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Merged
bezbac merged 1 commit into from
Aug 20, 2026
Merged

Link child sessions to parent traces #27

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30 changes: 24 additions & 6 deletions src/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -150,16 +150,21 @@ const eventHook = (event: OpencodeEvent, shutdown?: () => Promise<void>) =>
Effect.gen(function* () {
const langfuse = yield* LangfuseClientService;

const finalizeSessionTracing = () => {
langfuse.endActiveToolObservations();
langfuse.endActiveGenerationSteps();
langfuse.endActiveTurnObservations();
langfuse.clearTraceState();
const finalizeSessionTracing = (sessionID?: string) => {
langfuse.endActiveToolObservations(sessionID);
langfuse.endActiveGenerationSteps(sessionID);
langfuse.endActiveTurnObservations(sessionID);

if (sessionID) {
langfuse.clearSessionTraceState(sessionID);
} else {
langfuse.clearTraceState();
}
};

if (event.type === "session.idle") {
yield* log("info", "Flushing spans");
finalizeSessionTracing();
finalizeSessionTracing(event.properties.sessionID);

yield* langfuse.forceFlush;
}
Expand All @@ -175,6 +180,19 @@ const eventHook = (event: OpencodeEvent, shutdown?: () => Promise<void>) =>
}
}

if (event.type === "session.created" || event.type === "session.updated") {
langfuse.rememberSessionParent({
sessionID: event.properties.info.id,
parentSessionID: event.properties.info.parentID,
});
}

if (event.type === "session.deleted") {
langfuse.rememberSessionParent({
sessionID: event.properties.info.id,
});
}

if (event.type === "session.error" && event.properties.sessionID) {
langfuse.traceSessionError({
sessionID: event.properties.sessionID,
Expand Down
206 changes: 164 additions & 42 deletions src/langfuse.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,61 @@ export class LangfuseClient {
this.traceState.turnObservationsByMessageId.clear();
this.traceState.latestTurnObservationsBySession.clear();
this.traceState.finalizedToolCallIds.clear();
this.traceState.sessionParentIds.clear();
}

clearSessionTraceState(sessionID: string) {
const sessionMessageIds = new Set<string>();

for (const [messageID, parts] of this.traceState.assistantParts) {
if (
Array.from(parts.values()).some((part) => part.sessionID === sessionID)
) {
sessionMessageIds.add(messageID);
this.traceState.assistantParts.delete(messageID);
}
}

for (const [messageID, step] of this.traceState
.activeGenerationStepsByMessageId) {
if (step.sessionID === sessionID) {
sessionMessageIds.add(messageID);
this.traceState.activeGenerationStepsByMessageId.delete(messageID);
}
}

for (const [messageID, observation] of this.traceState
.turnObservationsByMessageId) {
if (observation.sessionID === sessionID) {
sessionMessageIds.add(messageID);
this.traceState.turnObservationsByMessageId.delete(messageID);
}
}

for (const messageID of sessionMessageIds) {
this.traceState.tracedMessageIds.delete(messageID);
this.traceState.tracedGenerationIds.delete(messageID);
this.traceState.generationSpansByMessageId.delete(messageID);
}

for (const [callID, messageID] of this.traceState.toolMessageIdsByCallId) {
if (sessionMessageIds.has(messageID)) {
this.traceState.toolMessageIdsByCallId.delete(callID);
}
}

for (const reasoningID of this.traceState.tracedReasoningIds) {
if (reasoningID.startsWith(`${sessionID}:`)) {
this.traceState.tracedReasoningIds.delete(reasoningID);
}
}

this.traceState.abortedSessions.delete(sessionID);
this.traceState.activeGenerationSteps.delete(sessionID);
this.traceState.generationParentSpans.delete(sessionID);
this.traceState.generationInputsBySession.delete(sessionID);
this.traceState.toolResultSourceMessageIdsBySession.delete(sessionID);
this.traceState.latestTurnObservationsBySession.delete(sessionID);
}

endActiveToolObservations(sessionID?: string, error?: SessionErrorInfo) {
Expand Down Expand Up @@ -110,15 +165,47 @@ export class LangfuseClient {
}
}

endActiveTurnObservations() {
for (const observation of new Set(
this.traceState.latestTurnObservationsBySession.values(),
)) {
endActiveTurnObservations(sessionID?: string) {
const observations = new Set([
...this.traceState.latestTurnObservationsBySession.values(),
...this.traceState.turnObservationsByMessageId.values(),
]);

for (const observation of observations) {
if (sessionID && observation.sessionID !== sessionID) {
continue;
}

observation.span.end();
}

this.traceState.turnObservationsByMessageId.clear();
this.traceState.latestTurnObservationsBySession.clear();
for (const [messageID, observation] of this.traceState
.turnObservationsByMessageId) {
if (!sessionID || observation.sessionID === sessionID) {
this.traceState.turnObservationsByMessageId.delete(messageID);
}
}

