src/pika_admin.cc (2)

3390-3392: Consider storing the version string once, rather than declaring and formatting multiple times.
Currently, the version string is formatted here and then reformatted at line 3398 with the same data. Eliminating repetition could make the code more maintainable and less error-prone.

---

3398-3398: Avoid redundant version formatting.
This line repeats the exact snprintf call performed at line 3391. Refactor to reuse the previously assigned version string to avoid potential inconsistencies and duplication.

   // Remove the repeated snprintf if version is already set
-  snprintf(version, sizeof(version), "%d.%d.%d", PIKA_MAJOR, PIKA_MINOR, PIKA_PATCH);

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src/pika_admin.cc (1)

Line range hint 3408-3419: Improve error handling for unknown roles.

The default case for role handling only logs the error but continues execution. Consider returning an error response to the client.

    default:
      LOG(INFO) << "unknown role" << host_role << " client ip:port " << conn->ip_port();
-     return;
+     res_.SetRes(CmdRes::kErrOther, "Internal error: unknown server role");
+     return;

src/pika_admin.cc (5)

3390-3392: Consider using a version constant or config value.

The version string is constructed using hardcoded version numbers. Consider using version constants or configuration values for better maintainability.

- snprintf(version, sizeof(version), "%d.%d.%d", PIKA_MAJOR, PIKA_MINOR, PIKA_PATCH);
+ const std::string version = GetVersionString(); // Use a helper function that reads from constants/config

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3395-3396: Fix indentation for consistency.

The field-value pairs have inconsistent indentation.

  std::vector<storage::FieldValue> fvs{
      {"server", "redis"},
-     {"version", version}
+      {"version", version}
  };

---

Line range hint 3475-3481: Add unit documentation for disk space check.

The disk space comparison uses bytes but the error message doesn't specify units. Consider adding unit information for clarity.

  uint64_t free_size = disk_info.f_bsize * disk_info.f_bfree;
  if (free_size < least_free_size) {
-   res_.SetRes(CmdRes::kErrOther, "The available disk capacity is insufficient");
+   res_.SetRes(CmdRes::kErrOther, 
+               "The available disk capacity is insufficient. Required: " + 
+               std::to_string(least_free_size/1024/1024) + "MB, Available: " + 
+               std::to_string(free_size/1024/1024) + "MB");
    return;
  }

---

Line range hint 3482-3499: Consider refactoring background error handling for better readability.

The background error handling logic could be extracted into a separate method for better readability and reusability.

+ bool HandleBackgroundErrors(const std::shared_ptr<DB>& db) {
+   std::map<int, uint64_t> background_errors;
+   db->DBLockShared();
+   db->storage()->GetUsage(storage::PROPERTY_TYPE_ROCKSDB_BACKGROUND_ERRORS, &background_errors);
+   db->DBUnlockShared();
+   
+   for (const auto& item : background_errors) {
+     if (item.second != 0) {
+       rocksdb::Status s = db->storage()->GetDBByIndex(item.first)->Resume();
+       if (!s.ok()) {
+         return false;
+       }
+     }
+   }
+   return true;
+ }

  // In Do() method:
  for (const auto& db_item : g_pika_server->GetDB()) {
    if (!db_item.second) {
      continue; 
    }
    db_item.second->SetBinlogIoErrorrelieve();
-   background_errors_.clear();
-   db_item.second->DBLockShared();
-   db_item.second->storage()->GetUsage(storage::PROPERTY_TYPE_ROCKSDB_BACKGROUND_ERRORS, &background_errors_);
-   db_item.second->DBUnlockShared();
-   for (const auto& item : background_errors_) {
-     if (item.second != 0) {
-       rocksdb::Status s = db_item.second->storage()->GetDBByIndex(item.first)->Resume();
-       if (!s.ok()) {
-         res_.SetRes(CmdRes::kErrOther, "The restore operation failed.");
-       }
-     }
-   }
+   if (!HandleBackgroundErrors(db_item.second)) {
+     res_.SetRes(CmdRes::kErrOther, "The restore operation failed for DB: " + db_item.first);
+     return;
+   }
  }

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Line range hint 3644-3677: Improve error handling and messages in CacheCmd.

The error handling could be improved with more specific error messages and better default case handling.

  switch (condition_) {
    case kCLEAR_DB:
      g_pika_server->ClearCacheDbAsync(db_);
      res_.SetRes(CmdRes::kOk);
      break;
    case kCLEAR_HITRATIO:
      g_pika_server->ClearHitRatio(db_);
      res_.SetRes(CmdRes::kOk);
      break;
    case kDEL_KEYS:
      db_->cache()->Del(keys_);
      res_.SetRes(CmdRes::kOk);
      break;
    case kRANDOM_KEY:
      s_ = db_->cache()->RandomKey(&key);
      if (!s_.ok()) {
-       res_.AppendStringLen(-1);
+       res_.SetRes(CmdRes::kErrOther, "Failed to get random key: " + s_.ToString());
      } else {
        res_.AppendStringLen(key.size());
        res_.AppendContent(key);
      }
      break;
    default:
-     res_.SetRes(CmdRes::kErrOther, "Unknown cmd");
+     res_.SetRes(CmdRes::kErrOther, "Unknown cache operation");
      break;
  }

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