github.com/erda-project/erda-infra@v1.0.9/pkg/trace/inject/sql/go_database_sql_drivers.go (about)

     1  // Copyright (c) 2021 Terminus, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package sql
    16  
    17  import (
    18  	"database/sql"
    19  	"sync"
    20  
    21  	"github.com/XSAM/otelsql"
    22  	_ "github.com/go-sql-driver/mysql" //nolint
    23  
    24  	"github.com/erda-project/erda-infra/pkg/trace/inject/hook"
    25  )
    26  
    27  //go:noinline
    28  func originalOpen(driverName, dataSourceName string) (*sql.DB, error) {
    29  	return sql.Open(driverName, dataSourceName)
    30  }
    31  
    32  var (
    33  	driversMu sync.Mutex
    34  	drivers   = map[string]string{}
    35  )
    36  
    37  //go:noinline
    38  func tracedOpen(driverName, dataSourceName string) (*sql.DB, error) {
    39  	driversMu.Lock()
    40  	if dname, ok := drivers[driverName]; !ok {
    41  		// retrieve the driver implementation we need to wrap with instrumentation
    42  		db, err := originalOpen(driverName, "")
    43  		if err != nil {
    44  			driversMu.Unlock()
    45  			return nil, err
    46  		}
    47  		d := db.Driver()
    48  		if err = db.Close(); err != nil {
    49  			driversMu.Unlock()
    50  			return nil, err
    51  		}
    52  		dname = "otelsql-" + driverName
    53  		sql.Register(dname, wrapDriver(otelsql.WrapDriver(d, driverName)))
    54  		drivers[driverName] = dname
    55  		driverName = dname
    56  	} else {
    57  		driverName = dname
    58  	}
    59  	driversMu.Unlock()
    60  	return originalOpen(driverName, dataSourceName)
    61  }
    62  
    63  func init() {
    64  	hook.Hook(sql.Open, tracedOpen, originalOpen)
    65  }