[Code] always enforce HEAD revision for indexing even when repo get updated during index (#39528)

x-pack/legacy/plugins/code/server/git_operations.ts

@@ -29,7 +29,7 @@ import { FileTree, FileTreeItemType, RepositoryUri, sortFileTree } from '../mode
 import { CommitInfo, ReferenceInfo, ReferenceType } from '../model/commit';
 import { detectLanguage } from './utils/detect_language';
 
-const HEAD = 'HEAD';
+export const HEAD = 'HEAD';
 const REFS_HEADS = 'refs/heads/';
 export const DEFAULT_TREE_CHILDREN_LIMIT = 50;
 
@@ -129,7 +129,7 @@ export class GitOperations {
 
   public async getCommit(uri: RepositoryUri, revision: string): Promise<Commit> {
     const repo = await this.openRepo(uri);
-    if (revision.toUpperCase() === 'HEAD') {
+    if (revision.toUpperCase() === HEAD) {
       return await repo.getHeadCommit();
     }
     // branches and tags

x-pack/legacy/plugins/code/server/indexer/lsp_incremental_indexer.ts

@@ -17,7 +17,7 @@ import {
   LspIncIndexRequest,
   RepositoryUri,
 } from '../../model';
-import { GitOperations } from '../git_operations';
+import { GitOperations, HEAD } from '../git_operations';
 import { EsClient } from '../lib/esqueue';
 import { Logger } from '../log';
 import { LspService } from '../lsp/lsp_service';
@@ -126,7 +126,7 @@ export class LspIncrementalIndexer extends LspIndexer {
     try {
       const { workspaceRepo } = await this.lspService.workspaceHandler.openWorkspace(
         this.repoUri,
-        'head'
+        HEAD
       );
       const workspaceDir = workspaceRepo.workdir();
       if (this.diff) {
@@ -136,7 +136,11 @@ export class LspIncrementalIndexer extends LspIndexer {
             localRepoPath: workspaceDir,
             filePath: f.path,
             originPath: f.originPath,
-            revision: this.revision,
+            // Always use HEAD for now until we have multi revision.
+            // Also, since the workspace might get updated during the index, we always
+            // want the revision to keep updated so that lsp proxy could pass the revision
+            // check per discussion here: https://github.com/elastic/code/issues/1317#issuecomment-504615833
+            revision: HEAD,
             kind: f.kind,
             originRevision: this.originRevision,
           };

x-pack/legacy/plugins/code/server/indexer/lsp_indexer.ts

@@ -17,7 +17,7 @@ import {
 } from '../../common/lsp_error_codes';
 import { toCanonicalUrl } from '../../common/uri_util';
 import { Document, IndexStats, IndexStatsKey, LspIndexRequest, RepositoryUri } from '../../model';
-import { GitOperations } from '../git_operations';
+import { GitOperations, HEAD } from '../git_operations';
 import { EsClient } from '../lib/esqueue';
 import { Logger } from '../log';
 import { LspService } from '../lsp/lsp_service';
@@ -103,20 +103,24 @@ export class LspIndexer extends AbstractIndexer {
   protected async *getIndexRequestIterator(): AsyncIterableIterator<LspIndexRequest> {
     let repo;
     try {
-      const {
-        workspaceRepo,
-        workspaceRevision,
-      } = await this.lspService.workspaceHandler.openWorkspace(this.repoUri, 'head');
+      const { workspaceRepo } = await this.lspService.workspaceHandler.openWorkspace(
+        this.repoUri,
+        HEAD
+      );
       repo = workspaceRepo;
       const workspaceDir = workspaceRepo.workdir();
-      const fileIterator = await this.gitOps.iterateRepo(this.repoUri, 'head');
+      const fileIterator = await this.gitOps.iterateRepo(this.repoUri, HEAD);
       for await (const file of fileIterator) {
         const filePath = file.path!;
         const req: LspIndexRequest = {
           repoUri: this.repoUri,
           localRepoPath: workspaceDir,
           filePath,
-          revision: workspaceRevision,
+          // Always use HEAD for now until we have multi revision.
+          // Also, since the workspace might get updated during the index, we always
+          // want the revision to keep updated so that lsp proxy could pass the revision
+          // check per discussion here: https://github.com/elastic/code/issues/1317#issuecomment-504615833
+          revision: HEAD,
         };
         yield req;
       }
@@ -133,7 +137,7 @@ export class LspIndexer extends AbstractIndexer {
 
   protected async getIndexRequestCount(): Promise<number> {
     try {
-      return await this.gitOps.countRepoFiles(this.repoUri, 'head');
+      return await this.gitOps.countRepoFiles(this.repoUri, HEAD);
     } catch (error) {
       if (this.isCancelled()) {
         this.log.debug(`Indexer got cancelled. Skip get index count error.`);

x-pack/legacy/plugins/code/server/queue/index_worker.ts

@@ -16,7 +16,7 @@ import {
   WorkerProgress,
   WorkerReservedProgress,
 } from '../../model';
-import { GitOperations } from '../git_operations';
+import { GitOperations, HEAD } from '../git_operations';
 import { IndexerFactory } from '../indexer';
 import { EsClient, Esqueue } from '../lib/esqueue';
 import { Logger } from '../log';
@@ -171,7 +171,7 @@ export class IndexWorker extends AbstractWorker {
 
   protected async getTimeoutMs(payload: any) {
     try {
-      const totalCount = await this.gitOps.countRepoFiles(payload.uri, 'head');
+      const totalCount = await this.gitOps.countRepoFiles(payload.uri, HEAD);
       let timeout = moment.duration(1, 'hour').asMilliseconds();
       if (totalCount > 0) {
         // timeout = ln(file_count) in hour