/
external.go
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/
external.go
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// Copyright 2020 The Cloudprober 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 external adds support for an external server.
package external
import (
"context"
"fmt"
"os/exec"
"github.com/cloudprober/cloudprober/logger"
"github.com/cloudprober/cloudprober/metrics"
configpb "github.com/cloudprober/cloudprober/servers/external/proto"
"github.com/google/shlex"
)
// Server implements a external command runner.
type Server struct {
c *configpb.ServerConf
l *logger.Logger
cmdName string
cmdArgs []string
cmd *exec.Cmd
}
// TODO
// 1. Export health status (pid-file OR by monitoring the process started.)
// 2. Add support for command-line substitution.
// 2. Add auto-restart support.
// New creates a new external server.
func New(initCtx context.Context, c *configpb.ServerConf, l *logger.Logger) (*Server, error) {
cmdParts, err := shlex.Split(c.GetCommand())
if err != nil {
return nil, fmt.Errorf("error parsing command line (%s): %v", c.GetCommand(), err)
}
return &Server{
c: c,
l: l,
cmdName: cmdParts[0],
cmdArgs: cmdParts[1:len(cmdParts)],
}, nil
}
// Start runs the external command.
func (s *Server) Start(ctx context.Context, dataChan chan<- *metrics.EventMetrics) error {
s.cmd = exec.CommandContext(ctx, s.cmdName, s.cmdArgs...)
go func() {
err := s.cmd.Run()
s.l.Infof("Command %s started. Err status: %v", s.c.GetCommand(), err)
}()
return nil
}