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backend.go
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backend.go
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// Copyright 2018 Istio Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package policy
//go:generate $GOPATH/src/istio.io/istio/bin/protoc.sh --gogo_out=plugins=grpc:. controller.proto
import (
"context"
"fmt"
"net"
"sync"
google_rpc "github.com/gogo/googleapis/google/rpc"
"github.com/golang/protobuf/proto"
"google.golang.org/grpc"
"istio.io/api/mixer/adapter/model/v1beta1"
istio_mixer_adapter_model_v1beta11 "istio.io/api/mixer/adapter/model/v1beta1"
"istio.io/istio/mixer/template/checknothing"
"istio.io/istio/mixer/template/metric"
"istio.io/istio/pkg/log"
)
const (
// DefaultPort for the backend service.
DefaultPort = 1071
)
var scope = log.RegisterScope("fakes", "Scope for all fakes", 0)
// Backend is the implementation of a Fake policy backend. It can be ran either in a cluster or locally.
type Backend struct {
port int
listener net.Listener
server *grpc.Server
settings settings
lock sync.Mutex
reports []proto.Message
}
var _ metric.HandleMetricServiceServer = &Backend{}
var _ checknothing.HandleCheckNothingServiceServer = &Backend{}
var _ v1beta1.InfrastructureBackendServer = &Backend{}
var _ ControllerServiceServer = &Backend{}
// NewPolicyBackend returns a new instance of Backend.
func NewPolicyBackend(port int) *Backend {
return &Backend{
settings: make(map[string]string),
port: port,
}
}
// Port returns the port number of the backend.
func (b *Backend) Port() int {
return b.port
}
// Start the gRPC service for the policy backend.
func (b *Backend) Start() error {
scope.Info("Starting Policy Backend")
listener, err := net.Listen("tcp", fmt.Sprintf(":%d", b.port))
if err != nil {
return err
}
b.port = listener.Addr().(*net.TCPAddr).Port
grpcServer := grpc.NewServer()
v1beta1.RegisterInfrastructureBackendServer(grpcServer, b)
metric.RegisterHandleMetricServiceServer(grpcServer, b)
checknothing.RegisterHandleCheckNothingServiceServer(grpcServer, b)
RegisterControllerServiceServer(grpcServer, b)
go func() {
scope.Infof("Starting the GRPC service at port: %d", b.port)
_ = grpcServer.Serve(listener)
}()
b.listener = listener
b.server = grpcServer
return nil
}
// Set method of the control service.
func (b *Backend) Set(ctx context.Context, req *SetRequest) (*SetResponse, error) {
b.lock.Lock()
defer b.lock.Unlock()
for k, v := range req.Settings {
scope.Infof("Backend.Set %s = %s", k, v)
b.settings[k] = v
}
return &SetResponse{}, nil
}
// Reset the internal state of the service.
func (b *Backend) Reset(ctx context.Context, req *ResetRequest) (*ResetResponse, error) {
scope.Infof("Backend.Reset %v", req)
b.lock.Lock()
defer b.lock.Unlock()
for k := range b.settings {
delete(b.settings, k)
}
b.reports = b.reports[0:0]
return &ResetResponse{}, nil
}
// GetReports method of the control service.
func (b *Backend) GetReports(ctx context.Context, req *GetReportsRequest) (*GetReportsResponse, error) {
scope.Debugf("Backend.GetReports %v", req)
b.lock.Lock()
defer b.lock.Unlock()
resp := &GetReportsResponse{}
for _, ins := range b.reports {
a, err := toAny(ins)
if err != nil {
return nil, err
}
resp.Instances = append(resp.Instances, a)
}
return resp, nil
}
// Close closes the gRPC backend and the associated listener.
func (b *Backend) Close() error {
scope.Info("Backend.Close")
b.server.Stop()
_ = b.listener.Close()
return nil
}
// Validate is an implementation InfrastructureBackendServer.Validate.
func (b *Backend) Validate(ctx context.Context, req *v1beta1.ValidateRequest) (
*v1beta1.ValidateResponse, error) {
scope.Infof("Backend.Validate %v", req)
return &v1beta1.ValidateResponse{
Status: &google_rpc.Status{
Code: int32(google_rpc.OK),
},
}, nil
}
// CreateSession is an implementation InfrastructureBackendServer.CreateSession.
func (b *Backend) CreateSession(ctx context.Context, req *v1beta1.CreateSessionRequest) (
*v1beta1.CreateSessionResponse, error) {
scope.Infof("Backend.CreateSession %v", req)
return &v1beta1.CreateSessionResponse{
Status: &google_rpc.Status{
Code: int32(google_rpc.OK),
},
}, nil
}
// CloseSession is an implementation InfrastructureBackendServer.CloseSession.
func (b *Backend) CloseSession(ctx context.Context, req *v1beta1.CloseSessionRequest) (
*v1beta1.CloseSessionResponse, error) {
scope.Infof("Backend.CloseSession %v", req)
return &v1beta1.CloseSessionResponse{
Status: &google_rpc.Status{
Code: int32(google_rpc.OK),
},
}, nil
}
// HandleMetric is an implementation HandleMetricServiceServer.HandleMetric.
func (b *Backend) HandleMetric(ctx context.Context, req *metric.HandleMetricRequest) (
*istio_mixer_adapter_model_v1beta11.ReportResult, error) {
scope.Infof("Backend.HandleMetric %v", req)
b.lock.Lock()
defer b.lock.Unlock()
for _, ins := range req.Instances {
b.reports = append(b.reports, ins)
}
return &istio_mixer_adapter_model_v1beta11.ReportResult{}, nil
}
// HandleCheckNothing is an implementation of HandleCheckNothingServiceServer.HandleCheckNothing.
func (b *Backend) HandleCheckNothing(ctx context.Context, req *checknothing.HandleCheckNothingRequest) (
*istio_mixer_adapter_model_v1beta11.CheckResult, error) {
scope.Infof("Backend.HandleCheckNothing %v", req)
b.lock.Lock()
defer b.lock.Unlock()
if b.settings.getDenyCheck() {
return &istio_mixer_adapter_model_v1beta11.CheckResult{
Status: google_rpc.Status{
Code: int32(google_rpc.UNAUTHENTICATED),
Message: "bypass-backend-unauthenticated",
},
}, nil
}
return &istio_mixer_adapter_model_v1beta11.CheckResult{
Status: google_rpc.Status{
Code: int32(google_rpc.OK),
},
ValidDuration: 0,
ValidUseCount: 1,
}, nil
}