trie: remove dependency on ethdb

This removes the core/types -> leveldb dependency.

3 files changed, 19 insertions, 23 deletions

diff --git a/trie/sync.go b/trie/sync.go
index 2158ab750..168501392 100644
--- a/trie/sync.go
+++ b/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
 			}
 		}
diff --git a/trie/sync_test.go b/trie/sync_test.go
index 5292fe5cb..5edbd0746 100644
--- a/trie/sync_test.go
+++ b/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 {
diff --git a/trie/trie.go b/trie/trie.go
index 035a80e74..cd9e20cac 100644
--- a/trie/trie.go
+++ b/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)
 }