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puppet.go
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puppet.go
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// Mgmt
// Copyright (C) 2013-2018+ 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 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/>.
// Package puppet provides the integration entrypoint for the puppet language.
package puppet
import (
"bufio"
"fmt"
"io"
"os/exec"
"strconv"
"strings"
"github.com/purpleidea/mgmt/yamlgraph"
errwrap "github.com/pkg/errors"
)
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 (obj *GAPI) runPuppetCommand(cmd *exec.Cmd) ([]byte, error) {
if obj.data.Debug {
obj.data.Logf("running command: %v", cmd)
}
stdout, err := cmd.StdoutPipe()
if err != nil {
return nil, errwrap.Wrapf(err, "error opening pipe to puppet command")
}
stderr, err := cmd.StderrPipe()
if err != nil {
return nil, errwrap.Wrapf(err, "error opening error pipe to puppet command")
}
if err := cmd.Start(); err != nil {
return nil, errwrap.Wrapf(err, "error starting puppet command")
}
// 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 {
obj.data.Logf("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 obj.data.Debug {
obj.data.Logf("read %d bytes of data from puppet", len(result))
}
for scanner := bufio.NewScanner(stderr); scanner.Scan(); {
obj.data.Logf("(output) %v", scanner.Text())
}
if err := cmd.Wait(); err != nil {
return nil, errwrap.Wrapf(err, "error waiting for puppet command to complete")
}
return result, nil
}
// ParseConfigFromPuppet returns the graph configuration structure from the mode
// and input values, including possibly some file and directory paths.
func (obj *GAPI) ParseConfigFromPuppet() (*yamlgraph.GraphConfig, error) {
var args []string
switch obj.Mode {
case "agent":
args = []string{"mgmtgraph", "print"}
case "file":
args = []string{"mgmtgraph", "print", "--manifest", obj.puppetFile}
case "string":
args = []string{"mgmtgraph", "print", "--code", obj.puppetString}
case "dir":
// TODO: run the code from the obj.puppetDir directory path
return nil, fmt.Errorf("not implemented") // XXX: not implemented
default:
panic(fmt.Sprintf("%s: unhandled case: %s", Name, obj.Mode))
}
if obj.puppetConf != "" {
args = append(args, "--config="+obj.puppetConf)
}
cmd := exec.Command("puppet", args...)
obj.data.Logf("launching translator")
var config yamlgraph.GraphConfig
if data, err := obj.runPuppetCommand(cmd); err != nil {
return nil, errwrap.Wrapf(err, "could not run puppet command")
} else if err := config.Parse(data); err != nil {
return nil, errwrap.Wrapf(err, "could not parse YAML output")
}
return &config, nil
}
// RefreshInterval returns the graph refresh interval from the puppet configuration.
func (obj *GAPI) refreshInterval() int {
if obj.data.Debug {
obj.data.Logf("determining graph refresh interval")
}
var cmd *exec.Cmd
if obj.puppetConf != "" {
cmd = exec.Command("puppet", "config", "print", "runinterval", "--config", obj.puppetConf)
} else {
cmd = exec.Command("puppet", "config", "print", "runinterval")
}
obj.data.Logf("inspecting runinterval configuration")
interval := 1800
data, err := obj.runPuppetCommand(cmd)
if err != nil {
obj.data.Logf("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 {
obj.data.Logf("error reading numeric runinterval value (%v), using default of %v", err, interval)
return interval
}
return int(result)
}