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Initial public commit of mgmt

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This is a prototype that i'm attempting to "release early". Expect a lot
of changes! It is intended to be a config management tool that will:

* be event based
* execute actions in parallel
* function as a distributed system

There are a bunch more design ideas going into this, please stay tuned!
This commit is contained in:
James Shubin
2015-09-25 01:07:56 -04:00
commit 25ad05cce3
27 changed files with 2887 additions and 0 deletions
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mgmt-documentation.pdf
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This is a list of authors/contributors to the mgmt project.
If you're a contributor, please send a patch with your name.
If you appreciate the work of one of the contributors, thank them a beverage!
For a more exhaustive list please run: git log --format='%aN' | sort -u
This list is sorted alphabetically by first name.
James Shubin

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specific requirements.
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU AGPL, see
<http://www.gnu.org/licenses/>.

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Mgmt
Copyright (C) 2013-2015+ 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/>.

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#mgmt
<!--
Mgmt
Copyright (C) 2013-2015+ 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/>.
-->
##mgmt by [James](https://ttboj.wordpress.com/)
####Available from:
####[https://github.com/purpleidea/mgmt/](https://github.com/purpleidea/mgmt/)
####This documentation is available in: [Markdown](https://github.com/purpleidea/mgmt/blob/master/DOCUMENTATION.md) or [PDF](https://pdfdoc-purpleidea.rhcloud.com/pdf/https://github.com/purpleidea/mgmt/blob/master/DOCUMENTATION.md) format.
####Table of Contents
1. [Overview](#overview)
2. [Project description - What the project does](#project-description)
3. [Setup - Getting started with mgmt](#setup)
4. [Usage/FAQ - Notes on usage and frequently asked questions](#usage-and-frequently-asked-questions)
5. [Reference - Detailed reference](#reference)
* [graph.yaml](#graph.yaml)
* [Command line](#command-line)
6. [Examples - Example configurations](#examples)
7. [Development - Background on module development and reporting bugs](#development)
8. [Authors - Authors and contact information](#authors)
##Overview
The `mgmt` tool is a research prototype to demonstrate next generation config
management techniques. Hopefully it will evolve into a useful, robust tool.
##Project Description
The mgmt tool is a distributed, event driven, config management tool, that
supports parallel execution, and librarification to be used as the management
foundation in and for, new and existing software.
##Setup
During this prototype phase, the tool can be run out of the source directory.
You'll probably want to use ```./run.sh run --file examples/graph1.yaml``` to
get started. Beware that this _can_ cause data loss. Understand what you're
doing first, or perform these actions in a virtual environment such as the one
provided by [Oh-My-Vagrant](https://github.com/purpleidea/oh-my-vagrant).
##Usage and frequently asked questions
(Send your questions as a patch to this FAQ! I'll review it, merge it, and
respond by commit with the answer.)
###Why did you start this project?
I wanted a next generation config management solution that didn't have all of
the design flaws or limitations that the current generation of tools do, and no
tool existed!
###You didn't answer my question, or I have a question!
It's best to ask on [IRC](https://webchat.freenode.net/?channels=#mgmtconfig)
to see if someone can help you. Once we get a big enough community going, we'll
add a mailing list. If you don't get any response from the above, you can
contact me through my [technical blog](https://ttboj.wordpress.com/contact/)
and I'll do my best to help. If you have a good question, please add it as a
patch to this documentation. I'll merge your question, and add a patch with the
answer!
##Reference
Please note that there are a number of undocumented options. For more
information on these options, please view the source at:
[https://github.com/purpleidea/mgmt/](https://github.com/purpleidea/mgmt/).
If you feel that a well used option needs documenting here, please patch it!
###Overview of reference
* [graph.yaml](#graph.yaml): Main graph definition file.
* [Command line](#command-line): Command line parameters.
###graph.yaml
This is the compiled graph definition file. The format is currently
undocumented, but by looking through the [examples/](https://github.com/purpleidea/mgmt/tree/master/examples)
you can probably figure out most of it, as it's fairly intuitive.
###Command line
The main interface to the `mgmt` tool is the command line. For the most recent
documentation, please run `mgmt --help`.
####`--file <graph.yaml>`
Point to a graph file to run.
##Examples
For example configurations, please consult the [examples/](https://github.com/purpleidea/mgmt/tree/master/examples) directory in the git
source repository. It is available from:
[https://github.com/purpleidea/mgmt/tree/master/examples](https://github.com/purpleidea/mgmt/tree/master/examples)
##Development
This is a project that I started in my free time in 2013. Development is driven
by all of our collective patches! Dive right in, and start hacking!
Please contact me if you'd like to invite me to speak about this at your event.
You can follow along [on my technical blog](https://ttboj.wordpress.com/).
To report any bugs, please file a ticket at: [https://github.com/purpleidea/mgmt/issues](https://github.com/purpleidea/mgmt/issues).
##Authors
Copyright (C) 2013-2015+ James Shubin and the project contributors
Please see the
[AUTHORS](https://github.com/purpleidea/mgmt/tree/master/AUTHORS) file
for more information.
* [github](https://github.com/purpleidea/)
* [&#64;purpleidea](https://twitter.com/#!/purpleidea)
* [https://ttboj.wordpress.com/](https://ttboj.wordpress.com/)

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SHELL = /bin/bash
.PHONY: all version run race build clean test format docs
.SILENT: clean
VERSION := $(shell git describe --match '[0-9]*\.[0-9]*\.[0-9]*' --tags --dirty)
PROGRAM := $(notdir $(CURDIR))
all: docs
# show the current version
version:
@echo $(VERSION)
run:
find -maxdepth 1 -type f -name '*.go' -not -name '*_test.go' | xargs go run -ldflags "-X main.version $(VERSION) -X main.program $(PROGRAM)"
# include race test
race:
find -maxdepth 1 -type f -name '*.go' -not -name '*_test.go' | xargs go run -race -ldflags "-X main.version $(VERSION) -X main.program $(PROGRAM)"
build: mgmt
mgmt: main.go
go build -ldflags "-X main.version $(VERSION) -X main.program $(PROGRAM)"
clean:
[ ! -e mgmt ] || rm mgmt
test:
./test.sh
./test/test-gofmt.sh
./test/test-yamlfmt.sh
go test
#go test ./pgraph
go test -race
#go test -race ./pgraph
format:
find -type f -name '*.go' -not -path './old/*' -not -path './tmp/*' -exec gofmt -w {} \;
find -type f -name '*.yaml' -not -path './old/*' -not -path './tmp/*' -exec ruby -e "require 'yaml'; x=YAML.load_file('{}').to_yaml; File.open('{}', 'w').write x" \;
docs: mgmt-documentation.pdf
mgmt-documentation.pdf: DOCUMENTATION.md
pandoc DOCUMENTATION.md -o 'mgmt-documentation.pdf'

