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puppet.go
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puppet.go
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// Mgmt
// Copyright (C) 2013-2017+ James Shubin and the project contributors
// Written by James Shubin <james@shubin.ca> and the project contributors
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
// Package puppet provides the integration entrypoint for the puppet language.
package puppet
import (
"bufio"
"io"
"log"
"os/exec"
"strconv"
"strings"
"github.com/purpleidea/mgmt/yamlgraph"
)
const (
// PuppetYAMLBufferSize is the maximum buffer size for the yaml input data
PuppetYAMLBufferSize = 65535
// Debug is a local debug constant used in this module
Debug = false // FIXME: integrate with global debug flag
)
func runPuppetCommand(cmd *exec.Cmd) ([]byte, error) {
if Debug {
log.Printf("Puppet: running command: %v", cmd)
}
stdout, err := cmd.StdoutPipe()
if err != nil {
log.Printf("Puppet: Error opening pipe to puppet command: %v", err)
return nil, err
}
stderr, err := cmd.StderrPipe()
if err != nil {
log.Printf("Puppet: Error opening error pipe to puppet command: %v", err)
return nil, err
}
if err := cmd.Start(); err != nil {
log.Printf("Puppet: Error starting puppet command: %v", err)
return nil, err
}
// XXX: the current implementation is likely prone to fail
// as soon as the YAML data overflows the buffer.
data := make([]byte, PuppetYAMLBufferSize)
var result []byte
for err == nil {
var count int
count, err = stdout.Read(data)
if err != nil && err != io.EOF {
log.Printf("Puppet: Error reading YAML data from puppet: %v", err)
return nil, err
}
// Slicing down to the number of actual bytes is important, the YAML parser
// will choke on an oversized slice. http://stackoverflow.com/a/33726617/3356612
result = append(result, data[0:count]...)
}
if Debug {
log.Printf("Puppet: read %v bytes of data from puppet", len(result))
}
for scanner := bufio.NewScanner(stderr); scanner.Scan(); {
log.Printf("Puppet: (output) %v", scanner.Text())
}
if err := cmd.Wait(); err != nil {
log.Printf("Puppet: Error: puppet command did not complete: %v", err)
return nil, err
}
return result, nil
}
// ParseConfigFromPuppet takes a special puppet param string and config and
// returns the graph configuration structure.
func ParseConfigFromPuppet(puppetParam, puppetConf string) *yamlgraph.GraphConfig {
var puppetConfArg string
if puppetConf != "" {
puppetConfArg = "--config=" + puppetConf
}
var cmd *exec.Cmd
if puppetParam == "agent" {
cmd = exec.Command("puppet", "mgmtgraph", "print", puppetConfArg)
} else if strings.HasSuffix(puppetParam, ".pp") {
cmd = exec.Command("puppet", "mgmtgraph", "print", puppetConfArg, "--manifest", puppetParam)
} else {
cmd = exec.Command("puppet", "mgmtgraph", "print", puppetConfArg, "--code", puppetParam)
}
log.Println("Puppet: launching translator")
var config yamlgraph.GraphConfig
if data, err := runPuppetCommand(cmd); err != nil {
return nil
} else if err := config.Parse(data); err != nil {
log.Printf("Puppet: Error: Could not parse YAML output with Parse: %v", err)
return nil
}
return &config
}
// PuppetInterval returns the graph refresh interval from the puppet configuration.
func PuppetInterval(puppetConf string) int {
if Debug {
log.Printf("Puppet: determining graph refresh interval")
}
var cmd *exec.Cmd
if puppetConf != "" {
cmd = exec.Command("puppet", "config", "print", "runinterval", "--config", puppetConf)
} else {
cmd = exec.Command("puppet", "config", "print", "runinterval")
}
log.Println("Puppet: inspecting runinterval configuration")
interval := 1800
data, err := runPuppetCommand(cmd)
if err != nil {
log.Printf("Puppet: could not determine configured run interval (%v), using default of %v", err, interval)
return interval
}
result, err := strconv.ParseInt(strings.TrimSpace(string(data)), 10, 0)
if err != nil {
log.Printf("Puppet: error reading numeric runinterval value (%v), using default of %v", err, interval)
return interval
}
return int(result)
}