mirror of
https://bitbucket.org/s_l_teichmann/mtsatellite
synced 2024-12-23 16:50:18 +01:00
Factored connection handling into separate file.
This commit is contained in:
Sascha L. Teichmann
parent
8a8351e8c1
commit
095164a6c8
206
connection.go
Normal file
206
connection.go
Normal file
@ -0,0 +1,206 @@
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package main
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import (
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"bufio"
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"fmt"
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"log"
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"net"
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leveldb "github.com/jmhodges/levigo"
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)
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var (
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redisOk = []byte("+OK\r\n")
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redisDbError = []byte("-FAIL\r\n")
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redisNoSuchBlock = []byte("$-1\r\n")
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redisCrnl = []byte("\r\n")
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redisEmptyArray = []byte("*0\r\n")
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redisQueued = []byte("+QUEUED\r\n")
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)
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type Connection struct {
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conn net.Conn
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db *leveldb.DB
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tx *leveldb.WriteBatch
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intArray []int
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}
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func NewConnection(conn net.Conn, db *leveldb.DB) *Connection {
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return &Connection{
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conn,
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db,
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nil,
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[]int{}}
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}
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func (c *Connection) Run() {
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defer c.conn.Close()
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rce := NewRedisCommandExecutor(c)
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r := bufio.NewReader(c.conn)
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parser := NewRedisParser(r, rce)
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parser.Parse()
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}
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func logError(err error) {
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log.Printf("ERROR: %s", err)
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}
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func (c *Connection) Hget(hash, key []byte) bool {
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log.Printf("client requested block: %q", key)
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var err error
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var data []byte
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ro := leveldb.NewReadOptions()
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defer ro.Close()
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if data, err = c.db.Get(ro, key); err != nil {
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logError(err)
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return c.writeError()
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}
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return c.writeBlock(data)
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}
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func (c *Connection) Hset(hash, key, block []byte) bool {
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log.Printf("client wants to store block: %q", key)
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var err error
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var exists int
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if exists, err = c.keyExists(key); err != nil {
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logError(err)
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return c.writeError()
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}
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if c.tx != nil {
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c.tx.Put(key, block)
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c.intArray = append(c.intArray, exists)
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return c.writeQueued()
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}
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wo := leveldb.NewWriteOptions()
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defer wo.Close()
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if err = c.db.Put(wo, key, block); err != nil {
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logError(err)
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return c.writeError()
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}
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return c.writeInteger(exists)
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}
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func (c *Connection) keyExists(key []byte) (exists int, err error) {
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ro := leveldb.NewReadOptions()
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defer ro.Close()
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var data []byte
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if data, err = c.db.Get(ro, key); err != nil {
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return
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}
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if data != nil {
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exists = 1
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} else {
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exists = 0
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}
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return
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}
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func (c *Connection) Multi() bool {
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if c.tx != nil {
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log.Println("WARN: Already running transaction.")
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} else {
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c.tx = leveldb.NewWriteBatch()
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}
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return c.writeOk()
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}
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func (c *Connection) Exec() bool {
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var err error
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if c.tx == nil {
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return c.writeEmptyArray()
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}
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tx := c.tx
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c.tx = nil
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defer tx.Close()
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arr := c.intArray
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c.intArray = []int{}
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wo := leveldb.NewWriteOptions()
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defer wo.Close()
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if err = c.db.Write(wo, tx); err != nil {
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logError(err)
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return c.writeError()
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}
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return c.writeIntegerArray(arr)
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}
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func (c *Connection) writeError() bool {
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if _, err := c.conn.Write(redisDbError); err != nil {
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logError(err)
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return false
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}
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return true
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}
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func (c *Connection) writeEmptyArray() bool {
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if _, err := c.conn.Write(redisDbError); err != nil {
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logError(err)
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return false
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}
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return true
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}
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func (c *Connection) writeInteger(v int) bool {
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if _, err := c.conn.Write([]byte(fmt.Sprintf(":%d\r\n", v))); err != nil {
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logError(err)
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return false
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}
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return true
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}
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func (c *Connection) writeIntegerArray(arr []int) bool {
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if _, err := c.conn.Write([]byte(fmt.Sprintf("*%d\r\n", len(arr)))); err != nil {
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logError(err)
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return false
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}
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for x := range arr {
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if !c.writeInteger(x) {
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return false
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}
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}
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return true
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}
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func (c *Connection) writeOk() bool {
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if _, err := c.conn.Write(redisOk); err != nil {
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logError(err)
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return false
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}
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return true
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}
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func (c *Connection) writeQueued() bool {
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if _, err := c.conn.Write(redisQueued); err != nil {
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logError(err)
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return false
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}
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return true
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}
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func (c *Connection) writeBlock(data []byte) bool {
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if err := c.writeBulkString(data); err != nil {
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logError(err)
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return false
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}
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return true
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}
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func (c *Connection) writeBulkString(data []byte) (err error) {
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con := c.conn
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if data == nil {
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_, err = con.Write(redisNoSuchBlock)
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} else {
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if _, err = con.Write([]byte(fmt.Sprintf("$%d\r\n", len(data)))); err != nil {
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return
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}
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if _, err = con.Write(data); err != nil {
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return
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}
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_, err = con.Write(redisCrnl)
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}
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return
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}
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194
main.go
194
main.go
@ -1,7 +1,6 @@
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package main
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import (
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"bufio"
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"flag"
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"fmt"
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"log"
