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src/sql/engine/expr/ob_expr_last_trace_id.cpp

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+/**
+ * Copyright (c) 2021 OceanBase
+ * OceanBase CE is licensed under Mulan PubL v2.
+ * You can use this software according to the terms and conditions of the Mulan PubL v2.
+ * You may obtain a copy of Mulan PubL v2 at:
+ *          http://license.coscl.org.cn/MulanPubL-2.0
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PubL v2 for more details.
+ */
+
+#include "sql/engine/expr/ob_expr_last_trace_id.h"
+#include "sql/session/ob_sql_session_info.h"
+#include "sql/engine/ob_exec_context.h"
+
+using namespace oceanbase::common;
+
+namespace oceanbase {
+namespace sql {
+
+ObExprLastTraceId::ObExprLastTraceId(ObIAllocator& alloc)
+    : ObStringExprOperator(alloc, T_FUN_GET_LAST_TRACE_ID, N_LAST_TRACE_ID, 0)
+{}
+
+ObExprLastTraceId::~ObExprLastTraceId()
+{}
+
+int ObExprLastTraceId::calc_result_type0(ObExprResType& type, ObExprTypeCtx& type_ctx) const
+{
+  UNUSED(type_ctx);
+  type.set_varchar();
+  type.set_default_collation_type();
+  type.set_collation_level(CS_LEVEL_SYSCONST);
+  type.set_length(OB_MAX_DATABASE_NAME_LENGTH);
+  return OB_SUCCESS;
+}
+
+int ObExprLastTraceId::calc_result0(ObObj& result, ObExprCtx& expr_ctx) const
+{
+  int ret = OB_SUCCESS;
+  const ObSQLSessionInfo* session_info = NULL;
+  if (OB_ISNULL(session_info = expr_ctx.my_session_)) {
+    ret = OB_ERR_UNEXPECTED;
+    SQL_ENG_LOG(WARN, "session info is null");
+  } else {
+    common::ObCurTraceId::TraceId& trace_id =
+        const_cast<common::ObCurTraceId::TraceId&>(session_info->get_last_trace_id());
+    if (trace_id.is_invalid()) {
+      result.set_null();
+    } else {
+      const int64_t buf_len = 128;
+      char* buf = static_cast<char*>(expr_ctx.calc_buf_->alloc(buf_len));
+      int64_t pos = 0;
+      ObAddr server;
+      if (OB_ISNULL(buf)) {
+        ret = OB_ALLOCATE_MEMORY_FAILED;
+        SQL_ENG_LOG(ERROR, "fail to alloc memory", K(ret), K(buf));
+      } else if (OB_FAIL(trace_id.get_server_addr(server))) {
+        SQL_ENG_LOG(WARN, "fail to get server addr", K(ret));
+      } else if (OB_FAIL(server.ip_port_to_string(buf, buf_len))) {
+        SQL_ENG_LOG(WARN, "fail to print server ip", K(ret));
+      } else {
+        pos += strlen(buf);
+        BUF_PRINTF(", TraceId: " TRACE_ID_FORMAT, trace_id.get()[0], trace_id.get()[1]);
+        result.set_varchar(ObString(strlen(buf), buf));
+        result.set_collation(result_type_);
+      }
+    }
+  }
+  return ret;
+}
+
+int ObExprLastTraceId::eval_last_trace_id(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum)
+{
+  int ret = OB_SUCCESS;
+  UNUSED(expr);
+  const ObSQLSessionInfo* session_info = NULL;
+  if (OB_ISNULL(session_info = ctx.exec_ctx_.get_my_session())) {
+    ret = OB_ERR_UNEXPECTED;
+    SQL_ENG_LOG(WARN, "session info is null", K(ret));
+  } else {
+    const ObCurTraceId::TraceId& trace_id = session_info->get_last_trace_id();
+    if (trace_id.is_invalid()) {
+      expr_datum.set_null();
+    } else {
+      const int64_t MAX_BUF_LEN = 128;
+      char* buf = expr.get_str_res_mem(ctx, MAX_BUF_LEN);
+      int64_t pos = 0;
+      if (OB_ISNULL(buf)) {
+        ret = OB_ERR_UNEXPECTED;
+        SERVER_LOG(WARN, "buff is null", K(ret));
+      } else {
+        ObAddr server;
+        if (OB_FAIL(trace_id.get_server_addr(server))) {
+          SQL_ENG_LOG(WARN, "fail to get server addr", K(ret));
+        } else if (OB_FAIL(server.ip_port_to_string(buf, MAX_BUF_LEN))) {
+          SQL_ENG_LOG(WARN, "fail to print server ip", K(ret));
+        } else {
+          pos += strlen(buf);
+          if (OB_FAIL(databuff_printf(
+                  buf, MAX_BUF_LEN, pos, ", TraceId: " TRACE_ID_FORMAT, trace_id.get()[0], trace_id.get()[1]))) {
+            SQL_ENG_LOG(WARN, "fail to databuff_printf", K(ret));
+          } else {
+            expr_datum.set_string(buf, pos);
+          }
+        }
+      }
+    }
+  }
+  return ret;
+}
+
+int ObExprLastTraceId::cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const
+{
+  UNUSED(raw_expr);
+  UNUSED(op_cg_ctx);
+  rt_expr.eval_func_ = ObExprLastTraceId::eval_last_trace_id;
+  return OB_SUCCESS;
+}
+}  // namespace sql
+}  // namespace oceanbase