f-25: qmp add interaction lib

Signed-off-by: GnomeZworc <nicolas.boufidjeline@g3e.fr>

internal/qmp/send.go

@@ -0,0 +1,50 @@
+package qmp
+
+import (
+	"bufio"
+	"encoding/json"
+	"fmt"
+	"net"
+	"strings"
+)
+
+func Send(socketPath string, commands []string) ([]json.RawMessage, error) {
+	conn, err := net.Dial("unix", socketPath)
+	if err != nil {
+		return nil, fmt.Errorf("qmp dial: %w", err)
+	}
+	defer conn.Close()
+
+	r := bufio.NewReader(conn)
+
+	if _, err := r.ReadString('\n'); err != nil {
+		return nil, fmt.Errorf("qmp read greeting: %w", err)
+	}
+
+	var sb strings.Builder
+	sb.WriteString(`{ "execute": "qmp_capabilities" }`)
+	for _, cmd := range commands {
+		sb.WriteByte('\n')
+		sb.WriteString(cmd)
+	}
+	sb.WriteByte('\n')
+
+	if _, err := fmt.Fprint(conn, sb.String()); err != nil {
+		return nil, fmt.Errorf("qmp write: %w", err)
+	}
+
+	if _, err := r.ReadString('\n'); err != nil {
+		return nil, fmt.Errorf("qmp read capabilities response: %w", err)
+	}
+
+	var results []json.RawMessage
+	for range commands {
+		line, err := r.ReadString('\n')
+		if err != nil {
+			return nil, fmt.Errorf("qmp read response: %w", err)
+		}
+		results = append(results, json.RawMessage(line))
+	}
+
+	return results, nil
+}