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template.go
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template.go
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/*
Copyright 2018 caicloud authors. All rights reserved.
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 handler
import (
"context"
"io/ioutil"
"sync"
log "github.com/golang/glog"
"gopkg.in/yaml.v2"
"github.com/caicloud/cyclone/pkg/api"
httputil "github.com/caicloud/cyclone/pkg/util/http"
)
const TemplatePath = "/config/templates/templates.yaml"
var templates []*api.Template
var once sync.Once
// ListConfigTemplates handles the request to list all cyclone built-in pipeline config templates.
func ListConfigTemplates(ctx context.Context) api.ListResponse {
once.Do(
func() {
log.Infof("read pipeline config templates from %s", TemplatePath)
result, err := getConfigTemplates(TemplatePath)
if err != nil {
log.Errorf("unmarshal yaml config template file %s error: %v", TemplatePath, err)
return
}
templates = result
log.Info("read pipeline config templates succeed")
},
)
return httputil.ResponseWithList(templates, len(templates))
}
func getConfigTemplates(templatePath string) ([]*api.Template, error) {
data, err := ioutil.ReadFile(templatePath)
if err != nil {
log.Errorf("read config template file %s error: %v", templatePath, err)
return nil, err
}
templates := make([]*api.Template, 0)
err = yaml.Unmarshal(data, &templates)
if err != nil {
log.Errorf("unmarshal yaml config template file %s error: %v", templatePath, err)
return nil, err
}
return templates, nil
}