/
nosession.go
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/
nosession.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.
// nolint:lll
//go:generate go run $GOPATH/src/istio.io/istio/mixer/tools/mixgen/main.go adapter -n prometheus-nosession -s=false -c $GOPATH/src/istio.io/istio/mixer/adapter/prometheus/config/config.proto_descriptor -t metric -o prometheus-nosession.yaml
package prometheus
import (
"bytes"
"context"
"fmt"
"io"
"net"
"sync"
"google.golang.org/grpc"
adptModel "istio.io/api/mixer/adapter/model/v1beta1"
"istio.io/api/policy/v1beta1"
"istio.io/istio/mixer/adapter/prometheus"
"istio.io/istio/mixer/adapter/prometheus/config"
"istio.io/istio/mixer/pkg/adapter"
"istio.io/istio/mixer/pkg/pool"
"istio.io/istio/mixer/pkg/runtime/handler"
"istio.io/istio/mixer/template/metric"
)
type (
// Server is basic server interface
Server interface {
Addr() string
Close() error
PromPort() int
Run()
}
promServer interface {
io.Closer
Port() int
}
// NoSessionServer models no session adapter backend.
NoSessionServer struct {
listener net.Listener
shutdown chan error
server *grpc.Server
rawcfg []byte
builder adapter.HandlerBuilder
env adapter.Env
builderLock sync.RWMutex
h metric.Handler
promServer promServer
}
)
var _ metric.HandleMetricServiceServer = &NoSessionServer{}
func (s *NoSessionServer) getHandler(rawcfg []byte) (metric.Handler, error) {
s.builderLock.RLock()
if 0 == bytes.Compare(rawcfg, s.rawcfg) {
h := s.h
s.builderLock.RUnlock()
return h, nil
}
s.builderLock.RUnlock()
// establish session
cfg := &config.Params{}
if err := cfg.Unmarshal(rawcfg); err != nil {
return nil, err
}
s.builderLock.Lock()
defer s.builderLock.Unlock()
// check again if someone else beat you to this.
if 0 == bytes.Compare(rawcfg, s.rawcfg) {
return s.h, nil
}
s.env.Logger().Infof("Loaded handler with: %v", cfg)
s.builder.SetAdapterConfig(cfg)
if ce := s.builder.Validate(); ce != nil {
return nil, ce
}
h, err := s.builder.Build(context.Background(), s.env)
if err != nil {
s.env.Logger().Errorf("could not build: %v", err)
return nil, err
}
s.rawcfg = rawcfg
s.h = h.(metric.Handler)
return s.h, err
}
func instances(in []*metric.InstanceMsg) []*metric.Instance {
out := make([]*metric.Instance, 0, len(in))
for _, inst := range in {
out = append(out, &metric.Instance{
Name: inst.Name,
Value: decodeValue(inst.Value.GetValue()),
Dimensions: decodeDimensions(inst.Dimensions),
})
}
return out
}
func decodeDimensions(in map[string]*v1beta1.Value) map[string]interface{} {
out := make(map[string]interface{}, len(in))
for k, v := range in {
out[k] = decodeValue(v.GetValue())
}
return out
}
func decodeValue(in interface{}) interface{} {
switch t := in.(type) {
case *v1beta1.Value_StringValue:
return t.StringValue
case *v1beta1.Value_Int64Value:
return t.Int64Value
case *v1beta1.Value_DoubleValue:
return t.DoubleValue
default:
return fmt.Sprintf("%v", in)
}
}
// HandleMetric records metric entries and responds with the programmed response
func (s *NoSessionServer) HandleMetric(ctx context.Context, r *metric.HandleMetricRequest) (*adptModel.ReportResult, error) {
h, err := s.getHandler(r.AdapterConfig.Value)
if err != nil {
return nil, err
}
if err = h.HandleMetric(ctx, instances(r.Instances)); err != nil {
s.env.Logger().Errorf("Could not process: %v", err)
return nil, err
}
return &adptModel.ReportResult{}, nil
}
// Addr returns the listening address of the server
func (s *NoSessionServer) Addr() string {
return s.listener.Addr().String()
}
// PromPort returns the listening address of the prometheus server
func (s *NoSessionServer) PromPort() int {
return s.promServer.Port()
}
// Run starts the server run
func (s *NoSessionServer) Run() {
s.shutdown = make(chan error, 1)
go func() {
err := s.server.Serve(s.listener)
// notify closer we're done
s.shutdown <- err
}()
}
// Wait waits for server to stop
func (s *NoSessionServer) Wait() error {
if s.shutdown == nil {
return fmt.Errorf("server not running")
}
err := <-s.shutdown
s.shutdown = nil
return err
}
// Close gracefully shuts down the server
func (s *NoSessionServer) Close() error {
if s.shutdown != nil {
s.server.GracefulStop()
_ = s.Wait()
}
if s.listener != nil {
_ = s.listener.Close()
}
if s.promServer != nil {
return s.promServer.Close()
}
return nil
}
// NewNoSessionServer creates a new no session server from given args.
func NewNoSessionServer(addr uint16, promAddr uint16) (*NoSessionServer, error) {
saddr := fmt.Sprintf(":%d", addr)
pddr := fmt.Sprintf(":%d", promAddr)
gp := pool.NewGoroutinePool(5, false)
inf, srv := prometheus.GetInfoWithAddr(pddr)
s := &NoSessionServer{builder: inf.NewBuilder(),
env: handler.NewEnv(0, "prometheus-nosession", gp),
rawcfg: []byte{0xff, 0xff},
}
var err error
if s.listener, err = net.Listen("tcp", saddr); err != nil {
_ = s.Close()
return nil, fmt.Errorf("unable to listen on socket: %v", err)
}
fmt.Printf("listening on :%v\n", s.listener.Addr())
s.server = grpc.NewServer()
metric.RegisterHandleMetricServiceServer(s.server, s)
if _, err = s.getHandler(nil); err != nil {
return nil, err
}
s.promServer = srv
return s, nil
}