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loader.go
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loader.go
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/*
* === This file is part of ALICE O² ===
*
* Copyright 2020 CERN and copyright holders of ALICE O².
* Author: Teo Mrnjavac <teo.mrnjavac@cern.ch>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* In applying this license CERN does not waive the privileges and
* immunities granted to it by virtue of its status as an
* Intergovernmental Organization or submit itself to any jurisdiction.
*/
package template
import (
"fmt"
"io"
"strings"
"github.com/AliceO2Group/Control/configuration/componentcfg"
)
// Implements pongo2.TemplateLoader to fetch included templates from Consul paths
type ConsulTemplateLoader struct {
basePath string
confSvc ConfigurationService
}
func NewConsulTemplateLoader(confSvc ConfigurationService, basePath string) *ConsulTemplateLoader {
return &ConsulTemplateLoader{
basePath: basePath,
confSvc: confSvc,
}
}
func (c *ConsulTemplateLoader) Abs(base, name string) string {
if strings.HasPrefix(name, "/") {
return name
}
if strings.HasPrefix(name, c.basePath) {
return name
}
if c.basePath == "" {
return name
}
return c.basePath + "/" + name
}
func (c *ConsulTemplateLoader) Get(path string) (io.Reader, error) {
query, err := componentcfg.NewQuery(path)
if err != nil {
return strings.NewReader(fmt.Sprintf("{\"error\":\"%s\"}", err.Error())), err
}
payload, err := c.confSvc.GetComponentConfiguration(query)
if err != nil {
log.WithError(err).
WithField("path", path).
Warn("failed to include component configuration in template")
return strings.NewReader(fmt.Sprintf("{\"error\":\"%s\"}", err.Error())), err
}
return strings.NewReader(payload), nil
}