Feature: add redis_lpop_count command

Author: yujun411522

trpc/client/redis/cmdgen.h

@@ -782,6 +782,10 @@ class cmdgen {
 
   std::string lpop(const std::string& key) { return BinaryCmdPacket(__func__, key); }
 
+  // Starting with Redis version 6.2.0: Added the count argument.
+  // More about https://redis.io/commands/lpop/
+  std::string lpop(const std::string& key, int count) { return TernaryCmdPacket(__func__, key, std::to_string(count)); }
+
   std::string lpush(const std::string& key, const std::vector<std::string>& elements) {
     return TernaryCmdPacket(__func__, key, elements);
   }

trpc/client/redis/cmdgen_test.cc

@@ -402,6 +402,7 @@ TEST(CmdgenTest, lists) {
       trpc::redis::cmdgen{}.linsert("mykey1", "mykey2", "mykey3", "mykey4"));
   EXPECT_EQ("*2\r\n$4\r\nllen\r\n$6\r\nmykey1\r\n", trpc::redis::cmdgen{}.llen("mykey1"));
   EXPECT_EQ("*2\r\n$4\r\nlpop\r\n$6\r\nmykey1\r\n", trpc::redis::cmdgen{}.lpop("mykey1"));
+  EXPECT_EQ("*3\r\n$4\r\nlpop\r\n$6\r\nmykey1\r\n$2\r\n10\r\n", trpc::redis::cmdgen{}.lpop("mykey1", 10));
   EXPECT_EQ("*5\r\n$5\r\nlpush\r\n$6\r\nmykey1\r\n$4\r\nkey1\r\n$4\r\nkey2\r\n$4\r\nkey3\r\n",
             trpc::redis::cmdgen{}.lpush("mykey1", keys));
   EXPECT_EQ("*5\r\n$6\r\nlpushx\r\n$6\r\nmykey1\r\n$4\r\nkey1\r\n$4\r\nkey2\r\n$4\r\nkey3\r\n",