feat: Implement rate limit configuration for Gemini embedder and add control in settings

Author: ChuKhaLi

src/services/code-index/embedders/gemini.ts

@@ -112,12 +112,12 @@ export class CodeIndexGeminiEmbedder extends GeminiHandler implements IEmbedder
 
 			// Process the current batch if not empty
 			if (currentBatch.length > 0) {
-				// Add proactive delay for rate limiting, except for the very first batch.
-				if (!isFirstBatch) {
-					console.log(`Adding proactive delay of ${GEMINI_RATE_LIMIT_DELAY_MS}ms before Gemini batch`)
-					await new Promise((resolve) => setTimeout(resolve, GEMINI_RATE_LIMIT_DELAY_MS))
-				}
-				isFirstBatch = false // Set to false after the first potential delay or first run
+				const delayMs =
+					this.options.rateLimitSeconds !== undefined
+						? this.options.rateLimitSeconds * 1000
+						: GEMINI_RATE_LIMIT_DELAY_MS
+				console.log(`Adding proactive delay of ${delayMs}ms before Gemini batch`)
+				await new Promise((resolve) => setTimeout(resolve, delayMs))
 
 				try {
 					const batchResult = await this._embedBatchWithRetries(currentBatch, model, taskType)

webview-ui/src/components/settings/CodeIndexSettings.tsx

@@ -30,6 +30,7 @@ import {
 } from "@src/components/ui"
 
 import { SetCachedStateField } from "./types"
+import { RateLimitSecondsControl } from "./RateLimitSecondsControl"
 
 interface CodeIndexSettingsProps {
 	codebaseIndexModels: CodebaseIndexModels | undefined
@@ -401,6 +402,12 @@ export const CodeIndexSettings: React.FC<CodeIndexSettingsProps> = ({
 									</div>
 								</div>
 							</div>
+							<div className="flex flex-col gap-3">
+								<RateLimitSecondsControl
+									value={apiConfiguration.rateLimitSeconds || 0}
+									onChange={(value) => setApiConfigurationField("rateLimitSeconds", value)}
+								/>
+							</div>
 						</>
 					)}