moth/cmd/mothd/mothballs.go

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package main
import (
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"archive/zip"
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"bufio"
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"fmt"
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"io"
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"log"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/spf13/afero"
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"github.com/spf13/afero/zipfs"
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)
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type zipCategory struct {
afero.Fs
io.Closer
}
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// Mothballs provides a collection of active mothball files (puzzle categories)
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type Mothballs struct {
afero.Fs
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categories map[string]zipCategory
categoryLock *sync.RWMutex
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}
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// NewMothballs returns a new Mothballs structure backed by the provided directory
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func NewMothballs(fs afero.Fs) *Mothballs {
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return &Mothballs{
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Fs: fs,
categories: make(map[string]zipCategory),
categoryLock: new(sync.RWMutex),
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}
}
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func (m *Mothballs) getCat(cat string) (zipCategory, bool) {
m.categoryLock.RLock()
defer m.categoryLock.RUnlock()
ret, ok := m.categories[cat]
return ret, ok
}
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// Open returns a ReadSeekCloser corresponding to the filename in a puzzle's category and points
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func (m *Mothballs) Open(cat string, points int, filename string) (ReadSeekCloser, time.Time, error) {
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zc, ok := m.getCat(cat)
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if !ok {
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return nil, time.Time{}, fmt.Errorf("No such category: %s", cat)
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}
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f, err := zc.Open(fmt.Sprintf("content/%d/%s", points, filename))
if err != nil {
return nil, time.Time{}, err
}
fInfo, err := f.Stat()
return f, fInfo.ModTime(), err
}
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// Inventory returns the list of current categories
func (m *Mothballs) Inventory() []Category {
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m.categoryLock.RLock()
defer m.categoryLock.RUnlock()
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categories := make([]Category, 0, 20)
for cat, zfs := range m.categories {
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pointsList := make([]int, 0, 20)
pf, err := zfs.Open("puzzles.txt")
if err != nil {
// No puzzles = no category
continue
}
scanner := bufio.NewScanner(pf)
for scanner.Scan() {
line := scanner.Text()
if pointval, err := strconv.Atoi(line); err != nil {
log.Printf("Reading points for %s: %s", cat, err.Error())
} else {
pointsList = append(pointsList, pointval)
}
}
categories = append(categories, Category{cat, pointsList})
}
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return categories
}
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// CheckAnswer returns an error if the provided answer is in any way incorrect for the given category and points
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func (m *Mothballs) CheckAnswer(cat string, points int, answer string) error {
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zfs, ok := m.getCat(cat)
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if !ok {
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return fmt.Errorf("No such category: %s", cat)
}
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af, err := zfs.Open("answers.txt")
if err != nil {
return fmt.Errorf("No answers.txt file")
}
defer af.Close()
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needle := fmt.Sprintf("%d %s", points, answer)
scanner := bufio.NewScanner(af)
for scanner.Scan() {
if scanner.Text() == needle {
return nil
}
}
return fmt.Errorf("Invalid answer")
}
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// refresh refreshes internal state.
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// It looks for changes to the directory listing, and caches any new mothballs.
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func (m *Mothballs) refresh() {
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m.categoryLock.Lock()
defer m.categoryLock.Unlock()
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// Any new categories?
files, err := afero.ReadDir(m.Fs, "/")
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if err != nil {
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log.Println("Error listing mothballs:", err)
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return
}
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found := make(map[string]bool)
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for _, f := range files {
filename := f.Name()
if !strings.HasSuffix(filename, ".mb") {
continue
}
categoryName := strings.TrimSuffix(filename, ".mb")
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found[categoryName] = true
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if _, ok := m.categories[categoryName]; !ok {
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f, err := m.Fs.Open(filename)
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if err != nil {
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log.Println(err)
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continue
}
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fi, err := f.Stat()
if err != nil {
f.Close()
log.Println(err)
continue
}
zrc, err := zip.NewReader(f, fi.Size())
if err != nil {
f.Close()
log.Println(err)
continue
}
m.categories[categoryName] = zipCategory{
Fs: zipfs.New(zrc),
Closer: f,
}
log.Println("Adding category:", categoryName)
}
}
// Delete anything in the list that wasn't found
for categoryName, zc := range m.categories {
if !found[categoryName] {
zc.Close()
delete(m.categories, categoryName)
log.Println("Removing category:", categoryName)
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}
}
}
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// Maintain performs housekeeping for Mothballs.
func (m *Mothballs) Maintain(updateInterval time.Duration) {
m.refresh()
for range time.NewTicker(updateInterval).C {
m.refresh()
}
}