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Parse 128 bit trace Id retuned by lambda extension #7620

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merged 10 commits into from
Sep 27, 2024
+54 −45
Merged

Parse 128 bit trace Id retuned by lambda extension #7620

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7cb5150
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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
87e7f1d
Get rid of Mock Config, since I think it's not necessary here
agocs Sep 23, 2024
8b62d0b
Merge branch 'master' into chris.agocs/parse_128_bit_trace_id_from_la…
agocs Sep 25, 2024
0ba15ad
Merge branch 'master' into chris.agocs/parse_128_bit_trace_id_from_la…
agocs Sep 26, 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
73 changes: 62 additions & 11 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
Expand Up @@ -10,6 +10,7 @@
import datadog.trace.api.DDTraceId;
import datadog.trace.api.sampling.PrioritySampling;
import datadog.trace.bootstrap.instrumentation.api.AgentSpan;
import datadog.trace.core.CoreTracer;
import datadog.trace.core.propagation.ExtractedContext;
import datadog.trace.core.propagation.PropagationTags;
import java.io.ByteArrayInputStream;
Expand Down Expand Up @@ -45,6 +46,7 @@ public class LambdaHandler {
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 DATADOG_UPPER_64_TRACE_ID_TAG_KEY = "_dd.p.tid";

private static final String START_INVOCATION = "/lambda/start-invocation";
private static final String END_INVOCATION = "/lambda/end-invocation";
Expand Down Expand Up @@ -73,6 +75,35 @@ public class LambdaHandler {

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

public static AgentSpan.Context notifyStartInvocation(CoreTracer tracer, Object event) {
RequestBody body = RequestBody.create(jsonMediaType, writeValueAsString(event));
try (Response response =
HTTP_CLIENT
.newCall(
new Request.Builder()
.url(EXTENSION_BASE_URL + START_INVOCATION)
.addHeader(DATADOG_META_LANG, "java")
.post(body)
.build())
.execute()) {
if (response.isSuccessful()) {

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.

}
return null;
}

public static AgentSpan.Context notifyStartInvocation(
Object event, PropagationTags.Factory propagationTagsFactory) {
RequestBody body = RequestBody.create(jsonMediaType, writeValueAsString(event));
Expand All @@ -86,9 +117,20 @@ public static AgentSpan.Context notifyStartInvocation(
.build())
.execute()) {
if (response.isSuccessful()) {
final String traceID = response.headers().get(DATADOG_TRACE_ID);
final String traceIDLower64Long = response.headers().get(DATADOG_TRACE_ID);
final String priority = response.headers().get(DATADOG_SAMPLING_PRIORITY);
if (null != traceID && null != priority) {
final String tags = response.headers().get(DATADOG_TAGS_KEY);
final String traceIDUpper64BitHex = findUpper64BitTraceId(tags);
DDTraceId traceId;
if (null != traceIDUpper64BitHex && null != traceIDLower64Long) {
long lower64Long = Long.parseUnsignedLong(traceIDLower64Long);
String lower64Hex = Long.toHexString(lower64Long);
String full128BitHex = traceIDUpper64BitHex + lower64Hex;
traceId = DDTraceId.fromHex(full128BitHex);
} else {
traceId = DDTraceId.from(traceIDLower64Long);
}
if (null != traceIDLower64Long && null != priority) {
int samplingPriority = PrioritySampling.UNSET;
try {
samplingPriority = Integer.parseInt(priority);
Expand All @@ -97,18 +139,12 @@ public static AgentSpan.Context notifyStartInvocation(
}
log.debug(
"notifyStartInvocation success, found traceID = {} and samplingPriority = {}",
traceID,
traceIDLower64Long,
samplingPriority);
PropagationTags propagationTags =
propagationTagsFactory.fromHeaderValue(
PropagationTags.HeaderType.DATADOG, response.headers().get(DATADOG_TAGS_KEY));
propagationTagsFactory.fromHeaderValue(PropagationTags.HeaderType.DATADOG, tags);
return new ExtractedContext(
DDTraceId.from(traceID),
DDSpanId.ZERO,
samplingPriority,
null,
propagationTags,
DATADOG);
traceId, DDSpanId.ZERO, samplingPriority, null, propagationTags, DATADOG);
} else {
log.debug(
"could not find traceID or sampling priority in notifyStartInvocation, not injecting the context");
Expand All @@ -120,6 +156,21 @@ public static AgentSpan.Context notifyStartInvocation(
return null;
}

private static String findUpper64BitTraceId(String tags)
throws NumberFormatException, IndexOutOfBoundsException {
if (tags == null) {
return null;
}
String[] tagPairs = tags.split(",");
for (String tagPair : tagPairs) {
String[] tag = tagPair.trim().split("=");
if (tag.length == 2 && tag[0].equals(DATADOG_UPPER_64_TRACE_ID_TAG_KEY)) {
return tag[1];
}
}
return null;
}

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

if (null == span || null == span.getSamplingPriority()) {
Expand Down
43 changes: 40 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 = CoreTracer.builder().config(config).build()

def server = httpServer {
handlers {
Expand All @@ -47,7 +48,7 @@ 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
Expand All @@ -61,10 +62,46 @@ class LambdaHandlerTest extends DDCoreSpecification {
"1234" | 2 | new TestObject()
}

def "test start invocation with 128 bit trace ID"() {
given:
Config config = Mock(Config)
config.getxDatadogTagsMaxLength() >> 512
CoreTracer ct = CoreTracer.builder().config(config).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().toString() == traceId
objTest.getSamplingPriority() == samplingPriority

cleanup:
server.close()

where:
traceId | samplingPriority | obj
"33339707034668043638992915224308903855" | 2 | new TestObject()
}

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

def server = httpServer {
handlers {
Expand All @@ -78,7 +115,7 @@ 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
Expand Down
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