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Please see README.md

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# *mgmt*: This is: mgmt!
[![Build Status](https://secure.travis-ci.org/purpleidea/mgmt.png)](http://travis-ci.org/purpleidea/mgmt)
## Documentation:
Please see: [DOCUMENTATION.md](DOCUMENTATION.md) or [PDF](https://pdfdoc-purpleidea.rhcloud.com/pdf/https://github.com/purpleidea/mgmt/blob/master/DOCUMENTATION.md).
## Questions:
Come join us in [#mgmtconfig](https://webchat.freenode.net/?channels=#mgmtconfig) on Freenode!
## Examples:
Please look in the [examples/](examples/) folder for usage. If none exist, please contribute one!
## Notes:
* This is currently a research project into next generation config management technologies!
* This is my first complex project in golang, please notify me of any issues.
* I have some well thought out designs for the future of this project, which I'll try and write up clearly and publish as soon as possible.
* Please don't expect stable interfaces, code, or any data safety.
* This design is the result of ideas I've had from hacking on advanced config management projects.
* I first started hacking on this in ~2013, even though I had very little time for it.
* I couldn't think of a good name for the project, so it's now being called `mgmt` until someone contributes a better one!
* I've published a number of articles about this tool:
* TODO
* There are some screencasts available:
* TODO
## Dependencies:
* golang (available in most distros)
* pandoc (for building a pdf of the documentation)
## Patches:
We'd love to have your patch! Please send it by email, or as a pull request.
##
Happy hacking!

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Thanks to everyone who contributed to and supported this project in some way!
An exhaustive list is impossible, but a few honourable mentions are required.
Thanks (alphabetically) to:
Brian Bouters - For good config mgmt chats and encouraging me to release early.
Chris Wright - For encouraging me to continue work on my prototype.
Daniel Riek - For supporting and sheltering this project from bureaucracy.
Jeff Darcy - For some algorithm recommendations, and NACKing my TopoSort idea!
Red Hat, inc. - For paying my salary, thus financially supporting my hacking.
And many others...

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// Mgmt
// Copyright (C) 2013-2015+ 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 main
import (
"errors"
"gopkg.in/yaml.v2"
"io/ioutil"
"log"
)
type noopTypeConfig struct {
Name string `yaml:"name"`
}
type fileTypeConfig struct {
Name string `yaml:"name"`
Path string `yaml:"path"`
Content string `yaml:"content"`
State string `yaml:"state"`
}
type serviceTypeConfig struct {
Name string `yaml:"name"`
State string `yaml:"state"`
Startup string `yaml:"startup"`
}
type vertexConfig struct {
Type string `yaml:"type"`
Name string `yaml:"name"`
}
type edgeConfig struct {
Name string `yaml:"name"`
From vertexConfig `yaml:"from"`
To vertexConfig `yaml:"to"`
}
type graphConfig struct {
Graph string `yaml:"graph"`
Types struct {
Noop []noopTypeConfig `yaml:"noop"`
File []fileTypeConfig `yaml:"file"`
Service []serviceTypeConfig `yaml:"service"`
} `yaml:"types"`
Edges []edgeConfig `yaml:"edges"`
Comment string `yaml:"comment"`
}
func (c *graphConfig) Parse(data []byte) error {
if err := yaml.Unmarshal(data, c); err != nil {
return err
}
if c.Graph == "" {
return errors.New("Graph config: invalid `graph`")
}
return nil
}
func GraphFromConfig(filename string) *Graph {
var NoopMap map[string]*Vertex = make(map[string]*Vertex)
var FileMap map[string]*Vertex = make(map[string]*Vertex)
var ServiceMap map[string]*Vertex = make(map[string]*Vertex)
var lookup map[string]map[string]*Vertex = make(map[string]map[string]*Vertex)
lookup["noop"] = NoopMap
lookup["file"] = FileMap
lookup["service"] = ServiceMap
data, err := ioutil.ReadFile(filename)
if err != nil {
log.Fatal(err)
}
var config graphConfig
if err := config.Parse(data); err != nil {
log.Fatal(err)
}
//fmt.Printf("%+v\n", config) // debug
g := NewGraph(config.Graph)
for _, t := range config.Types.Noop {
NoopMap[t.Name] = NewVertex(t.Name, "noop")
// FIXME: duplicate of name stored twice... where should it go?
NoopMap[t.Name].Associate(NewNoopType(t.Name))
g.AddVertex(NoopMap[t.Name]) // call standalone in case not part of an edge
}
for _, t := range config.Types.File {
FileMap[t.Name] = NewVertex(t.Name, "file")
// FIXME: duplicate of name stored twice... where should it go?
FileMap[t.Name].Associate(NewFileType(t.Name, t.Path, t.Content, t.State))
g.AddVertex(FileMap[t.Name]) // call standalone in case not part of an edge
}
for _, t := range config.Types.Service {
ServiceMap[t.Name] = NewVertex(t.Name, "service")
// FIXME: duplicate of name stored twice... where should it go?
ServiceMap[t.Name].Associate(NewServiceType(t.Name, t.State, t.Startup))
g.AddVertex(ServiceMap[t.Name]) // call standalone in case not part of an edge
}
for _, e := range config.Edges {
g.AddEdge(lookup[e.From.Type][e.From.Name], lookup[e.To.Type][e.To.Name], NewEdge(e.Name))
}
return g
}

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// Mgmt
// Copyright (C) 2013-2015+ 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 main
import (
"code.google.com/p/go-uuid/uuid"
)
type Event struct {
uuid string
Name string
Type string
}
func NewEvent(name, t string) *Event {
return &Event{
uuid: uuid.New(),
Name: name,
Type: t,
}
}

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---
graph: mygraph
types:
noop:
- name: noop1
file:
- name: file1
path: /tmp/mgmt/f1
content: |
i am f1
state: exists
- name: file2
path: /tmp/mgmt/f2
content: |
i am f2
state: exists
- name: file3
path: /tmp/mgmt/f3
content: |
i am f3
state: exists
- name: file4
path: /tmp/mgmt/f4
content: |
i am f4 and i should not be here
state: absent
edges:
- name: e1
from:
type: file
name: file1
to:
type: file
name: file2
- name: e2
from:
type: file
name: file2
to:
type: file
name: file3

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---
graph: mygraph
types:
noop:
- name: noop1
file:
- name: file1
path: /tmp/mgmt/f1
content: |
i am f1
state: exists
service:
- name: purpleidea
state: running
startup: enabled
edges:
- name: e1
from:
type: noop
name: noop1
to:
type: file
name: file1
- name: e2
from:
type: file
name: file1
to:
type: service
name: purpleidea

