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server_handler.go
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121 lines (88 loc) · 2.16 KB
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package tcp
import (
"bufio"
"io"
"log"
"net"
)
func (server *Server) readKey(reader *bufio.Reader) (string, error) {
keyLength, err := readLength(reader)
if err != nil {
return "", err
}
key := make([]byte, keyLength)
_, err = io.ReadFull(reader, key)
if err != nil {
return "", err
}
return string(key), nil
}
func (server *Server) readKeyAndValue(reader *bufio.Reader) (string, []byte, error) {
keyLength, err := readLength(reader)
if err != nil {
return "", nil, err
}
valueLength, err := readLength(reader)
if err != nil {
return "", nil, err
}
key := make([]byte, keyLength)
_, err = io.ReadFull(reader, key)
if err != nil {
return "", nil, err
}
value := make([]byte, valueLength)
_, err = io.ReadFull(reader, value)
if err != nil {
return "", nil, err
}
return string(key), value, nil
}
func (server *Server) get(connection net.Conn, reader *bufio.Reader) error {
key, err := server.readKey(reader)
if err != nil {
return err
}
value, err := server.cache.Get(key)
return sendResponse(value, err, connection)
}
func (server *Server) set(connection net.Conn, reader *bufio.Reader) error {
key, value, err := server.readKeyAndValue(reader)
if err != nil {
return err
}
return sendResponse(nil, server.cache.Set(key, value), connection)
}
func (server *Server) delete(connection net.Conn, reader *bufio.Reader) error {
key, err := server.readKey(reader)
if err != nil {
return err
}
return sendResponse(nil, server.cache.Delete(key), connection)
}
func (server *Server) process(connection net.Conn) {
defer connection.Close()
reader := bufio.NewReader(connection)
for {
operation, err := reader.ReadByte()
if err != nil {
if err != io.EOF {
log.Println("Close connection due to error:", err)
}
return
}
if operation == 'S' {
err = server.set(connection, reader)
} else if operation == 'G' {
err = server.get(connection, reader)
} else if operation == 'D' {
err = server.delete(connection, reader)
} else {
log.Println("Close connection due to invalid operation:", operation)
}
if err != nil {
log.Println("Close connection due to error:", err)
return
}
}
}