Client and server use test.proto and the gRPC over HTTP/2 v2 protocol.
Clients implement test cases that test certain functionally. Each client is provided the test case it is expected to run as a command-line parameter. Names should be lowercase and without spaces.
Clients should accept these arguments:
Clients must support TLS with ALPN. Clients must not disable certificate checking.
This test verifies that implementations support zero-size messages. Ideally, client implementations would verify that the request and response were zero bytes serialized, but this is generally prohibitive to perform, so is not required.
Server features:
Procedure:
Client asserts:
It may be possible to use UnaryCall instead of EmptyCall, but it is harder to ensure that the proto serialized to zero bytes.
This test verifies that gRPC requests marked as cacheable use GET verb instead of POST, and that server sets appropriate cache control headers for the response to be cached by a proxy. This test requires that the server is behind a caching proxy. Use of current timestamp in the request prevents accidental cache matches left over from previous tests.
Server features:
Procedure:
SimpleRequest request with payload set to current timestamp. Timestamp format is irrelevant, and resolution is in nanoseconds. Client adds a x-user-ip header with value 1.2.3.4 to the request. This is done since some proxys such as GFE will not cache requests from localhost. Client marks the request as cacheable by setting the cacheable flag in the request context. Longer term this should be driven by the method option specified in the proto file itself.Client asserts:
This test verifies unary calls succeed in sending messages, and touches on flow control (even if compression is enabled on the channel).
Server features:
Procedure:
Client calls UnaryCall with:
{
response_size: 314159
payload:{
body: 271828 bytes of zeros
}
}
Client asserts:
This test verifies the client can compress unary messages by sending two unary calls, for compressed and uncompressed payloads. It also sends an initial probing request to verify whether the server supports the CompressedRequest feature by checking if the probing call fails with an INVALID_ARGUMENT status.
Server features:
Procedure:
Client calls UnaryCall with the feature probe, an uncompressed message:
{
expect_compressed:{
value: true
}
response_size: 314159
payload:{
body: 271828 bytes of zeros
}
}
Client calls UnaryCall with the compressed message:
{
expect_compressed:{
value: true
}
response_size: 314159
payload:{
body: 271828 bytes of zeros
}
}
Client calls UnaryCall with the uncompressed message:
{
expect_compressed:{
value: false
}
response_size: 314159
payload:{
body: 271828 bytes of zeros
}
}
Client asserts:
INVALID_ARGUMENT status.This test verifies the server can compress unary messages. It sends two unary requests, expecting the server's response to be compressed or not according to the response_compressed boolean.
Whether compression was actually performed is determined by the compression bit in the response's message flags. Note that some languages may not have access to the message flags, in which case the client will be unable to verify that the response_compressed boolean is obeyed by the server.
Server features:
Procedure:
Client calls UnaryCall with SimpleRequest:
{
response_compressed:{
value: true
}
response_size: 314159
payload:{
body: 271828 bytes of zeros
}
}
{
response_compressed:{
value: false
}
response_size: 314159
payload:{
body: 271828 bytes of zeros
}
}
Client asserts:
response_compressed is true, the response MUST have the compressed message flag set.response_compressed is false, the response MUST NOT have the compressed message flag set.This test verifies that client-only streaming succeeds.
Server features:
Procedure:
Client calls StreamingInputCall
Client sends:
{
payload:{
body: 27182 bytes of zeros
}
}
Client then sends:
{
payload:{
body: 8 bytes of zeros
}
}
Client then sends:
{
payload:{
body: 1828 bytes of zeros
}
}
Client then sends:
{
payload:{
body: 45904 bytes of zeros
}
}
Client half-closes
Client asserts:
This test verifies the client can compress requests on per-message basis by performing a two-request streaming call. It also sends an initial probing request to verify whether the server supports the CompressedRequest feature by checking if the probing call fails with an INVALID_ARGUMENT status.
