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feat: Propagating the otel context #1033

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207 changes: 127 additions & 80 deletions core/src/main/java/com/google/adk/flows/llmflows/BaseLlmFlow.java
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138 changes: 66 additions & 72 deletions core/src/main/java/com/google/adk/flows/llmflows/Functions.java
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Original file line number Diff line number Diff line change
Expand Up @@ -42,7 +42,6 @@
import com.google.genai.types.Part;
import io.opentelemetry.api.trace.Span;
import io.opentelemetry.context.Context;
import io.opentelemetry.context.Scope;
import io.reactivex.rxjava3.core.Flowable;
import io.reactivex.rxjava3.core.Maybe;
import io.reactivex.rxjava3.core.Observable;
Expand Down Expand Up @@ -163,7 +162,9 @@ public static Maybe<Event> handleFunctionCalls(
}
return functionResponseEventsObservable
.toList()
.flatMapMaybe(
.toMaybe()
.compose(Tracing.withContext(parentContext))
.flatMap(
events -> {
if (events.isEmpty()) {
return Maybe.empty();
Expand Down Expand Up @@ -226,7 +227,9 @@ public static Maybe<Event> handleFunctionCallsLive(

return responseEventsObservable
.toList()
.flatMapMaybe(
.toMaybe()
.compose(Tracing.withContext(parentContext))
.flatMap(
events -> {
if (events.isEmpty()) {
return Maybe.empty();
Expand All @@ -243,47 +246,45 @@ private static Function<FunctionCall, Maybe<Event>> getFunctionCallMapper(
Context parentContext) {
return functionCall ->
Maybe.defer(
() -> {
try (Scope scope = parentContext.makeCurrent()) {
BaseTool tool = tools.get(functionCall.name().get());
ToolContext toolContext =
ToolContext.builder(invocationContext)
.functionCallId(functionCall.id().orElse(""))
.toolConfirmation(
functionCall.id().map(toolConfirmations::get).orElse(null))
.build();

Map<String, Object> functionArgs =
functionCall.args().map(HashMap::new).orElse(new HashMap<>());

Maybe<Map<String, Object>> maybeFunctionResult =
maybeInvokeBeforeToolCall(invocationContext, tool, functionArgs, toolContext)
.switchIfEmpty(
Maybe.defer(
() -> {
try (Scope innerScope = parentContext.makeCurrent()) {
return isLive
? processFunctionLive(
invocationContext,
tool,
toolContext,
functionCall,
functionArgs,
parentContext)
: callTool(tool, functionArgs, toolContext, parentContext);
}
}));

return postProcessFunctionResult(
maybeFunctionResult,
invocationContext,
tool,
functionArgs,
toolContext,
isLive,
parentContext);
}
});
() -> {
BaseTool tool = tools.get(functionCall.name().get());
ToolContext toolContext =
ToolContext.builder(invocationContext)
.functionCallId(functionCall.id().orElse(""))
.toolConfirmation(
functionCall.id().map(toolConfirmations::get).orElse(null))
.build();

Map<String, Object> functionArgs =
functionCall.args().map(HashMap::new).orElse(new HashMap<>());

Maybe<Map<String, Object>> maybeFunctionResult =
maybeInvokeBeforeToolCall(invocationContext, tool, functionArgs, toolContext)
.switchIfEmpty(
Maybe.defer(
() ->
isLive
? processFunctionLive(
invocationContext,
tool,
toolContext,
functionCall,
functionArgs,
parentContext)
: callTool(
tool, functionArgs, toolContext, parentContext))
.compose(Tracing.withContext(parentContext)));

return postProcessFunctionResult(
maybeFunctionResult,
invocationContext,
tool,
functionArgs,
toolContext,
isLive,
parentContext);
})
.compose(Tracing.withContext(parentContext));
}

/**
Expand Down Expand Up @@ -410,34 +411,27 @@ private static Maybe<Event> postProcessFunctionResult(
})
.flatMapMaybe(
optionalInitialResult -> {
try (Scope scope = parentContext.makeCurrent()) {
Map<String, Object> initialFunctionResult = optionalInitialResult.orElse(null);

return maybeInvokeAfterToolCall(
invocationContext, tool, functionArgs, toolContext, initialFunctionResult)
.map(Optional::of)
.defaultIfEmpty(Optional.ofNullable(initialFunctionResult))
.flatMapMaybe(
finalOptionalResult -> {
Map<String, Object> finalFunctionResult =
finalOptionalResult.orElse(null);
if (tool.longRunning() && finalFunctionResult == null) {
return Maybe.empty();
}
return Maybe.fromCallable(
() ->
buildResponseEvent(
tool,
finalFunctionResult,
toolContext,
invocationContext))
.compose(
Tracing.<Event>trace("tool_response [" + tool.name() + "]")
.setParent(parentContext))
.doOnSuccess(event -> Tracing.traceToolResponse(event.id(), event));
});
}
});
Map<String, Object> initialFunctionResult = optionalInitialResult.orElse(null);

