commit of code

parse.go

@@ -0,0 +1,59 @@
+package kvrepl
+
+import (
+	"fmt"
+	"os"
+	"strings"
+)
+
+func Parse(s string, d *DB) (string, error) {
+	args := strings.Split(s, " ")
+
+	switch strings.ToLower(args[0]) {
+	case "read":
+		return read(args[1:], whichDB(d))
+	case "write":
+		return "", write(args[1:], whichDB(d))
+	case "delete":
+		return "", del(args[1:], whichDB(d))
+	case "start":
+		if len(args) != 1 {
+			return "", fmt.Errorf("incorrect usage: START")
+		}
+		d.nest++
+		d.PKV = false
+
+		// copy contents of KV1 to KV2
+		d.KV2 = make(map[string]string)
+		for k, v := range d.KV1 {
+			d.KV2[k] = v
+		}
+	case "commit":
+		if len(args) != 1 {
+			return "", fmt.Errorf("incorrect usage: COMMIT")
+		}
+		if d.PKV {
+			return "", fmt.Errorf("not in a transaction")
+		}
+		if d.nest == 0 {
+			d.PKV = true
+			// copy contents of KV2 to KV1
+			d.KV1 = make(map[string]string)
+			for k, v := range d.KV2 {
+				d.KV1[k] = v
+			}
+		}
+
+	case "abort":
+		if len(args) != 1 {
+			return "", fmt.Errorf("incorrect usage: ABORT")
+		}
+		d.PKV = true
+	case "quit":
+		fmt.Println("goodbye")
+		os.Exit(0)
+	default:
+		fmt.Println("not known command")
+	}
+	return "", nil
+}