forked from tristanwietsma/jack
/
server.go
144 lines (113 loc) · 2.79 KB
/
server.go
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/*
Copyright 2013 Tristan Wietsma
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package jack
import (
"github.com/tristanwietsma/metastore"
"log"
"net"
"strconv"
)
// StartServer starts up a listened at 127.0.0.1:<port> with a key space distributed over a given number of buckets.
func StartServer(port uint, buckets uint) {
if buckets == 0 {
log.Fatalf("<buckets> be positive. got %d.\n", buckets)
}
var db metastore.MetaStore
db.Init(buckets)
log.Printf("created storage with %d buckets\n", buckets)
// listening on localhost
addr := "127.0.0.1:" + strconv.FormatUint(uint64(port), 10)
listener, err := net.Listen("tcp", addr)
if err != nil {
log.Fatal(err)
}
defer listener.Close()
log.Printf("server listening on port %d\n", port)
for {
c, err := listener.Accept()
if err != nil {
log.Fatal(err)
}
go handleConnection(c, &db)
}
}
func closeConnection(c net.Conn) {
log.Printf("[%s] closed connection\n", c.RemoteAddr())
c.Close()
}
func handleConnection(c net.Conn, dbase *metastore.MetaStore) {
defer closeConnection(c)
fromAddr := c.RemoteAddr()
log.Printf("[%s] new connection\n", fromAddr)
buf := make([]byte, 1024)
bucketIndex := dbase.GetHasher()
NEXTMESSAGE:
_, err := c.Read(buf)
if err != nil {
return
}
msg, err := Parse(buf)
if err != nil {
return
}
i := bucketIndex(msg.key)
switch msg.cmd {
case GET:
if value, ok := (*dbase).Bucket[i].Get(string(msg.key)); ok {
b := []byte(value)
b = append(b, EOM)
_, err = c.Write(b)
} else {
_, err = c.Write([]byte{EOM})
}
if err != nil {
return
}
goto NEXTMESSAGE
case SET:
(*dbase).Bucket[i].Set(string(msg.key), string(msg.arg))
_, err = c.Write([]byte{SUCCESS})
if err != nil {
return
}
goto NEXTMESSAGE
case DEL:
(*dbase).Bucket[i].Delete(string(msg.key))
_, err = c.Write([]byte{SUCCESS})
if err != nil {
return
}
goto NEXTMESSAGE
case PUB:
(*dbase).Bucket[i].Publish(string(msg.key), string(msg.arg))
_, err = c.Write([]byte{SUCCESS})
if err != nil {
return
}
goto NEXTMESSAGE
case SUB:
outgoing := make(chan string)
(*dbase).Bucket[i].Subscribe(string(msg.key), outgoing)
for value := range outgoing {
b := []byte(value)
b = append(b, EOM)
_, err := c.Write(b)
if err != nil {
close(outgoing)
return
}
}
default:
return
}
}