1 files changed, 0 insertions, 165 deletions
diff --git a/pkg/state/single.go b/pkg/state/single.go
deleted file mode 100644
index 695f0e3..0000000
--- a/pkg/state/single.go
+++ /dev/null
@@ -1,165 +0,0 @@
-package state
-
-import (
-	"context"
-	"crypto"
-	"crypto/ed25519"
-	"fmt"
-	"sync"
-	"time"
-
-	"git.sigsum.org/log-go/pkg/db"
-	"git.sigsum.org/sigsum-go/pkg/log"
-	"git.sigsum.org/sigsum-go/pkg/types"
-)
-
-// StateManagerSingle implements a single-instance StateManager
-type StateManagerSingle struct {
-	client    db.Client
-	signer    crypto.Signer
-	namespace types.Hash
-	interval  time.Duration
-	deadline  time.Duration
-
-	// Lock-protected access to pointers.  A write lock is only obtained once
-	// per interval when doing pointer rotation.  All endpoints are readers.
-	sync.RWMutex
-	signedTreeHead   *types.SignedTreeHead
-	cosignedTreeHead *types.CosignedTreeHead
-
-	// Syncronized and deduplicated witness cosignatures for signedTreeHead
-	events       chan *event
-	cosignatures map[types.Hash]*types.Signature
-}
-
-func NewStateManagerSingle(client db.Client, signer crypto.Signer, interval, deadline time.Duration) (*StateManagerSingle, error) {
-	sm := &StateManagerSingle{
-		client:    client,
-		signer:    signer,
-		namespace: *types.HashFn(signer.Public().(ed25519.PublicKey)),
-		interval:  interval,
-		deadline:  deadline,
-	}
-	sth, err := sm.latestSTH(context.Background())
-	sm.setCosignedTreeHead()
-	sm.setToCosignTreeHead(sth)
-	return sm, err
-}
-
-func (sm *StateManagerSingle) Run(ctx context.Context) {
-	rotation := func() {
-		nextSTH, err := sm.latestSTH(ctx)
-		if err != nil {
-			log.Warning("cannot rotate without tree head: %v", err)
-			return
-		}
-		sm.rotate(nextSTH)
-	}
-	sm.events = make(chan *event, 4096)
-	defer close(sm.events)
-	ticker := time.NewTicker(sm.interval)
-	defer ticker.Stop()
-
-	rotation()
-	for {
-		select {
-		case <-ticker.C:
-			rotation()
-		case ev := <-sm.events:
-			sm.handleEvent(ev)
-		case <-ctx.Done():
-			return
-		}
-	}
-}
-
-func (sm *StateManagerSingle) ToCosignTreeHead(_ context.Context) (*types.SignedTreeHead, error) {
-	sm.RLock()
-	defer sm.RUnlock()
-	return sm.signedTreeHead, nil
-}
-
-func (sm *StateManagerSingle) CosignedTreeHead(_ context.Context) (*types.CosignedTreeHead, error) {
-	sm.RLock()
-	defer sm.RUnlock()
-	if sm.cosignedTreeHead == nil {
-		return nil, fmt.Errorf("no cosignatures available")
-	}
-	return sm.cosignedTreeHead, nil
-}
-
-func (sm *StateManagerSingle) AddCosignature(ctx context.Context, pub *types.PublicKey, sig *types.Signature) error {
-	sm.RLock()
-	defer sm.RUnlock()
-
-	msg := sm.signedTreeHead.TreeHead.ToBinary(&sm.namespace)
-	if !ed25519.Verify(ed25519.PublicKey(pub[:]), msg, sig[:]) {
-		return fmt.Errorf("invalid cosignature")
-	}
-	select {
-	case sm.events <- &event{types.HashFn(pub[:]), sig}:
-		return nil
-	case <-ctx.Done():
-		return fmt.Errorf("request timeout")
-	}
-}
-
-func (sm *StateManagerSingle) rotate(nextSTH *types.SignedTreeHead) {
-	sm.Lock()
-	defer sm.Unlock()
-
-	log.Debug("rotating tree heads")
-	sm.handleEvents()
-	sm.setCosignedTreeHead()
-	sm.setToCosignTreeHead(nextSTH)
-}
-
-func (sm *StateManagerSingle) handleEvents() {
-	log.Debug("handling any outstanding events")
-	for i, n := 0, len(sm.events); i < n; i++ {
-		sm.handleEvent(<-sm.events)
-	}
-}
-
-func (sm *StateManagerSingle) handleEvent(ev *event) {
-	log.Debug("handling event from witness %x", ev.keyHash[:])
-	sm.cosignatures[*ev.keyHash] = ev.cosignature
-}
-
-func (sm *StateManagerSingle) setCosignedTreeHead() {
-	n := len(sm.cosignatures)
-	if n == 0 {
-		sm.cosignedTreeHead = nil
-		return
-	}
-
-	var cth types.CosignedTreeHead
-	cth.SignedTreeHead = *sm.signedTreeHead
-	cth.Cosignature = make([]types.Signature, 0, n)
-	cth.KeyHash = make([]types.Hash, 0, n)
-	for keyHash, cosignature := range sm.cosignatures {
-		cth.KeyHash = append(cth.KeyHash, keyHash)
-		cth.Cosignature = append(cth.Cosignature, *cosignature)
-	}
-	sm.cosignedTreeHead = &cth
-}
-
-func (sm *StateManagerSingle) setToCosignTreeHead(nextSTH *types.SignedTreeHead) {
-	sm.cosignatures = make(map[types.Hash]*types.Signature)
-	sm.signedTreeHead = nextSTH
-}
-
-func (sm *StateManagerSingle) latestSTH(ctx context.Context) (*types.SignedTreeHead, error) {
-	ictx, cancel := context.WithTimeout(ctx, sm.deadline)
-	defer cancel()
-
-	th, err := sm.client.GetTreeHead(ictx)
-	if err != nil {
-		return nil, fmt.Errorf("failed fetching tree head: %v", err)
-	}
-	sth, err := th.Sign(sm.signer, &sm.namespace)
-	if err != nil {
-		return nil, fmt.Errorf("failed signing tree head: %v", err)
-	}
-	return sth, nil
-}