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feat: Fixing the spans produced by agent calls to have the right parent spans #993

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Merged
copybara-service merged 1 commit into from
Mar 10, 2026
Merged

feat: Fixing the spans produced by agent calls to have the right parent spans #993

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107 changes: 50 additions & 57 deletions core/src/main/java/com/google/adk/agents/BaseAgent.java
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Original file line number Diff line number Diff line change
Expand Up @@ -29,10 +29,10 @@
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import com.google.errorprone.annotations.DoNotCall;
import com.google.genai.types.Content;
import io.opentelemetry.context.Context;
import io.reactivex.rxjava3.core.Completable;
import io.reactivex.rxjava3.core.Flowable;
import io.reactivex.rxjava3.core.Maybe;
import io.reactivex.rxjava3.core.Single;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
Expand Down Expand Up @@ -312,47 +312,38 @@ public Flowable<Event> runAsync(InvocationContext parentContext) {
private Flowable<Event> run(
InvocationContext parentContext,
Function<InvocationContext, Flowable<Event>> runImplementation) {
Context otelParentContext = Context.current();
InvocationContext invocationContext = createInvocationContext(parentContext);

return Flowable.defer(
() -> {
return callCallback(
beforeCallbacksToFunctions(
invocationContext.pluginManager(), beforeAgentCallback),
invocationContext)
.flatMapPublisher(
beforeEvent -> {
if (invocationContext.endInvocation()) {
return Flowable.just(beforeEvent);
}

return Flowable.just(beforeEvent)
.concatWith(runMainAndAfter(invocationContext, runImplementation));
})
.switchIfEmpty(
Flowable.defer(() -> runMainAndAfter(invocationContext, runImplementation)));
})
.compose(
Tracing.traceAgent(
otelParentContext,
"invoke_agent " + name(),
name(),
description(),
invocationContext));
}

private Flowable<Event> runMainAndAfter(
InvocationContext invocationContext,
Function<InvocationContext, Flowable<Event>> runImplementation) {
Flowable<Event> mainEvents = runImplementation.apply(invocationContext);
Flowable<Event> afterEvents =
callCallback(
afterCallbacksToFunctions(invocationContext.pluginManager(), afterAgentCallback),
invocationContext)
.flatMapPublisher(Flowable::just);

return Flowable.concat(mainEvents, afterEvents);
() -> {
InvocationContext invocationContext = createInvocationContext(parentContext);

return callCallback(
beforeCallbacksToFunctions(
invocationContext.pluginManager(), beforeAgentCallback),
invocationContext)
.flatMapPublisher(
beforeEventOpt -> {
if (invocationContext.endInvocation()) {
return Flowable.fromOptional(beforeEventOpt);
}

Flowable<Event> beforeEvents = Flowable.fromOptional(beforeEventOpt);
Flowable<Event> mainEvents =
Flowable.defer(() -> runImplementation.apply(invocationContext));
Flowable<Event> afterEvents =
Flowable.defer(
() ->
callCallback(
afterCallbacksToFunctions(
invocationContext.pluginManager(), afterAgentCallback),
invocationContext)
.flatMapPublisher(Flowable::fromOptional));

return Flowable.concat(beforeEvents, mainEvents, afterEvents);
})
.compose(
Tracing.traceAgent(
"invoke_agent " + name(), name(), description(), invocationContext));
});
}

/**
Expand Down Expand Up @@ -392,13 +383,13 @@ private <T> ImmutableList<Function<CallbackContext, Maybe<Content>>> callbacksTo
*
* @param agentCallbacks Callback functions.
* @param invocationContext Current invocation context.
* @return Maybe emitting first event, or empty if none.
* @return single emitting first event, or empty if none.
*/
private Maybe<Event> callCallback(
private Single<Optional<Event>> callCallback(
List<Function<CallbackContext, Maybe<Content>>> agentCallbacks,
InvocationContext invocationContext) {
if (agentCallbacks.isEmpty()) {
return Maybe.empty();
return Single.just(Optional.empty());
}

CallbackContext callbackContext =
Expand All @@ -407,25 +398,27 @@ private Maybe<Event> callCallback(
return Flowable.fromIterable(agentCallbacks)
.concatMap(
callback -> {
return callback
.apply(callbackContext)
Maybe<Content> maybeContent = callback.apply(callbackContext);

return maybeContent
.map(
content -> {
invocationContext.setEndInvocation(true);
return Event.builder()
.id(Event.generateEventId())
.invocationId(invocationContext.invocationId())
.author(name())
.branch(invocationContext.branch().orElse(null))
.actions(callbackContext.eventActions())
.content(content)
.build();
return Optional.of(
Event.builder()
.id(Event.generateEventId())
.invocationId(invocationContext.invocationId())
.author(name())
.branch(invocationContext.branch().orElse(null))
.actions(callbackContext.eventActions())
.content(content)
.build());
})
.toFlowable();
})
.firstElement()
.switchIfEmpty(
Maybe.defer(
Single.defer(
() -> {
if (callbackContext.state().hasDelta()) {
Event.Builder eventBuilder =
Expand All @@ -436,9 +429,9 @@ private Maybe<Event> callCallback(
.branch(invocationContext.branch().orElse(null))
.actions(callbackContext.eventActions());

return Maybe.just(eventBuilder.build());
return Single.just(Optional.of(eventBuilder.build()));
} else {
return Maybe.empty();
return Single.just(Optional.empty());
}
}));
}
Expand Down
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