forked from datacoda/fudge-edge
/
data.go
executable file
·131 lines (110 loc) · 2.79 KB
/
data.go
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package main
import (
"errors"
"sync"
"log"
"github.com/garyburd/redigo/redis"
"github.com/garyburd/redigo/redisx"
)
var (
ErrAlreadyExists = errors.New("route already exists")
)
type DB interface {
PurgeRoutes()
GetRoutes() []string
CreateRoute(route *RouteInfo) bool
AddBackend(hostname string, backend string) bool
RemoveBackend(hostname string, backend string) bool
}
// Thread-safe in-memory map of albums.
type routesDB struct {
sync.RWMutex
m map[int]*Route
seq int
rclient redis.Conn
}
// The one and only database instance.
var db DB
func init() {
rc, err := redis.Dial("tcp", ":6379")
if err != nil {
log.Fatal(err)
}
db = &routesDB{
m: make(map[int]*Route),
rclient: rc,
}
initExample()
}
func initExample() {
// Fill the database
db.CreateRoute(&RouteInfo{ Hostname: "foobar.com", Sticky:true })
db.AddBackend("foobar.com", "http://127.0.0.1:8081")
db.AddBackend("foobar.com", "http://127.0.0.1:8082")
db.AddBackend("foobar.com", "127.1.1.55")
db.RemoveBackend("foobar.com", "127.1.1.55")
db.CreateRoute(&RouteInfo{ Hostname: "example.com", Sticky:true })
db.AddBackend("example.com", "http://127.0.0.1:8083")
db.CreateRoute(&RouteInfo{ Hostname: "*.example.com", Sticky:false })
db.AddBackend("*.example.com", "127.1.1.45")
}
func (db *routesDB) PurgeRoutes() {
_, err := db.rclient.Do("DEL", "index:hostnames")
if err != nil {
log.Fatal(err)
}
}
func (db *routesDB) GetRoutes() []string {
values, err := redis.Values(db.rclient.Do("SMEMBERS", "index:hostnames"))
if err != nil {
log.Fatal(err)
}
var hostnames []string
for len(values) > 0 {
var hostname string
values, err = redis.Scan(values, &hostname)
if err != nil {
panic(err)
}
hostnames = append(hostnames, hostname)
}
return hostnames
}
// Add creates a new album and returns its id, or an error.
func (db *routesDB) CreateRoute(route *RouteInfo) bool {
key := "routeinfo:" + route.Hostname
_, err := db.rclient.Do("HMSET", redisx.AppendStruct([]interface{}{key}, route)...)
if err != nil {
log.Fatal(err)
}
// Add to index
_, err = db.rclient.Do("SADD", "index:hostnames", route.Hostname)
if err != nil {
log.Fatal(err)
}
return true
}
func (db *routesDB) AddBackend(hostname string, backend string) bool {
_, err := db.rclient.Do("ZADD", "backend:"+hostname, 1, backend)
if err != nil {
log.Fatal(err)
}
return true
}
func (db *routesDB) RemoveBackend(hostname string, backend string) bool {
_, err := db.rclient.Do("ZREM", "backend:"+hostname, backend)
if err != nil {
log.Fatal(err)
}
return true
}
type RouteInfo struct {
Hostname string `json:"hostname"`
Sticky bool `json:"sticky"`
Varnish bool `json:"varnish"`
VarnishHandler string `json:"varnish_handler"`
}
type Route struct {
Id int `json:"id"`
Hostname string `json:"hostname"`
}