1 files changed, 101 insertions, 0 deletions
diff --git a/protocol.go b/protocol.go
new file mode 100644
index 0000000..b2a4cb6
--- /dev/null
+++ b/protocol.go
@@ -0,0 +1,101 @@
+package main
+
+// postmap -v 'user' /path/to.socket
+
+import (
+	"encoding"
+	"errors"
+	"fmt"
+	"io"
+	"strings"
+)
+
+// Postfix request.
+type Request struct {
+	Name string
+	Key  string
+}
+
+func (s *Request) UnmarshalText(buf []byte) error {
+	strs := strings.SplitN(string(buf), " ", 2)
+	if len(strs) > 0 {
+		s.Name = strs[0]
+	}
+	if len(strs) > 1 {
+		s.Key = strs[1]
+	}
+	if len(strs) > 2 {
+		return fmt.Errorf("bad format")
+	}
+
+	return nil
+}
+
+func (s *Request) String() string {
+	return fmt.Sprintf("%s %s", s.Name, s.Key)
+}
+
+// Value found.
+type ReplyOK struct {
+	Data string
+}
+
+func (s *ReplyOK) String() string {
+	return fmt.Sprintf("OK %s", s.Data)
+}
+
+// Value not found.
+type ReplyNotFound struct{}
+
+func (s *ReplyNotFound) String() string {
+	return "NOTFOUND "
+}
+
+// Something happened..
+type ReplyPerm struct {
+	Reason string
+}
+
+func (s *ReplyPerm) String() string {
+	return fmt.Sprintf("PERM %s", s.Reason)
+}
+
+func readNetString(r io.Reader, v encoding.TextUnmarshaler) (int, error) {
+	var strLen int
+
+	bytesRead, err := fmt.Fscanf(r, "%d:", &strLen)
+	if err != nil {
+		return bytesRead, err
+	}
+
+	payload := make([]byte, strLen)
+	n, err := r.Read(payload)
+	if err != nil {
+		return bytesRead, err
+	}
+	bytesRead += n
+
+	buf := make([]byte, 1)
+	n, err = r.Read(buf)
+	bytesRead += n
+	if err != nil {
+		return bytesRead, err
+	}
+
+	if buf[0] != ',' {
+		return bytesRead, errors.New("bad format")
+	}
+
+	err = v.UnmarshalText(payload)
+	if err != nil {
+		return bytesRead, err
+	}
+
+	return bytesRead, nil
+}
+
+func writeNetString(w io.Writer, v fmt.Stringer) (int, error) {
+	str := v.String()
+	resp := fmt.Sprintf("%d:%s,", len(str), str)
+	return w.Write([]byte(resp))
+}