feat: string cmd setbit (#69)

* feat: string cmd setbit

* solving format error

* solving format

* fix build error

src/base_cmd.h

@@ -37,6 +37,7 @@ const std::string kCmdNameIncrby = "incrby";
 const std::string kCmdNameDecrby = "decrby";
 const std::string kCmdNameIncrbyFloat = "incrbyfloat";
 const std::string kCmdNameStrlen = "strlen";
+const std::string kCmdNameSetBit = "setbit";
 const std::string kCmdNameSetEx = "setex";
 const std::string kCmdNamePSetEx = "psetex";
 const std::string kCmdNameBitOp = "bitop";

src/cmd_kv.cc

@@ -604,4 +604,67 @@ void GetBitCmd::DoCmd(PClient* client) {
   return;
 }
 
+SetBitCmd::SetBitCmd(const std::string& name, int16_t arity)
+    : BaseCmd(name, arity, kCmdFlagsWrite, kAclCategoryWrite | kAclCategoryString) {}
+
+bool SetBitCmd::DoInitial(PClient* client) {
+  client->SetKey(client->argv_[1]);
+  return true;
+}
+
+void SetBitCmd::DoCmd(PClient* client) {
+  PObject* value = nullptr;
+  PError err = PSTORE.GetValueByType(client->Key(), value, kPTypeString);
+  if (err == kPErrorNotExist) {
+    value = PSTORE.SetValue(client->Key(), PObject::CreateString(""));
+    err = kPErrorOK;
+  }
+
+  if (err != kPErrorOK) {
+    client->AppendInteger(0);
+    return;
+  }
+
+  long offset = 0;
+  long on = 0;
+  if (!Strtol(client->argv_[2].c_str(), client->argv_[2].size(), &offset) ||
+      !Strtol(client->argv_[3].c_str(), client->argv_[3].size(), &on)) {
+    client->SetRes(CmdRes::kInvalidInt);
+    return;
+  }
+
+  if (offset < 0 || offset > kStringMaxBytes) {
+    client->AppendInteger(0);
+    return;
+  }
+
+  PString* pStringPtr = value->CastString();
+  if (!pStringPtr) {
+    client->AppendInteger(0);
+    return;
+  }
+
+  PString& newVal = *pStringPtr;
+
+  size_t bytes = offset / 8;
+  size_t bits = offset % 8;
+
+  if (bytes + 1 > newVal.size()) {
+    newVal.resize(bytes + 1, '\0');
+  }
+
+  const char oldByte = newVal[bytes];
+  char& byte = newVal[bytes];
+  if (on) {
+    byte |= (0x1 << bits);
+  } else {
+    byte &= ~(0x1 << bits);
+  }
+
+  value->Reset(new PString(newVal));
+  value->encoding = kPEncodeRaw;
+  client->AppendInteger((oldByte & (0x1 << bits)) ? 1 : 0);
+  return;
+}
+
 }  // namespace pikiwidb

src/cmd_kv.h

@@ -181,6 +181,17 @@ class DecrbyCmd : public BaseCmd {
   void DoCmd(PClient *client) override;
 };
 
+class SetBitCmd : public BaseCmd {
+ public:
+  SetBitCmd(const std::string &name, int16_t arity);
+
+ protected:
+  bool DoInitial(PClient *client) override;
+
+ private:
+  void DoCmd(PClient *client) override;
+};
+
 class GetBitCmd : public BaseCmd {
  public:
   GetBitCmd(const std::string &name, int16_t arity);

src/cmd_table_manager.cc

@@ -59,6 +59,7 @@ void CmdTableManager::InitCmdTable() {
   ADD_COMMAND(BitOp, -4);
   ADD_COMMAND(BitCount, -2);
   ADD_COMMAND(GetBit, 3);
+  ADD_COMMAND(SetBit, 4);
 
   // hash
   ADD_COMMAND(HSet, -4);