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Parse 128 bit trace Id retuned by lambda extension #7620

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Parse 128 bit trace Id retuned by lambda extension #7620

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agocs Sep 13, 2024
f4c75c7
Use the core tracer's context propagation API
agocs Sep 17, 2024
4f14ced
Remove unused import
agocs Sep 17, 2024
634e8e9
Add test for 128 bit trace IDs
agocs Sep 17, 2024
fea8502
Remove old notifyStartInvocation method
agocs Sep 18, 2024
d17d664
Try a different way of building CoreTracer?
agocs Sep 19, 2024
a78f9a0
toHexString() instead of toString(). Plus tracer builder fixes
randomanderson Sep 20, 2024
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2 changes: 1 addition & 1 deletion dd-trace-core/src/main/java/datadog/trace/core/CoreTracer.java
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Original file line number Diff line number Diff line change
Expand Up @@ -956,7 +956,7 @@ public AgentSpan blackholeSpan() {

@Override
public AgentSpan.Context notifyExtensionStart(Object event) {
return LambdaHandler.notifyStartInvocation(event, propagationTagsFactory);
return LambdaHandler.notifyStartInvocation(this, event);
}

@Override
Expand Down
48 changes: 12 additions & 36 deletions dd-trace-core/src/main/java/datadog/trace/lambda/LambdaHandler.java
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Original file line number Diff line number Diff line change
@@ -1,17 +1,13 @@
package datadog.trace.lambda;

import static datadog.trace.api.TracePropagationStyle.DATADOG;
import static java.util.concurrent.TimeUnit.SECONDS;

import com.squareup.moshi.JsonAdapter;
import com.squareup.moshi.Moshi;
import datadog.trace.api.DDSpanId;
import datadog.trace.api.DDTags;
import datadog.trace.api.DDTraceId;
import datadog.trace.api.sampling.PrioritySampling;
import datadog.trace.bootstrap.instrumentation.api.AgentSpan;
import datadog.trace.core.propagation.ExtractedContext;
import datadog.trace.core.propagation.PropagationTags;
import datadog.trace.core.CoreTracer;
import java.io.ByteArrayInputStream;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
Expand Down Expand Up @@ -44,7 +40,6 @@ public class LambdaHandler {
private static final String DATADOG_INVOCATION_ERROR_MSG = "x-datadog-invocation-error-msg";
private static final String DATADOG_INVOCATION_ERROR_TYPE = "x-datadog-invocation-error-type";
private static final String DATADOG_INVOCATION_ERROR_STACK = "x-datadog-invocation-error-stack";
private static final String DATADOG_TAGS_KEY = "x-datadog-tags";

private static final String START_INVOCATION = "/lambda/start-invocation";
private static final String END_INVOCATION = "/lambda/end-invocation";
Expand Down Expand Up @@ -73,8 +68,7 @@ public class LambdaHandler {

private static String EXTENSION_BASE_URL = "http://127.0.0.1:8124";

public static AgentSpan.Context notifyStartInvocation(
Object event, PropagationTags.Factory propagationTagsFactory) {
public static AgentSpan.Context notifyStartInvocation(CoreTracer tracer, Object event) {
RequestBody body = RequestBody.create(jsonMediaType, writeValueAsString(event));
try (Response response =
HTTP_CLIENT
Expand All @@ -86,33 +80,16 @@ public static AgentSpan.Context notifyStartInvocation(
.build())
.execute()) {
if (response.isSuccessful()) {
final String traceID = response.headers().get(DATADOG_TRACE_ID);
final String priority = response.headers().get(DATADOG_SAMPLING_PRIORITY);
if (null != traceID && null != priority) {
int samplingPriority = PrioritySampling.UNSET;
try {
samplingPriority = Integer.parseInt(priority);
} catch (final NumberFormatException ignored) {
log.warn("could not read the sampling priority, defaulting to UNSET");
}
log.debug(
"notifyStartInvocation success, found traceID = {} and samplingPriority = {}",
traceID,
samplingPriority);
PropagationTags propagationTags =
propagationTagsFactory.fromHeaderValue(
PropagationTags.HeaderType.DATADOG, response.headers().get(DATADOG_TAGS_KEY));
return new ExtractedContext(
DDTraceId.from(traceID),
DDSpanId.ZERO,
samplingPriority,
null,
propagationTags,
DATADOG);
} else {
log.debug(
"could not find traceID or sampling priority in notifyStartInvocation, not injecting the context");
}

return tracer
.propagate()
.extract(
response.headers(),
(carrier, classifier) -> {
for (String headerName : carrier.names()) {
classifier.accept(headerName, carrier.get(headerName));
}
});
}
} catch (Throwable ignored) {
log.error("could not reach the extension");
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Is it expected to show an error to the customer in this case?