339
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// Mgmt
// Copyright (C) 2013-2015+ 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 main
import (
"code.google.com/p/go-uuid/uuid"
"crypto/sha256"
"encoding/hex"
"fmt"
"gopkg.in/fsnotify.v1"
//"github.com/go-fsnotify/fsnotify" // git master of "gopkg.in/fsnotify.v1"
"io"
"log"
"math"
"os"
"path"
"strings"
"syscall"
)
type FileType struct {
uuid string
Type string // always "file"
Name string // name variable
Events chan string // FIXME: eventually a struct for the event?
Path string // path variable (should default to name)
Content string
State string // state: exists/present?, absent, (undefined?)
sha256sum string
}
func NewFileType(name, path, content, state string) *FileType {
// FIXME if path = nil, path = name ...
return &FileType{
uuid: uuid.New(),
Type: "file",
Name: name,
Events: make(chan string, 1), // XXX: chan size?
Path: path,
Content: content,
State: state,
sha256sum: "",
}
}
// File watcher for files and directories
// Modify with caution, probably important to write some test cases first!
func (obj FileType) Watch(v *Vertex) {
// obj.Path: file or directory
//var recursive bool = false
//var isdir = (obj.Path[len(obj.Path)-1:] == "/") // dirs have trailing slashes
//fmt.Printf("IsDirectory: %v\n", isdir)
var safename = path.Clean(obj.Path) // no trailing slash
watcher, err := fsnotify.NewWatcher()
if err != nil {
log.Fatal(err)
}
defer watcher.Close()
patharray := PathSplit(safename) // tokenize the path
var index = len(patharray) // starting index
var current string // current "watcher" location
var delta_depth int // depth delta between watcher and event
var send = false // send event?
var extraCheck = false
for {
current = strings.Join(patharray[0:index], "/")
if current == "" { // the empty string top is the root dir ("/")
current = "/"
}
log.Printf("Watching: %v\n", current) // attempting to watch...
// initialize in the loop so that we can reset on rm-ed handles
err = watcher.Add(current)
if err != nil {
if err == syscall.ENOENT {
index-- // usually not found, move up one dir
} else if err == syscall.ENOSPC {
// XXX: i sometimes see: no space left on device
// XXX: why causes this to happen ?
log.Printf("Strange file[%v] error: %+v\n", obj.Name, err.Error) // 0x408da0
log.Fatal(err)
} else {
log.Printf("Unknown file[%v] error:\n", obj.Name)
log.Fatal(err)
}
index = int(math.Max(1, float64(index)))
continue
}
// XXX: check state after inotify started
// SMALL RACE: after we terminate watch, till when it's started
// something could have gotten created/changed/etc... right?
if extraCheck {
extraCheck = false
// XXX
//if exists ... {
// send signal
// continue
// change index? i don't think so. be thorough and check
//}
}
select {
case event := <-watcher.Events:
// the deeper you go, the bigger the delta_depth is...
// this is the difference between what we're watching,
// and the event... doesn't mean we can't watch deeper
if current == event.Name {
delta_depth = 0 // i was watching what i was looking for
} else if HasPathPrefix(event.Name, current) {
delta_depth = len(PathSplit(current)) - len(PathSplit(event.Name)) // -1 or less
} else if HasPathPrefix(current, event.Name) {
delta_depth = len(PathSplit(event.Name)) - len(PathSplit(current)) // +1 or more
} else {
// XXX multiple watchers receive each others events
// https://github.com/go-fsnotify/fsnotify/issues/95
// this happened with two values such as:
// event.Name: /tmp/mgmt/f3 and current: /tmp/mgmt/f2
// are the different watchers getting each others events??
//log.Printf("The delta depth is NaN...\n")
//log.Printf("Value of event.Name is: %v\n", event.Name)
//log.Printf("........ current is: %v\n", current)
//log.Fatal("The delta depth is NaN!")
continue
}
//log.Printf("The delta depth is: %v\n", delta_depth)
// if we have what we wanted, awesome, send an event...
if event.Name == safename {
//log.Println("Event!")
send = true
// file removed, move the watch upwards
if delta_depth >= 0 && (event.Op&fsnotify.Remove == fsnotify.Remove) {
//log.Println("Removal!")
watcher.Remove(current)
index--
}
// we must be a parent watcher, so descend in
if delta_depth < 0 {
watcher.Remove(current)
index++
}
// if safename starts with event.Name, we're above, and no event should be sent
} else if HasPathPrefix(safename, event.Name) {
//log.Println("Above!")
if delta_depth >= 0 && (event.Op&fsnotify.Remove == fsnotify.Remove) {
log.Println("Removal!")
watcher.Remove(current)
index--
}
if delta_depth < 0 {
watcher.Remove(current)
index++
}
// if event.Name startswith safename, send event, we're already deeper
} else if HasPathPrefix(event.Name, safename) {
//log.Println("Event2!")
send = true
}
case err := <-watcher.Errors:
log.Println("error:", err)
log.Fatal(err)
v.Events <- fmt.Sprintf("file: %v", "error")
case exit := <-obj.Events:
if exit == "exit" {
return
} else {
log.Fatal("Unknown event: %v\n", exit)
}
}
// do all our event sending all together to avoid duplicate msgs
if send {
send = false
//log.Println("Sending event!")
//v.Events <- fmt.Sprintf("file(%v): %v", obj.Path, event.Op)
v.Events <- fmt.Sprintf("file(%v): %v", obj.Path, "event!") // FIXME: use struct
}
}
}
func (obj FileType) Exit() bool {
obj.Events <- "exit"
return true
}
func (obj FileType) HashSHA256fromContent() string {
if obj.sha256sum != "" { // return if already computed
return obj.sha256sum
}
hash := sha256.New()
hash.Write([]byte(obj.Content))
obj.sha256sum = hex.EncodeToString(hash.Sum(nil))
return obj.sha256sum
}
func (obj FileType) StateOK() bool {
if _, err := os.Stat(obj.Path); os.IsNotExist(err) {
// no such file or directory
if obj.State == "absent" {
return true // missing file should be missing, phew :)
} else {
// state invalid, skip expensive checksums
return false
}
}
// TODO: add file mode check here...
if PathIsDir(obj.Path) {
return obj.StateOKDir()
} else {
return obj.StateOKFile()
}
}
func (obj FileType) StateOKFile() bool {
if PathIsDir(obj.Path) {
log.Fatal("This should only be called on a File type.")
}
// run a diff, and return true if needs changing
hash := sha256.New()
f, err := os.Open(obj.Path)
if err != nil {
//log.Fatal(err)
return false
}
defer f.Close()
if _, err := io.Copy(hash, f); err != nil {
//log.Fatal(err)
return false
}
sha256sum := hex.EncodeToString(hash.Sum(nil))
//fmt.Printf("sha256sum: %v\n", sha256sum)
if obj.HashSHA256fromContent() == sha256sum {
return true
}
return false
}
func (obj FileType) StateOKDir() bool {
if !PathIsDir(obj.Path) {
log.Fatal("This should only be called on a Dir type.")
}
// XXX: not implemented
log.Fatal("Not implemented!")
return false
}
func (obj FileType) Apply() bool {
fmt.Printf("Apply->%v[%v]\n", obj.Type, obj.Name)
if PathIsDir(obj.Path) {
return obj.ApplyDir()
} else {
return obj.ApplyFile()
}
}
func (obj FileType) ApplyFile() bool {
if PathIsDir(obj.Path) {
log.Fatal("This should only be called on a File type.")
}
if obj.State == "absent" {
log.Printf("About to remove: %v\n", obj.Path)
err := os.Remove(obj.Path)
if err != nil {
return false
}
return true
}
//fmt.Println("writing: " + filename)
f, err := os.Create(obj.Path)
if err != nil {
log.Println("error:", err)
return false
}
defer f.Close()
_, err = io.WriteString(f, obj.Content)
if err != nil {
log.Println("error:", err)
return false
}
return true
}
func (obj FileType) ApplyDir() bool {
if !PathIsDir(obj.Path) {
log.Fatal("This should only be called on a Dir type.")
}
// XXX: not implemented
log.Fatal("Not implemented!")
return true
}

