/
server.go
162 lines (133 loc) · 3.37 KB
/
server.go
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package gochat
import (
"github.com/simonz05/godis"
"log"
)
// Server is the main interface to perform the backend functions of text chatting.
type Server interface {
// Close the interface
Quit()
// CreateArea creates a Chat Area.
CreateArea(area *Area) (err error)
// DeleteArea deletes a Chat Area.
DeleteArea(area *Area)
// JoinArea lets a user join an area.
JoinArea(area *Area, user *User) (err error)
// LeaveArea lets a user leave an area
LeaveArea(area *Area, user *User) (err error)
// ListAreas will list all available areas.
ListAreas() (areas []Area, err error)
// ListUsers will list the users in the area given.
ListUsers(area *Area) (users []User, err error)
// ListMessages will list the current messages in an area.
ListMessages(area *Area) (msgs []Message, err error)
}
type tcRedis struct {
db *godis.Client
}
var areasToken string = "textchat:Areas"
func NewServer() Server {
var t tcRedis
t.db = godis.New(Cfg.DbAddr, Cfg.DbDb, Cfg.DbPassword)
return &t
}
func (t *tcRedis) Quit() {
t.db.Quit()
}
func (t *tcRedis) CreateArea(area *Area) (err error) {
s, err := Serialize(area)
if err != nil {
return err
}
unique, err := t.db.Sadd(areasToken, s)
if err != nil {
return throw("Area could not be created!", area.String(), err.Error())
}
if !unique {
log.Println("Non-unique area created.", area.String())
return nil
}
msg := area.welcome()
s, err = Serialize(msg)
if err != nil {
return err
}
_, err = t.db.Publish(area.token("Updates"), s)
if err != nil {
return err
}
return nil
}
func (t *tcRedis) DeleteArea(area *Area) {
t.db.Del(area.token("Users"), area.token("Messages"), area.token("Updates"))
s, err := Serialize(area)
if err != nil {
log.Println("Error serializing area for removal!", err)
}
t.db.Srem(areasToken, s)
}
func (t *tcRedis) JoinArea(area *Area, user *User) error {
s, err := Serialize(user)
if err != nil {
return err
}
unique, err := t.db.Sadd(area.token("Users"), s)
if err != nil {
return err
}
if !unique {
return throw("JoinArea: User %s is not unique to area %s.", user.String(), area.String())
}
return nil
}
func (t *tcRedis) LeaveArea(area *Area, user *User) error {
s, err := Serialize(user)
if err != nil {
return err
}
_, err = t.db.Srem(area.token("Users"), s)
if err != nil {
return throw("LeaveArea: User %s is not part of Area %s.", user.String(), area.String())
}
return nil
}
func (t *tcRedis) ListAreas() (areas []Area, err error) {
reply, err := t.db.Smembers(areasToken)
if err != nil {
return nil, err
}
areasBytes := reply.BytesArray()
areas = make([]Area, len(areasBytes))
for i, a := range areasBytes {
area := &areas[i]
Deserialize(a, area)
}
return areas, nil
}
func (t *tcRedis) ListUsers(area *Area) (users []User, err error) {
reply, err := t.db.Smembers(area.token("Users"))
if err != nil {
return nil, err
}
usersBytes := reply.BytesArray()
users = make([]User, len(usersBytes))
for i, u := range usersBytes {
user := &users[i]
Deserialize(u, user)
}
return users, nil
}
func (t *tcRedis) ListMessages(area *Area) (msgs []Message, err error) {
rep, err := t.db.Lrange(area.token("Messages"), 0, -1)
if err != nil {
return nil, err
}
msgsBytes := rep.BytesArray()
msgs = make([]Message, len(msgsBytes))
for i, m := range msgsBytes {
msg := &msgs[i]
Deserialize(m, msg)
msgs[i].User = new(User)
}
return msgs, nil
}