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main.go
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main.go
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package main
import (
"encoding/json"
"io/ioutil"
"log"
"net/http"
"os"
"github.com/chiru1221/microservice-knapsack/client"
pb "github.com/chiru1221/microservice-knapsack/knapsack"
)
type Service interface {
run(input *pb.Input) (*pb.Result, error)
}
type ServiceImpl struct {
client client.Client
}
type ServerImpl struct {
service Service
}
func (service *ServiceImpl) run(input *pb.Input) (*pb.Result, error) {
var (
dp []*pb.DP
i, w int32
)
dp = make([]*pb.DP, input.GetN()+1)
for idx := range dp {
dp[idx] = &pb.DP{Row: make([]int32, input.GetW()+1)}
}
for i = 0; i < input.GetN(); i++ {
for w = 0; w <= input.GetW(); w++ {
result, _ := service.client.CallUpdate(
&pb.KnapsackDP{
I: i,
W: w,
Weight: input.GetWeight()[i],
Value: input.GetValue()[i],
Dp: dp,
},
)
dp[i+1].Row[w] = result.Result
}
}
return &pb.Result{Result: dp[input.N].Row[input.W]}, nil
}
func (server *ServerImpl) index(w http.ResponseWriter, r *http.Request) {
data, err := ioutil.ReadAll(r.Body)
if err != nil {
w.WriteHeader(http.StatusBadRequest)
log.Println(err)
return
}
var input *pb.Input = &pb.Input{}
if err = json.Unmarshal(data, input); err != nil {
w.WriteHeader(http.StatusBadRequest)
log.Println(err)
return
}
result, err := server.service.run(input)
if err != nil {
w.WriteHeader(http.StatusBadRequest)
log.Println(err)
return
}
resp, err := json.Marshal(result)
if err != nil {
w.WriteHeader(http.StatusBadRequest)
log.Println(err)
return
}
w.WriteHeader(http.StatusOK)
w.Write(resp)
}
func main() {
log.Println("Start server")
service := &ServiceImpl{
client: &client.ClientImpl{Addr: os.Getenv("SERVER_ADDR")},
}
if err := service.client.Construct(); err != nil {
log.Fatal(err)
}
defer service.client.Destruct()
server := &ServerImpl{
service: service,
}
http.HandleFunc("/", server.index)
http.HandleFunc("/healthz", func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
})
log.Fatal(http.ListenAndServe(":8080", nil))
}