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client.go
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client.go
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package goSam
import (
"bufio"
"fmt"
"net"
"github.com/cryptix/go/debug"
)
// ConnDebug if set to true, Sam connections are wrapped with logging
var ConnDebug = false
// A Client represents a single Connection to the SAM bridge
type Client struct {
SamConn net.Conn
rd *bufio.Reader
}
// NewDefaultClient creates a new client, connecting to the default host:port at localhost:7656
func NewDefaultClient() (*Client, error) {
return NewClient("localhost:7656")
}
// NewClient creates a new client, connecting to a specified port
func NewClient(addr string) (*Client, error) {
conn, err := net.Dial("tcp", addr)
if err != nil {
return nil, err
}
if ConnDebug {
conn = debug.WrapConn(conn)
}
c := &Client{
SamConn: conn,
rd: bufio.NewReader(conn),
}
return c, c.hello()
}
// send the initial handshake command and check that the reply is ok
func (c *Client) hello() error {
r, err := c.sendCmd("HELLO VERSION MIN=3.0 MAX=3.0\n")
if err != nil {
return err
}
if r.Topic != "HELLO" {
return fmt.Errorf("Unknown Reply: %+v\n", r)
}
if r.Pairs["RESULT"] != "OK" || r.Pairs["VERSION"] != "3.0" {
return fmt.Errorf("Handshake did not succeed\nReply:%+v\n", r)
}
return nil
}
// helper to send one command and parse the reply by sam
func (c *Client) sendCmd(str string, args ...interface{}) (*Reply, error) {
if _, err := fmt.Fprintf(c.SamConn, str, args...); err != nil {
return nil, err
}
line, err := c.rd.ReadString('\n')
if err != nil {
return nil, err
}
return parseReply(line)
}
// Close the underlying socket to SAM
func (c *Client) Close() error {
c.rd = nil
return c.SamConn.Close()
}