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// Mgmt
// Copyright (C) 2013-2015+ 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 main
import (
"fmt"
"github.com/codegangsta/cli"
"log"
"os"
"os/signal"
"sync"
"syscall"
"time"
)
// set at compile time
var (
version string
program string
)
const (
DEBUG = false
)
// signal handler
func waitForSignal(exit chan bool) {
signals := make(chan os.Signal, 1)
signal.Notify(signals, os.Interrupt) // catch ^C
//signal.Notify(signals, os.Kill) // catch signals
signal.Notify(signals, syscall.SIGTERM)
select {
case e := <-signals: // any signal will do
if e == os.Interrupt {
fmt.Println() // put ^C char from terminal on its own line
log.Println("Interrupted by ^C")
} else {
log.Println("Interrupted by signal")
}
case <-exit: // or a manual signal
log.Println("Interrupted by exit signal")
}
}
func run(c *cli.Context) {
var start int64 = time.Now().UnixNano()
var wg sync.WaitGroup
exit := make(chan bool) // exit signal
log.Printf("This is: %v, version: %v\n", program, version)
// exit after `exittime` seconds for no reason at all...
if i := c.Int("exittime"); i > 0 {
go func() {
time.Sleep(time.Duration(i) * time.Second)
exit <- true
}()
}
// build the graph from a config file
G := GraphFromConfig(c.String("file"))
log.Printf("Graph: %v\n", G) // show graph
log.Printf("Start: %v\n", start)
for x := range G.GetVerticesChan() { // XXX ?
log.Printf("Main->Starting[%v]\n", x.Name)
wg.Add(1)
// must pass in value to avoid races...
// see: https://ttboj.wordpress.com/2015/07/27/golang-parallelism-issues-causing-too-many-open-files-error/
go func(v *Vertex) {
defer wg.Done()
v.Start()
log.Printf("Main->Finish[%v]\n", v.Name)
}(x)
// generate a startup "poke" so that an initial check happens
go func(v *Vertex) {
v.Events <- fmt.Sprintf("Startup(%v)", v.Name)
}(x)
}
log.Println("Running...")
waitForSignal(exit) // pass in exit channel to watch
G.Exit() // tell all the children to exit
if DEBUG {
for i := range G.GetVerticesChan() {
fmt.Printf("Vertex: %v\n", i)
}
fmt.Printf("Graph: %v\n", G)
}
wg.Wait() // wait for primary go routines to exit
// TODO: wait for each vertex to exit...
log.Println("Goodbye!")
}
func main() {
app := cli.NewApp()
app.Name = program
app.Usage = "next generation config management"
app.Version = version
//app.Action = ... // without a default action, help runs
app.Commands = []cli.Command{
{
Name: "run",
Aliases: []string{"r"},
Usage: "run",
Action: run,
Flags: []cli.Flag{
cli.StringFlag{
Name: "file, f",
Value: "",
Usage: "graph definition to run",
},
cli.IntFlag{
Name: "exittime",
Value: 0,
Usage: "exit after a maximum of approximately this many seconds",
},
},
},
}
app.EnableBashCompletion = true
app.Run(os.Args)
}

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// Mgmt
// Copyright (C) 2013-2015+ 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 main
import (
//"testing"
)
//func TestT1(t *testing.T) {
//}

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// Mgmt
// Copyright (C) 2013-2015+ 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 main
import (
"path"
"strings"
)
// Similar to the GNU dirname command
func Dirname(p string) string {
d, _ := path.Split(path.Clean(p))
return d
}
// Split a path into an array of tokens excluding any trailing empty tokens
func PathSplit(p string) []string {
return strings.Split(path.Clean(p), "/")
}
// Does path string contain the given path prefix in it?
func HasPathPrefix(p, prefix string) bool {
patharray := PathSplit(p)
prefixarray := PathSplit(prefix)
if len(prefixarray) > len(patharray) {
return false
}
for i := 0; i < len(prefixarray); i++ {
if prefixarray[i] != patharray[i] {
return false
}
}
return true
}
func PathIsDir(p string) bool {
return p[len(p)-1:] == "/" // a dir has a trailing slash in this context
}

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// Mgmt
// Copyright (C) 2013-2015+ 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 main
import (
"testing"
)
func TestMiscT1(t *testing.T) {
if Dirname("/foo/bar/baz") != "/foo/bar/" {
t.Errorf("Result is incorrect.")
}
if Dirname("/foo/bar/baz/") != "/foo/bar/" {
t.Errorf("Result is incorrect.")
}
if Dirname("/") != "/" {
t.Errorf("Result is incorrect.")
}
}
func TestMiscT2(t *testing.T) {
// TODO: compare the output with the actual list
p1 := "/foo/bar/baz"
r1 := []string{"", "foo", "bar", "baz"}
if len(PathSplit(p1)) != len(r1) {
//t.Errorf("Result should be: %q.", r1)
t.Errorf("Result should have a length of: %v.", len(r1))
}
p2 := "/foo/bar/baz/"
r2 := []string{"", "foo", "bar", "baz"}
if len(PathSplit(p2)) != len(r2) {
t.Errorf("Result should have a length of: %v.", len(r2))
}
}
func TestMiscT3(t *testing.T) {
if HasPathPrefix("/foo/bar/baz", "/foo/ba") != false {
t.Errorf("Result should be false.")
}
if HasPathPrefix("/foo/bar/baz", "/foo/bar") != true {
t.Errorf("Result should be true.")
}
if HasPathPrefix("/foo/bar/baz", "/foo/bar/") != true {
t.Errorf("Result should be true.")
}
if HasPathPrefix("/foo/bar/baz/", "/foo/bar") != true {
t.Errorf("Result should be true.")
}
if HasPathPrefix("/foo/bar/baz/", "/foo/bar/") != true {
t.Errorf("Result should be true.")
}
if HasPathPrefix("/foo/bar/baz/", "/foo/bar/baz/dude") != false {
t.Errorf("Result should be false.")
}
}
func TestMiscT4(t *testing.T) {
if PathIsDir("/foo/bar/baz/") != true {
t.Errorf("Result should be false.")
}
if PathIsDir("/foo/bar/baz") != false {
t.Errorf("Result should be false.")
}
if PathIsDir("/foo/") != true {
t.Errorf("Result should be true.")
}
if PathIsDir("/") != true {
t.Errorf("Result should be true.")
}
}

