Add "CodeQL: Trim Cache" command that calls evaluation/trimCache

extensions/ql-vscode/CHANGELOG.md

@@ -11,6 +11,7 @@
 - Increase the required version of VS Code to 1.82.0. [#2877](https://github.com/github/vscode-codeql/pull/2877)
 - Fix a bug where the query server was restarted twice after configuration changes. [#2884](https://github.com/github/vscode-codeql/pull/2884).
 - Add support for the `telemetry.telemetryLevel` setting. For more information, see the [telemetry documentation](https://codeql.github.com/docs/codeql-for-visual-studio-code/about-telemetry-in-codeql-for-visual-studio-code). [#2824](https://github.com/github/vscode-codeql/pull/2824).
+- Add a "CodeQL: Trim Cache" command that clears the evaluation cache of a database except for predicates annotated with the `cached` keyword. Its purpose is to get accurate performance measurements when tuning the final stage of a query, like a data-flow configuration. This is equivalent to the `codeql database cleanup --mode=normal` CLI command. In contrast, the existing "CodeQL: Clear Cache" command clears the entire cache. CodeQL CLI v2.15.1 or later is required. [#2928](https://github.com/github/vscode-codeql/pull/2928)
 - Fix syntax highlighting directly after import statements with instantiation arguments. [#2792](https://github.com/github/vscode-codeql/pull/2792)
 - The `debug.saveBeforeStart` setting is now respected when running variant analyses. [#2950](https://github.com/github/vscode-codeql/pull/2950)
 - The 'open database' button of the model editor was renamed to 'open source'. Also, it's now only available if the source archive is available as a workspace folder. [#2945](https://github.com/github/vscode-codeql/pull/2945)

extensions/ql-vscode/package.json

@@ -712,6 +712,10 @@
         "command": "codeQL.clearCache",
         "title": "CodeQL: Clear Cache"
       },
+      {
+        "command": "codeQL.trimCache",
+        "title": "CodeQL: Trim Cache"
+      },
       {
         "command": "codeQL.installPackDependencies",
         "title": "CodeQL: Install Pack Dependencies"
@@ -1806,6 +1810,10 @@
         {
           "command": "codeQL.gotoQLContextEditor",
           "when": "false"
+        },
+        {
+          "command": "codeQL.trimCache",
+          "when": "codeql.supportsTrimCache"
         }
       ],
       "editor/context": [

extensions/ql-vscode/src/codeql-cli/cli.ts

@@ -1492,6 +1492,13 @@ export class CodeQLCliServer implements Disposable {
             CliVersionConstraint.CLI_VERSION_WITH_QUICK_EVAL_COUNT,
           ) >= 0,
         );
+        await this.app.commands.execute(
+          "setContext",
+          "codeql.supportsTrimCache",
+          newVersion.compare(
+            CliVersionConstraint.CLI_VERSION_WITH_TRIM_CACHE,
+          ) >= 0,
+        );
       } catch (e) {
         this._versionChangedListeners.forEach((listener) =>
           listener(undefined),
@@ -1755,6 +1762,12 @@ export class CliVersionConstraint {
     "2.14.0",
   );
 
+  /**
+   * CLI version where the query server supports the `evaluation/trimCache` method
+   * with `codeql database cleanup --mode=trim` semantics.
+   */
+  public static CLI_VERSION_WITH_TRIM_CACHE = new SemVer("2.15.1");
+
   constructor(private readonly cli: CodeQLCliServer) {
     /**/
   }

extensions/ql-vscode/src/common/commands.ts

@@ -207,6 +207,7 @@ export type LocalDatabasesCommands = {
   "codeQL.chooseDatabaseGithub": () => Promise<void>;
   "codeQL.upgradeCurrentDatabase": () => Promise<void>;
   "codeQL.clearCache": () => Promise<void>;
+  "codeQL.trimCache": () => Promise<void>;
 
