trie: remove dependency on ethdb

This removes the core/types -> leveldb dependency.

core/state/sync.go

@@ -21,7 +21,6 @@ import (
 	"math/big"
 
 	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/rlp"
 	"github.com/ethereum/go-ethereum/trie"
 )
@@ -32,7 +31,7 @@ import (
 type StateSync trie.TrieSync
 
 // NewStateSync create a new state trie download scheduler.
-func NewStateSync(root common.Hash, database ethdb.Database) *StateSync {
+func NewStateSync(root common.Hash, database trie.DatabaseReader) *StateSync {
 	var syncer *trie.TrieSync
 
 	callback := func(leaf []byte, parent common.Hash) error {
@@ -62,8 +61,8 @@ func (s *StateSync) Missing(max int) []common.Hash {
 // Process injects a batch of retrieved trie nodes data, returning if something
 // was committed to the database and also the index of an entry if processing of
 // it failed.
-func (s *StateSync) Process(list []trie.SyncResult) (bool, int, error) {
-	return (*trie.TrieSync)(s).Process(list)
+func (s *StateSync) Process(list []trie.SyncResult, dbw trie.DatabaseWriter) (bool, int, error) {
+	return (*trie.TrieSync)(s).Process(list, dbw)
 }
 
 // Pending returns the number of state entries currently pending for download.

core/state/sync_test.go

@@ -138,7 +138,7 @@ func testIterativeStateSync(t *testing.T, batch int) {
 			}
 			results[i] = trie.SyncResult{Hash: hash, Data: data}
 		}
-		if _, index, err := sched.Process(results); err != nil {
+		if _, index, err := sched.Process(results, dstDb); err != nil {
 			t.Fatalf("failed to process result #%d: %v", index, err)
 		}
 		queue = append(queue[:0], sched.Missing(batch)...)
@@ -168,7 +168,7 @@ func TestIterativeDelayedStateSync(t *testing.T) {
 			}
 			results[i] = trie.SyncResult{Hash: hash, Data: data}
 		}
-		if _, index, err := sched.Process(results); err != nil {
+		if _, index, err := sched.Process(results, dstDb); err != nil {
 			t.Fatalf("failed to process result #%d: %v", index, err)
 		}
 		queue = append(queue[len(results):], sched.Missing(0)...)
@@ -206,7 +206,7 @@ func testIterativeRandomStateSync(t *testing.T, batch int) {
 			results = append(results, trie.SyncResult{Hash: hash, Data: data})
 		}
 		// Feed the retrieved results back and queue new tasks
-		if _, index, err := sched.Process(results); err != nil {
+		if _, index, err := sched.Process(results, dstDb); err != nil {
 			t.Fatalf("failed to process result #%d: %v", index, err)
 		}
 		queue = make(map[common.Hash]struct{})
@@ -249,7 +249,7 @@ func TestIterativeRandomDelayedStateSync(t *testing.T) {
 			}
 		}
 		// Feed the retrieved results back and queue new tasks
-		if _, index, err := sched.Process(results); err != nil {
+		if _, index, err := sched.Process(results, dstDb); err != nil {
 			t.Fatalf("failed to process result #%d: %v", index, err)
 		}
 		for _, hash := range sched.Missing(0) {
@@ -283,7 +283,7 @@ func TestIncompleteStateSync(t *testing.T) {
 			results[i] = trie.SyncResult{Hash: hash, Data: data}
 		}
 		// Process each of the state nodes
-		if _, index, err := sched.Process(results); err != nil {
+		if _, index, err := sched.Process(results, dstDb); err != nil {
 			t.Fatalf("failed to process result #%d: %v", index, err)
 		}
 		for _, result := range results {

eth/downloader/queue.go

@@ -1123,15 +1123,20 @@ func (q *queue) deliverNodeData(results []trie.SyncResult, callback func(int, bo
 			callback(i, progressed, errNoFetchesPending)
 			return
 		}
-		if prog, _, err := q.stateScheduler.Process([]trie.SyncResult{result}); err != nil {
-			// Processing a state result failed, bail out
+
+		batch := q.stateDatabase.NewBatch()
+		prog, _, err := q.stateScheduler.Process([]trie.SyncResult{result}, batch)
+		if err != nil {
+			q.stateSchedLock.Unlock()
+			callback(i, progressed, err)
+		}
+		if err = batch.Write(); err != nil {
 			q.stateSchedLock.Unlock()
 			callback(i, progressed, err)
-			return
-		} else if prog {
-			progressed = true
 		}
+
 		// Item processing succeeded, release the lock (temporarily)
+		progressed = progressed || prog
 		q.stateSchedLock.Unlock()
 	}
 	callback(len(results), progressed, nil)

trie/sync.go

@@ -21,7 +21,6 @@ import (
 	"fmt"
 
 	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/ethdb"
 	"gopkg.in/karalabe/cookiejar.v2/collections/prque"
 )
 
@@ -58,13 +57,13 @@ type TrieSyncLeafCallback func(leaf []byte, parent common.Hash) error
 // unknown trie hashes to retrieve, accepts node data associated with said hashes
 // and reconstructs the trie step by step until all is done.
 type TrieSync struct {
-	database ethdb.Database           // State database for storing all the assembled node data
+	database DatabaseReader
 	requests map[common.Hash]*request // Pending requests pertaining to a key hash
 	queue    *prque.Prque             // Priority queue with the pending requests
 }
 
