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docs: Show macaroon usage with Java GRPC example.

This commit is contained in:
Brenden Matthews 2018-02-28 16:11:06 -05:00
parent f7ec490f44
commit eed0e9ac67
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docs/grpc/java.md
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@ -62,6 +62,11 @@ The following dependencies are required.
<artifactId>netty-tcnative-boringssl-static</artifactId> <artifactId>netty-tcnative-boringssl-static</artifactId>
<version>2.0.7.Final</version> <version>2.0.7.Final</version>
</dependency> </dependency>
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>1.11</version>
</dependency>
</dependencies> </dependencies>
``` ```
In the build section, we'll need to configure the following things : In the build section, we'll need to configure the following things :
@ -98,28 +103,79 @@ In the build section, we'll need to configure the following things :
``` ```
#### Main.java #### Main.java
```java ```java
import io.grpc.Attributes;
import io.grpc.CallCredentials;
import io.grpc.ManagedChannel; import io.grpc.ManagedChannel;
import io.grpc.Metadata;
import io.grpc.MethodDescriptor;
import io.grpc.Status;
import io.grpc.netty.GrpcSslContexts; import io.grpc.netty.GrpcSslContexts;
import io.grpc.netty.NettyChannelBuilder; import io.grpc.netty.NettyChannelBuilder;
import io.netty.handler.ssl.SslContext; import io.netty.handler.ssl.SslContext;
import lnrpc.LightningGrpc; import lnrpc.LightningGrpc;
import lnrpc.LightningGrpc.LightningBlockingStub; import lnrpc.LightningGrpc.LightningBlockingStub;
import lnrpc.Rpc.*; import lnrpc.Rpc.GetInfoRequest;
import lnrpc.Rpc.GetInfoResponse;
import org.apache.commons.codec.binary.Hex;
import javax.net.ssl.SSLException;
import java.io.File; import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.concurrent.Executor;
public class Main { public class Main {
static class MacaroonCallCredential implements CallCredentials {
private final String macaroon;
MacaroonCallCredential(String macaroon) {
this.macaroon = macaroon;
}
public void thisUsesUnstableApi() {}
public void applyRequestMetadata(
MethodDescriptor < ? , ? > methodDescriptor,
Attributes attributes,
Executor executor,
final MetadataApplier metadataApplier
) {
String authority = attributes.get(ATTR_AUTHORITY);
System.out.println(authority);
executor.execute(new Runnable() {
public void run() {
try {
Metadata headers = new Metadata();
Metadata.Key < String > macaroonKey = Metadata.Key.of("macaroon", Metadata.ASCII_STRING_MARSHALLER);
headers.put(macaroonKey, macaroon);
metadataApplier.apply(headers);
} catch (Throwable e) {
metadataApplier.fail(Status.UNAUTHENTICATED.withCause(e));
}
}
});
}
}
private static final String CERT_PATH = "/Users/user/Library/Application Support/Lnd/tls.cert"; private static final String CERT_PATH = "/Users/user/Library/Application Support/Lnd/tls.cert";
private static final String MACAROON_PATH = "/Users/user/Library/Application Support/Lnd/admin.macaroon";
private static final String HOST = "localhost"; private static final String HOST = "localhost";
private static final int PORT = 10009; private static final int PORT = 10009;
public static void main(String... args) throws SSLException { public static void main(String...args) throws IOException {
SslContext sslContext = GrpcSslContexts.forClient().trustManager(new File(CERT_PATH)).build(); SslContext sslContext = GrpcSslContexts.forClient().trustManager(new File(CERT_PATH)).build();
NettyChannelBuilder channelBuilder = NettyChannelBuilder.forAddress(HOST, PORT); NettyChannelBuilder channelBuilder = NettyChannelBuilder.forAddress(HOST, PORT);
ManagedChannel channel = channelBuilder.sslContext(sslContext).build(); ManagedChannel channel = channelBuilder.sslContext(sslContext).build();
LightningBlockingStub stub = LightningGrpc.newBlockingStub(channel);
String macaroon =
Hex.encodeHexString(
Files.readAllBytes(Paths.get(MACAROON_PATH))
);
LightningBlockingStub stub = LightningGrpc
.newBlockingStub(channel)
.withCallCredentials(new MacaroonCallCredential(macaroon));
GetInfoResponse response = stub.getInfo(GetInfoRequest.getDefaultInstance()); GetInfoResponse response = stub.getInfo(GetInfoRequest.getDefaultInstance());
System.out.println(response.getIdentityPubkey()); System.out.println(response.getIdentityPubkey());