fix: write-buffer-size overflow (#3185)

* 修复v3.5.5版本中write-buffer-size溢出问题

---------

Co-authored-by: zhouguanghan <zhouguanghan@wredis41.add.zzdt.qihoo.net>

Author: Z-G-H1

include/pika_conf.h

@@ -680,7 +680,7 @@ class PikaConf : public pstd::BaseConf {
     TryPushDiffCommands("max-background-jobs", std::to_string(value));
     max_background_jobs_ = value;
   }
-  void SetWriteBufferSize(const int& value) {
+  void SetWriteBufferSize(int64_t value) {
     std::lock_guard l(rwlock_);
     TryPushDiffCommands("write-buffer-size", std::to_string(value));
     write_buffer_size_ = value;

src/pika_admin.cc

@@ -2731,7 +2731,7 @@ void ConfigCmd::ConfigSet(std::shared_ptr<DB> db) {
       res_.AppendStringRaw("-ERR Set write-buffer-size wrong: " + s.ToString() + "\r\n");
       return;
     }
-    g_pika_conf->SetWriteBufferSize(static_cast<int>(ival));
+    g_pika_conf->SetWriteBufferSize(ival);
     res_.AppendStringRaw("+OK\r\n");
   } else if (set_item == "max-write-buffer-num") {
     if (pstd::string2int(value.data(), value.size(), &ival) == 0) {

tests/integration/server_test.go

@@ -329,6 +329,18 @@ var _ = Describe("Server", func() {
 			Expect(r.Val()).To(Equal("OK"))
 		})
 
+		It("should ConfigSet write-buffer-size large value", func() {
+			// Test for fix: when setting write-buffer-size value larger than 2147483647,
+			// the value should not become negative
+			configSet := client.ConfigSet(ctx, "write-buffer-size", "3000000000")
+			Expect(configSet.Err()).NotTo(HaveOccurred())
+			Expect(configSet.Val()).To(Equal("OK"))
+			
+			configGet := client.ConfigGet(ctx, "write-buffer-size")
+			Expect(configGet.Err()).NotTo(HaveOccurred())
+			Expect(configGet.Val()).To(Equal(map[string]string{"write-buffer-size": "3000000000"}))
+		})
+
 		It("should ConfigSet maxmemory", func() {
 			configGet := client.ConfigGet(ctx, "maxmemory")
 			Expect(configGet.Err()).NotTo(HaveOccurred())