Added CoreDHCP generator tool

This tool generates the source file for a CoreDHCP server based on the
specified plugins. The tool must be run from its source directory,
otherwise it requires the -template argument.
Example:
./coredhcp-generator \
        github.com/coredhcp/coredhcp/plugins/{dns,file}

will generate a file called coredhcp.go in a temporary directory.

Signed-off-by: Andrea Barberio <insomniac@slackware.it>

.gitignore

@@ -4,4 +4,5 @@ cmds/coredhcp/leases4.txt
 cmds/coredhcp/config.yml
 cmds/coredhcp/coredhcp
 cmds/client/client
+cmds/coredhcp-generator/coredhcp-generator
 .vscode

cmds/coredhcp-generator/coredhcp.go.template

@@ -0,0 +1,53 @@
+// Copyright 2018-present the CoreDHCP Authors. All rights reserved
+// This source code is licensed under the MIT license found in the
+// LICENSE file in the root directory of this source tree.
+
+package main
+
+import (
+	"flag"
+	"time"
+
+	"github.com/coredhcp/coredhcp"
+	"github.com/coredhcp/coredhcp/config"
+	"github.com/coredhcp/coredhcp/logger"
+{{range $plugin := .}}
+	_ "{{$plugin}}"
+{{end}}
+	"github.com/sirupsen/logrus"
+)
+
+var (
+	flagLogFile     = flag.String("logfile", "", "Name of the log file to append to. Default: stdout/stderr only")
+	flagLogNoStdout = flag.Bool("nostdout", false, "Disable logging to stdout/stderr")
+	flagDebug       = flag.Bool("debug", false, "Enable debug output")
+)
+
+func main() {
+	flag.Parse()
+	log := logger.GetLogger("main")
+	if *flagDebug {
+		log.Logger.SetLevel(logrus.DebugLevel)
+		log.Infof("Enabled debug logging")
+	}
+	if *flagLogFile != "" {
+		log.Infof("Logging to file %s", *flagLogFile)
+		logger.WithFile(log, *flagLogFile)
+	}
+	if *flagLogNoStdout {
+		log.Infof("Disabling logging to stdout/stderr")
+		logger.WithNoStdOutErr(log)
+	}
+	config, err := config.Load()
+	if err != nil {
+		log.Fatal(err)
+	}
+	server := coredhcp.NewServer(config)
+	if err := server.Start(); err != nil {
+		log.Fatal(err)
+	}
+	if err := server.Wait(); err != nil {
+		log.Error(err)
+	}
+	time.Sleep(time.Second)
+}

cmds/coredhcp-generator/main.go

@@ -0,0 +1,69 @@
+// Copyright 2018-present the CoreDHCP Authors. All rights reserved
+// This source code is licensed under the MIT license found in the
+// LICENSE file in the root directory of this source tree.
+
+package main
+
+import (
+	"flag"
+	"html/template"
+	"io/ioutil"
+	"log"
+	"os"
+	"path"
+	"strings"
+)
+
+const (
+	defaultTemplateFile = "coredhcp.go.template"
+)
+
+var (
+	flagTemplate = flag.String("template", defaultTemplateFile, "Template file name")
+	flagOutfile  = flag.String("outfile", "", "Output file path")
+)
+
+func main() {
+	flag.Parse()
+	data, err := ioutil.ReadFile(*flagTemplate)
+	if err != nil {
+		log.Fatalf("Failed to read template file '%s': %v", *flagTemplate, err)
+	}
+	t, err := template.New("coredhcp").Parse(string(data))
+	if err != nil {
+		log.Fatalf("Template parsing failed: %v", err)
+	}
+	var plugins []string
+	for _, pl := range flag.Args() {
+		pl := strings.TrimSpace(pl)
+		if pl == "" {
+			continue
+		}
+		plugins = append(plugins, pl)
+	}
+	if len(plugins) == 0 {
+		log.Fatalf("No plugin specified!")
+	}
+	outfile := *flagOutfile
+	if outfile == "" {
+		tmpdir, err := ioutil.TempDir("", "coredhcp")
+		if err != nil {
+			log.Fatalf("Cannot create temporary directory: %v", err)
+		}
+		outfile = path.Join(tmpdir, "coredhcp.go")
+	}
+	log.Printf("Generating output file '%s' with %d plugins", outfile, len(plugins))
+	outFD, err := os.OpenFile(outfile, os.O_CREATE|os.O_WRONLY, 0644)
+	if err != nil {
+		log.Fatalf("Failed to create output file '%s': %v", outfile, err)
+	}
+	defer func() {
+		if err := outFD.Close(); err != nil {
+			log.Printf("Error while closing file descriptor for '%s': %v", outfile, err)
+		}
+	}()
+	if err := t.Execute(outFD, plugins); err != nil {
+		log.Fatalf("Template execution failed: %v", err)
+	}
+	log.Printf("Generated file '%s'. You can build it by running 'go build' in the output directory.", outfile)
+}

