utils.go

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

     1  // Copyright 2020 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 grpc
    15  
    16  import (
    17  	"context"
    18  	"fmt"
    19  	"time"
    20  
    21  	"github.com/pkg/errors"
    22  	"google.golang.org/grpc"
    23  	v1 "k8s.io/api/core/v1"
    24  	"k8s.io/apimachinery/pkg/types"
    25  	ctrl "sigs.k8s.io/controller-runtime"
    26  
    27  	"github.com/chaos-mesh/chaos-mesh/controllers/config"
    28  
    29  	"sigs.k8s.io/controller-runtime/pkg/client"
    30  )
    31  
    32  // DefaultRPCTimeout specifies default timeout of RPC between controller and chaos-operator
    33  const DefaultRPCTimeout = 60 * time.Second
    34  
    35  // RPCTimeout specifies timeout of RPC between controller and chaos-operator
    36  var RPCTimeout = DefaultRPCTimeout
    37  
    38  var log = ctrl.Log.WithName("util")
    39  
    40  // CreateGrpcConnection create a grpc connection with given port
    41  func CreateGrpcConnection(ctx context.Context, c client.Client, pod *v1.Pod, port int) (*grpc.ClientConn, error) {
    42  	nodeName := pod.Spec.NodeName
    43  	log.Info("Creating client to chaos-daemon", "node", nodeName)
    44  
    45  	ns := config.ControllerCfg.Namespace
    46  	var endpoints v1.Endpoints
    47  	err := c.Get(ctx, types.NamespacedName{
    48  		Namespace: ns,
    49  		Name:      "chaos-daemon",
    50  	}, &endpoints)
    51  	if err != nil {
    52  		return nil, err
    53  	}
    54  
    55  	daemonIP := findIPOnEndpoints(&endpoints, nodeName)
    56  	if len(daemonIP) == 0 {
    57  		return nil, errors.Errorf("cannot find daemonIP on node %s in related Endpoints %v", nodeName, endpoints)
    58  	}
    59  	return CreateGrpcConnectionWithAddress(daemonIP, port)
    60  }
    61  
    62  // CreateGrpcConnectionWithAddress create a grpc connection with given port and address
    63  func CreateGrpcConnectionWithAddress(address string, port int) (*grpc.ClientConn, error) {
    64  	conn, err := grpc.Dial(fmt.Sprintf("%s:%d", address, port),
    65  		grpc.WithInsecure(),
    66  		grpc.WithUnaryInterceptor(TimeoutClientInterceptor))
    67  	if err != nil {
    68  		return nil, err
    69  	}
    70  	return conn, nil
    71  }
    72  
    73  func findIPOnEndpoints(e *v1.Endpoints, nodeName string) string {
    74  	for _, subset := range e.Subsets {
    75  		for _, addr := range subset.Addresses {
    76  			if addr.NodeName != nil && *addr.NodeName == nodeName {
    77  				return addr.IP
    78  			}
    79  		}
    80  	}
    81  
    82  	return ""
    83  }
    84  
    85  // TimeoutClientInterceptor wraps the RPC with a timeout.
    86  func TimeoutClientInterceptor(ctx context.Context, method string, req, reply interface{},
    87  	cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error {
    88  	ctx, cancel := context.WithTimeout(ctx, RPCTimeout)
    89  	defer cancel()
    90  	return invoker(ctx, method, req, reply, cc, opts...)
    91  }
    92  
    93  // TimeoutServerInterceptor ensures the context is intact before handling over the
    94  // request to application.
    95  func TimeoutServerInterceptor(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo,
    96  	handler grpc.UnaryHandler) (interface{}, error) {
    97  	if ctx.Err() != nil {
    98  		return nil, ctx.Err()
    99  	}
   100  	return handler(ctx, req)
   101  }
   102