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package bun
import (
"context"
"database/sql"
"reflect"
"strings"
"sync/atomic"
"time"
"github.com/uptrace/bun/schema"
)
type QueryEvent struct {
DB *DB
QueryAppender schema.Query
Query string
QueryArgs []interface{}
StartTime time.Time
Result sql.Result
Err error
Stash map[interface{}]interface{}
}
func (e *QueryEvent) Operation() string {
if e.QueryAppender != nil {
return e.QueryAppender.Operation()
}
return queryOperation(e.Query)
}
func queryOperation(query string) string {
if idx := strings.IndexByte(query, ' '); idx > 0 {
query = query[:idx]
}
if len(query) > 16 {
query = query[:16]
}
return query
}
type QueryHook interface {
BeforeQuery(context.Context, *QueryEvent) context.Context
AfterQuery(context.Context, *QueryEvent)
}
func (db *DB) beforeQuery(
ctx context.Context,
queryApp schema.Query,
query string,
queryArgs []interface{},
) (context.Context, *QueryEvent) {
atomic.AddUint64(&db.stats.Queries, 1)
if len(db.queryHooks) == 0 {
return ctx, nil
}
event := &QueryEvent{
DB: db,
QueryAppender: queryApp,
Query: query,
QueryArgs: queryArgs,
StartTime: time.Now(),
}
for _, hook := range db.queryHooks {
ctx = hook.BeforeQuery(ctx, event)
}
return ctx, event
}
func (db *DB) afterQuery(
ctx context.Context,
event *QueryEvent,
res sql.Result,
err error,
) {
switch err {
case nil, sql.ErrNoRows:
// nothing
default:
atomic.AddUint64(&db.stats.Errors, 1)
}
if event == nil {
return
}
event.Result = res
event.Err = err
db.afterQueryFromIndex(ctx, event, len(db.queryHooks)-1)
}
func (db *DB) afterQueryFromIndex(ctx context.Context, event *QueryEvent, hookIndex int) {
for ; hookIndex >= 0; hookIndex-- {
db.queryHooks[hookIndex].AfterQuery(ctx, event)
}
}
//------------------------------------------------------------------------------
func callBeforeScanHook(ctx context.Context, v reflect.Value) error {
return v.Interface().(schema.BeforeScanHook).BeforeScan(ctx)
}
func callAfterScanHook(ctx context.Context, v reflect.Value) error {
return v.Interface().(schema.AfterScanHook).AfterScan(ctx)
}
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