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@ -12,197 +11,6 @@ import (
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leveldb "github.com/jmhodges/levigo"
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)
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type connection struct {
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conn net.Conn
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db *leveldb.DB
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tx *leveldb.WriteBatch
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intArray []int
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}
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func newConnection(conn net.Conn, db *leveldb.DB) *connection {
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return &connection{
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conn,
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db,
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nil,
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[]int{}}
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}
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func (c *connection) run() {
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defer c.conn.Close()
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rce := NewRedisCommandExecutor(c)
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r := bufio.NewReader(c.conn)
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parser := NewRedisParser(r, rce)
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parser.Parse()
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}
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func (c *connection) Hget(hash, key []byte) bool {
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log.Printf("client requested block: %q", key)
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var err error
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var data []byte
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ro := leveldb.NewReadOptions()
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defer ro.Close()
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if data, err = c.db.Get(ro, key); err != nil {
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log.Printf("Something is wrong with db: %s", err)
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return c.writeError()
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}
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return c.writeBlock(data)
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}
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func (c *connection) Hset(hash, key, block []byte) bool {
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log.Printf("client wants to store block: %q", key)
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var err error
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var exists int
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if exists, err = c.keyExists(key); err != nil {
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log.Printf("Something is wrong with db: %s", err)
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return c.writeError()
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}
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if c.tx != nil {
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c.tx.Put(key, block)
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c.intArray = append(c.intArray, exists)
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return c.writeQueued()
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}
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wo := leveldb.NewWriteOptions()
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defer wo.Close()
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if err = c.db.Put(wo, key, block); err != nil {
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log.Printf("Something is wrong with db: %s", err)
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return c.writeError()
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}
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return c.writeInteger(exists)
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}
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func (c *connection) keyExists(key []byte) (exists int, err error) {
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ro := leveldb.NewReadOptions()
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defer ro.Close()
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var data []byte
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if data, err = c.db.Get(ro, key); err != nil {
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return
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}
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if data != nil {
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exists = 1
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} else {
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exists = 0
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}
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return
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}
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func (c *connection) Multi() bool {
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if c.tx != nil {
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log.Println("WARN: Already running transaction.")
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} else {
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c.tx = leveldb.NewWriteBatch()
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}
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return c.writeOk()
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}
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func (c *connection) Exec() bool {
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var err error
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if c.tx == nil {
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return c.writeEmptyArray()
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}
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tx := c.tx
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c.tx = nil
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defer tx.Close()
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arr := c.intArray
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c.intArray = []int{}
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wo := leveldb.NewWriteOptions()
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defer wo.Close()
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if err = c.db.Write(wo, tx); err != nil {
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log.Printf("Something went wrong in writing transaction: %s", err)
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return c.writeError()
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}
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return c.writeIntegerArray(arr)
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}
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var (
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redisOk = []byte("+OK\r\n")
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redisDbError = []byte("-FAIL\r\n")
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redisNoSuchBlock = []byte("$-1\r\n")
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redisCrnl = []byte("\r\n")
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redisEmptyArray = []byte("*0\r\n")
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redisQueued = []byte("+QUEUED\r\n")
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)
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func (c *connection) writeError() bool {
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if _, err := c.conn.Write(redisDbError); err != nil {
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log.Printf("Something went wrong writing to client %s", err)
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return false
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}
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return true
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}
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func (c *connection) writeEmptyArray() bool {
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if _, err := c.conn.Write(redisDbError); err != nil {
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log.Printf("Writing message to client failed: %s", err)
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return false
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}
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return true
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}
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func (c *connection) writeInteger(v int) bool {
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if _, err := c.conn.Write([]byte(fmt.Sprintf(":%d\r\n", v))); err != nil {
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log.Printf("Writing message to client failed: %s", err)
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return false
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}
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return true
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}
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func (c *connection) writeIntegerArray(arr []int) bool {
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if _, err := c.conn.Write([]byte(fmt.Sprintf("*%d\r\n", len(arr)))); err != nil {
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log.Printf("Writing message to client failed: %s", err)
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return false
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}
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for x := range arr {
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if !c.writeInteger(x) {
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return false
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}
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}
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return true
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}
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func (c *connection) writeOk() bool {
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if _, err := c.conn.Write(redisOk); err != nil {
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log.Printf("Something went wrong writing to client %s", err)
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return false
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}
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return true
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}
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func (c *connection) writeQueued() bool {
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if _, err := c.conn.Write(redisQueued); err != nil {
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log.Printf("Something went wrong writing to client %s", err)
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return false
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}
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return true
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}
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func (c *connection) writeBlock(data []byte) bool {
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if err := c.writeBulkString(data); err != nil {
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log.Printf("Something went wrong writing to client %s", err)
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return false
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}
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return true
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}
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func (c *connection) writeBulkString(data []byte) (err error) {
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con := c.conn
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if data == nil {
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_, err = con.Write(redisNoSuchBlock)
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} else {
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if _, err = con.Write([]byte(fmt.Sprintf("$%d\r\n", len(data)))); err != nil {
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return
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}
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if _, err = con.Write(data); err != nil {
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return
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}
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_, err = con.Write(redisCrnl)
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}
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return
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}
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func main() {
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var port int
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@ -263,7 +71,7 @@ func main() {
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for {
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select {
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case conn := <-connChan:
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go newConnection(conn, db).run()
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go NewConnection(conn, db).Run()
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case <-sigChan:
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log.Println("Shutting down")
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return
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