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resolvers.go
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/
resolvers.go
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//go:generate gorunpkg github.com/vektah/gqlgen -typemap types.json -out generated.go
package chat
import (
context "context"
"math/rand"
"sync"
"time"
)
type resolvers struct {
Rooms map[string]*Chatroom
mu sync.Mutex
}
func New() *resolvers {
return &resolvers{
Rooms: map[string]*Chatroom{},
}
}
type Chatroom struct {
Name string
Messages []Message
Observers map[string]chan Message
}
func (r *resolvers) Mutation_post(ctx context.Context, text string, userName string, roomName string) (Message, error) {
r.mu.Lock()
room := r.Rooms[roomName]
if room == nil {
room = &Chatroom{Name: roomName, Observers: map[string]chan Message{}}
r.Rooms[roomName] = room
}
r.mu.Unlock()
message := Message{
ID: randString(8),
CreatedAt: time.Now(),
Text: text,
CreatedBy: userName,
}
room.Messages = append(room.Messages, message)
r.mu.Lock()
for _, observer := range room.Observers {
observer <- message
}
r.mu.Unlock()
return message, nil
}
func (r *resolvers) Query_room(ctx context.Context, name string) (*Chatroom, error) {
r.mu.Lock()
room := r.Rooms[name]
if room == nil {
room = &Chatroom{Name: name, Observers: map[string]chan Message{}}
r.Rooms[name] = room
}
r.mu.Unlock()
return room, nil
}
func (r *resolvers) Subscription_messageAdded(ctx context.Context, roomName string) (<-chan Message, error) {
r.mu.Lock()
room := r.Rooms[roomName]
if room == nil {
room = &Chatroom{Name: roomName, Observers: map[string]chan Message{}}
r.Rooms[roomName] = room
}
r.mu.Unlock()
id := randString(8)
events := make(chan Message, 1)
go func() {
<-ctx.Done()
r.mu.Lock()
delete(room.Observers, id)
r.mu.Unlock()
}()
r.mu.Lock()
room.Observers[id] = events
r.mu.Unlock()
return events, nil
}
var letterRunes = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
func randString(n int) string {
b := make([]rune, n)
for i := range b {
b[i] = letterRunes[rand.Intn(len(letterRunes))]
}
return string(b)
}