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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { EventEmitter } from 'events';
import {
EVENT_API_ERROR,
EVENT_API_RESPONSE,
EVENT_TOOL_CALL,
} from './constants.js';
import { ToolCallDecision } from './tool-call-decision.js';
import { ApiErrorEvent, ApiResponseEvent, ToolCallEvent } from './types.js';
export type UiEvent =
| (ApiResponseEvent & { 'event.name': typeof EVENT_API_RESPONSE })
| (ApiErrorEvent & { 'event.name': typeof EVENT_API_ERROR })
| (ToolCallEvent & { 'event.name': typeof EVENT_TOOL_CALL });
export interface ToolCallStats {
count: number;
success: number;
fail: number;
durationMs: number;
decisions: {
[ToolCallDecision.ACCEPT]: number;
[ToolCallDecision.REJECT]: number;
[ToolCallDecision.MODIFY]: number;
[ToolCallDecision.AUTO_ACCEPT]: number;
};
}
export interface ModelMetrics {
api: {
totalRequests: number;
totalErrors: number;
totalLatencyMs: number;
};
tokens: {
prompt: number;
candidates: number;
total: number;
cached: number;
thoughts: number;
tool: number;
};
}
export interface SessionMetrics {
models: Record<string, ModelMetrics>;
tools: {
totalCalls: number;
totalSuccess: number;
totalFail: number;
totalDurationMs: number;
totalDecisions: {
[ToolCallDecision.ACCEPT]: number;
[ToolCallDecision.REJECT]: number;
[ToolCallDecision.MODIFY]: number;
[ToolCallDecision.AUTO_ACCEPT]: number;
};
byName: Record<string, ToolCallStats>;
};
files: {
totalLinesAdded: number;
totalLinesRemoved: number;
};
}
const createInitialModelMetrics = (): ModelMetrics => ({
api: {
totalRequests: 0,
totalErrors: 0,
totalLatencyMs: 0,
},
tokens: {
prompt: 0,
candidates: 0,
total: 0,
cached: 0,
thoughts: 0,
tool: 0,
},
});
const createInitialMetrics = (): SessionMetrics => ({
models: {},
tools: {
totalCalls: 0,
totalSuccess: 0,
totalFail: 0,
totalDurationMs: 0,
totalDecisions: {
[ToolCallDecision.ACCEPT]: 0,
[ToolCallDecision.REJECT]: 0,
[ToolCallDecision.MODIFY]: 0,
[ToolCallDecision.AUTO_ACCEPT]: 0,
},
byName: {},
},
files: {
totalLinesAdded: 0,
totalLinesRemoved: 0,
},
});
export class UiTelemetryService extends EventEmitter {
#metrics: SessionMetrics = createInitialMetrics();
#lastPromptTokenCount = 0;
addEvent(event: UiEvent) {
switch (event['event.name']) {
case EVENT_API_RESPONSE:
this.processApiResponse(event);
break;
case EVENT_API_ERROR:
this.processApiError(event);
break;
case EVENT_TOOL_CALL:
this.processToolCall(event);
break;
default:
// We should not emit update for any other event metric.
return;
}
this.emit('update', {
metrics: this.#metrics,
lastPromptTokenCount: this.#lastPromptTokenCount,
});
}
getMetrics(): SessionMetrics {
return this.#metrics;
}
getLastPromptTokenCount(): number {
return this.#lastPromptTokenCount;
}
resetLastPromptTokenCount(): void {
this.#lastPromptTokenCount = 0;
this.emit('update', {
metrics: this.#metrics,
lastPromptTokenCount: this.#lastPromptTokenCount,
});
}
private getOrCreateModelMetrics(modelName: string): ModelMetrics {
if (!this.#metrics.models[modelName]) {
this.#metrics.models[modelName] = createInitialModelMetrics();
}
return this.#metrics.models[modelName];
}
private processApiResponse(event: ApiResponseEvent) {
const modelMetrics = this.getOrCreateModelMetrics(event.model);
modelMetrics.api.totalRequests++;
modelMetrics.api.totalLatencyMs += event.duration_ms;
modelMetrics.tokens.prompt += event.input_token_count;
modelMetrics.tokens.candidates += event.output_token_count;
modelMetrics.tokens.total += event.total_token_count;
modelMetrics.tokens.cached += event.cached_content_token_count;
modelMetrics.tokens.thoughts += event.thoughts_token_count;
modelMetrics.tokens.tool += event.tool_token_count;
this.#lastPromptTokenCount = event.input_token_count;
}
private processApiError(event: ApiErrorEvent) {
const modelMetrics = this.getOrCreateModelMetrics(event.model);
modelMetrics.api.totalRequests++;
modelMetrics.api.totalErrors++;
modelMetrics.api.totalLatencyMs += event.duration_ms;
}
private processToolCall(event: ToolCallEvent) {
const { tools, files } = this.#metrics;
tools.totalCalls++;
tools.totalDurationMs += event.duration_ms;
if (event.success) {
tools.totalSuccess++;
} else {
tools.totalFail++;
}
if (!tools.byName[event.function_name]) {
tools.byName[event.function_name] = {
count: 0,
success: 0,
fail: 0,
durationMs: 0,
decisions: {
[ToolCallDecision.ACCEPT]: 0,
[ToolCallDecision.REJECT]: 0,
[ToolCallDecision.MODIFY]: 0,
[ToolCallDecision.AUTO_ACCEPT]: 0,
},
};
}
const toolStats = tools.byName[event.function_name];
toolStats.count++;
toolStats.durationMs += event.duration_ms;
if (event.success) {
toolStats.success++;
} else {
toolStats.fail++;
}
if (event.decision) {
tools.totalDecisions[event.decision]++;
toolStats.decisions[event.decision]++;
}
// Aggregate line count data from metadata
if (event.metadata) {
if (event.metadata['ai_added_lines'] !== undefined) {
files.totalLinesAdded += event.metadata['ai_added_lines'];
}
if (event.metadata['ai_removed_lines'] !== undefined) {
files.totalLinesRemoved += event.metadata['ai_removed_lines'];
}
}
}
}
export const uiTelemetryService = new UiTelemetryService();
|