Procedure:
Client calls StreamingInputCall and sends the following feature-probing uncompressed StreamingInputCallRequest message
{
expect_compressed:{
value: true
}
payload:{
body: 27182 bytes of zeros
}
}
If the call does not fail with INVALID_ARGUMENT, the test fails. Otherwise, we continue.
Client calls StreamingInputCall again, sending the compressed message
{
expect_compressed:{
value: true
}
payload:{
body: 27182 bytes of zeros
}
}
And finally, the uncompressed message
{
expect_compressed:{
value: false
}
payload:{
body: 45904 bytes of zeros
}
}
Client half-closes
Client asserts:
INVALID_ARGUMENT.This test verifies that server-only streaming succeeds.
Server features:
Procedure:
Client calls StreamingOutputCall with StreamingOutputCallRequest:
{
response_parameters:{
size: 31415
}
response_parameters:{
size: 9
}
response_parameters:{
size: 2653
}
response_parameters:{
size: 58979
}
}
Client asserts:
This test verifies that the server can compress streaming messages and disable compression on individual messages, expecting the server's response to be compressed or not according to the response_compressed boolean.
Whether compression was actually performed is determined by the compression bit in the response's message flags. Note that some languages may not have access to the message flags, in which case the client will be unable to verify that the response_compressed boolean is obeyed by the server.
Server features:
Procedure:
Client calls StreamingOutputCall with StreamingOutputCallRequest:
{
response_parameters:{
compressed: {
value: true
}
size: 31415
}
response_parameters:{
compressed: {
value: false
}
size: 92653
}
}
Client asserts:
response_compressed is false, the response's messages MUST NOT have the compressed message flag set.response_compressed is true, the response's messages MUST have the compressed message flag set.This test verifies that full duplex bidi is supported.
Server features:
Procedure:
Client calls FullDuplexCall with:
{
response_parameters:{
size: 31415
}
payload:{
body: 27182 bytes of zeros
}
}
After getting a reply, it sends:
{
response_parameters:{
size: 9
}
payload:{
body: 8 bytes of zeros
}
}
After getting a reply, it sends:
{
response_parameters:{
size: 2653
}
payload:{
body: 1828 bytes of zeros
}
}
After getting a reply, it sends:
{
response_parameters:{
size: 58979
}
payload:{
body: 45904 bytes of zeros
}
}
After getting a reply, client half-closes
Client asserts:
This test verifies that streams support having zero-messages in both directions.
Server features:
Procedure:
Client asserts:
This test is only for cloud-to-prod path.
This test verifies unary calls succeed in sending messages while using Service Credentials from GCE metadata server. The client instance needs to be created with desired oauth scope.
The test uses --default_service_account with GCE service account email and --oauth_scope with the OAuth scope to use. For testing against grpc-test.sandbox.googleapis.com, “https://www.googleapis.com/auth/xapi.zoo” should be passed in as --oauth_scope.
Server features:
Procedure:
Client configures channel to use GCECredentials
Client calls UnaryCall on the channel with:
{
response_size: 314159
payload:{
body: 271828 bytes of zeros
}
fill_username: true
fill_oauth_scope: true
}
Client asserts:
--default_service_account flag--oauth_scopeThis test is only for cloud-to-prod path.
This test verifies unary calls succeed in sending messages while using JWT token (created by the project's key file)
Test caller should set flag --service_account_key_file with the path to json key file downloaded from https://console.developers.google.com. Alternately, if using a usable auth implementation, she may specify the file location in the environment variable GOOGLE_APPLICATION_CREDENTIALS.
Server features:
Procedure:
Client configures the channel to use JWTTokenCredentials
Client calls UnaryCall with:
{
response_size: 314159
payload:{
body: 271828 bytes of zeros
}
fill_username: true
}
Client asserts:
--default_service_account flag.This test is only for cloud-to-prod path and some implementations may run in GCE only.
This test verifies unary calls succeed in sending messages using an OAuth2 token that is obtained out of band. For the purpose of the test, the OAuth2 token is actually obtained from a service account credentials or GCE credentials via the language-specific authorization library.
The difference between this test and the other auth tests is that it first uses the authorization library to obtain an authorization token.
