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feat(gax): append cred-type header for auth metrics #3186

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merged 14 commits into from
Oct 4, 2024
Merged

feat(gax): append cred-type header for auth metrics #3186

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2dbd2d8
feat: expose credential type as part of x-goog-api-client header.
zhumin8 Sep 3, 2024
ee2624c
test: add test correctly appends cred-type to header.
zhumin8 Sep 10, 2024
fe3ed54
use enum for credential types.
zhumin8 Sep 13, 2024
0cd0ad8
update type.
zhumin8 Oct 1, 2024
b1dd5b0
fix naming and comment.
zhumin8 Oct 2, 2024
781f161
Merge branch 'main' into auth-metrics
zhumin8 Oct 2, 2024
01adbde
Merge branch 'main' into auth-metrics
zhumin8 Oct 3, 2024
32f8934
fix credential is null case.
zhumin8 Oct 3, 2024
51bed23
add test case.
zhumin8 Oct 3, 2024
0424fd2
update test, extract test setup steps.
zhumin8 Oct 3, 2024
0e69f72
Merge branch 'main' into auth-metrics
zhumin8 Oct 4, 2024
b50896a
address feedback: encapsulate credentials metrics logic inside getHea…
zhumin8 Oct 4, 2024
6e60633
address feedback.
zhumin8 Oct 4, 2024
33e24d9
update comment.
zhumin8 Oct 4, 2024
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18 changes: 15 additions & 3 deletions gax-java/gax/src/main/java/com/google/api/gax/rpc/ClientContext.java
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Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,7 @@
import com.google.api.gax.tracing.ApiTracerFactory;
import com.google.api.gax.tracing.BaseApiTracerFactory;
import com.google.auth.ApiKeyCredentials;
import com.google.auth.CredentialTypeForMetrics;
import com.google.auth.Credentials;
import com.google.auth.oauth2.GdchCredentials;
import com.google.auto.value.AutoValue;
Expand Down Expand Up @@ -210,7 +211,12 @@ public static ClientContext create(StubSettings settings) throws IOException {
if (transportChannelProvider.needsExecutor() && settings.getExecutorProvider() != null) {
transportChannelProvider = transportChannelProvider.withExecutor(backgroundExecutor);
}
Map<String, String> headers = getHeadersFromSettings(settings);
CredentialTypeForMetrics credentialTypeForMetrics =
credentials == null
? CredentialTypeForMetrics.DO_NOT_SEND
: credentials.getMetricsCredentialType();
Map<String, String> headers =
getHeadersFromSettingsAndAppendCredentialType(settings, credentialTypeForMetrics);
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if (transportChannelProvider.needsHeaders()) {
transportChannelProvider = transportChannelProvider.withHeaders(headers);
}
Expand Down Expand Up @@ -317,9 +323,10 @@ static GdchCredentials getGdchCredentials(

/**
* Getting a header map from HeaderProvider and InternalHeaderProvider from settings with Quota
* Project Id.
* Project Id. Then append credential type for metrics to x-goog-api-client header.
*/
private static Map<String, String> getHeadersFromSettings(StubSettings settings) {
private static Map<String, String> getHeadersFromSettingsAndAppendCredentialType(
StubSettings settings, CredentialTypeForMetrics credentialTypeForMetrics) {
// Resolve conflicts when merging headers from multiple sources
Map<String, String> userHeaders = settings.getHeaderProvider().getHeaders();
Map<String, String> internalHeaders = settings.getInternalHeaderProvider().getHeaders();
Expand All @@ -346,6 +353,11 @@ private static Map<String, String> getHeadersFromSettings(StubSettings settings)
effectiveHeaders.putAll(userHeaders);
effectiveHeaders.putAll(conflictResolution);

if (credentialTypeForMetrics != CredentialTypeForMetrics.DO_NOT_SEND) {
effectiveHeaders.computeIfPresent(
ApiClientHeaderProvider.getDefaultApiClientHeaderKey(),
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Is it decided to append cred-type/ to x-goog-api-client header? It seems all other header tokens in x-goog-api-client are static values from the client, not from user input. I wonder why we didn't choose to use a separate header key for this purpose?

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@zhumin8 zhumin8 Oct 4, 2024 •
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Is it decided to append cred-type/ to x-goog-api-client header?

yes, this design is already implemented for other some languages. See details in design go/googleapis-auth-metric-design section 2.3.2. I don't think I saw discussion on using a different header specifically though.

It seems all other header tokens in x-goog-api-client are static values from the client, not from user input.

IIUC, this header is eventually sent per request, at that time, I don't see credentials type much different than other client lib info? Do you have specific concerns about this?

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The concern is that x-goog-api-client was constructed in the generated layer only with static values, the name of the header api-client also seems to indicate that the header is supposed to contain only info for the client, not for requests.
In terms of the Java implementations, we now also have multiple places modifying the x-goog-api-client value, in both ClientContext and ApiClientHeaderProvider, which make this header harder to maintain in the future and also more error prone.
That being said, it is probably too late to change the overall design. We just need to be ware of the consequences and add more docs if possible.