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// Mgmt
// Copyright (C) 2013-2015+ 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/>.
// Pgraph (Pointer Graph)
package main
import (
"code.google.com/p/go-uuid/uuid"
//"container/list" // doubly linked list
"fmt"
"log"
"sync"
"time"
)
// The graph abstract data type (ADT) is defined as follows:
// NOTE: the directed graph arrows point from left to right ( --> )
// NOTE: the arrows point towards their dependencies (eg: arrows mean requires)
type Graph struct {
uuid string
Name string
Adjacency map[*Vertex]map[*Vertex]*Edge
//Directed bool
startcount int
}
type Vertex struct {
uuid string
graph *Graph // store a pointer to the graph it's on
Name string
Type string
Timestamp int64 // last updated timestamp ?
Events chan string // FIXME: eventually a struct for the event?
Typedata Type
data map[string]string
}
type Edge struct {
uuid string
Name string
}
func NewGraph(name string) *Graph {
return &Graph{
uuid: uuid.New(),
Name: name,
Adjacency: make(map[*Vertex]map[*Vertex]*Edge),
}
}
func NewVertex(name, t string) *Vertex {
return &Vertex{
uuid: uuid.New(),
Name: name,
Type: t,
Timestamp: -1,
Events: make(chan string, 1), // XXX: chan size?
data: make(map[string]string),
}
}
func NewEdge(name string) *Edge {
return &Edge{
uuid: uuid.New(),
Name: name,
}
}
// Graph() creates a new, empty graph.
// addVertex(vert) adds an instance of Vertex to the graph.
func (g *Graph) AddVertex(v *Vertex) {
if _, exists := g.Adjacency[v]; !exists {
g.Adjacency[v] = make(map[*Vertex]*Edge)
// store a pointer to the graph it's on for convenience and readability
v.graph = g
}
}
// addEdge(fromVert, toVert) Adds a new, directed edge to the graph that connects two vertices.
func (g *Graph) AddEdge(v1, v2 *Vertex, e *Edge) {
// NOTE: this doesn't allow more than one edge between two vertexes...
// TODO: is this a problem?
g.AddVertex(v1)
g.AddVertex(v2)
g.Adjacency[v1][v2] = e
}
// addEdge(fromVert, toVert, weight) Adds a new, weighted, directed edge to the graph that connects two vertices.
// getVertex(vertKey) finds the vertex in the graph named vertKey.
func (g *Graph) GetVertex(uuid string) chan *Vertex {
ch := make(chan *Vertex, 1)
go func(uuid string) {
for k := range g.Adjacency {
v := *k
if v.uuid == uuid {
ch <- k
break
}
}
close(ch)
}(uuid)
return ch
}
func (g *Graph) NumVertices() int {
return len(g.Adjacency)
}
func (g *Graph) NumEdges() int {
// XXX: not implemented
return -1
}
// get an array (slice) of all vertices in the graph
func (g *Graph) GetVertices() []*Vertex {
vertices := make([]*Vertex, 0)
for k := range g.Adjacency {
vertices = append(vertices, k)
}
return vertices
}
// returns a channel of all vertices in the graph
func (g *Graph) GetVerticesChan() chan *Vertex {
ch := make(chan *Vertex)
// TODO: do you need to pass this through into the go routine?
go func(ch chan *Vertex) {
for k := range g.Adjacency {
ch <- k
}
close(ch)
}(ch)
return ch
}
// make the graph pretty print
func (g *Graph) String() string {
return fmt.Sprintf("Vertices(%d), Edges(%d)", g.NumVertices(), g.NumEdges())
}
//func (s []*Vertex) contains(element *Vertex) bool {
// google/golang hackers apparently do not think contains should be a built-in!
func Contains(s []*Vertex, element *Vertex) bool {
for _, v := range s {
if element == v {
return true
}
}
return false
}
// return an array (slice) of all vertices that connect to vertex v
func (g *Graph) GraphEdges(vertex *Vertex) []*Vertex {
// TODO: we might be able to implement this differently by reversing
// the Adjacency graph and then looping through it again...
s := make([]*Vertex, 0) // stack
for w, _ := range g.Adjacency[vertex] { // forward paths
//fmt.Printf("forward: %v -> %v\n", v.Name, w.Name)
s = append(s, w)
}
for k, x := range g.Adjacency { // reverse paths
for w, _ := range x {
if w == vertex {
//fmt.Printf("reverse: %v -> %v\n", v.Name, k.Name)
s = append(s, k)
}
}
}
return s
}
// return an array (slice) of all directed vertices to vertex v
func (g *Graph) DirectedGraphEdges(vertex *Vertex) []*Vertex {
// TODO: we might be able to implement this differently by reversing
// the Adjacency graph and then looping through it again...
s := make([]*Vertex, 0) // stack
for w, _ := range g.Adjacency[vertex] { // forward paths
//fmt.Printf("forward: %v -> %v\n", v.Name, w.Name)
s = append(s, w)
}
return s
}
// get timestamp of a vertex
func (v *Vertex) GetTimestamp() int64 {
return v.Timestamp
}
// update timestamp of a vertex
func (v *Vertex) UpdateTimestamp() int64 {
v.Timestamp = time.Now().UnixNano() // update
return v.Timestamp
}
func (g *Graph) DFS(start *Vertex) []*Vertex {
d := make([]*Vertex, 0) // discovered
s := make([]*Vertex, 0) // stack
if _, exists := g.Adjacency[start]; !exists {
return nil // TODO: error
}
v := start
s = append(s, v)
for len(s) > 0 {
v, s = s[len(s)-1], s[:len(s)-1] // s.pop()
if !Contains(d, v) { // if not discovered
d = append(d, v) // label as discovered
for _, w := range g.GraphEdges(v) {
s = append(s, w)
}
}
}
return d
}
// build a new graph containing only vertices from the list...
func (g *Graph) FilterGraph(name string, vertices []*Vertex) *Graph {
newgraph := NewGraph(name)
for k1, x := range g.Adjacency {
for k2, e := range x {
//fmt.Printf("Filter: %v -> %v # %v\n", k1.Name, k2.Name, e.Name)
if Contains(vertices, k1) || Contains(vertices, k2) {
newgraph.AddEdge(k1, k2, e)
}
}
}
return newgraph
}
// return a channel containing the N disconnected graphs in our main graph
// we can then process each of these in parallel
func (g *Graph) GetDisconnectedGraphs() chan *Graph {
ch := make(chan *Graph)
go func() {
var start *Vertex
d := make([]*Vertex, 0) // discovered
c := g.NumVertices()
for len(d) < c {
// get an undiscovered vertex to start from
for _, s := range g.GetVertices() {
if !Contains(d, s) {
start = s
}
}
// dfs through the graph
dfs := g.DFS(start)
// filter all the collected elements into a new graph
newgraph := g.FilterGraph(g.Name, dfs)
// add number of elements found to found variable
d = append(d, dfs...) // extend
// return this new graph to the channel
ch <- newgraph
// if we've found all the elements, then we're done
// otherwise loop through to continue...
}
close(ch)
}()
return ch
}
func (v *Vertex) Value(key string) (string, bool) {
if value, exists := v.data[key]; exists {
return value, true
}
return "", false
}
func (v *Vertex) SetValue(key, value string) bool {
v.data[key] = value
return true
}
func (g *Graph) GetVerticesKeyValue(key, value string) chan *Vertex {
ch := make(chan *Vertex)
go func() {
for vertex := range g.GetVerticesChan() {
if v, exists := vertex.Value(key); exists && v == value {
ch <- vertex
}
}
close(ch)
}()
return ch
}
// return a pointer to the graph a vertex is on
func (v *Vertex) GetGraph() *Graph {
return v.graph
}
func HeisenbergCount(ch chan *Vertex) int {
c := 0
for x := range ch {
_ = x
c++
}
return c
}
func (v *Vertex) Associate(t Type) {
v.Typedata = t
}
func (v *Vertex) OKTimestamp() bool {
g := v.GetGraph()
for _, n := range g.DirectedGraphEdges(v) {
if v.GetTimestamp() > n.GetTimestamp() {
return false
}
}
return true
}
// poke the XXX children?
func (v *Vertex) Poke() {
g := v.GetGraph()
for _, n := range g.DirectedGraphEdges(v) { // XXX: do we want the reverse order?
// poke!
n.Events <- fmt.Sprintf("poke(%v)", v.Name)
}
}
func (g *Graph) Exit() {
// tell all the vertices to exit...
for v := range g.GetVerticesChan() {
v.Exit()
}
}
func (v *Vertex) Exit() {
v.Events <- "exit"
}
// main loop for each vertex
// warning: this logic might be subtle and tricky.
// be careful as it might not even be correct now!
func (v *Vertex) Start() {
log.Printf("Main->Vertex[%v]->Start()\n", v.Name)
//g := v.GetGraph()
var t = v.Typedata
// this whole wg2 wait group is only necessary if we need to wait for
// the go routine to exit...
var wg2 sync.WaitGroup
wg2.Add(1)
go func(v *Vertex, t Type) {
defer wg2.Done()
//fmt.Printf("About to watch [%v].\n", v.Name)
t.Watch(v)
}(v, t)
var ok bool
//XXX make sure dependencies run and become more current first...
for {
select {
case event := <-v.Events:
log.Printf("Event[%v]: %v\n", v.Name, event)
if event == "exit" {
t.Exit() // type exit
wg2.Wait() // wait for worker to exit
return
}
ok = true
if v.OKTimestamp() {
if !t.StateOK() { // TODO: can we rename this to something better?
// throw an error if apply fails...
// if this fails, don't UpdateTimestamp()
if !t.Apply() { // check for error
ok = false
}
}
if ok {
v.UpdateTimestamp() // this was touched...
v.Poke() // XXX
}
}
}
}
}