The test
--service_account_key_file with the path to a json key file downloaded from https://console.developers.google.com. Alternately, if using a usable auth implementation, it may specify the file location in the environment variable GOOGLE_APPLICATION_CREDENTIALS, OR if GCE credentials is used to fetch the token, --default_service_account can be used to pass in GCE service account email.--oauth_scope for the oauth scope. For testing against grpc-test.sandbox.googleapis.com, “https://www.googleapis.com/auth/xapi.zoo” should be passed as the --oauth_scope.Server features:
Procedure:
Client uses the auth library to obtain an authorization token
Client configures the channel to use AccessTokenCredentials with the access token obtained in step 1
Client calls UnaryCall with the following message
{
fill_username: true
fill_oauth_scope: true
}
Client asserts:
--oauth_scopeSimilar to the other auth tests, this test is only for cloud-to-prod path.
This test verifies unary calls succeed in sending messages using a JWT or a service account credentials set on the RPC.
The test
--service_account_key_file with the path to a json key file downloaded from https://console.developers.google.com. Alternately, if using a usable auth implementation, it may specify the file location in the environment variable GOOGLE_APPLICATION_CREDENTIALS--oauth_scope for the oauth scope if implementer wishes to use service account credential instead of JWT credential. For testing against grpc-test.sandbox.googleapis.com, oauth scope “https://www.googleapis.com/auth/xapi.zoo” should be used.Server features:
Procedure:
Client configures the channel with just SSL credentials
Client calls UnaryCall, setting per-call credentials to JWTTokenCredentials. The request is the following message
{
fill_username: true
}
Client asserts:
Similar to the other auth tests, this test should only be run against prod servers. Different from some of the other auth tests however, this test may be also run from outside of GCP.
This test verifies unary calls succeed when the client uses GoogleDefaultCredentials. The path to a service account key file in the GOOGLE_APPLICATION_CREDENTIALS environment variable may or may not be provided by the test runner. For example, the test runner might set this environment when outside of GCP but keep it unset when on GCP.
The test uses --default_service_account with GCE service account email.
Server features:
Procedure:
Client configures the channel to use GoogleDefaultCredentials
GoogleDefaultCredentials within the context of this test description refers to an API which encapsulates both “transport credentials” and “call credentials” and which is capable of transport creds auto-selection (including ALTS). Similar APIs involving only auto-selection of OAuth mechanisms might work for this test but aren't the intended subjects.Client calls UnaryCall with:
{
fill_username: true
}
Client asserts:
--default_service_accountSimilar to the other auth tests, this test should only be run against prod servers. Note that this test may only be ran on GCP.
This test verifies unary calls succeed when the client uses ComputeEngineChannelCredentials. All that is needed by the test environment is for the client to be running on GCP.
The test uses --default_service_account with GCE service account email. This email must identify the default service account of the GCP VM that the test is running on.
Server features:
Procedure:
Client configures the channel to use ComputeEngineChannelCredentials
ComputeEngineChannelCredentials within the context of this test description refers to an API which encapsulates both “transport credentials” and “call credentials” and which is capable of transport creds auto-selection (including ALTS). The exact name of the API may vary per language.Client calls UnaryCall with:
{
fill_username: true
}
Client asserts:
--default_service_accountThis test verifies that custom metadata in either binary or ascii format can be sent as initial-metadata by the client and as both initial- and trailing-metadata by the server.
Server features:
Procedure:
The client attaches custom metadata with the following keys and values:
key: "x-grpc-test-echo-initial", value: "test_initial_metadata_value" key: "x-grpc-test-echo-trailing-bin", value: 0xababab
to a UnaryCall with request:
{
response_size: 314159
payload:{
body: 271828 bytes of zeros
}
}
The client attaches custom metadata with the following keys and values:
key: "x-grpc-test-echo-initial", value: "test_initial_metadata_value" key: "x-grpc-test-echo-trailing-bin", value: 0xababab
to a FullDuplexCall with request:
{
response_parameters:{
size: 314159
}
payload:{
body: 271828 bytes of zeros
}
}
and then half-closes
Client asserts:
"x-grpc-test-echo-initial" and value "test_initial_metadata_value"is received in the initial metadata for calls in Procedure steps 1 and 2."x-grpc-test-echo-trailing-bin" and value 0xababab is received in the trailing metadata for calls in Procedure steps 1 and 2.This test verifies unary calls succeed in sending messages, and propagate back status code and message sent along with the messages.
