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import type {
AgentEvent,
StepId,
StepMetrics,
TurnDoneEvent,
TurnMetrics,
TurnStepCompleteEvent,
TurnUsageEvent,
Usage,
} from "@dispatch/kernel";
const zeroUsage: Usage = { inputTokens: 0, outputTokens: 0 };
interface StepAccumulator {
readonly stepId: StepId;
usage: Usage | undefined;
ttftMs: number | undefined;
decodeMs: number | undefined;
genTotalMs: number | undefined;
}
export interface MetricsAccumulator {
readonly ingest: (event: AgentEvent) => void;
readonly build: (turnId: string) => TurnMetrics;
readonly reset: () => void;
}
export function createMetricsAccumulator(): MetricsAccumulator {
const steps = new Map<StepId, StepAccumulator>();
const stepOrder: StepId[] = [];
let doneUsage: Usage | undefined;
let doneDurationMs: number | undefined;
function getOrCreateStep(stepId: StepId): StepAccumulator {
let acc = steps.get(stepId);
if (acc === undefined) {
acc = {
stepId,
usage: undefined,
ttftMs: undefined,
decodeMs: undefined,
genTotalMs: undefined,
};
steps.set(stepId, acc);
stepOrder.push(stepId);
}
return acc;
}
function ingest(event: AgentEvent): void {
switch (event.type) {
case "usage": {
const e = event as TurnUsageEvent;
if (e.stepId !== undefined) {
const acc = getOrCreateStep(e.stepId);
acc.usage = e.usage;
}
break;
}
case "step-complete": {
const e = event as TurnStepCompleteEvent;
const acc = getOrCreateStep(e.stepId);
acc.ttftMs = e.ttftMs;
acc.decodeMs = e.decodeMs;
acc.genTotalMs = e.genTotalMs;
break;
}
case "done": {
const e = event as TurnDoneEvent;
doneUsage = e.usage;
doneDurationMs = e.durationMs;
break;
}
}
}
function build(turnId: string): TurnMetrics {
const stepMetrics: StepMetrics[] = stepOrder.map((stepId) => {
const acc = steps.get(stepId);
if (acc === undefined) {
return { stepId, usage: zeroUsage };
}
const usage = acc.usage ?? zeroUsage;
const sm: StepMetrics = { stepId, usage };
if (acc.ttftMs !== undefined) {
(sm as { ttftMs?: number }).ttftMs = acc.ttftMs;
}
if (acc.decodeMs !== undefined) {
(sm as { decodeMs?: number }).decodeMs = acc.decodeMs;
}
if (acc.genTotalMs !== undefined) {
(sm as { genTotalMs?: number }).genTotalMs = acc.genTotalMs;
}
return sm;
});
const aggregateUsage = doneUsage ?? sumStepUsage(stepMetrics);
const tm: TurnMetrics = { turnId, usage: aggregateUsage, steps: stepMetrics };
if (doneDurationMs !== undefined) {
(tm as { durationMs?: number }).durationMs = doneDurationMs;
}
// contextSize = final step's inputTokens + outputTokens (true context occupancy).
// Omit when no steps or the last step had no usable per-step usage event.
if (stepMetrics.length > 0) {
const lastStep = stepMetrics[stepMetrics.length - 1];
if (lastStep !== undefined) {
const lastAcc = steps.get(lastStep.stepId);
if (lastAcc?.usage !== undefined) {
(tm as { contextSize?: number }).contextSize =
lastStep.usage.inputTokens + lastStep.usage.outputTokens;
}
}
}
return tm;
}
function reset(): void {
steps.clear();
stepOrder.length = 0;
doneUsage = undefined;
doneDurationMs = undefined;
}
return { ingest, build, reset };
}
function sumStepUsage(steps: readonly StepMetrics[]): Usage {
let inputTokens = 0;
let outputTokens = 0;
for (const s of steps) {
inputTokens += s.usage.inputTokens;
outputTokens += s.usage.outputTokens;
}
return { inputTokens, outputTokens };
}
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