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forge.go
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forge.go
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package main
import (
"archive/tar"
"encoding/json"
"fmt"
"github.com/klauspost/pgzip"
"io"
"io/ioutil"
"log"
"net/http"
"os"
"os/exec"
"regexp"
"strconv"
"strings"
"sync"
"time"
)
func doModuleInstallOrNothing(m string) {
ma := strings.Split(m, "-")
moduleName := ma[0] + "-" + ma[1]
moduleVersion := ma[2]
workDir := config.ForgeCacheDir + m
fr := ForgeResult{false, ma[2]}
if moduleVersion == "latest" {
if _, err := os.Stat(workDir); os.IsNotExist(err) {
Debugf("doModuleInstallOrNothing(): " + workDir + " did not exists, fetching module")
// check forge API what the latest version is
fr = queryForgeApi(moduleName, "false")
if fr.needToGet {
if _, ok := uniqueForgeModules[moduleName+"-"+fr.versionNumber]; ok {
Debugf("doModuleInstallOrNothing(): no need to fetch Forge module " + moduleName + " in latest, because latest is " + fr.versionNumber + " and that will already be fetched")
fr.needToGet = false
versionDir := config.ForgeCacheDir + moduleName + "-" + fr.versionNumber
Debugf("doModuleInstallOrNothing(): trying to create symlink " + workDir + " pointing to " + versionDir)
if err := os.Symlink(versionDir, workDir); err != nil {
log.Println("doModuleInstallOrNothing(): 1 Error while create symlink "+workDir+" pointing to "+versionDir, err)
os.Exit(1)
}
//} else {
//Debugf("doModuleInstallOrNothing(): need to fetch Forge module " + moduleName + " in latest, because version " + fr.versionNumber + " will not be fetched already")
//fmt.Println(needToGet)
}
}
} else {
// check forge API if latest version of this module has been updated
Debugf("doModuleInstallOrNothing(): check forge API if latest version of module " + moduleName + " has been updated")
// XXX: disable adding If-Modified-Since head for now
// because then the latestForgeModules does not get set with the actual module version for latest
// maybe if received 304 get the actual version from the -latest symlink
fr = queryForgeApi(moduleName, "false")
//fmt.Println(needToGet)
}
} else if moduleVersion == "present" {
// ensure that a latest version this module exists
latestDir := config.ForgeCacheDir + moduleName + "-latest"
if _, err := os.Stat(latestDir); os.IsNotExist(err) {
if _, ok := uniqueForgeModules[moduleName+"-latest"]; ok {
Debugf("doModuleInstallOrNothing(): we got " + m + ", but no " + latestDir + " to use, but -latest is already being fetched.")
return
} else {
Debugf("doModuleInstallOrNothing(): we got " + m + ", but no " + latestDir + " to use. Getting -latest")
doModuleInstallOrNothing(moduleName + "-latest")
}
return
} else {
Debugf("doModuleInstallOrNothing(): Nothing to do for module " + m + ", because " + latestDir + " exists")
}
} else {
if _, err := os.Stat(workDir); os.IsNotExist(err) {
fr.needToGet = true
} else {
Debugf("doModuleInstallOrNothing(): Using cache for " + moduleName + " in version " + moduleVersion + " because " + workDir + " exists")
return
}
}
//fmt.Println("fr.needToGet for ", m, fr.needToGet)
if fr.needToGet {
if ma[2] != "latest" {
Debugf("doModuleInstallOrNothing(): Trying to remove: " + workDir)
_ = os.Remove(workDir)
} else {
versionDir, _ := os.Readlink(workDir)
if versionDir == config.ForgeCacheDir+moduleName+"-"+fr.versionNumber {
Debugf("doModuleInstallOrNothing(): No reason to re-symlink again")
} else {
Debugf("doModuleInstallOrNothing(): Trying to remove symlink: " + workDir)
_ = os.Remove(workDir)
versionDir = config.ForgeCacheDir + moduleName + "-" + fr.versionNumber
Debugf("doModuleInstallOrNothing(): trying to create symlink " + workDir + " pointing to " + versionDir)
if err := os.Symlink(versionDir, workDir); err != nil {
log.Println("doModuleInstallOrNothing(): 2 Error while create symlink "+workDir+" pointing to "+versionDir, err)
os.Exit(1)
}
}
}
downloadForgeModule(moduleName, fr.versionNumber)
}
}
func queryForgeApi(name string, file string) ForgeResult {
//url := "https://forgeapi.puppetlabs.com:443/v3/modules/" + strings.Replace(name, "/", "-", -1)
url := "https://forgeapi.puppetlabs.com:443/v3/modules?query=" + name
req, err := http.NewRequest("GET", url, nil)
if err != nil {
log.Fatal("queryForgeApi(): Error creating GET request for Puppetlabs forge API", err)
os.Exit(1)
}
if fileInfo, err := os.Stat(file); err == nil {