Server features:
Procedure:
Client calls UnaryCall with:
{
response_status:{
code: 2
message: "test status message"
}
}
Client calls FullDuplexCall with:
{
response_status:{
code: 2
message: "test status message"
}
}
and then half-closes
Client asserts:
This test verifies Unicode and whitespace is correctly processed in status message. “\t” is horizontal tab. “\r” is carriage return. “\n” is line feed.
Server features:
Procedure:
Client calls UnaryCall with:
{
response_status:{
code: 2
message: "\t\ntest with whitespace\r\nand Unicode BMP ☺ and non-BMP 😈\t\n"
}
}
Client asserts:
This test verifies that calling an unimplemented RPC method returns the UNIMPLEMENTED status code.
Server features: N/A
Procedure:
Client calls grpc.testing.TestService/UnimplementedCall with an empty request (defined as grpc.testing.Empty):
{
}
Client asserts:
This test verifies calling an unimplemented server returns the UNIMPLEMENTED status code.
Server features: N/A
Procedure:
grpc.testing.UnimplementedService/UnimplementedCall with an empty request (defined as grpc.testing.Empty)Client asserts:
This test verifies that a request can be cancelled after metadata has been sent but before payloads are sent.
Server features:
Procedure:
Client asserts:
This test verifies that a request can be cancelled after receiving a message from the server.
Server features:
Procedure:
Client starts FullDuplexCall with
{
response_parameters:{
size: 31415
}
payload:{
body: 27182 bytes of zeros
}
}
After receiving a response, client cancels request
Client asserts:
This test verifies that an RPC request whose lifetime exceeds its configured timeout value will end with the DeadlineExceeded status.
Server features:
Procedure:
Client calls FullDuplexCall with the following request and sets its timeout to 1ms
{
payload:{
body: 27182 bytes of zeros
}
}
Client waits
Client asserts:
Status: TODO
Client performs 1000 large_unary tests in parallel on the same channel.
Status: TODO
This test verifies that a client sending faster than a server can drain sees pushback (i.e., attempts to send succeed only after appropriate delays).
These tests are not yet standardized, and are not yet implemented in all languages. Therefore they are not part of our interop matrix.
The client performs many large_unary RPCs in sequence over the same channel. The number of RPCs is configured by the experimental flag, soak_iterations.
The client performs many large_unary RPCs in sequence. Before each RPC, it tears down and rebuilds the channel. The number of RPCs is configured by the experimental flag, soak_iterations.
This tests puts stress on several gRPC components; the resolver, the load balancer, and the RPC hotpath.
The client performs a number of large_unary RPCs over a single long-lived channel with a fixed but configurable interval between each RPC.
Propagation of status code and message (yangg)
Multiple thousand simultaneous calls on same Channel (ctiller)
Metadata: client headers, server headers + trailers, binary+ascii
Cancel before start (ctiller)
Cancel after sent first message (ctiller)
Cancel after received headers (ctiller)
Timeout but completed before expire (zhaoq)
Multiple thousand simultaneous calls timeout on same Channel (ctiller)
Flow control. Pushback at client for large messages (abhishek)
Flow control. Pushback at server for large messages (abhishek)
Going over max concurrent streams doesn't fail (client controls itself) (abhishek)
RPC method not implemented (yangg)
Multiple thousand simultaneous calls on different Channels (ctiller)
Failed TLS hostname verification (ejona?)
Large amount of headers to cause CONTINUATIONs; 63K of ‘X’s, all in one header.
