1 files changed, 0 insertions, 92 deletions
diff --git a/src/pow/store.go b/src/pow/store.go
deleted file mode 100644
index 0b5e7d0..0000000
--- a/src/pow/store.go
+++ /dev/null
@@ -1,92 +0,0 @@
-package pow
-
-import (
-	"errors"
-	"sync"
-	"time"
-
-	"github.com/tilinna/clock"
-)
-
-// ErrSeedSolved is used to indicate a seed has already been solved.
-var ErrSeedSolved = errors.New("seed already solved")
-
-// Store is used to track information related to proof-of-work challenges and
-// solutions.
-type Store interface {
-
-	// MarkSolved will return ErrSeedSolved if the seed was already marked. The
-	// seed will be cleared from the Store once expiresAt is reached.
-	MarkSolved(seed []byte, expiresAt time.Time) error
-
-	Close() error
-}
-
-type inMemStore struct {
-	clock clock.Clock
-
-	m          map[string]time.Time
-	l          sync.Mutex
-	closeCh    chan struct{}
-	spinLoopCh chan struct{} // only used by tests
-}
-
-const inMemStoreGCPeriod = 5 * time.Second
-
-// NewMemoryStore initializes and returns an in-memory Store implementation.
-func NewMemoryStore(clock clock.Clock) Store {
-	s := &inMemStore{
-		clock:      clock,
-		m:          map[string]time.Time{},
-		closeCh:    make(chan struct{}),
-		spinLoopCh: make(chan struct{}, 1),
-	}
-	go s.spin(s.clock.NewTicker(inMemStoreGCPeriod))
-	return s
-}
-
-func (s *inMemStore) spin(ticker *clock.Ticker) {
-	defer ticker.Stop()
-
-	for {
-		select {
-		case <-ticker.C:
-			now := s.clock.Now()
-
-			s.l.Lock()
-			for seed, expiresAt := range s.m {
-				if !now.Before(expiresAt) {
-					delete(s.m, seed)
-				}
-			}
-			s.l.Unlock()
-
-		case <-s.closeCh:
-			return
-		}
-
-		select {
-		case s.spinLoopCh <- struct{}{}:
-		default:
-		}
-	}
-}
-
-func (s *inMemStore) MarkSolved(seed []byte, expiresAt time.Time) error {
-	seedStr := string(seed)
-
-	s.l.Lock()
-	defer s.l.Unlock()
-
-	if _, ok := s.m[seedStr]; ok {
-		return ErrSeedSolved
-	}
-
-	s.m[seedStr] = expiresAt
-	return nil
-}
-
-func (s *inMemStore) Close() error {
-	close(s.closeCh)
-	return nil
-}