Debugf("queryForgeApi(): adding If-Modified-Since:" + string(fileInfo.ModTime().Format("Mon, 02 Jan 2006 15:04:05 GMT")) + " to Forge query")
req.Header.Set("If-Modified-Since", fileInfo.ModTime().Format("Mon, 02 Jan 2006 15:04:05 GMT"))
}
req.Header.Set("User-Agent", "https://github.com/xorpaul/g10k/")
req.Header.Set("Connection", "close")
proxyUrl, err := http.ProxyFromEnvironment(req)
if err != nil {
log.Fatal("queryForgeApi(): Error while getting http proxy with golang http.ProxyFromEnvironment()", err)
os.Exit(1)
}
client := &http.Client{Transport: &http.Transport{Proxy: http.ProxyURL(proxyUrl)}}
before := time.Now()
resp, err := client.Do(req)
duration := time.Since(before).Seconds()
Verbosef("Querying Forge API " + url + " took " + strconv.FormatFloat(duration, 'f', 5, 64) + "s")
mutex.Lock()
syncForgeTime += duration
mutex.Unlock()
if err != nil {
panic(err)
}
defer resp.Body.Close()
if resp.Status == "200 OK" {
// need to get latest version
body, err := ioutil.ReadAll(resp.Body)
//fmt.Println(string(body))
reCurrent := regexp.MustCompile("\\s*\"current_release\": {\n\\s*\"uri\": \"([^\"]+)\",")
if m := reCurrent.FindStringSubmatch(string(body)); len(m) > 1 {
//fmt.Println(m[1])
if strings.Count(m[1], "-") < 2 {
log.Fatal("queryForgeApi(): Error: Something went wrong while trying to figure out what version is current for Forge module ", name, " ", m[1], " should contain three '-' characters")
os.Exit(1)
} else {
version := strings.Split(m[1], "-")[2]
Debugf("queryForgeApi(): found version " + version + " for " + name + "-latest")
mutex.Lock()
latestForgeModules[name] = version
mutex.Unlock()
return ForgeResult{true, version}
}
}
if err != nil {
panic(err)
}
return ForgeResult{false, ""}
} else if resp.Status == "304 Not Modified" {
Debugf("queryForgeApi(): Got 304 nothing to do for module " + name)
return ForgeResult{false, ""}
} else {
Debugf("queryForgeApi(): Unexpected response code " + resp.Status)
return ForgeResult{false, ""}
}
}
func downloadForgeModule(name string, version string) {
//url := "https://forgeapi.puppetlabs.com/v3/files/puppetlabs-apt-2.1.1.tar.gz"
fileName := name + "-" + version + ".tar.gz"
if _, err := os.Stat(config.ForgeCacheDir + name + "-" + version); os.IsNotExist(err) {
url := "https://forgeapi.puppetlabs.com/v3/files/" + fileName
req, err := http.NewRequest("GET", url, nil)
req.Header.Set("User-Agent", "https://github.com/xorpaul/g10k/")
req.Header.Set("Connection", "close")
proxyUrl, err := http.ProxyFromEnvironment(req)
if err != nil {
log.Fatal("downloadForgeModule(): Error while getting http proxy with golang http.ProxyFromEnvironment()", err)
os.Exit(1)
}
client := &http.Client{Transport: &http.Transport{Proxy: http.ProxyURL(proxyUrl)}}
before := time.Now()
resp, err := client.Do(req)
duration := time.Since(before).Seconds()
Verbosef("GETing " + url + " took " + strconv.FormatFloat(duration, 'f', 5, 64) + "s")
mutex.Lock()
syncForgeTime += duration
mutex.Unlock()
if err != nil {
log.Print("downloadForgeModule(): Error while GETing Forge module ", name, " from ", url, ": ", err)
os.Exit(1)
}
defer resp.Body.Close()
if resp.Status == "200 OK" {
Debugf("downloadForgeModule(): Trying to create " + config.ForgeCacheDir + fileName)
out, err := os.Create(config.ForgeCacheDir + fileName)
if err != nil {
log.Print("downloadForgeModule(): Error while creating file for Forge module "+config.ForgeCacheDir+fileName, err)
os.Exit(1)
}
defer out.Close()
io.Copy(out, resp.Body)
file, err := os.Open(config.ForgeCacheDir + fileName)
if err != nil {
fmt.Println("downloadForgeModule(): Error while opening file", file, err)
os.Exit(1)
}
defer file.Close()
var fileReader io.ReadCloser = resp.Body
if strings.HasSuffix(fileName, ".gz") {
if fileReader, err = pgzip.NewReader(file); err != nil {
fmt.Println("downloadForgeModule(): pgzip reader error for module ", fileName, " error:", err)
os.Exit(1)
}
defer fileReader.Close()
}
tarBallReader := tar.NewReader(fileReader)
if err = os.Chdir(config.ForgeCacheDir); err != nil {
fmt.Println("downloadForgeModule(): error while chdir to", config.ForgeCacheDir, err)
os.Exit(1)
}
for {
header, err := tarBallReader.Next()
if err != nil {
if err == io.EOF {
break
}
fmt.Println("downloadForgeModule(): error while tar reader.Next() for ", fileName, err)
os.Exit(1)
}
// get the individual filename and extract to the current directory