 // NewTrieSync creates a new trie data download scheduler.
-func NewTrieSync(root common.Hash, database ethdb.Database, callback TrieSyncLeafCallback) *TrieSync {
+func NewTrieSync(root common.Hash, database DatabaseReader, callback TrieSyncLeafCallback) *TrieSync {
 	ts := &TrieSync{
 		database: database,
 		requests: make(map[common.Hash]*request),
@@ -145,7 +144,7 @@ func (s *TrieSync) Missing(max int) []common.Hash {
 // Process injects a batch of retrieved trie nodes data, returning if something
 // was committed to the database and also the index of an entry if processing of
 // it failed.
-func (s *TrieSync) Process(results []SyncResult) (bool, int, error) {
+func (s *TrieSync) Process(results []SyncResult, dbw DatabaseWriter) (bool, int, error) {
 	committed := false
 
 	for i, item := range results {
@@ -157,7 +156,7 @@ func (s *TrieSync) Process(results []SyncResult) (bool, int, error) {
 		// If the item is a raw entry request, commit directly
 		if request.raw {
 			request.data = item.Data
-			s.commit(request, nil)
+			s.commit(request, dbw)
 			committed = true
 			continue
 		}
@@ -174,7 +173,7 @@ func (s *TrieSync) Process(results []SyncResult) (bool, int, error) {
 			return committed, i, err
 		}
 		if len(requests) == 0 && request.deps == 0 {
-			s.commit(request, nil)
+			s.commit(request, dbw)
 			committed = true
 			continue
 		}
@@ -266,16 +265,9 @@ func (s *TrieSync) children(req *request, object node) ([]*request, error) {
 // commit finalizes a retrieval request and stores it into the database. If any
 // of the referencing parent requests complete due to this commit, they are also
 // committed themselves.
-func (s *TrieSync) commit(req *request, batch ethdb.Batch) (err error) {
-	// Create a new batch if none was specified
-	if batch == nil {
-		batch = s.database.NewBatch()
-		defer func() {
-			err = batch.Write()
-		}()
-	}
+func (s *TrieSync) commit(req *request, dbw DatabaseWriter) (err error) {
 	// Write the node content to disk
-	if err := batch.Put(req.hash[:], req.data); err != nil {
+	if err := dbw.Put(req.hash[:], req.data); err != nil {
 		return err
 	}
 	delete(s.requests, req.hash)
@@ -284,7 +276,7 @@ func (s *TrieSync) commit(req *request, batch ethdb.Batch) (err error) {
 	for _, parent := range req.parents {
 		parent.deps--
 		if parent.deps == 0 {
-			if err := s.commit(parent, batch); err != nil {
+			if err := s.commit(parent, dbw); err != nil {
 				return err
 			}
 		}

trie/sync_test.go

@@ -122,7 +122,7 @@ func testIterativeTrieSync(t *testing.T, batch int) {
 			}
 			results[i] = SyncResult{hash, data}
 		}
-		if _, index, err := sched.Process(results); err != nil {
+		if _, index, err := sched.Process(results, dstDb); err != nil {
 			t.Fatalf("failed to process result #%d: %v", index, err)
 		}
 		queue = append(queue[:0], sched.Missing(batch)...)
@@ -152,7 +152,7 @@ func TestIterativeDelayedTrieSync(t *testing.T) {
 			}
 			results[i] = SyncResult{hash, data}
 		}
-		if _, index, err := sched.Process(results); err != nil {
+		if _, index, err := sched.Process(results, dstDb); err != nil {
 			t.Fatalf("failed to process result #%d: %v", index, err)
 		}
 		queue = append(queue[len(results):], sched.Missing(10000)...)
@@ -190,7 +190,7 @@ func testIterativeRandomTrieSync(t *testing.T, batch int) {
 			results = append(results, SyncResult{hash, data})
 		}
 		// Feed the retrieved results back and queue new tasks
-		if _, index, err := sched.Process(results); err != nil {
+		if _, index, err := sched.Process(results, dstDb); err != nil {
 			t.Fatalf("failed to process result #%d: %v", index, err)
 		}
 		queue = make(map[common.Hash]struct{})
@@ -231,7 +231,7 @@ func TestIterativeRandomDelayedTrieSync(t *testing.T) {
 			}
 		}
 		// Feed the retrieved results back and queue new tasks
-		if _, index, err := sched.Process(results); err != nil {
+		if _, index, err := sched.Process(results, dstDb); err != nil {
 			t.Fatalf("failed to process result #%d: %v", index, err)
 		}
 		for _, result := range results {
@@ -272,7 +272,7 @@ func TestDuplicateAvoidanceTrieSync(t *testing.T) {
 
 			results[i] = SyncResult{hash, data}
 		}
-		if _, index, err := sched.Process(results); err != nil {
+		if _, index, err := sched.Process(results, dstDb); err != nil {
 			t.Fatalf("failed to process result #%d: %v", index, err)
 		}
 		queue = append(queue[:0], sched.Missing(0)...)
@@ -304,7 +304,7 @@ func TestIncompleteTrieSync(t *testing.T) {
 			results[i] = SyncResult{hash, data}
 		}
 		// Process each of the trie nodes
-		if _, index, err := sched.Process(results); err != nil {
+		if _, index, err := sched.Process(results, dstDb); err != nil {
 			t.Fatalf("failed to process result #%d: %v", index, err)
 		}
 		for _, result := range results {

trie/trie.go

@@ -60,8 +60,12 @@ func init() {
 
 // Database must be implemented by backing stores for the trie.
 type Database interface {
+	DatabaseReader
 	DatabaseWriter
-	// Get returns the value for key from the database.
+}
+
+// DatabaseReader wraps the Get method of a backing store for the trie.
+type DatabaseReader interface {
 	Get(key []byte) (value []byte, err error)
 }