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I see your point.
Let me know if you see better suited places for additional docs.

(key, value) -> value + " cred-type/" + credentialTypeForMetrics.getLabel());
}
return ImmutableMap.copyOf(effectiveHeaders);
}

Expand Down
82 changes: 82 additions & 0 deletions gax-java/gax/src/test/java/com/google/api/gax/rpc/ClientContextTest.java
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Expand Up @@ -39,6 +39,7 @@
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

import com.google.api.core.ApiClock;
import com.google.api.gax.core.BackgroundResource;
Expand All @@ -53,6 +54,7 @@
import com.google.api.gax.rpc.testing.FakeStubSettings;
import com.google.api.gax.rpc.testing.FakeTransportChannel;
import com.google.auth.ApiKeyCredentials;
import com.google.auth.CredentialTypeForMetrics;
import com.google.auth.Credentials;
import com.google.auth.oauth2.ComputeEngineCredentials;
import com.google.auth.oauth2.GdchCredentials;
Expand Down Expand Up @@ -677,6 +679,86 @@ void testUserAgentConcat() throws Exception {
.containsEntry("user-agent", "user-supplied-agent internal-agent");
}

@Test
void testApiClientHeaderAppendsCredType() throws Exception {
GoogleCredentials googleCredentials = Mockito.mock(GoogleCredentials.class);
when(googleCredentials.getMetricsCredentialType())
.thenReturn(CredentialTypeForMetrics.USER_CREDENTIALS);

Map<String, String> headers =
setupTestForCredentialTokenUsageMetricsAndGetTransportChannelHeaders(
FixedCredentialsProvider.create(googleCredentials),
FixedHeaderProvider.create("x-goog-api-client", "internal-agent"));

assertThat(headers).containsEntry("x-goog-api-client", "internal-agent cred-type/u");
}

@Test
void testApiClientHeaderDoNotAppendsCredType_whenNoApiClientHeader() throws Exception {
GoogleCredentials googleCredentials = Mockito.mock(GoogleCredentials.class);
when(googleCredentials.getMetricsCredentialType())
.thenReturn(CredentialTypeForMetrics.USER_CREDENTIALS);

Map<String, String> headers =
setupTestForCredentialTokenUsageMetricsAndGetTransportChannelHeaders(
FixedCredentialsProvider.create(googleCredentials),
FixedHeaderProvider.create("some-other-header", "internal-agent"));

assertThat(headers).doesNotContainKey("x-goog-api-client");
assertThat(headers).containsEntry("some-other-header", "internal-agent");
}

@Test
void testApiClientHeaderDoNotAppendsCredType_whenNullCredentials() throws IOException {
Map<String, String> headers =
setupTestForCredentialTokenUsageMetricsAndGetTransportChannelHeaders(
NoCredentialsProvider.create(),
FixedHeaderProvider.create("x-goog-api-client", "internal-agent"));

assertThat(headers).containsKey("x-goog-api-client");
assertThat(headers.get("x-goog-api-client")).doesNotContain("cred-type/");
}

@Test
void testApiClientHeaderDoNotAppendsCredType_whenCredTypeDoNotSend() throws Exception {
GoogleCredentials googleCredentials = Mockito.mock(GoogleCredentials.class);
when(googleCredentials.getMetricsCredentialType())
.thenReturn(CredentialTypeForMetrics.DO_NOT_SEND);

Map<String, String> headers =
setupTestForCredentialTokenUsageMetricsAndGetTransportChannelHeaders(
FixedCredentialsProvider.create(googleCredentials),
FixedHeaderProvider.create("x-goog-api-client", "internal-agent"));

assertThat(headers).containsKey("x-goog-api-client");
assertThat(headers.get("x-goog-api-client")).doesNotContain("cred-type/");
}

private Map<String, String> setupTestForCredentialTokenUsageMetricsAndGetTransportChannelHeaders(
CredentialsProvider credentialsProvider, HeaderProvider headerProvider) throws IOException {
TransportChannelProvider transportChannelProvider =
new FakeTransportProvider(
FakeTransportChannel.create(new FakeChannel()),
null,
true,
null,
null,
DEFAULT_ENDPOINT);

ClientSettings.Builder builder =
new FakeClientSettings.Builder()
.setExecutorProvider(
FixedExecutorProvider.create(Mockito.mock(ScheduledExecutorService.class)))
.setTransportChannelProvider(transportChannelProvider)
.setCredentialsProvider(credentialsProvider)
.setInternalHeaderProvider(headerProvider);

ClientContext clientContext = ClientContext.create(builder.build());
FakeTransportChannel transportChannel =
(FakeTransportChannel) clientContext.getTransportChannel();
return transportChannel.getHeaders();
}

private static String endpoint = "https://foo.googleapis.com";
private static String mtlsEndpoint = "https://foo.mtls.googleapis.com";

Expand Down
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