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provider.go
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provider.go
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// Copyright (c) 2021 Terminus, Inc.
//
// 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 cassandra_v2
import (
"context"
"fmt"
"github.com/scylladb/gocqlx"
"github.com/scylladb/gocqlx/qb"
"github.com/erda-project/erda-infra/base/logs"
"github.com/erda-project/erda-infra/base/servicehub"
"github.com/erda-project/erda-infra/providers/cassandra"
"github.com/erda-project/erda/modules/core/monitor/storekit"
"github.com/erda-project/erda/modules/msp/apm/trace/storage"
)
type (
config struct {
Cassandra cassandra.SessionConfig `file:"cassandra"`
ReadPageSize int `file:"read_page_size" default:"1024"`
}
provider struct {
Cfg *config
Log logs.Logger
Cassandra cassandra.Interface `autowired:"cassandra"`
queryFunc func(builder *qb.SelectBuilder, binding qb.M, dest interface{}) error
}
)
func (p *provider) Init(ctx servicehub.Context) (err error) {
session, err := p.Cassandra.NewSession(&p.Cfg.Cassandra)
if err != nil {
return fmt.Errorf("fail to create cassandra session: %s", err)
}
p.queryFunc = func(builder *qb.SelectBuilder, binding qb.M, dest interface{}) error {
stmt, names := builder.ToCql()
cql := gocqlx.Query(session.Session().Query(stmt), names).BindMap(binding)
return cql.SelectRelease(dest)
}
return nil
}
var _ storage.Storage = (*provider)(nil)
func (p *provider) NewWriter(ctx context.Context) (storekit.BatchWriter, error) {
return nil, storekit.ErrOpNotSupported
}
func init() {
servicehub.Register("span-storage-cassandra", &servicehub.Spec{
Services: []string{"span-storage-cassandra-reader"},
ConfigFunc: func() interface{} { return &config{} },
Creator: func() servicehub.Provider { return &provider{} },
})
}