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// Mgmt
// Copyright (C) 2013-2015+ 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/>.
// NOTE: this is pgraph, a pointer graph
package main
import (
"testing"
)
func TestPgraphT1(t *testing.T) {
G := NewGraph("g1")
if i := G.NumVertices(); i != 0 {
t.Errorf("Should have 0 vertices instead of: %d.", i)
}
v1 := NewVertex("v1", "type")
v2 := NewVertex("v2", "type")
e1 := NewEdge("e1")
G.AddEdge(v1, v2, e1)
if i := G.NumVertices(); i != 2 {
t.Errorf("Should have 2 vertices instead of: %d.", i)
}
}
func TestPgraphT2(t *testing.T) {
G := NewGraph("g2")
v1 := NewVertex("v1", "type")
v2 := NewVertex("v2", "type")
v3 := NewVertex("v3", "type")
v4 := NewVertex("v4", "type")
v5 := NewVertex("v5", "type")
v6 := NewVertex("v6", "type")
e1 := NewEdge("e1")
e2 := NewEdge("e2")
e3 := NewEdge("e3")
e4 := NewEdge("e4")
e5 := NewEdge("e5")
//e6 := NewEdge("e6")
G.AddEdge(v1, v2, e1)
G.AddEdge(v2, v3, e2)
G.AddEdge(v3, v1, e3)
G.AddEdge(v4, v5, e4)
G.AddEdge(v5, v6, e5)
if i := G.NumVertices(); i != 6 {
t.Errorf("Should have 6 vertices instead of: %d.", i)
}
}
func TestPgraphT3(t *testing.T) {
G := NewGraph("g3")
v1 := NewVertex("v1", "type")
v2 := NewVertex("v2", "type")
v3 := NewVertex("v3", "type")
v4 := NewVertex("v4", "type")
v5 := NewVertex("v5", "type")
v6 := NewVertex("v6", "type")
e1 := NewEdge("e1")
e2 := NewEdge("e2")
e3 := NewEdge("e3")
e4 := NewEdge("e4")
e5 := NewEdge("e5")
//e6 := NewEdge("e6")
G.AddEdge(v1, v2, e1)
G.AddEdge(v2, v3, e2)
G.AddEdge(v3, v1, e3)
G.AddEdge(v4, v5, e4)
G.AddEdge(v5, v6, e5)
//G.AddEdge(v6, v4, e6)
out1 := G.DFS(v1)
if i := len(out1); i != 3 {
t.Errorf("Should have 3 vertices instead of: %d.", i)
t.Errorf("Found: %v", out1)
for _, v := range out1 {
t.Errorf("Value: %v", v.Name)
}
}
out2 := G.DFS(v4)
if i := len(out2); i != 3 {
t.Errorf("Should have 3 vertices instead of: %d.", i)
t.Errorf("Found: %v", out1)
for _, v := range out1 {
t.Errorf("Value: %v", v.Name)
}
}
}
func TestPgraphT4(t *testing.T) {
G := NewGraph("g4")
v1 := NewVertex("v1", "type")
v2 := NewVertex("v2", "type")
v3 := NewVertex("v3", "type")
e1 := NewEdge("e1")
e2 := NewEdge("e2")
e3 := NewEdge("e3")
G.AddEdge(v1, v2, e1)
G.AddEdge(v2, v3, e2)
G.AddEdge(v3, v1, e3)
out := G.DFS(v1)
if i := len(out); i != 3 {
t.Errorf("Should have 3 vertices instead of: %d.", i)
t.Errorf("Found: %v", out)
for _, v := range out {
t.Errorf("Value: %v", v.Name)
}
}
}
func TestPgraphT5(t *testing.T) {
G := NewGraph("g5")
v1 := NewVertex("v1", "type")
v2 := NewVertex("v2", "type")
v3 := NewVertex("v3", "type")
v4 := NewVertex("v4", "type")
v5 := NewVertex("v5", "type")
v6 := NewVertex("v6", "type")
e1 := NewEdge("e1")
e2 := NewEdge("e2")
e3 := NewEdge("e3")
e4 := NewEdge("e4")
e5 := NewEdge("e5")
//e6 := NewEdge("e6")
G.AddEdge(v1, v2, e1)
G.AddEdge(v2, v3, e2)
G.AddEdge(v3, v1, e3)
G.AddEdge(v4, v5, e4)
G.AddEdge(v5, v6, e5)
//G.AddEdge(v6, v4, e6)
save := []*Vertex{v1, v2, v3}
out := G.FilterGraph("new g5", save)
if i := out.NumVertices(); i != 3 {
t.Errorf("Should have 3 vertices instead of: %d.", i)
}
}
func TestPgraphT6(t *testing.T) {
G := NewGraph("g6")
v1 := NewVertex("v1", "type")
v2 := NewVertex("v2", "type")
v3 := NewVertex("v3", "type")
v4 := NewVertex("v4", "type")
v5 := NewVertex("v5", "type")
v6 := NewVertex("v6", "type")
e1 := NewEdge("e1")
e2 := NewEdge("e2")
e3 := NewEdge("e3")
e4 := NewEdge("e4")
e5 := NewEdge("e5")
//e6 := NewEdge("e6")
G.AddEdge(v1, v2, e1)
G.AddEdge(v2, v3, e2)
G.AddEdge(v3, v1, e3)
G.AddEdge(v4, v5, e4)
G.AddEdge(v5, v6, e5)
//G.AddEdge(v6, v4, e6)
graphs := G.GetDisconnectedGraphs()
HeisenbergGraphCount := func(ch chan *Graph) int {
c := 0
for x := range ch {
_ = x
c++
}
return c
}
if i := HeisenbergGraphCount(graphs); i != 2 {
t.Errorf("Should have 2 graphs instead of: %d.", i)
}
}

