                    resolve(transmittedPipeNameInfo);
+                }
+            });
+        });
+
+        // Wait for the server to send back the name of the pipe to connect to.
+        // If it takes too long it will timeout and throw an error.
+        const pipeConnectionInfo = await Promise.race([namedPipeConnectionPromise, timeout]);
+        if (pipeConnectionInfo === undefined) {
+            throw new Error('Timeout. Named pipe information not received from server.');
+        }
+
+        const socketPromise = new Promise<net.Socket>((resolve) => {
+            _channel.appendLine('attempting to connect client to server...');
+            const socket = net.createConnection(pipeConnectionInfo.pipeName, () => {
+                _channel.appendLine('client has connected to server');
+                resolve(socket);
+            });
+        });
+
+        // Wait for the client to connect to the named pipe.
+        // If it takes too long it will timeout and throw an error.
+        const socket = await Promise.race([socketPromise, timeout]);
+        if (socket === undefined) {
+            throw new Error(
+                'Timeout. Client cound not connect to server via named pipe: ' + pipeConnectionInfo.pipeName
+            );
+        }
+
+        return {
+            reader: new SocketMessageReader(socket, RoslynLanguageServer.encoding),
+            writer: new SocketMessageWriter(socket, RoslynLanguageServer.encoding),
+        };
     }
 
     private registerDynamicFileInfo() {
@@ -836,3 +902,7 @@ function getSessionId(): string {
 
     return sessionId;
 }
+
+export function isString(value: any): value is string {
+    return typeof value === 'string' || value instanceof String;
+}

src/lsptoolshost/roslynProtocol.ts

@@ -141,6 +141,10 @@ export interface BuildOnlyDiagnosticIdsResult {
     ids: string[];
 }
 
+export interface NamedPipeInformation {
+    pipeName: string;
+}
+
 export namespace WorkspaceDebugConfigurationRequest {
     export const method = 'workspace/debugConfiguration';
     export const messageDirection: lsp.MessageDirection = lsp.MessageDirection.clientToServer;