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add code snippet for Watch API #137
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| /* | ||
| * Authzed API examples | ||
| */ | ||
| package v1; | ||
|
|
||
| import com.authzed.api.v1.*; | ||
| import com.authzed.grpcutil.BearerToken; | ||
| import io.grpc.ManagedChannel; | ||
| import io.grpc.ManagedChannelBuilder; | ||
| import io.grpc.Status; | ||
| import io.grpc.StatusRuntimeException; | ||
| import java.util.Iterator; | ||
|
|
||
| // Installation | ||
| // https://search.maven.org/artifact/com.authzed.api/authzed | ||
|
|
||
| public class App { | ||
| private static final Logger logger = Logger.getLogger(App.class.getName()); | ||
| private static final String target = "grpc.authzed.com:443"; | ||
| private static final String token = "tc_test_def_token"; | ||
|
|
||
| private final SchemaServiceGrpc.SchemaServiceBlockingStub schemaService; | ||
| private final PermissionsServiceGrpc.PermissionsServiceBlockingStub permissionsService; | ||
|
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| public App(Channel channel) { | ||
| BearerToken bearerToken = new BearerToken(token); | ||
| WatchServiceGrpc.WatchServiceBlockingStub watchClient = WatchServiceGrpc | ||
| .newBlockingStub(channel) | ||
| .withCallCredentials(bearerToken); | ||
| } | ||
|
|
||
| public static void main(String[] args) { | ||
| ManagedChannel channel = ManagedChannelBuilder | ||
| .forTarget(target) | ||
| .useTransportSecurity() // if not using TLS, replace with .usePlaintext() | ||
| .build(); | ||
|
|
||
| ZedToken lastZedToken = ZedToken.newBuilder().setToken("").build(); | ||
|
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| while(true) { | ||
| try { | ||
| WatchRequest.Builder builder = WatchRequest.newBuilder() | ||
| .addOptionalUpdateKinds(com.authzed.api.v1.WatchKind.WATCH_KIND_INCLUDE_CHECKPOINTS); | ||
|
|
||
| if (!lastZedToken.getToken().isEmpty()) { | ||
| System.out.println("Resuming watch from token: " + lastZedToken.getToken()); | ||
| builder.setOptionalStartCursor(lastZedToken); | ||
| } | ||
|
|
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| WatchRequest request = builder.build(); | ||
|
|
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| Iterator<WatchResponse> watchStream = watchClient.watch(request); | ||
|
|
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| while (watchStream.hasNext()) { | ||
| WatchResponse msg = watchStream.next(); | ||
|
|
||
| if (msg.getUpdatesCount() > 0) { | ||
| for (var update : msg.getUpdatesList()) { | ||
| System.out.println("Received update: " + update); | ||
| } | ||
| } else { | ||
| System.out.println("No changes made in SpiceDB"); | ||
| } | ||
|
|
||
| if (!msg.getChangesThrough().getToken().isEmpty()) { | ||
| lastZedToken = msg.getChangesThrough(); | ||
| } | ||
| } | ||
|
|
||
| } catch (Exception e) { | ||
| if (e instanceof StatusRuntimeException sre && (sre.getStatus().getCode().equals(Status.UNAVAILABLE.getCode()) || | ||
| (sre.getStatus().getCode().equals(Status.INTERNAL.getCode())) && sre.getMessage().contains("stream timeout"))) { | ||
| // Probably a server restart. Retry. | ||
| } else { | ||
| System.out.println("Error calling watch: " + e.getMessage()); | ||
| return; | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
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IMO we should just do this on the
Internalcode aloneThere was a problem hiding this comment.
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shouldn't we also retry on
Unavailable?