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aggregate.go
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aggregate.go
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/*
*
* Copyright 2021 waterdrop authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package mongo
import (
"context"
"time"
"github.com/UnderTreeTech/waterdrop/pkg/breaker"
"github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/ext"
"github.com/opentracing/opentracing-go/log"
"github.com/qiniu/qmgo"
)
type Aggregate struct {
ai qmgo.AggregateI
ctx context.Context
config *Config
span opentracing.Span
brk *breaker.BreakerGroup
}
// All iterates the cursor from aggregate and decodes each document into results.
func (a *Aggregate) All(results interface{}) (err error) {
err = a.brk.Do(a.config.Addr, func() error {
now := time.Now()
a.span = a.span.SetOperationName("aggregate_all")
defer a.span.Finish()
err = a.ai.All(results)
if ok, elapse := slowLog(now, a.config.SlowQueryDuration); ok {
ext.Error.Set(a.span, true)
a.span.LogFields(log.String("event", "slow_query"), log.Int64("elapse", int64(elapse)))
}
return err
}, accept)
return
}
// One iterates the cursor from aggregate and decodes current document into result.
func (a *Aggregate) One(result interface{}) (err error) {
err = a.brk.Do(a.config.Addr, func() error {
now := time.Now()
a.span = a.span.SetOperationName("aggregate_one")
defer a.span.Finish()
err = a.ai.One(result)
if ok, elapse := slowLog(now, a.config.SlowQueryDuration); ok {
ext.Error.Set(a.span, true)
a.span.LogFields(log.String("event", "slow_query"), log.Int64("elapse", int64(elapse)))
}
return err
}, accept)
return
}
// Iter return the cursor after aggregate
// In most scenario do not use Iter
func (a *Aggregate) Iter() qmgo.CursorI {
return a.ai.Iter()
}