client: Added support for querying the server version.

diff --git a/client/client.go b/client/client.go
index fcb5d8de2f6c2d88fec581d868550c0c84e2d684..c42c7173793bacbd53a3a08eef1ddd108de97b6e 100644 (file)
--- a/client/client.go
+++ b/client/client.go
@@ -57,6 +57,7 @@ server:
 package client
 
 import (
+       "encoding/binary"
        "fmt"
        "net"
        "strings"
@@ -187,4 +188,31 @@ func (c *Conn) Receive() (*proto.Message, error) {
        return nil, err
 }
 
+// ServerVersion queries and returns the version of the remote server.
+func (c *Conn) ServerVersion() (major, minor, patch int, extra string, err error) {
+       m := &proto.Message{Type: proto.ConnectionServerVersion}
+       if err = c.Send(m); err != nil {
+               return 0, 0, 0, "", err
+       }
+
+       m, err = c.Receive()
+       if err != nil || m.Type != proto.ConnectionOK {
+               if err == nil {
+                       err = fmt.Errorf("SERVER_VERSION command failed with status %d", m.Type)
+               }
+               return 0, 0, 0, "", err
+       }
+       if len(m.Raw) < 4 {
+               return 0, 0, 0, "", fmt.Errorf("SERVER_VERSION reply is too short")
+       }
+       version := int(binary.BigEndian.Uint32(m.Raw[:4]))
+       major = version / 10000
+       minor = version/100 - 100*major
+       patch = version - 10000*major - 100*minor
+       if len(m.Raw) > 4 {
+               extra = string(m.Raw[4:])
+       }
+       return major, minor, patch, extra, nil
+}
+
 // vim: set tw=78 sw=4 sw=4 noexpandtab :

diff --git a/proto/proto.go b/proto/proto.go
index 5e93e472adbdb53c50c9bb0b10061dfeabec2419..a58725d6f81a6c7ad451390974e311b63a08b0f7 100644 (file)
--- a/proto/proto.go
+++ b/proto/proto.go
@@ -84,6 +84,9 @@ const (
        ConnectionMatcher = Status(100)
        // ConnectionExpr is the internal state for parsing expressions.
        ConnectionExpr = Status(101)
+
+       // ConnectionServerVersion is the state requesting the server version.
+       ConnectionServerVersion = Status(1000)
 )
 
 // The DataType describes the type of data in a ConnectionData message.