Start streaming RPC but don't send any requests, server responds
Resilience to buggy servers: These tests would verify that a client application isn‘t affected negatively by the responses put on the wire by a buggy server (e.g. the client library won’t make the application crash).
Reconnect after transport failure
Reconnect backoff
Fuzz testing
Servers implement various named features for clients to test with. Server features are orthogonal. If a server implements a feature, it is always available for clients. Names are simple descriptions for developer communication and tracking.
Servers should accept these arguments:
--port=PORT
--use_tls=BOOLEAN
Servers must support TLS with ALPN. They should use server1.pem for their certificate.
Server implements EmptyCall which immediately returns the empty message.
Server implements UnaryCall which immediately returns a SimpleResponse with a payload body of size SimpleRequest.response_size bytes and type as appropriate for the SimpleRequest.response_type. If the server does not support the response_type, then it should fail the RPC with INVALID_ARGUMENT.
Server gets the default SimpleRequest proto as the request. The content of the request is ignored. It returns the SimpleResponse proto with the payload set to current timestamp. The timestamp is an integer representing current time with nanosecond resolution. This integer is formated as ASCII decimal in the response. The format is not really important as long as the response payload is different for each request. In addition it adds
When the client sets response_compressed to true, the server's response is sent back compressed. Note that response_compressed is present on both SimpleRequest (unary) and StreamingOutputCallRequest (streaming).
When the client sets expect_compressed to true, the server expects the client request to be compressed. If it's not, it fails the RPC with INVALID_ARGUMENT. Note that response_compressed is present on both SimpleRequest (unary) and StreamingOutputCallRequest (streaming).
Server implements StreamingInputCall which upon half close immediately returns a StreamingInputCallResponse where aggregated_payload_size is the sum of all request payload bodies received.
Server implements StreamingOutputCall by replying, in order, with one StreamingOutputCallResponse for each ResponseParameters in StreamingOutputCallRequest. Each StreamingOutputCallResponse should have a payload body of size ResponseParameters.size bytes, as specified by its respective ResponseParameters. After sending all responses, it closes with OK.
Server implements FullDuplexCall by replying, in order, with one StreamingOutputCallResponse for each ResponseParameters in each StreamingOutputCallRequest. Each StreamingOutputCallResponse should have a payload body of size ResponseParameters.size bytes, as specified by its respective ResponseParameters. After receiving half close and sending all responses, it closes with OK.
When the client sends a response_status in the request payload, the server closes the stream with the status code and messsage contained within said response_status. The server will not process any further messages on the stream sent by the client. This can be used by clients to verify correct handling of different status codes and associated status messages end-to-end.
When the client sends metadata with the key "x-grpc-test-echo-initial" with its request, the server sends back exactly this key and the corresponding value back to the client as part of initial metadata. When the client sends metadata with the key "x-grpc-test-echo-trailing-bin" with its request, the server sends back exactly this key and the corresponding value back to the client as trailing metadata.
In StreamingOutputCall and FullDuplexCall, server delays sending a StreamingOutputCallResponse by the ResponseParameters's interval_us for that particular response, relative to the last response sent. That is, interval_us acts like a sleep before sending the response and accumulates from one response to the next.
Interaction with flow control is unspecified.
Status: Pending
If a SimpleRequest has fill_username=true and that request was successfully authenticated, then the SimpleResponse should have username filled with the canonical form of the authenticated source. The canonical form is dependent on the authentication method, but is likely to be a base 10 integer identifier or an email address.
If a SimpleRequest has fill_oauth_scope=true and that request was successfully authenticated via OAuth, then the SimpleResponse should have oauth_scope filled with the scope of the method being invoked.
Although a general server-side feature, most test servers won't implement this feature. The TLS server grpc-test.sandbox.googleapis.com:443 supports this feature. It requires at least the OAuth scope https://www.googleapis.com/auth/xapi.zoo for authentication to succeed.
Discussion:
Ideally, this would be communicated via metadata and not in the request/response, but we want to use this test in code paths that don't yet fully communicate metadata.