return maybeInvokeAfterToolCall(
invocationContext, tool, functionArgs, toolContext, initialFunctionResult)
.map(Optional::of)
.defaultIfEmpty(Optional.ofNullable(initialFunctionResult))
.flatMapMaybe(
finalOptionalResult -> {
Map<String, Object> finalFunctionResult = finalOptionalResult.orElse(null);
if (tool.longRunning() && finalFunctionResult == null) {
return Maybe.empty();
}
Event event =
buildResponseEvent(
tool, finalFunctionResult, toolContext, invocationContext);
Tracing.traceToolResponse(event.id(), event);
return Maybe.just(event);
});
})
.compose(
Tracing.<Event>trace("tool_response [" + tool.name() + "]").setParent(parentContext));
}

private static Optional<Event> mergeParallelFunctionResponseEvents(
Expand Down
13 changes: 9 additions & 4 deletions core/src/main/java/com/google/adk/flows/llmflows/RequestConfirmationLlmRequestProcessor.java
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,7 @@
import com.google.adk.events.Event;
import com.google.adk.events.ToolConfirmation;
import com.google.adk.models.LlmRequest;
import com.google.adk.telemetry.Tracing;
import com.google.adk.tools.BaseTool;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
Expand All @@ -37,6 +38,7 @@
import com.google.genai.types.FunctionCall;
import com.google.genai.types.FunctionResponse;
import com.google.genai.types.Part;
import io.opentelemetry.context.Context;
import io.reactivex.rxjava3.core.Maybe;
import io.reactivex.rxjava3.core.Single;
import java.util.Collection;
Expand Down Expand Up @@ -216,10 +218,13 @@ private Maybe<Event> assembleEvent(
.build())
.build();

return toolsMapSingle.flatMapMaybe(
toolsMap ->
Functions.handleFunctionCalls(
invocationContext, functionCallEvent, toolsMap, toolConfirmations));
Context parentContext = Context.current();
return toolsMapSingle
.flatMapMaybe(
toolsMap ->
Functions.handleFunctionCalls(
invocationContext, functionCallEvent, toolsMap, toolConfirmations))
.compose(Tracing.withContext(parentContext));
}

private static Optional<Map.Entry<String, ToolConfirmation>> maybeCreateToolConfirmationEntry(
Expand Down
15 changes: 11 additions & 4 deletions core/src/main/java/com/google/adk/plugins/PluginManager.java
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Original file line number Diff line number Diff line change
Expand Up @@ -21,11 +21,13 @@
import com.google.adk.events.Event;
import com.google.adk.models.LlmRequest;
import com.google.adk.models.LlmResponse;
import com.google.adk.telemetry.Tracing;
import com.google.adk.tools.BaseTool;
import com.google.adk.tools.ToolContext;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableList;
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;
Expand Down Expand Up @@ -126,6 +128,7 @@ public Maybe<Content> beforeRunCallback(InvocationContext invocationContext) {

@Override
public Completable afterRunCallback(InvocationContext invocationContext) {
Context capturedContext = Context.current();
return Flowable.fromIterable(plugins)
.concatMapCompletable(
plugin ->
Expand All @@ -136,11 +139,13 @@ public Completable afterRunCallback(InvocationContext invocationContext) {
logger.error(
"[{}] Error during callback 'afterRunCallback'",
plugin.getName(),
e)));
e)))
.compose(Tracing.withContext(capturedContext));
}

@Override
public Completable close() {
Context capturedContext = Context.current();
return Flowable.fromIterable(plugins)
.concatMapCompletableDelayError(
plugin ->
Expand All @@ -149,7 +154,8 @@ public Completable close() {
.doOnError(
e ->
logger.error(
"[{}] Error during callback 'close'", plugin.getName(), e)));
"[{}] Error during callback 'close'", plugin.getName(), e)))
.compose(Tracing.withContext(capturedContext));
}

@Override
Expand Down Expand Up @@ -227,7 +233,7 @@ public Maybe<Map<String, Object>> onToolErrorCallback(
*/
private <T> Maybe<T> runMaybeCallbacks(
Function<Plugin, Maybe<T>> callbackExecutor, String callbackName) {

Context capturedContext = Context.current();
return Flowable.fromIterable(this.plugins)
.concatMapMaybe(
plugin ->
Expand All @@ -247,6 +253,7 @@ private <T> Maybe<T> runMaybeCallbacks(
plugin.getName(),
callbackName,
e)))
.firstElement();
.firstElement()
.compose(Tracing.withContext(capturedContext));
}
}
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