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import { ToolCallEvent, HistoryItem } from '../ui/types.js';
import { Part } from '@google/genai';
import {
handleToolCallChunk,
addErrorMessageToHistory,
} from './history-updater.js';
export enum GeminiEventType {
Content,
ToolCallInfo,
}
export interface GeminiContentEvent {
type: GeminiEventType.Content;
value: string;
}
export interface GeminiToolCallInfoEvent {
type: GeminiEventType.ToolCallInfo;
value: ToolCallEvent;
}
export type GeminiEvent = GeminiContentEvent | GeminiToolCallInfoEvent;
export type GeminiStream = AsyncIterable<GeminiEvent>;
export enum StreamingState {
Idle,
Responding,
}
interface StreamProcessorParams {
stream: GeminiStream;
signal: AbortSignal;
setHistory: React.Dispatch<React.SetStateAction<HistoryItem[]>>;
submitQuery: (query: Part) => Promise<void>;
getNextMessageId: () => number;
addHistoryItem: (itemData: Omit<HistoryItem, 'id'>, id: number) => void;
currentToolGroupIdRef: React.MutableRefObject<number | null>;
}
/**
* Processes the Gemini stream, managing text buffering, adaptive rendering,
* and delegating history updates for tool calls and errors.
*/
export const processGeminiStream = async ({
// Renamed function for clarity
stream,
signal,
setHistory,
submitQuery,
getNextMessageId,
addHistoryItem,
currentToolGroupIdRef,
}: StreamProcessorParams): Promise<void> => {
// --- State specific to this stream processing invocation ---
let textBuffer = '';
let renderTimeoutId: NodeJS.Timeout | null = null;
let isStreamComplete = false;
let currentGeminiMessageId: number | null = null;
const render = (content: string) => {
if (currentGeminiMessageId === null) {
return;
}
setHistory((prev) =>
prev.map((item) =>
item.id === currentGeminiMessageId && item.type === 'gemini'
? { ...item, text: (item.text ?? '') + content }
: item,
),
);
};
// --- Adaptive Rendering Logic (nested) ---
const renderBufferedText = () => {
if (signal.aborted) {
if (renderTimeoutId) clearTimeout(renderTimeoutId);
renderTimeoutId = null;
return;
}
const bufferLength = textBuffer.length;
let chunkSize = 0;
let delay = 50;
if (bufferLength > 150) {
chunkSize = Math.min(bufferLength, 30);
delay = 5;
} else if (bufferLength > 30) {
chunkSize = Math.min(bufferLength, 10);
delay = 10;
} else if (bufferLength > 0) {
chunkSize = 2;
delay = 20;
}
if (chunkSize > 0) {
const chunkToRender = textBuffer.substring(0, chunkSize);
textBuffer = textBuffer.substring(chunkSize);
render(chunkToRender);
renderTimeoutId = setTimeout(renderBufferedText, delay);
} else {
renderTimeoutId = null; // Clear timeout ID if nothing to render
if (!isStreamComplete) {
// Buffer empty, but stream might still send data, check again later
renderTimeoutId = setTimeout(renderBufferedText, 50);
}
}
};
const scheduleRender = () => {
if (renderTimeoutId === null) {
renderTimeoutId = setTimeout(renderBufferedText, 0);
}
};
// --- Stream Processing Loop ---
try {
for await (const chunk of stream) {
if (signal.aborted) break;
if (chunk.type === GeminiEventType.Content) {
currentToolGroupIdRef.current = null; // Reset tool group on text
if (currentGeminiMessageId === null) {
currentGeminiMessageId = getNextMessageId();
addHistoryItem({ type: 'gemini', text: '' }, currentGeminiMessageId);
textBuffer = '';
}
textBuffer += chunk.value;
scheduleRender();
} else if (chunk.type === GeminiEventType.ToolCallInfo) {
if (renderTimeoutId) {
// Stop rendering loop
clearTimeout(renderTimeoutId);
renderTimeoutId = null;
}
// Flush any text buffer content.
render(textBuffer);
currentGeminiMessageId = null; // End text message context
textBuffer = ''; // Clear buffer
// Delegate history update for tool call
handleToolCallChunk(
chunk.value,
setHistory,
submitQuery,
getNextMessageId,
currentToolGroupIdRef,
);
}
}
if (signal.aborted) {
throw new Error('Request cancelled by user');
}
} catch (error: unknown) {
if (renderTimeoutId) {
// Ensure render loop stops on error
clearTimeout(renderTimeoutId);
renderTimeoutId = null;
}
// Delegate history update for error message
addErrorMessageToHistory(
error as Error | DOMException,
setHistory,
getNextMessageId,
);
} finally {
isStreamComplete = true; // Signal stream end for render loop completion
if (renderTimeoutId) {
clearTimeout(renderTimeoutId);
renderTimeoutId = null;
}
renderBufferedText(); // Force final render
}
};
|
