From 01cb269a5129f2ac98385ae041ce2a447a09b598 Mon Sep 17 00:00:00 2001
From: James Mills <1290234+prologic@users.noreply.github.com>
Date: Thu, 21 Mar 2019 10:29:18 +1000
Subject: [PATCH] Add EXISTS command to server (bitraftd)

---
 cmd/bitcaskd/main.go | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/cmd/bitcaskd/main.go b/cmd/bitcaskd/main.go
index 4a79d34..6fc0a5a 100644
--- a/cmd/bitcaskd/main.go
+++ b/cmd/bitcaskd/main.go
@@ -96,6 +96,17 @@ func main() {
 				} else {
 					conn.WriteBulk(value)
 				}
+			case "exists":
+				if len(cmd.Args) != 2 {
+					conn.WriteError("ERR wrong number of arguments for '" + string(cmd.Args[0]) + "' command")
+					return
+				}
+				key := string(cmd.Args[1])
+				if db.Has(key) {
+					conn.WriteInt(1)
+				} else {
+					conn.WriteInt(0)
+				}
 			case "del":
 				if len(cmd.Args) != 2 {
 					conn.WriteError("ERR wrong number of arguments for '" + string(cmd.Args[0]) + "' command")