filename := header.Name
//Debugf("downloadForgeModule(): Trying to extract file" + filename)
switch header.Typeflag {
case tar.TypeDir:
// handle directory
//fmt.Println("Creating directory :", filename)
//err = os.MkdirAll(filename, os.FileMode(header.Mode)) // or use 0755 if you prefer
err = os.MkdirAll(filename, os.FileMode(0755)) // or use 0755 if you prefer
if err != nil {
fmt.Println("downloadForgeModule(): error while MkdirAll()", filename, err)
os.Exit(1)
}
case tar.TypeReg:
// handle normal file
//fmt.Println("Untarring :", filename)
writer, err := os.Create(filename)
if err != nil {
fmt.Println("downloadForgeModule(): error while Create()", filename, err)
os.Exit(1)
}
io.Copy(writer, tarBallReader)
err = os.Chmod(filename, os.FileMode(0644))
if err != nil {
fmt.Println("downloadForgeModule(): error while Chmod()", filename, err)
os.Exit(1)
}
writer.Close()
default:
fmt.Printf("Unable to untar type : %c in file %s", header.Typeflag, filename)
}
}
} else {
log.Print("downloadForgeModule(): Unexpected response code while GETing " + url + resp.Status)
os.Exit(1)
}
} else {
Debugf("downloadForgeModule(): Using cache for Forge module " + name + " version: " + version)
}
}
// readModuleMetadata returns the Forgemodule struct of the given module file path
func readModuleMetadata(file string) ForgeModule {
content, _ := ioutil.ReadFile(file)
var f interface{}
if err := json.Unmarshal(content, &f); err != nil {
Debugf("readModuleMetadata(): err: " + fmt.Sprint(err))
return ForgeModule{}
}
m := f.(map[string]interface{})
if !strings.Contains(m["name"].(string), "-") {
return ForgeModule{}
} else {
return ForgeModule{name: strings.Split(m["name"].(string), "-")[1], version: m["version"].(string), author: strings.ToLower(m["author"].(string))}
}
}
func resolveForgeModules(modules map[string]struct{}) {
var wgForge sync.WaitGroup
for m := range modules {
wgForge.Add(1)
go func(m string) {
defer wgForge.Done()
Debugf("Trying to get forge module " + m)
doModuleInstallOrNothing(m)
}(m)
}
wgForge.Wait()
}
func syncForgeToModuleDir(name string, m ForgeModule, moduleDir string) {
mutex.Lock()
syncForgeCount++
mutex.Unlock()
moduleName := strings.Replace(name, "/", "-", -1)
//Debugf("syncForgeToModuleDir(): m.name " + m.name + " m.version " + m.version + " moduleName " + moduleName)
targetDir := moduleDir + m.name
targetDir = checkDirAndCreate(targetDir, "as targetDir for module "+name)
if m.version == "present" {
if _, err := os.Stat(targetDir + "metadata.json"); err == nil {
Debugf("syncForgeToModuleDir(): Nothing to do, found existing Forge module: " + targetDir + "metadata.json")
return
} else {
// safe to do, because we ensured in doModuleInstallOrNothing() that -latest exists
m.version = "latest"
}
}
if _, err := os.Stat(targetDir + "metadata.json"); err == nil {
me := readModuleMetadata(targetDir + "metadata.json")
if m.version == "latest" {
//log.Println(latestForgeModules)
if _, ok := latestForgeModules[moduleName]; ok {
Debugf("syncForgeToModuleDir(): using version " + latestForgeModules[moduleName] + " for " + moduleName + "-" + m.version)
m.version = latestForgeModules[moduleName]
}
}
if me.version == m.version {
Debugf("syncForgeToModuleDir(): Nothing to do, existing Forge module: " + targetDir + " has the same version " + me.version + " as the to be synced version: " + m.version)
return
}
log.Println("syncForgeToModuleDir(): Need to sync, because existing Forge module: " + targetDir + " has version " + me.version + " and the to be synced version is: " + m.version)
createOrPurgeDir(targetDir, " targetDir for module "+me.name)
}
workDir := config.ForgeCacheDir + moduleName + "-" + m.version + "/"
if _, err := os.Stat(workDir); os.IsNotExist(err) {
log.Print("syncForgeToModuleDir(): Forge module not found in dir: ", workDir)
os.Exit(1)
} else {
Infof("Need to sync " + targetDir)
cmd := "cp --link --archive " + workDir + "* " + targetDir
before := time.Now()
out, err := exec.Command("bash", "-c", cmd).CombinedOutput()
duration := time.Since(before).Seconds()
mutex.Lock()
cpForgeTime += duration
mutex.Unlock()
Verbosef("Executing " + cmd + " took " + strconv.FormatFloat(duration, 'f', 5, 64) + "s")
if err != nil {
log.Println("Failed to execute command: ", cmd, " Output: ", string(out))
log.Print("syncForgeToModuleDir(): Error while trying to hardlink ", workDir, " to ", targetDir, " :", err)
os.Exit(1)
}
}
}