grpc.go

Documentation: github.com/chaos-mesh/chaos-mesh/pkg/utils

     1  // Copyright 2019 Chaos Mesh Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package utils
    15  
    16  import (
    17  	"context"
    18  	"fmt"
    19  	"os"
    20  	"time"
    21  
    22  	"github.com/pkg/errors"
    23  	"google.golang.org/grpc"
    24  	v1 "k8s.io/api/core/v1"
    25  	"k8s.io/apimachinery/pkg/types"
    26  
    27  	"sigs.k8s.io/controller-runtime/pkg/client"
    28  )
    29  
    30  // DefaultRPCTimeout specifies default timeout of RPC between controller and chaos-operator
    31  const DefaultRPCTimeout = 60 * time.Second
    32  
    33  // RPCTimeout specifies timeout of RPC between controller and chaos-operator
    34  var RPCTimeout = DefaultRPCTimeout
    35  
    36  // CreateGrpcConnection create a grpc connection with given port
    37  func CreateGrpcConnection(ctx context.Context, c client.Client, pod *v1.Pod, port int) (*grpc.ClientConn, error) {
    38  	nodeName := pod.Spec.NodeName
    39  	log.Info("Creating client to chaos-daemon", "node", nodeName)
    40  
    41  	ns := os.Getenv("NAMESPACE")
    42  	if len(ns) == 0 {
    43  		return nil, errors.Errorf("fail to find NAMESPACE")
    44  	}
    45  	var endpoints v1.Endpoints
    46  	err := c.Get(ctx, types.NamespacedName{
    47  		Namespace: ns,
    48  		Name:      "chaos-daemon",
    49  	}, &endpoints)
    50  	if err != nil {
    51  		return nil, err
    52  	}
    53  
    54  	daemonIP := findIPOnEndpoints(&endpoints, nodeName)
    55  	if len(daemonIP) == 0 {
    56  		return nil, errors.Errorf("cannot find daemonIP on node %s in related Endpoints %v", nodeName, endpoints)
    57  	}
    58  	return CreateGrpcConnectionWithAddress(daemonIP, port)
    59  }
    60  
    61  // CreateGrpcConnectionWithAddress create a grpc connection with given port and address
    62  func CreateGrpcConnectionWithAddress(address string, port int) (*grpc.ClientConn, error) {
    63  	conn, err := grpc.Dial(fmt.Sprintf("%s:%d", address, port),
    64  		grpc.WithInsecure(),
    65  		grpc.WithUnaryInterceptor(TimeoutClientInterceptor))
    66  	if err != nil {
    67  		return nil, err
    68  	}
    69  	return conn, nil
    70  }
    71  
    72  // TimeoutClientInterceptor wraps the RPC with a timeout.
    73  func TimeoutClientInterceptor(ctx context.Context, method string, req, reply interface{},
    74  	cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error {
    75  	ctx, cancel := context.WithTimeout(ctx, RPCTimeout)
    76  	defer cancel()
    77  	return invoker(ctx, method, req, reply, cc, opts...)
    78  }
    79  
    80  // TimeoutServerInterceptor ensures the context is intact before handling over the
    81  // request to application.
    82  func TimeoutServerInterceptor(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo,
    83  	handler grpc.UnaryHandler) (interface{}, error) {
    84  	if ctx.Err() != nil {
    85  		return nil, ctx.Err()
    86  	}
    87  	return handler(ctx, req)
    88  }
    89  
    90  func findIPOnEndpoints(e *v1.Endpoints, nodeName string) string {
    91  	for _, subset := range e.Subsets {
    92  		for _, addr := range subset.Addresses {
    93  			if addr.NodeName != nil && *addr.NodeName == nodeName {
    94  				return addr.IP
    95  			}
    96  		}
    97  	}
    98  
    99  	return ""
   100  }
   101