8
run.sh Executable file
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@@ -0,0 +1,8 @@
#!/bin/bash
# simple way to kick off runs of the project, since 'go run' sucks!
make build || exit 1
sudo ./mgmt "$@"
e=$?
make clean
exit $e

294
service.go Normal file
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@@ -0,0 +1,294 @@
// Mgmt
// Copyright (C) 2013-2015+ 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/>.
// NOTE: docs are found at: https://godoc.org/github.com/coreos/go-systemd/dbus
package main
import (
"code.google.com/p/go-uuid/uuid"
"fmt"
systemd "github.com/coreos/go-systemd/dbus" // change namespace
"github.com/coreos/go-systemd/util"
"github.com/godbus/dbus" // namespace collides with systemd wrapper
"log"
)
type ServiceType struct {
uuid string
Type string // always "service"
Name string // name variable
Events chan string // FIXME: eventually a struct for the event?
State string // state: running, stopped
Startup string // enabled, disabled, undefined
}
func NewServiceType(name, state, startup string) *ServiceType {
return &ServiceType{
uuid: uuid.New(),
Type: "service",
Name: name,
Events: make(chan string, 1), // XXX: chan size?
State: state,
Startup: startup,
}
}
// Service watcher
func (obj ServiceType) Watch(v *Vertex) {
// obj.Name: service name
if !util.IsRunningSystemd() {
log.Fatal("Systemd is not running.")
}
conn, err := systemd.NewSystemdConnection() // needs root access
if err != nil {
log.Fatal("Failed to connect to systemd: ", err)
}
defer conn.Close()
bus, err := dbus.SystemBus()
if err != nil {
log.Fatal("Failed to connect to bus: %v\n", err)
}
// XXX: will this detect new units?
bus.BusObject().Call("org.freedesktop.DBus.AddMatch", 0,
"type='signal',interface='org.freedesktop.systemd1.Manager',member='Reloading'")
buschan := make(chan *dbus.Signal, 10)
bus.Signal(buschan)
var service = fmt.Sprintf("%v.service", obj.Name) // systemd name
var send = false // send event?
var invalid = false // does the service exist or not?
var previous bool // previous invalid value
set := conn.NewSubscriptionSet() // no error should be returned
subChannel, subErrors := set.Subscribe()
var activeSet = false
for {
// XXX: watch for an event for new units...
// XXX: detect if startup enabled/disabled value changes...
previous = invalid
invalid = false
// firstly, does service even exist or not?
loadstate, err := conn.GetUnitProperty(service, "LoadState")
if err != nil {
log.Printf("Failed to get property: %v\n", err)
invalid = true
}
if !invalid {
var notFound = (loadstate.Value == dbus.MakeVariant("not-found"))
if notFound { // XXX: in the loop we'll handle changes better...
log.Printf("Failed to find service: %v\n", service)
invalid = true // XXX ?
}
}
if previous != invalid { // if invalid changed, send signal
send = true
}
if invalid {
log.Printf("Waiting for: %v\n", service) // waiting for service to appear...
if activeSet {
activeSet = false
set.Remove(service) // no return value should ever occur
}
select {
case _ = <-buschan: // XXX wait for new units event to unstick
// loop so that we can see the changed invalid signal
log.Printf("Service[%v]->DaemonReload()\n", service)
case exit := <-obj.Events:
if exit == "exit" {
return
} else {
log.Fatal("Unknown event: %v\n", exit)
}
}
} else {
if !activeSet {
activeSet = true
set.Add(service) // no return value should ever occur
}
log.Printf("Watching: %v\n", service) // attempting to watch...
select {
case event := <-subChannel:
log.Printf("Service event: %+v\n", event)
// NOTE: the value returned is a map for some reason...
if event[service] != nil {
// event[service].ActiveState is not nil
if event[service].ActiveState == "active" {
log.Printf("Service[%v]->Started()\n", service)
} else if event[service].ActiveState == "inactive" {
log.Printf("Service[%v]->Stopped!()\n", service)
} else {
log.Fatal("Unknown service state: ", event[service].ActiveState)
}
} else {
// service stopped (and ActiveState is nil...)
log.Printf("Service[%v]->Stopped\n", service)
}
send = true
case err := <-subErrors:
log.Println("error:", err)
log.Fatal(err)
v.Events <- fmt.Sprintf("service: %v", "error")
case exit := <-obj.Events:
if exit == "exit" {
return
} else {
log.Fatal("Unknown event: %v\n", exit)
}
}
}
if send {
send = false
//log.Println("Sending event!")
v.Events <- fmt.Sprintf("service(%v): %v", obj.Name, "event!") // FIXME: use struct
}
}
}
func (obj ServiceType) Exit() bool {
obj.Events <- "exit"
return true
}
func (obj ServiceType) StateOK() bool {
if !util.IsRunningSystemd() {
log.Fatal("Systemd is not running.")
}
conn, err := systemd.NewSystemdConnection() // needs root access
if err != nil {
log.Fatal("Failed to connect to systemd: ", err)
}
defer conn.Close()
var service = fmt.Sprintf("%v.service", obj.Name) // systemd name
loadstate, err := conn.GetUnitProperty(service, "LoadState")
if err != nil {
log.Printf("Failed to get load state: %v\n", err)
return false
}
// NOTE: we have to compare variants with other variants, they are really strings...
var notFound = (loadstate.Value == dbus.MakeVariant("not-found"))
if notFound {
log.Printf("Failed to find service: %v\n", service)
return false
}
// XXX: check service "enabled at boot" or not status...
//conn.GetUnitProperties(service)
activestate, err := conn.GetUnitProperty(service, "ActiveState")
if err != nil {
log.Fatal("Failed to get active state: ", err)
}
var running = (activestate.Value == dbus.MakeVariant("active"))
if obj.State == "running" {
if !running {
return false // we are in the wrong state
}
} else if obj.State == "stopped" {
if running {
return false
}
} else {
log.Fatal("Unknown state: ", obj.State)
}
return true // all is good, no state change needed
}
func (obj ServiceType) Apply() bool {
fmt.Printf("Apply->%v[%v]\n", obj.Type, obj.Name)
if !util.IsRunningSystemd() {
log.Fatal("Systemd is not running.")
}
conn, err := systemd.NewSystemdConnection() // needs root access
if err != nil {
log.Fatal("Failed to connect to systemd: ", err)
}
defer conn.Close()
var service = fmt.Sprintf("%v.service", obj.Name) // systemd name
var files = []string{service} // the service represented in a list
if obj.Startup == "enabled" {
_, _, err = conn.EnableUnitFiles(files, false, true)
} else if obj.Startup == "disabled" {
_, err = conn.DisableUnitFiles(files, false)
} else {
err = nil
}
if err != nil {
log.Printf("Unable to change startup status: %v\n", err)
return false
}
result := make(chan string, 1) // catch result information
if obj.State == "running" {
_, err := conn.StartUnit(service, "fail", result)
if err != nil {
log.Fatal("Failed to start unit: ", err)
return false
}
} else if obj.State == "stopped" {
_, err = conn.StopUnit(service, "fail", result)
if err != nil {
log.Fatal("Failed to stop unit: ", err)
return false
}
} else {
log.Fatal("Unknown state: ", obj.State)
}
status := <-result
if &status == nil {
log.Fatal("Result is nil")
return false
}
if status != "done" {
log.Fatal("Unknown return string: ", status)
return false
}
// XXX: also set enabled on boot
return true
}

