/
alpm.go
175 lines (158 loc) · 3.93 KB
/
alpm.go
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package main
import (
"bytes"
"errors"
alpm "github.com/remyoudompheng/go-alpm"
"io"
"net/http"
"os"
"sort"
"sync"
)
func init() {
http.HandleFunc("/", HandleHome)
http.HandleFunc("/repolist", HandleRepolist)
http.HandleFunc("/info", HandlePkgInfo)
}
var (
alpmHandle *alpm.Handle
alpmHandleFlag = new(sync.Once)
alpmHandleLock = new(sync.RWMutex)
)
func initAlpm() {
fconf, err := os.Open("/etc/pacman.conf")
if err != nil {
panic(err)
}
defer fconf.Close()
conf, err := alpm.ParseConfig(fconf)
if err != nil {
panic(err)
}
h, err := conf.CreateHandle()
if err != nil {
panic(err)
}
alpmHandle = h
}
func getAlpm() *alpm.Handle {
if alpmHandle == nil {
alpmHandleFlag.Do(initAlpm)
}
return alpmHandle
}
func getRepoList() ([]byte, error) {
alpmHandleLock.RLock()
defer alpmHandleLock.RUnlock()
h := getAlpm()
dblist, er := h.SyncDbs()
if er != nil {
return nil, er
}
s, er := Execute("repolist", CommonData{}, map[string]interface{}{
"Repos": dblist.Slice(),
})
return s, er
}
// forallFilenames iterates call() over all (relative) file paths
// from packages in db.
func forallFilenames(db *alpm.Db, call func(string) error) error {
return db.PkgCache().ForEach(func(pkg alpm.Package) error {
for _, file := range pkg.Files() {
er := call(file.Name)
if er != nil {
return er
}
}
return nil
})
}
var NoSuchPage = errors.New("undefined page")
type pkgPerBuildDate []alpm.Package
func (l pkgPerBuildDate) Len() int { return len(l) }
func (l pkgPerBuildDate) Swap(i, j int) { l[i], l[j] = l[j], l[i] }
func (l pkgPerBuildDate) Less(i, j int) bool { return l[i].BuildDate().After(l[j].BuildDate()) }
var _ sort.Interface = pkgPerBuildDate{}
func latestPackages() []alpm.Package {
alpmHandleLock.RLock()
defer alpmHandleLock.RUnlock()
h := getAlpm()
pkgs := make([]alpm.Package, 0)
syncs, err := h.SyncDbs()
if err != nil {
return nil
}
syncs.ForEach(func(db alpm.Db) error {
pkgs = append(pkgs, db.PkgCache().Slice()...)
return nil
})
sort.Sort(pkgPerBuildDate(pkgs))
if len(pkgs) > 20 {
pkgs = pkgs[:20]
}
return pkgs
}
// outdatedPackages returns {pkgname: {localver, syncver, repo}}
func outdatedPackages() map[string][3]string {
alpmHandleLock.RLock()
defer alpmHandleLock.RUnlock()
h := getAlpm()
localdb, err := h.LocalDb()
if err != nil {
return nil
}
syncs, err := h.SyncDbs()
if err != nil {
return nil
}
result := make(map[string][3]string, 16)
locals := make(map[string]string, 100)
syncvers := make(map[string][2]string, 100)
localdb.PkgCache().ForEach(func(pkg alpm.Package) error {
locals[pkg.Name()] = pkg.Version()
return nil
})
for _, db := range syncs.Slice() {
db.PkgCache().ForEach(func(pkg alpm.Package) error {
syncver, ok := syncvers[pkg.Name()]
if !ok || alpm.VerCmp(syncver[0], pkg.Version()) < 0 {
syncvers[pkg.Name()] = [2]string{pkg.Version(), pkg.DB().Name()}
}
return nil
})
}
for pkgname, localver := range locals {
if v, ok := syncvers[pkgname]; ok && alpm.VerCmp(localver, v[0]) < 0 {
result[pkgname] = [3]string{localver, v[0], v[1]}
}
}
return result
}
// HandleHome displays the homepage.
func HandleHome(resp http.ResponseWriter, req *http.Request) {
logRequest(req)
if req.URL.Path != "/" {
resp.WriteHeader(http.StatusNotFound)
ErrorPage(resp, CommonData{}, http.StatusNotFound, NoSuchPage)
return
}
page, er := Execute("homepage", CommonData{}, map[string]interface{}{
"Latest": latestPackages(),
"Outdated": outdatedPackages(),
})
if er != nil {
ErrorPage(resp, CommonData{}, http.StatusInternalServerError, er)
} else {
io.Copy(resp, bytes.NewBuffer(page))
}
}
// HandleRepolist displays basic information about available sync DBs.
func HandleRepolist(resp http.ResponseWriter, req *http.Request) {
logRequest(req)
page, er := getRepoList()
if er != nil {
ErrorPage(resp, CommonData{}, http.StatusInternalServerError, er)
} else {
io.Copy(resp, bytes.NewBuffer(page))
}
}