ethdb, rpc: support building on js/wasm (#17709)

The changes allow building WebAssembly applications which use ethclient.Client.

6 files changed, 199 insertions, 68 deletions

diff --git a/ethdb/database.go b/ethdb/database.go
index 99abd09b9..6c62d6a38 100644
--- a/ethdb/database.go
+++ b/ethdb/database.go
@@ -14,6 +14,8 @@
 // You should have received a copy of the GNU Lesser General Public License
 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
 
+// +build !js
+
 package ethdb
 
 import (
@@ -380,71 +382,3 @@ func (b *ldbBatch) Reset() {
 	b.b.Reset()
 	b.size = 0
 }
-
-type table struct {
-	db     Database
-	prefix string
-}
-
-// NewTable returns a Database object that prefixes all keys with a given
-// string.
-func NewTable(db Database, prefix string) Database {
-	return &table{
-		db:     db,
-		prefix: prefix,
-	}
-}
-
-func (dt *table) Put(key []byte, value []byte) error {
-	return dt.db.Put(append([]byte(dt.prefix), key...), value)
-}
-
-func (dt *table) Has(key []byte) (bool, error) {
-	return dt.db.Has(append([]byte(dt.prefix), key...))
-}
-
-func (dt *table) Get(key []byte) ([]byte, error) {
-	return dt.db.Get(append([]byte(dt.prefix), key...))
-}
-
-func (dt *table) Delete(key []byte) error {
-	return dt.db.Delete(append([]byte(dt.prefix), key...))
-}
-
-func (dt *table) Close() {
-	// Do nothing; don't close the underlying DB.
-}
-
-type tableBatch struct {
-	batch  Batch
-	prefix string
-}
-
-// NewTableBatch returns a Batch object which prefixes all keys with a given string.
-func NewTableBatch(db Database, prefix string) Batch {
-	return &tableBatch{db.NewBatch(), prefix}
-}
-
-func (dt *table) NewBatch() Batch {
-	return &tableBatch{dt.db.NewBatch(), dt.prefix}
-}
-
-func (tb *tableBatch) Put(key, value []byte) error {
-	return tb.batch.Put(append([]byte(tb.prefix), key...), value)
-}
-
-func (tb *tableBatch) Delete(key []byte) error {
-	return tb.batch.Delete(append([]byte(tb.prefix), key...))
-}
-
-func (tb *tableBatch) Write() error {
-	return tb.batch.Write()
-}
-
-func (tb *tableBatch) ValueSize() int {
-	return tb.batch.ValueSize()
-}
-
-func (tb *tableBatch) Reset() {
-	tb.batch.Reset()
-}
diff --git a/ethdb/database_js.go b/ethdb/database_js.go
new file mode 100644
index 000000000..ba6eeb5a2
--- /dev/null
+++ b/ethdb/database_js.go
@@ -0,0 +1,68 @@
+// Copyright 2014 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// +build js
+
+package ethdb
+
+import (
+	"errors"
+)
+
+var errNotSupported = errors.New("ethdb: not supported")
+
+type LDBDatabase struct {
+}
+
+// NewLDBDatabase returns a LevelDB wrapped object.
+func NewLDBDatabase(file string, cache int, handles int) (*LDBDatabase, error) {
+	return nil, errNotSupported
+}
+
+// Path returns the path to the database directory.
+func (db *LDBDatabase) Path() string {
+	return ""
+}
+
+// Put puts the given key / value to the queue
+func (db *LDBDatabase) Put(key []byte, value []byte) error {
+	return errNotSupported
+}
+
+func (db *LDBDatabase) Has(key []byte) (bool, error) {
+	return false, errNotSupported
+}
+
+// Get returns the given key if it's present.
+func (db *LDBDatabase) Get(key []byte) ([]byte, error) {
+	return nil, errNotSupported
+}
+
+// Delete deletes the key from the queue and database
+func (db *LDBDatabase) Delete(key []byte) error {
+	return errNotSupported
+}
+
+func (db *LDBDatabase) Close() {
+}
+
+// Meter configures the database metrics collectors and
+func (db *LDBDatabase) Meter(prefix string) {
+}
+
+func (db *LDBDatabase) NewBatch() Batch {
+	return nil
+}
diff --git a/ethdb/database_js_test.go b/ethdb/database_js_test.go
new file mode 100644
index 000000000..b4c12ae0b
--- /dev/null
+++ b/ethdb/database_js_test.go
@@ -0,0 +1,25 @@
+// Copyright 2014 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// +build js
+
+package ethdb_test
+
+import (
+	"github.com/ethereum/go-ethereum/ethdb"
+)
+
+var _ ethdb.Database = &ethdb.LDBDatabase{}
diff --git a/ethdb/database_test.go b/ethdb/database_test.go
index 74675cbe6..382fedbf9 100644
--- a/ethdb/database_test.go
+++ b/ethdb/database_test.go
@@ -14,6 +14,8 @@
 // You should have received a copy of the GNU Lesser General Public License
 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
 
+// +build !js
+
 package ethdb_test
 
 import (
diff --git a/ethdb/table.go b/ethdb/table.go
new file mode 100644
index 000000000..28069c078
--- /dev/null
+++ b/ethdb/table.go
@@ -0,0 +1,51 @@
+// Copyright 2014 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package ethdb
+
+type table struct {
+	db     Database
+	prefix string
+}
+
+// NewTable returns a Database object that prefixes all keys with a given
+// string.
+func NewTable(db Database, prefix string) Database {
+	return &table{
+		db:     db,
+		prefix: prefix,
+	}
+}
+
+func (dt *table) Put(key []byte, value []byte) error {
+	return dt.db.Put(append([]byte(dt.prefix), key...), value)
+}
+
+func (dt *table) Has(key []byte) (bool, error) {
+	return dt.db.Has(append([]byte(dt.prefix), key...))
+}
+
+func (dt *table) Get(key []byte) ([]byte, error) {
+	return dt.db.Get(append([]byte(dt.prefix), key...))
+}
+
+func (dt *table) Delete(key []byte) error {
+	return dt.db.Delete(append([]byte(dt.prefix), key...))
+}
+
+func (dt *table) Close() {
+	// Do nothing; don't close the underlying DB.
+}
diff --git a/ethdb/table_batch.go b/ethdb/table_batch.go
new file mode 100644
index 000000000..ae83e79ce
--- /dev/null
+++ b/ethdb/table_batch.go
@@ -0,0 +1,51 @@
+// Copyright 2014 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package ethdb
+
+type tableBatch struct {
+	batch  Batch
+	prefix string
+}
+
+// NewTableBatch returns a Batch object which prefixes all keys with a given string.
+func NewTableBatch(db Database, prefix string) Batch {
+	return &tableBatch{db.NewBatch(), prefix}
+}
+
+func (dt *table) NewBatch() Batch {
+	return &tableBatch{dt.db.NewBatch(), dt.prefix}
+}
+
+func (tb *tableBatch) Put(key, value []byte) error {
+	return tb.batch.Put(append([]byte(tb.prefix), key...), value)
+}
+
+func (tb *tableBatch) Delete(key []byte) error {
+	return tb.batch.Delete(append([]byte(tb.prefix), key...))
+}
+
+func (tb *tableBatch) Write() error {
+	return tb.batch.Write()
+}
+
+func (tb *tableBatch) ValueSize() int {
+	return tb.batch.ValueSize()
+}
+
+func (tb *tableBatch) Reset() {
+	tb.batch.Reset()
+}