From 76c9c8d653ae49e347598f1bbd34c821354c9567 Mon Sep 17 00:00:00 2001
From: obscuren <geffobscura@gmail.com>
Date: Mon, 3 Nov 2014 00:31:15 +0100
Subject: [PATCH] Compress data on db level. Closes #174

---
 ethdb/database.go      | 51 ++++++++++++++++++++++++++++--------------
 ethdb/database_test.go | 26 +++++++++++++++++++--
 state/state_object.go  | 16 ++-----------
 3 files changed, 60 insertions(+), 33 deletions(-)

diff --git a/ethdb/database.go b/ethdb/database.go
index de3afd74b..a59782047 100644
--- a/ethdb/database.go
+++ b/ethdb/database.go
@@ -4,12 +4,15 @@ import (
 	"fmt"
 	"path"
 
+	"github.com/ethereum/go-ethereum/compression/rle"
 	"github.com/ethereum/go-ethereum/ethutil"
 	"github.com/syndtr/goleveldb/leveldb"
+	"github.com/syndtr/goleveldb/leveldb/iterator"
 )
 
 type LDBDatabase struct {
-	db *leveldb.DB
+	db   *leveldb.DB
+	comp bool
 }
 
 func NewLDBDatabase(name string) (*LDBDatabase, error) {
@@ -21,32 +24,42 @@ func NewLDBDatabase(name string) (*LDBDatabase, error) {
 		return nil, err
 	}
 
-	database := &LDBDatabase{db: db}
+	database := &LDBDatabase{db: db, comp: true}
 
 	return database, nil
 }
 
-func (db *LDBDatabase) Put(key []byte, value []byte) {
-	err := db.db.Put(key, value, nil)
+func (self *LDBDatabase) Put(key []byte, value []byte) {
+	if self.comp {
+		value = rle.Compress(value)
+	}
+
+	err := self.db.Put(key, value, nil)
 	if err != nil {
 		fmt.Println("Error put", err)
 	}
 }
 
-func (db *LDBDatabase) Get(key []byte) ([]byte, error) {
-	return db.db.Get(key, nil)
-}
+func (self *LDBDatabase) Get(key []byte) ([]byte, error) {
+	dat, err := self.db.Get(key, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	if self.comp {
+		//fmt.Println("get", dat)
+		return rle.Decompress(dat)
+	}
 
-func (db *LDBDatabase) Delete(key []byte) error {
-	return db.db.Delete(key, nil)
+	return dat, nil
 }
 
-func (db *LDBDatabase) Db() *leveldb.DB {
-	return db.db
+func (self *LDBDatabase) Delete(key []byte) error {
+	return self.db.Delete(key, nil)
 }
 
-func (db *LDBDatabase) LastKnownTD() []byte {
-	data, _ := db.db.Get([]byte("LTD"), nil)
+func (self *LDBDatabase) LastKnownTD() []byte {
+	data, _ := self.Get([]byte("LTD"))
 
 	if len(data) == 0 {
 		data = []byte{0x0}
@@ -55,13 +68,17 @@ func (db *LDBDatabase) LastKnownTD() []byte {
 	return data
 }
 
-func (db *LDBDatabase) Close() {
+func (self *LDBDatabase) NewIterator() iterator.Iterator {
+	return self.db.NewIterator(nil, nil)
+}
+
+func (self *LDBDatabase) Close() {
 	// Close the leveldb database
-	db.db.Close()
+	self.db.Close()
 }
 
-func (db *LDBDatabase) Print() {
-	iter := db.db.NewIterator(nil, nil)
+func (self *LDBDatabase) Print() {
+	iter := self.db.NewIterator(nil, nil)
 	for iter.Next() {
 		key := iter.Key()
 		value := iter.Value()
diff --git a/ethdb/database_test.go b/ethdb/database_test.go
index bb1b4de2a..2cbaf58e0 100644
--- a/ethdb/database_test.go
+++ b/ethdb/database_test.go
@@ -1,6 +1,28 @@
 package ethdb
 
+/*
 import (
-	_ "fmt"
-	_ "testing"
+	"bytes"
+	"testing"
 )
+
+func TestCompression(t *testing.T) {
+	ethutil.ReadConfig("", "/tmp", "")
+
+	db, err := NewLDBDatabase("testdb")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	in := make([]byte, 10)
+	db.Put([]byte("test1"), in)
+	out, err := db.Get([]byte("test1"))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if bytes.Compare(out, in) != 0 {
+		t.Error("put get", in, out)
+	}
+}
+*/
diff --git a/state/state_object.go b/state/state_object.go
index aa5c13678..472aa8389 100644
--- a/state/state_object.go
+++ b/state/state_object.go
@@ -297,23 +297,11 @@ func (self *StateObject) CreateOutputForDiff() {
 
 // State object encoding methods
 func (c *StateObject) RlpEncode() []byte {
-	var root interface{}
-	if c.State != nil {
-		root = c.State.Trie.Root
-	} else {
-		root = ""
-	}
-
-	return ethutil.Encode([]interface{}{c.Nonce, c.balance, root, c.CodeHash()})
+	return ethutil.Encode([]interface{}{c.Nonce, c.balance, c.State.Trie.Root, c.CodeHash()})
 }
 
 func (c *StateObject) CodeHash() ethutil.Bytes {
-	var codeHash []byte
-	if len(c.Code) > 0 {
-		codeHash = crypto.Sha3(c.Code)
-	}
-
-	return codeHash
+	return crypto.Sha3(c.Code)
 }
 
 func (c *StateObject) RlpDecode(data []byte) {