   // Explorer context menu
   "codeQL.setCurrentDatabase": (uri: Uri) => Promise<void>;

extensions/ql-vscode/src/databases/local-databases-ui.ts

@@ -252,6 +252,7 @@ export class DatabaseUI extends DisposableObject {
       "codeQL.upgradeCurrentDatabase":
         this.handleUpgradeCurrentDatabase.bind(this),
       "codeQL.clearCache": this.handleClearCache.bind(this),
+      "codeQL.trimCache": this.handleTrimCache.bind(this),
       "codeQLDatabases.chooseDatabaseFolder":
         this.handleChooseDatabaseFolder.bind(this),
       "codeQLDatabases.chooseDatabaseArchive":
@@ -703,6 +704,25 @@ export class DatabaseUI extends DisposableObject {
     );
   }
 
+  private async handleTrimCache(): Promise<void> {
+    return withProgress(
+      async (_progress, token) => {
+        if (
+          this.queryServer !== undefined &&
+          this.databaseManager.currentDatabaseItem !== undefined
+        ) {
+          await this.queryServer.trimCacheInDatabase(
+            this.databaseManager.currentDatabaseItem,
+            token,
+          );
+        }
+      },
+      {
+        title: "Trimming cache",
+      },
+    );
+  }
+
   private async handleGetCurrentDatabase(): Promise<string | undefined> {
     const dbItem = await this.getDatabaseItemInternal(undefined);
     return dbItem?.databaseUri.fsPath;

extensions/ql-vscode/src/query-server/legacy/legacy-query-runner.ts

@@ -53,13 +53,23 @@ export class LegacyQueryRunner extends QueryRunner {
   ) {
     this.qs.onDidStartQueryServer(callBack);
   }
+
   async clearCacheInDatabase(
     dbItem: DatabaseItem,
     token: CancellationToken,
   ): Promise<void> {
     await clearCacheInDatabase(this.qs, dbItem, token);
   }
 
+  async trimCacheInDatabase(
+    dbItem: DatabaseItem,
+    token: CancellationToken,
+  ): Promise<void> {
+    // For the sake of conforming to the QueryRunner interface, delegate to clearCacheInDatabase
+    // just for the effect of getting a legacy query server deprecation error response.
+    await clearCacheInDatabase(this.qs, dbItem, token);
+  }
+
   public async compileAndRunQueryAgainstDatabaseCore(
     dbPath: string,
     query: CoreQueryTarget,

extensions/ql-vscode/src/query-server/new-query-runner.ts

@@ -10,6 +10,8 @@ import {
   clearPackCache,
   deregisterDatabases,
   registerDatabases,
+  trimCache,
+  TrimCacheParams,
   upgradeDatabase,
 } from "./new-messages";
 import { CoreQueryResults, CoreQueryTarget, QueryRunner } from "./query-runner";
@@ -70,6 +72,21 @@ export class NewQueryRunner extends QueryRunner {
     await this.qs.sendRequest(clearCache, params, token);
   }
 
+  async trimCacheInDatabase(
+    dbItem: DatabaseItem,
+    token: CancellationToken,
+  ): Promise<void> {
+    if (dbItem.contents === undefined) {
+      throw new Error("Can't trim the cache in an invalid database.");
+    }
+
+    const db = dbItem.databaseUri.fsPath;
+    const params: TrimCacheParams = {
+      db,
+    };
+    await this.qs.sendRequest(trimCache, params, token);
+  }
+
   public async compileAndRunQueryAgainstDatabaseCore(
     dbPath: string,
     query: CoreQueryTarget,

extensions/ql-vscode/src/query-server/query-runner.ts

@@ -67,6 +67,11 @@ export abstract class QueryRunner {
     token: CancellationToken,
   ): Promise<void>;
 
+  abstract trimCacheInDatabase(
+    dbItem: DatabaseItem,
+    token: CancellationToken,
+  ): Promise<void>;
+
   /**
    * Overridden in subclasses to evaluate the query via the query server and return the results.
    */