HTTP APIs : SHOW QUERY, SHOW TRANSACTIONS, SHOW TRANSACTION (#2007)

### What problem does this PR solve?

New HTTP APIs of:

- SHOW QUERY {QUERY_ID} (not documented)
- SHOW TRANSACTIONS
- SHOW TRANSACTION

Issue link: #1937 

### Type of change

- [x] New Feature (non-breaking change which adds functionality)
- [x] Documentation Update

---------

Signed-off-by: vsian <[email protected]>

Author: vsian

docs/references/http_api_reference.mdx

@@ -2635,7 +2635,150 @@ A `500` HTTP status code indicates an error condition. The response includes a J
 
 ---
 
+## Show transactions
 
+**GET** `/instance/transactions`
+
+Shows running transactions on database.
+
+### Request
+
+- Method: GET
+- URL: `/instance/transactions`
+- Headers: `accept: application/json`
+
+#### Request example
+
+```shell
+curl --request GET \
+     --url http://localhost:23820/instance/transactions \
+     --header 'accept: application/json'
+```
+
+### Response
+
+<Tabs
+  defaultValue="s200"
+  values={[
+    {label: 'Status code 200', value: 's200'},
+    {label: 'Status code 500', value: 's500'},
+  ]}>
+  <TabItem value="s200">
+
+The response includes a JSON object like the following:
+
+```shell
+{
+    "error_code":0,
+    "transactions": [
+        {
+            "transaction_id":"27275",
+            "transaction_text":""
+        },
+        {
+            "transaction_id":"27274",
+            "transaction_text":""
+        }
+    ]
+}
+```
+
+- `"error_code"`: `integer`
+  `0`: The operation succeeds.
+
+</TabItem>
+  <TabItem value="s500">
+
+A `500` HTTP status code indicates an error condition. The response includes a JSON object like the following:
+
+```shell
+{
+    "error_code": 2005,
+    "error_message": "Not support in maintenance mode"
+}
+```
+
+- `"error_code"`: `integer`
+  A non-zero value indicates a specific error condition.
+- `"error_message"`: `string`
+  When `error_code` is non-zero, `"error_message"` provides additional details about the error.
+
+</TabItem>
+</Tabs>
+
+---
+
+## Show transaction
+
+**GET** `/instance/transactions/{trasaction_id}`
+
+Shows running transactions on database by transaction_id.
+
+### Request
+
+- Method: GET
+- URL: `/instance/transactions`
+- Headers: `accept: application/json`
+
+#### Request example
+
+```shell
+curl --request GET \
+     --url http://localhost:23820/instance/transactions/{transaction_id} \
+     --header 'accept: application/json'
+```
+
+#### Request parameters
+
+- `transaction_id`: (*Path parameter*)
+  The id of the running transaction.
+
+### Response
+
+<Tabs
+  defaultValue="s200"
+  values={[
+    {label: 'Status code 200', value: 's200'},
+    {label: 'Status code 500', value: 's500'},
+  ]}>
+  <TabItem value="s200">
+
+The response includes a JSON object like the following:
+
+```shell
+{
+    "error_code":0,
+    "transaction": {
+        "transaction_id":"27275",
+        "transaction_text":""
+    }
+}
+```
+
+- `"error_code"`: `integer`
+  `0`: The operation succeeds.
+
+</TabItem>
+  <TabItem value="s500">
+
+A `500` HTTP status code indicates an error condition. The response includes a JSON object like the following:
+
+```shell
+{
+    "error_code": 2005,
+    "error_message": "Not support in maintenance mode"
+}
+```
+
+- `"error_code"`: `integer`
+  A non-zero value indicates a specific error condition.
+- `"error_message"`: `string`
+  When `error_code` is non-zero, `"error_message"` provides additional details about the error.
+
+</TabItem>
+</Tabs>
+
+---
 
 ## Admin set node role
 

src/network/http_server.cpp

@@ -3590,6 +3590,116 @@ class ShowFullCheckpointHandler final : public HttpRequestHandler {
     }
 };
 
