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/
servers.go
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/
servers.go
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// Copyright 2017 Google 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 servers provides an interface to initialize cloudprober servers using servers config.
*/
package servers
import (
"context"
"html/template"
"github.com/google/cloudprober/logger"
"github.com/google/cloudprober/metrics"
"github.com/google/cloudprober/servers/grpc"
"github.com/google/cloudprober/servers/http"
configpb "github.com/google/cloudprober/servers/proto"
"github.com/google/cloudprober/servers/udp"
"github.com/google/cloudprober/web/formatutils"
)
// StatusTmpl variable stores the HTML template suitable to generate the
// servers' status for cloudprober's /status page. It expects an array of
// ServerInfo objects as input.
var StatusTmpl = template.Must(template.New("statusTmpl").Parse(`
<table class="status-list">
<tr>
<th>Type</th>
<th>Conf</th>
</tr>
{{ range . }}
<tr>
<td>{{.Type}}</td>
<td>
{{if .Conf}}
<pre>{{.Conf}}</pre>
{{else}}
default
{{end}}
</td>
</tr>
{{ end }}
</table>
`))
// Server interface has only one method: Start.
type Server interface {
Start(ctx context.Context, dataChan chan<- *metrics.EventMetrics) error
}
// ServerInfo encapsulates a Server and related info.
type ServerInfo struct {
Server
Type string
Conf string
}
// Init initializes cloudprober servers, based on the provided config.
func Init(initCtx context.Context, serverDefs []*configpb.ServerDef) (servers []*ServerInfo, err error) {
for _, serverDef := range serverDefs {
var l *logger.Logger
l, err = logger.NewCloudproberLog(serverDef.GetType().String())
if err != nil {
return
}
var conf interface{}
var server Server
switch serverDef.GetType() {
case configpb.ServerDef_HTTP:
server, err = http.New(initCtx, serverDef.GetHttpServer(), l)
conf = serverDef.GetHttpServer()
case configpb.ServerDef_UDP:
server, err = udp.New(initCtx, serverDef.GetUdpServer(), l)
conf = serverDef.GetUdpServer()
case configpb.ServerDef_GRPC:
server, err = grpc.New(initCtx, serverDef.GetGrpcServer(), l)
conf = serverDef.GetGrpcServer()
}
if err != nil {
return
}
servers = append(servers, &ServerInfo{
Server: server,
Type: serverDef.GetType().String(),
Conf: formatutils.ConfToString(conf),
})
}
return
}