go.mod

@@ -5,19 +5,17 @@ go 1.12
 require (
 	github.com/chappjc/logrus-prefix v0.0.0-20180227015900-3a1d64819adb
 	github.com/coredhcp/plugins v0.0.0-20191121175107-a201c0b24a48
+	github.com/golangci/golangci-lint v1.21.0 // indirect
 	github.com/gomodule/redigo v2.0.0+incompatible
 	github.com/hugelgupf/socketpair v0.0.0-20190730060125-05d35a94e714 // indirect
 	github.com/insomniacslk/dhcp v0.0.0-20191112140002-c05874014012
-	github.com/mattn/go-colorable v0.1.2 // indirect
 	github.com/mdlayher/ethernet v0.0.0-20190606142754-0394541c37b7 // indirect
 	github.com/mdlayher/raw v0.0.0-20190606144222-a54781e5f38f // indirect
 	github.com/mgutz/ansi v0.0.0-20170206155736-9520e82c474b // indirect
-	github.com/onsi/ginkgo v1.9.0 // indirect
-	github.com/onsi/gomega v1.6.0 // indirect
 	github.com/rifflock/lfshook v0.0.0-20180920164130-b9218ef580f5
 	github.com/sirupsen/logrus v1.4.2
 	github.com/spf13/cast v1.3.0
 	github.com/spf13/viper v1.4.0
-	github.com/u-root/u-root v5.0.0+incompatible // indirect
+	github.com/u-root/u-root v6.0.0+incompatible // indirect
 	github.com/x-cray/logrus-prefixed-formatter v0.5.2 // indirect
 )

go.sum

@@ -2,11 +2,16 @@ cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMT
 github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
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 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
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 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
+github.com/bombsimon/wsl v1.2.5 h1:9gTOkIwVtoDZywvX802SDHokeX4kW1cKnV8ZTVAPkRs=
+github.com/bombsimon/wsl v1.2.5/go.mod h1:43lEF/i0kpXbLCeDXL9LMT8c92HyBywXb0AsgMHYngM=
 github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
 github.com/chappjc/logrus-prefix v0.0.0-20180227015900-3a1d64819adb h1:aZTKxMminKeQWHtzJBbV8TttfTxzdJ+7iEJFE6FmUzg=
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@@ -15,21 +20,57 @@ github.com/coredhcp/plugins v0.0.0-20191121175107-a201c0b24a48 h1:xY6m+9mE7ndS+o
 github.com/coredhcp/plugins v0.0.0-20191121175107-a201c0b24a48/go.mod h1:hJF/oFJEhbRGGTlpw/34hdLrKVR2rhafe1g+qwez4H8=
 github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
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+github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8NzMklzPG4d5KIOhIy30Tk=
 github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
 github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
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 github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
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 github.com/gogo/protobuf v1.2.1/go.mod h1:hp+jE20tsWTFYpLwKvXlhS1hjn+gTNwPg2I6zVXpSg4=
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@@ -37,13 +78,47 @@ github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfb
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@@ -185,6 +352,8 @@ gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLks
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
 gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
@@ -194,4 +363,16 @@ gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bl
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
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+gopkg.in/yaml.v2 v2.2.4 h1:/eiJrUcujPVeJ3xlSWaiNi3uSVmDGBK1pDHUHAnao1I=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
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+honnef.co/go/tools v0.0.1-2019.2.3 h1:3JgtbtFHMiCmsznwGVTUWbgGov+pVqnlf1dEJTNAXeM=
+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
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+sourcegraph.com/sqs/pbtypes v0.0.0-20180604144634-d3ebe8f20ae4/go.mod h1:ketZ/q3QxT9HOBeFhu6RdvsftgpsbFHBF5Cas6cDKZ0=