+
+class ShowQueryHandler final : public HttpRequestHandler {
+public:
+SharedPtr<OutgoingResponse> handle(const SharedPtr<IncomingRequest> &request) final {
+        auto infinity = Infinity::RemoteConnect();
+        DeferFn defer_fn([&]() { infinity->RemoteDisconnect(); });
+
+        nlohmann::json json_response;
+        nlohmann::json json_table;
+        HTTPStatus http_status;
+        String query_id = request->getPathVariable("query_id");
+        QueryResult result = infinity->Query(fmt::format("show query {}", query_id)); 
+
+        if (result.IsOk()) {
+            DataBlock *data_block = result.result_table_->GetDataBlockById(0).get();
+            auto column_cnt = result.result_table_->ColumnCount();
+            for (SizeT col = 0; col < column_cnt; ++col) {
+                const String &column_name = result.result_table_->GetColumnNameById(col);
+                Value value = data_block->GetValue(col, 0);
+                const String &column_value = value.ToString();
+                json_table[column_name] = column_value;
+            }
+            json_response["query"] = json_table;
+            json_response["error_code"] = 0;
+            http_status = HTTPStatus::CODE_200;
+        } else {
+            json_response["error_code"] = result.ErrorCode();
+            json_response["error_message"] = result.ErrorMsg();
+            http_status = HTTPStatus::CODE_500;
+        }
+
+        return ResponseFactory::createResponse(http_status, json_response.dump());
+    }
+};
+
+class ShowTransactionsHandler final : public HttpRequestHandler {
+public:
+SharedPtr<OutgoingResponse> handle(const SharedPtr<IncomingRequest> &request) final {
+        auto infinity = Infinity::RemoteConnect();
+        DeferFn defer_fn([&]() { infinity->RemoteDisconnect(); });
+
+        nlohmann::json json_response;
+        HTTPStatus http_status;
+        QueryResult result = infinity->Query("show transactions");
+
+        if (result.IsOk()) {
+            SizeT block_rows = result.result_table_->DataBlockCount();
+            for (SizeT block_id = 0; block_id < block_rows; ++block_id) {
+                DataBlock *data_block = result.result_table_->GetDataBlockById(block_id).get();
+                auto row_count = data_block->row_count();
+                auto column_cnt = result.result_table_->ColumnCount();
+                for (int row = 0; row < row_count; ++row) {
+                    nlohmann::json json_table;
+                    for (SizeT col = 0; col < column_cnt; ++col) {
+                        const String &column_name = result.result_table_->GetColumnNameById(col);
+                        Value value = data_block->GetValue(col, row);
+                        const String &column_value = value.ToString();
+                        json_table[column_name] = column_value;
+                    }
+                    json_response["transactions"].push_back(json_table);
+                }
+            }
+            json_response["error_code"] = 0;
+            http_status = HTTPStatus::CODE_200;
+        } else {
+            json_response["error_code"] = result.ErrorCode();
+            json_response["error_message"] = result.ErrorMsg();
+            http_status = HTTPStatus::CODE_500;
+        }
+
+        return ResponseFactory::createResponse(http_status, json_response.dump());
+    }
+};
+
+class ShowTransactionHandler final : public HttpRequestHandler {
+public:
+SharedPtr<OutgoingResponse> handle(const SharedPtr<IncomingRequest> &request) final {
+        auto infinity = Infinity::RemoteConnect();
+        DeferFn defer_fn([&]() { infinity->RemoteDisconnect(); });
+
+        nlohmann::json json_response;
+        nlohmann::json json_table;
+        HTTPStatus http_status;
+        String transaction_id = request->getPathVariable("transaction_id");
+        QueryResult result = infinity->Query(fmt::format("show transaction {}", transaction_id));
+
+        if (result.IsOk()) {
+            DataBlock *data_block = result.result_table_->GetDataBlockById(0).get();
+            auto column_cnt = result.result_table_->ColumnCount();
+            for (SizeT col = 0; col < column_cnt; ++col) {
+                const String &column_name = result.result_table_->GetColumnNameById(col);
+                Value value = data_block->GetValue(col, 0);
+                const String &column_value = value.ToString();
+                json_table[column_name] = column_value;
+            }
+            json_response["error_code"] = 0;
+            json_response["transaction"]= json_table;
+            http_status = HTTPStatus::CODE_200;
+        } else {
+            json_response["error_code"] = result.ErrorCode();
+            json_response["error_message"] = result.ErrorMsg();
+            http_status = HTTPStatus::CODE_500;
+        }
+
+        return ResponseFactory::createResponse(http_status, json_response.dump());
+    }
+};
+
+
+
 class AdminShowCurrentNodeHandler final : public HttpRequestHandler {
 public:
     SharedPtr<OutgoingResponse> handle(const SharedPtr<IncomingRequest> &request) final {
@@ -3926,6 +4036,9 @@ void HTTPServer::Start(const String &ip_address, u16 port) {
     router->route("GET", "/instance/logs", MakeShared<ShowLogsHandler>());
     router->route("GET", "/instance/delta_checkpoint", MakeShared<ShowDeltaCheckpointHandler>());
     router->route("GET", "/instance/global_checkpoint", MakeShared<ShowFullCheckpointHandler>()); 
+    router->route("GET", "/instance/queries/{query_id}", MakeShared<ShowQueryHandler>());
+    router->route("GET", "/instance/transactions", MakeShared<ShowTransactionsHandler>());
+    router->route("GET", "/instance/transactions/{transaction_id}", MakeShared<ShowTransactionHandler>());
 
     // variable
     router->route("GET", "/variables/global", MakeShared<ShowGlobalVariablesHandler>());