commit of code

db.go

@@ -0,0 +1,48 @@
+package kvrepl
+
+import "fmt"
+
+type DB struct {
+	KV1  map[string]string
+	KV2  map[string]string
+	PKV  bool
+	nest int
+}
+
+func read(args []string, kv map[string]string) (string, error) {
+	if len(args) != 1 {
+		return "", fmt.Errorf("incorrect usage: READ <key>")
+	}
+	i, ok := kv[args[0]]
+	if !ok {
+		return "", fmt.Errorf("key does not exist")
+	}
+	return i, nil
+}
+
+func write(args []string, kv map[string]string) error {
+	if len(args) != 2 {
+		return fmt.Errorf("incorrect usage: WRITE <key> <value>")
+	}
+	kv[args[0]] = args[1]
+	return nil
+}
+
+func del(args []string, kv map[string]string) error {
+	if len(args) != 1 {
+		return fmt.Errorf("incorrect usage: DELETE <key>")
+	}
+	_, ok := kv[args[0]]
+	if !ok {
+		return fmt.Errorf("key does not exist")
+	}
+	delete(kv, args[0])
+	return nil
+}
+
+func whichDB(d *DB) map[string]string {
+	if d.PKV {
+		return d.KV1
+	}
+	return d.KV2
+}