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Java interceptors which can be used to monitor Grpc services using Prometheus.

There is a newer version: 0.6.0

// Copyright 2016 Dino Wernli. All Rights Reserved. See LICENSE for licensing terms.

package me.dinowernli.grpc.prometheus;

import io.grpc.MethodDescriptor;
import io.grpc.MethodDescriptor.MethodType;

/** Knows how to extract information about a single grpc method. */
class GrpcMethod {
  private final String serviceName;
  private final String methodName;
  private final MethodType type;

  static GrpcMethod of(MethodDescriptor method) {
    String serviceName = MethodDescriptor.extractFullServiceName(method.getFullMethodName());

    // Full method names are of the form: "full.serviceName/MethodName". We extract the last part.
    String methodName = method.getFullMethodName().substring(serviceName.length() + 1);
    return new GrpcMethod(serviceName, methodName, method.getType());
  }

  private GrpcMethod(String serviceName, String methodName, MethodType type) {
    this.serviceName = serviceName;
    this.methodName = methodName;
    this.type = type;
  }

  String serviceName() {
    return serviceName;
  }

  String methodName() {
    return methodName;
  }

  String type() {
    return type.toString();
  }

  boolean streamsRequests() {
    return type == MethodType.CLIENT_STREAMING || type == MethodType.BIDI_STREAMING;
  }

  boolean streamsResponses() {
    return type == MethodType.SERVER_STREAMING || type == MethodType.BIDI_STREAMING;
  }
}