11
test.sh Executable file
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@@ -0,0 +1,11 @@
#!/bin/bash -e
# test suite...
echo running test.sh
# ensure there is no trailing whitespace or other whitespace errors
git diff-tree --check $(git hash-object -t tree /dev/null) HEAD
# ensure entries to authors file are sorted
start=$(($(grep -n '^[[:space:]]*$' AUTHORS | awk -F ':' '{print $1}' | head -1) + 1))
diff <(tail -n +$start AUTHORS | sort) <(tail -n +$start AUTHORS)

35
test/test-gofmt.sh Executable file
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@@ -0,0 +1,35 @@
#!/bin/bash
# original version of this script from kubernetes project, under ALv2 license
set -o errexit
set -o nounset
set -o pipefail
ROOT=$(dirname "${BASH_SOURCE}")/..
GO_VERSION=($(go version))
if [[ -z $(echo "${GO_VERSION[2]}" | grep -E 'go1.2|go1.3|go1.4') ]]; then
echo "Unknown go version '${GO_VERSION}', skipping gofmt."
exit 0
fi
cd "${ROOT}"
find_files() {
find . -not \( \
\( \
-wholename './old' \
-o -wholename './tmp' \
\) -prune \
\) -name '*.go'
}
GOFMT="gofmt" # we prefer to not use the -s flag, which is pretty annoying...
bad_files=$(find_files | xargs $GOFMT -l)
if [[ -n "${bad_files}" ]]; then
echo 'FAIL'
echo 'The following files are not properly formatted:'
echo "${bad_files}"
exit 1
fi

33
test/test-yamlfmt.sh Executable file
View File

@@ -0,0 +1,33 @@
#!/bin/bash
# check for any yaml files that aren't properly formatted
set -o errexit
set -o nounset
set -o pipefail
ROOT=$(dirname "${BASH_SOURCE}")/..
cd "${ROOT}"
find_files() {
find . -not \( \
\( \
-wholename './old' \
-o -wholename './tmp' \
\) -prune \
\) -name '*.yaml'
}
bad_files=$(
for i in $(find_files); do
if ! diff -q <( ruby -e "require 'yaml'; puts YAML.load_file('$i').to_yaml" 2>/dev/null ) <( cat "$i" ) &>/dev/null; then
echo "$i"
fi
done
)
if [[ -n "${bad_files}" ]]; then
echo 'FAIL'
echo 'The following files are not properly formatted:'
echo "${bad_files}"
exit 1
fi

73
types.go Normal file
View File

@@ -0,0 +1,73 @@
// Mgmt
// Copyright (C) 2013-2015+ 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 main
import (
"code.google.com/p/go-uuid/uuid"
"fmt"
"log"
)
type Type interface {
//Name() string
Watch(*Vertex)
StateOK() bool // TODO: can we rename this to something better?
Apply() bool
Exit() bool
}
type NoopType struct {
uuid string
Type string // always "noop"
Name string // name variable
Events chan string // FIXME: eventually a struct for the event?
}
func NewNoopType(name string) *NoopType {
return &NoopType{
uuid: uuid.New(),
Type: "noop",
Name: name,
Events: make(chan string, 1), // XXX: chan size?
}
}
func (obj NoopType) Watch(v *Vertex) {
select {
case exit := <-obj.Events:
if exit == "exit" {
return
} else {
log.Fatal("Unknown event: %v\n", exit)
}
}
}
func (obj NoopType) Exit() bool {
obj.Events <- "exit"
return true
}
func (obj NoopType) StateOK() bool {
return true // never needs updating
}
func (obj NoopType) Apply() bool {
fmt.Printf("Apply->%v[%v]\n", obj.Type, obj.Name)
return true
}