Arav/justcaptcha
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Struct's fields made private. expireScanInterval made into a field. SetExpiry() removed. Now go routine for expiry check is in a cleanExpired() private method and being called by a constructor. Implemented a constructor for InMemoryCaptchaDB.

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This commit is contained in:
Alexander Andreev 2022-08-19 02:15:34 +04:00
parent b7ba27b613
commit 7737c360d0
Signed by: Arav
GPG Key ID: 0388CC8FAA51063F
1 changed files with 37 additions and 26 deletions
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63
pkg/captcha/db.go
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@ -12,7 +12,7 @@ import (
var errorNotFound = errors.New("captcha not found")
var expiredScanInterval = 60 * time.Second
var defaultExpiredScanInterval = 60 * time.Second
type ID string
@ -29,19 +29,36 @@ func NewID(additionalData string, answer Answer) ID {
}
type CaptchaDB interface {
New(data string) (Captcha, ID)
SetExpiry(expiry time.Duration)
New(data string, captcha Captcha) (Captcha, ID)
GetExpiry() time.Duration
Image(id ID) (*image.Image, error)
Image(id ID, style string) (*image.Image, error)
Solve(id ID, answer Answer) (bool, error)
IsSolved(id ID) bool
IsSolved(id ID) (bool, error)
cleanExpired()
}
type InMemoryCaptchaDB struct {
sync.Mutex
DB map[ID]Captcha
ExpireIn time.Duration
db map[ID]Captcha
expireIn time.Duration
expireScanInterval time.Duration
}
func NewInMemoryCaptchaDB(expire time.Duration) *InMemoryCaptchaDB {
db := &InMemoryCaptchaDB{
db: make(map[ID]Captcha),
expireIn: expire}
if expire < defaultExpiredScanInterval {
db.expireScanInterval = expire
} else {
db.expireScanInterval = defaultExpiredScanInterval
}
db.cleanExpired()
return db
}
// New accepts an Captcha instance, generates an ID and store it in a database.
@ -51,29 +68,23 @@ func (cdb *InMemoryCaptchaDB) New(data string, captcha Captcha) (Captcha, ID) {
id := NewID(data, captcha.GetAnswer())
cdb.Lock()
cdb.DB[id] = captcha
cdb.db[id] = captcha
cdb.Unlock()
return captcha, id
}
// SetExpiry stores expire value and starts a goroutine
// that checks for expired CAPTCHAs.
func (cdb *InMemoryCaptchaDB) SetExpiry(expire time.Duration) {
cdb.ExpireIn = expire
if expire < expiredScanInterval {
expiredScanInterval = expire
}
// cleanExpired starts a goroutine that deletes expired CAPTCHAs.
func (cdb *InMemoryCaptchaDB) cleanExpired() {
go func() {
for {
sleepFor := expiredScanInterval - (time.Duration(time.Now().Second()) % expiredScanInterval)
sleepFor := cdb.expireScanInterval - (time.Duration(time.Now().Second()) % cdb.expireScanInterval)
time.Sleep(sleepFor)
cdb.Lock()
for id, captcha := range cdb.DB {
if time.Since(captcha.Expiry()) >= cdb.ExpireIn {
delete(cdb.DB, id)
for id, captcha := range cdb.db {
if time.Since(captcha.Expiry()) >= cdb.expireIn {
delete(cdb.db, id)
}
}
cdb.Unlock()
@ -83,14 +94,14 @@ func (cdb *InMemoryCaptchaDB) SetExpiry(expire time.Duration) {
// GetExpiry returns time for how long captcha will last.
func (cdb *InMemoryCaptchaDB) GetExpiry() time.Duration {
return cdb.ExpireIn
return cdb.expireIn
}
// Image returns image for a captcha.
func (cdb *InMemoryCaptchaDB) Image(id ID, style string) (*image.Image, error) {
cdb.Lock()
defer cdb.Unlock()
if c, ok := cdb.DB[id]; ok {
if c, ok := cdb.db[id]; ok {
return c.Image(style), nil
}
return nil, errorNotFound
@ -101,10 +112,10 @@ func (cdb *InMemoryCaptchaDB) Image(id ID, style string) (*image.Image, error) {
func (cdb *InMemoryCaptchaDB) Solve(id ID, answer Answer) (bool, error) {
cdb.Lock()
defer cdb.Unlock()
if c, ok := cdb.DB[id]; ok {
if c, ok := cdb.db[id]; ok {
ok = c.Solve(answer)
if !ok {
delete(cdb.DB, id)
delete(cdb.db, id)
}
return ok, nil
}
@ -116,9 +127,9 @@ func (cdb *InMemoryCaptchaDB) Solve(id ID, answer Answer) (bool, error) {
func (cdb *InMemoryCaptchaDB) IsSolved(id ID) (bool, error) {
cdb.Lock()
defer cdb.Unlock()
if c, ok := cdb.DB[id]; ok {
if c, ok := cdb.db[id]; ok {
ok = c.IsSolved()
delete(cdb.DB, id)
delete(cdb.db, id)
return ok, nil
}
return false, errorNotFound