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Yes, this means the user is starting a Java Lambda function instrumented with dd-trace-js, but it doesn't have the Lambda Extension, which means it can't send metrics etc. back to Datadog. It should leave an error in the logs so we can diagnose.

Expand All @@ -121,7 +98,6 @@ public static AgentSpan.Context notifyStartInvocation(
}

public static boolean notifyEndInvocation(AgentSpan span, Object result, boolean isError) {

if (null == span || null == span.getSamplingPriority()) {
log.error(
"could not notify the extension as the lambda span is null or no sampling priority has been found");
Expand Down
46 changes: 43 additions & 3 deletions dd-trace-core/src/test/groovy/datadog/trace/lambda/LambdaHandlerTest.groovy
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@ import datadog.trace.api.Config
import datadog.trace.api.DDSpanId
import datadog.trace.api.DDTags
import datadog.trace.api.DDTraceId
import datadog.trace.core.propagation.PropagationTags
import datadog.trace.core.CoreTracer
import datadog.trace.core.test.DDCoreSpecification
import datadog.trace.core.DDSpan
import com.amazonaws.services.lambda.runtime.events.SQSEvent
Expand Down Expand Up @@ -32,6 +32,7 @@ class LambdaHandlerTest extends DDCoreSpecification {
given:
Config config = Mock(Config)
config.getxDatadogTagsMaxLength() >> 512
CoreTracer ct = tracerBuilder().build()

def server = httpServer {
handlers {
Expand All @@ -47,24 +48,62 @@ class LambdaHandlerTest extends DDCoreSpecification {
LambdaHandler.setExtensionBaseUrl(server.address.toString())

when:
def objTest = LambdaHandler.notifyStartInvocation(obj, PropagationTags.factory(config))
def objTest = LambdaHandler.notifyStartInvocation(ct, obj)

then:
objTest.getTraceId().toString() == traceId
objTest.getSamplingPriority() == samplingPriority

cleanup:
server.close()
ct.close()

where:
traceId | samplingPriority | obj
"1234" | 2 | new TestObject()
}

def "test start invocation with 128 bit trace ID"() {
given:
Config config = Mock(Config)
config.getxDatadogTagsMaxLength() >> 512
CoreTracer ct = tracerBuilder().build()

def server = httpServer {
handlers {
post("/lambda/start-invocation") {
response
.status(200)
.addHeader("x-datadog-trace-id", "5744042798732701615")
.addHeader("x-datadog-sampling-priority", "2")
.addHeader("x-datadog-tags", "_dd.p.tid=1914fe7789eb32be")
.send()
}
}
}
LambdaHandler.setExtensionBaseUrl(server.address.toString())

when:
def objTest = LambdaHandler.notifyStartInvocation(ct, obj)

then:
objTest.getTraceId().toHexString() == traceId
objTest.getSamplingPriority() == samplingPriority

cleanup:
server.close()
ct.close()

where:
traceId | samplingPriority | obj
"1914fe7789eb32be4fb6f07e011a6faf" | 2 | new TestObject()
}

def "test start invocation failure"() {
given:
Config config = Mock(Config)
config.getxDatadogTagsMaxLength() >> 512
CoreTracer ct = tracerBuilder().build()

def server = httpServer {
handlers {
Expand All @@ -78,13 +117,14 @@ class LambdaHandlerTest extends DDCoreSpecification {
LambdaHandler.setExtensionBaseUrl(server.address.toString())

when:
def objTest = LambdaHandler.notifyStartInvocation(obj, PropagationTags.factory(config))
def objTest = LambdaHandler.notifyStartInvocation(ct, obj)

then:
objTest == expected

cleanup:
server.close()
ct.close()

where:
expected | obj
Expand Down