for (const [activeSessionID, observation] of this.traceState
.latestTurnObservationsBySession) {
if (!sessionID || observation.sessionID === sessionID) {
this.traceState.latestTurnObservationsBySession.delete(activeSessionID);
}
}
}

rememberSessionParent(input: {
sessionID: string;
parentSessionID?: string;
}) {
if (input.parentSessionID) {
this.traceState.sessionParentIds.set(
input.sessionID,
input.parentSessionID,
);
} else {
this.traceState.sessionParentIds.delete(input.sessionID);
}
}

traceEvent(input: {
Expand Down Expand Up @@ -461,56 +548,75 @@ export class LangfuseClient {

this.traceState.generationParentSpans.delete(input.sessionID);

const span = this.traceState.tracer.startSpan("opencode.turn", {
attributes: {
"langfuse.observation.type": "agent",
"langfuse.internal.is_app_root": true,
"session.id": input.sessionID,
"langfuse.observation.input": JSON.stringify([formattedMessage]),
"langfuse.observation.metadata": JSON.stringify({
messageID: input.messageID,
agent: input.agent,
providerID: input.model?.providerID,
modelID: input.model?.modelID,
}),
},
});

const observation = {
span,
sessionID: input.sessionID,
messageID: input.messageID,
} satisfies TurnObservation;

if (input.messageID) {
this.traceState.turnObservationsByMessageId.set(
input.messageID,
observation,
);
}

this.traceState.latestTurnObservationsBySession.set(
const parentSessionID = this.traceState.sessionParentIds.get(
input.sessionID,
observation,
);

context.with(trace.setSpan(context.active(), span), () => {
const event = this.traceState.tracer.startSpan("opencode.message.user", {
const parentSpan = this.getSessionParentSpan(input.sessionID);
const startTurn = () => {
const span = this.traceState.tracer.startSpan("opencode.turn", {
attributes: {
"langfuse.observation.type": "event",
"langfuse.observation.type": "agent",
"langfuse.internal.is_app_root": !parentSpan,
"session.id": input.sessionID,
"langfuse.observation.input": JSON.stringify([formattedMessage]),
"langfuse.observation.metadata": JSON.stringify({
messageID: input.messageID,
agent: input.agent,
providerID: input.model?.providerID,
modelID: input.model?.modelID,
parentSessionID,
}),
},
});

event.end();
});
if (parentSpan) {
span.setAttribute("langfuse.internal.is_app_root", false);
}

const observation = {
span,
sessionID: input.sessionID,
messageID: input.messageID,
} satisfies TurnObservation;

if (input.messageID) {
this.traceState.turnObservationsByMessageId.set(
input.messageID,
observation,
);
}

this.traceState.latestTurnObservationsBySession.set(
input.sessionID,
observation,
);

context.with(trace.setSpan(context.active(), span), () => {
const event = this.traceState.tracer.startSpan(
"opencode.message.user",
{
attributes: {
"langfuse.observation.type": "event",
"session.id": input.sessionID,
"langfuse.observation.input": JSON.stringify([formattedMessage]),
"langfuse.observation.metadata": JSON.stringify({
messageID: input.messageID,
agent: input.agent,
providerID: input.model?.providerID,
modelID: input.model?.modelID,
parentSessionID,
}),
},
},
);

event.end();
});
};

parentSpan
? context.with(trace.setSpan(context.active(), parentSpan), startTurn)
: startTurn();
}

rememberAssistantPart(part: MessagePart) {
Expand Down Expand Up @@ -1054,6 +1160,20 @@ export class LangfuseClient {
);
}

private getSessionParentSpan(sessionID: string) {
const parentSessionID = this.traceState.sessionParentIds.get(sessionID);

if (!parentSessionID) {
return undefined;
}

return (
this.traceState.activeGenerationSteps.get(parentSessionID)?.span ??
this.traceState.generationParentSpans.get(parentSessionID) ??
this.traceState.latestTurnObservationsBySession.get(parentSessionID)?.span
);
}

private withObservationParent<T>(
sessionID: string,
fn: () => T,
Expand Down Expand Up @@ -1200,6 +1320,7 @@ export type LangfuseTraceState = {
generationParentSpans: Map<string, ApiSpan>;
generationInputsBySession: Map<string, ChatMlMessage[]>;
toolResultSourceMessageIdsBySession: Map<string, string>;
sessionParentIds: Map<string, string>;
};

export type MessagePart = Extract<
Expand Down Expand Up @@ -1356,6 +1477,7 @@ export const createLangfuseClient = (input: {
generationParentSpans: new Map<string, ApiSpan>(),
generationInputsBySession: new Map<string, ChatMlMessage[]>(),
toolResultSourceMessageIdsBySession: new Map<string, string>(),
sessionParentIds: new Map<string, string>(),
};

const processor = new LangfuseSpanProcessor({
Expand Down
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