Revert "src/goDebugConfiguration: change remote/attach default to dlv-dap"

This reverts commit 60c8ec9.

Reason for revert: Need to address path mapping issue: #3175

Change-Id: I9422ab3feaad91ae7f44de90bb3fa3ffbe353278
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/576635
kokoro-CI: kokoro <noreply+kokoro@google.com>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Commit-Queue: Suzy Mueller <suzmue@golang.org>

Author: suzmue

extension/src/goDebugConfiguration.ts

@@ -183,36 +183,25 @@ export class GoDebugConfigurationProvider implements vscode.DebugConfigurationPr
 			}
 		}
 		// If neither launch.json nor settings.json gave us the debugAdapter value, we go with the default
-		// from package.json (dlv-dap).
+		// from package.json (dlv-dap) unless this is remote attach with a stable release.
 		if (!debugConfiguration['debugAdapter']) {
 			debugConfiguration['debugAdapter'] = defaultConfig.debugAdapter.default;
-			if (
-				debugConfiguration.request === 'attach' &&
-				debugConfiguration['mode'] === 'remote' &&
-				!extensionInfo.isPreview
-			) {
+			if (debugConfiguration['mode'] === 'remote' && !extensionInfo.isPreview) {
+				debugConfiguration['debugAdapter'] = 'legacy';
+			}
+		}
+		if (debugConfiguration['debugAdapter'] === 'dlv-dap') {
+			if (debugConfiguration['mode'] === 'remote') {
+				// This needs to use dlv at version 'v1.7.3-0.20211026171155-b48ceec161d5' or later,
+				// but we have no way of detectng that with an external server ahead of time.
+				// If an earlier version is used, the attach will fail with  warning about versions.
+			} else if (debugConfiguration['port']) {
 				this.showWarning(
-					'ignoreDefaultDebugAdapterChangeWarning',
-					"We are using the 'dlv-dap' integration for remote debugging by default. Please comment on [issue 3096](https://github.com/golang/vscode-go/issues/3096) if this impacts your workflows."
+					'ignorePortUsedInDlvDapWarning',
+					"`port` with 'dlv-dap' debugAdapter connects to [an external `dlv dap` server](https://github.com/golang/vscode-go/blob/master/docs/debugging.md#running-debugee-externally) to launch a program or attach to a process. Remove 'host' and 'port' from your launch.json if you have not launched a 'dlv dap' server."
 				);
 			}
 		}
-		if (debugConfiguration['debugAdapter'] === 'legacy') {
-			this.showWarning(
-				'ignoreLegacyDADeprecationWarning',
-				'Legacy debug adapter is deprecated. Please comment on [issue 3096](https://github.com/golang/vscode-go/issues/3096) if this impacts your workflows.'
-			);
-		}
-		if (
-			debugConfiguration['debugAdapter'] === 'dlv-dap' &&
-			debugConfiguration.request === 'launch' &&
-			debugConfiguration['port']
-		) {
-			this.showWarning(
-				'ignorePortUsedInDlvDapWarning',
-				"`port` with 'dlv-dap' debugAdapter connects to [a `dlv dap` server](https://github.com/golang/vscode-go/wiki/debugging#run-debugee-externally) to launch a program or attach to a process. Remove 'host'/'port' from your launch.json configuration if you have not launched a 'dlv dap' server."
-			);
-		}
 
 		const debugAdapter = debugConfiguration['debugAdapter'] === 'dlv-dap' ? 'dlv-dap' : 'dlv';
 

extension/test/integration/goDebug.test.ts

@@ -42,10 +42,9 @@ const testAll = (ctx: Mocha.Context, isDlvDap: boolean, withConsole?: string) =>
 		name: 'Attach',
 		type: 'go',
 		request: 'attach',
-		mode: 'remote',
+		mode: 'remote', // This implies debugAdapter = legacy.
 		host: '127.0.0.1',
-		port: 3456,
-		debugAdapter: isDlvDap ? undefined : 'legacy'
+		port: 3456
 	};
 
 	let dc: DebugClient;

extension/test/integration/goDebugConfiguration.test.ts

@@ -951,7 +951,7 @@ suite('Debug Configuration Default DebugAdapter', () => {
 		assert.strictEqual(resolvedConfig['debugAdapter'], 'dlv-dap');
 	});
 
-	test("default debugAdapter for remote mode should be 'dlv-dap'", async () => {
+	test("default debugAdapter for remote mode should be 'legacy' when not in Preview mode", async () => {
 		const config = {
 			name: 'Attach',
 			type: 'go',
@@ -961,24 +961,24 @@ suite('Debug Configuration Default DebugAdapter', () => {
 			cwd: '/path'
 		};
 
-		const want = 'dlv-dap';
+		const want = extensionInfo.isPreview ? 'dlv-dap' : 'legacy';
 		await debugConfigProvider.resolveDebugConfiguration(undefined, config);
 		const resolvedConfig = config as any;
 		assert.strictEqual(resolvedConfig['debugAdapter'], want);
 	});
 
-	test('debugAdapter=legacy is allowed with remote mode', async () => {
+	test('debugAdapter=dlv-dap is allowed with remote mode', async () => {
 		const config = {
 			name: 'Attach',
 			type: 'go',
 			request: 'attach',
 			mode: 'remote',
-			debugAdapter: 'legacy',
+			debugAdapter: 'dlv-dap',
 			program: '/path/to/main_test.go',
 			cwd: '/path'
 		};
 
-		const want = 'legacy'; // If requested, legacy is preserved.
+		const want = 'dlv-dap'; // If requested, dlv-dap is preserved.
 		await debugConfigProvider.resolveDebugConfiguration(undefined, config);
 		const resolvedConfig = config as any;
 		assert.strictEqual(resolvedConfig['debugAdapter'], want);