/
server.go
205 lines (169 loc) · 4.93 KB
/
server.go
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package rate
import (
"encoding/json"
"fmt"
"gopkg.in/mgo.v2"
"gopkg.in/mgo.v2/bson"
// "io/ioutil"
"net"
// "os"
"sort"
"time"
"sync"
"github.com/rs/zerolog/log"
"github.com/google/uuid"
"github.com/grpc-ecosystem/grpc-opentracing/go/otgrpc"
"github.com/harlow/go-micro-services/registry"
pb "github.com/harlow/go-micro-services/services/rate/proto"
"github.com/harlow/go-micro-services/tls"
"github.com/opentracing/opentracing-go"
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/keepalive"
"strings"
"github.com/bradfitz/gomemcache/memcache"
)
const name = "srv-rate"
// Server implements the rate service
type Server struct {
Tracer opentracing.Tracer
Port int
IpAddr string
MongoSession *mgo.Session
Registry *registry.Client
MemcClient *memcache.Client
uuid string
}
// Run starts the server
func (s *Server) Run() error {
opentracing.SetGlobalTracer(s.Tracer)
if s.Port == 0 {
return fmt.Errorf("server port must be set")
}
s.uuid = uuid.New().String()
opts := []grpc.ServerOption{
grpc.KeepaliveParams(keepalive.ServerParameters{
Timeout: 120 * time.Second,
}),
grpc.KeepaliveEnforcementPolicy(keepalive.EnforcementPolicy{
PermitWithoutStream: true,
}),
grpc.UnaryInterceptor(
otgrpc.OpenTracingServerInterceptor(s.Tracer),
),
}
if tlsopt := tls.GetServerOpt(); tlsopt != nil {
opts = append(opts, tlsopt)
}
srv := grpc.NewServer(opts...)
pb.RegisterRateServer(srv, s)
lis, err := net.Listen("tcp", fmt.Sprintf(":%d", s.Port))
if err != nil {
log.Fatal().Msgf("failed to listen: %v", err)
}
// register the service
// jsonFile, err := os.Open("config.json")
// if err != nil {
// fmt.Println(err)
// }
// defer jsonFile.Close()
// byteValue, _ := ioutil.ReadAll(jsonFile)
// var result map[string]string
// json.Unmarshal([]byte(byteValue), &result)
err = s.Registry.Register(name, s.uuid, s.IpAddr, s.Port)
if err != nil {
return fmt.Errorf("failed register: %v", err)
}
log.Info().Msg("Successfully registered in consul")
return srv.Serve(lis)
}
// Shutdown cleans up any processes
func (s *Server) Shutdown() {
s.Registry.Deregister(s.uuid)
}
// GetRates gets rates for hotels for specific date range.
func (s *Server) GetRates(ctx context.Context, req *pb.Request) (*pb.Result, error) {
res := new(pb.Result)
// session, err := mgo.Dial("mongodb-rate")
// if err != nil {
// panic(err)
// }
// defer session.Close()
ratePlans := make(RatePlans, 0)
hotelIds := []string{}
rateMap := make(map[string]struct{})
for _, hotelID := range req.HotelIds {
hotelIds = append(hotelIds, hotelID)
rateMap[hotelID] = struct{}{}
}
// first check memcached(get-multi)
memSpan, _ := opentracing.StartSpanFromContext(ctx, "memcached_get_multi_rate")
memSpan.SetTag("span.kind", "client")
resMap, err := s.MemcClient.GetMulti(hotelIds)
memSpan.Finish()
var wg sync.WaitGroup
var mutex sync.Mutex
if err != nil && err != memcache.ErrCacheMiss {
log.Panic().Msgf("Memmcached error while trying to get hotel [id: %v]= %s", hotelIds, err)
} else {
for hotelId, item := range resMap {
rateStrs := strings.Split(string(item.Value), "\n")
log.Trace().Msgf("memc hit, hotelId = %s,rate strings: %v", hotelId, rateStrs)
for _, rateStr := range rateStrs {
if len(rateStr) != 0 {
rateP := new(pb.RatePlan)
json.Unmarshal([]byte(rateStr), rateP)
ratePlans = append(ratePlans, rateP)
}
}
delete(rateMap, hotelId)
}
wg.Add(len(rateMap))
for hotelId := range rateMap {
go func(id string) {
log.Trace().Msgf("memc miss, hotelId = %s", id)
log.Trace().Msg("memcached miss, set up mongo connection")
// memcached miss, set up mongo connection
session := s.MongoSession.Copy()
defer session.Close()
c := session.DB("rate-db").C("inventory")
memcStr := ""
tmpRatePlans := make(RatePlans, 0)
mongoSpan, _ := opentracing.StartSpanFromContext(ctx, "mongo_rate")
mongoSpan.SetTag("span.kind", "client")
err := c.Find(&bson.M{"hotelId": id}).All(&tmpRatePlans)
mongoSpan.Finish()
if err != nil {
log.Panic().Msgf("Tried to find hotelId [%v], but got error", id, err.Error())
} else {
for _, r := range tmpRatePlans {
mutex.Lock()
ratePlans = append(ratePlans, r)
mutex.Unlock()
rateJson, err := json.Marshal(r)
if err != nil {
log.Error().Msgf("Failed to marshal plan [Code: %v] with error: %s", r.Code, err)
}
memcStr = memcStr + string(rateJson) + "\n"
}
}
go s.MemcClient.Set(&memcache.Item{Key: id, Value: []byte(memcStr)})
defer wg.Done()
}(hotelId)
}
}
wg.Wait()
sort.Sort(ratePlans)
res.RatePlans = ratePlans
return res, nil
}
type RatePlans []*pb.RatePlan
func (r RatePlans) Len() int {
return len(r)
}
func (r RatePlans) Swap(i, j int) {
r[i], r[j] = r[j], r[i]
}
func (r RatePlans) Less(i, j int) bool {
return r[i].RoomType.TotalRate > r[j].RoomType.TotalRate
}