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grpc2_session.go
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grpc2_session.go
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package main
import (
"coursera/microservices/grpc/session"
"fmt"
"math/rand"
"sync"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
"golang.org/x/net/context"
)
const sessKeyLen = 10
var letterRunes = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
func RandStringRunes(n int) string {
b := make([]rune, n)
for i := range b {
b[i] = letterRunes[rand.Intn(len(letterRunes))]
}
return string(b)
}
// service implementation
type SessionManager struct {
mu sync.RWMutex
sessions map[session.SessionID]*session.Session
}
func NewSessionManager() *SessionManager {
return &SessionManager{
mu: sync.RWMutex{},
sessions: map[session.SessionID]*session.Session{},
}
}
func (sm *SessionManager) Create(ctx context.Context, in *session.Session) (*session.SessionID, error) {
fmt.Println("call Create", in)
header := metadata.Pairs("header-key", "42")
grpc.SendHeader(ctx, header) // header part of metadata
trailer := metadata.Pairs("trailer-key", "3.14")
grpc.SetTrailer(ctx, trailer) // trailer part of metadata
id := &session.SessionID{RandStringRunes(sessKeyLen)}
sm.mu.Lock()
sm.sessions[*id] = in
sm.mu.Unlock()
return id, nil
}
func (sm *SessionManager) Check(ctx context.Context, in *session.SessionID) (*session.Session, error) {
fmt.Println("call Check", in)
sm.mu.RLock()
defer sm.mu.RUnlock()
if sess, ok := sm.sessions[*in]; ok {
return sess, nil
}
return nil, grpc.Errorf(codes.NotFound, "session not found")
}
func (sm *SessionManager) Delete(ctx context.Context, in *session.SessionID) (*session.Nothing, error) {
fmt.Println("call Delete", in)
sm.mu.Lock()
defer sm.mu.Unlock()
delete(sm.sessions, *in)
return &session.Nothing{Dummy: true}, nil
}