From ee8d406f54bcb7341661724e5df809b6ed8706c2 Mon Sep 17 00:00:00 2001
From: Alexey Akhunov <alexeyakhunov@alexeys-mbp.home>
Date: Mon, 18 Jun 2018 22:10:29 +0100
Subject: [PATCH] Writing Ethereum genesis block and reading from it

---
 Gopkg.lock | 41 +++++++++++++++++++++++++++++++++++++++--
 main.go    | 31 ++++++++++++++++++++++++++-----
 2 files changed, 65 insertions(+), 7 deletions(-)

diff --git a/Gopkg.lock b/Gopkg.lock
index e31f752f..a56d7983 100644
--- a/Gopkg.lock
+++ b/Gopkg.lock
@@ -1,6 +1,12 @@
 # This file is autogenerated, do not edit; changes may be undone by the next 'dep ensure'.
 
 
+[[projects]]
+  branch = "master"
+  name = "github.com/aristanetworks/goarista"
+  packages = ["monotime"]
+  revision = "59944ff78bc1de686b0aba1444dfd380f48f03d4"
+
 [[projects]]
   branch = "master"
   name = "github.com/btcsuite/btcd"
@@ -29,16 +35,28 @@
     "common",
     "common/hexutil",
     "common/math",
+    "common/mclock",
+    "consensus",
+    "consensus/misc",
+    "core",
+    "core/rawdb",
     "core/state",
     "core/types",
+    "core/vm",
     "crypto",
+    "crypto/bn256",
+    "crypto/bn256/cloudflare",
+    "crypto/bn256/google",
     "crypto/secp256k1",
     "crypto/sha3",
     "ethdb",
+    "event",
     "log",
     "metrics",
+    "p2p/netutil",
     "params",
     "rlp",
+    "rpc",
     "trie"
   ]
   revision = "dea1ce052a10cd7d401a5c04f83f371a06fe293c"
@@ -124,6 +142,12 @@
   revision = "645ef00459ed84a119197bfb8d8205042c6df63d"
   version = "v0.8.0"
 
+[[projects]]
+  name = "github.com/rs/cors"
+  packages = ["."]
+  revision = "ca016a06a5753f8ba03029c0aa5e54afb1bf713f"
+  version = "v1.4.0"
+
 [[projects]]
   branch = "master"
   name = "github.com/syndtr/goleveldb"
@@ -214,7 +238,8 @@
     "http2/hpack",
     "idna",
     "internal/timeseries",
-    "trace"
+    "trace",
+    "websocket"
   ]
   revision = "db08ff08e8622530d9ed3a0e8ac279f6d4c02196"
 
@@ -268,15 +293,27 @@
   revision = "5b3c4e850e90a4cf6a20ebd46c8b32a0a3afcb9e"
   version = "v1.7.5"
 
+[[projects]]
+  name = "gopkg.in/fatih/set.v0"
+  packages = ["."]
+  revision = "57907de300222151a123d29255ed17f5ed43fad3"
+  version = "v0.1.0"
+
 [[projects]]
   branch = "v2"
   name = "gopkg.in/karalabe/cookiejar.v2"
   packages = ["collections/prque"]
   revision = "8dcd6a7f4951f6ff3ee9cbb919a06d8925822e57"
 
+[[projects]]
+  branch = "v2"
+  name = "gopkg.in/natefinch/npipe.v2"
+  packages = ["."]
+  revision = "c1b8fa8bdccecb0b8db834ee0b92fdbcfa606dd6"
+
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "405903b5cdec5fe831757bd4289ad96436109112bb3ef41be36992969312e8f1"
+  inputs-digest = "471d91e2c0a3b0b799ddfd79266deb2f4e6e46a1721f9c00680c370f1eb5662f"
   solver-name = "gps-cdcl"
   solver-version = 1
diff --git a/main.go b/main.go
index 4c0c41db..8321e13e 100644
--- a/main.go
+++ b/main.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 
 	eth_common "github.com/ethereum/go-ethereum/common"
+	eth_core "github.com/ethereum/go-ethereum/core"
 	eth_state "github.com/ethereum/go-ethereum/core/state"
 	eth_ethdb "github.com/ethereum/go-ethereum/ethdb"
 	eth_trie "github.com/ethereum/go-ethereum/trie"
@@ -184,9 +185,7 @@ func main() {
 	lookupDb := dbm.NewDB("lookup" /* name */, dbm.MemDBBackend, "" /* dir */)
 	addrPreimageDb := dbm.NewDB("addrPreimage" /* name */, dbm.MemDBBackend, "" /* dir */)
 	codeDb := dbm.NewDB("code" /* name */, dbm.MemDBBackend, "" /* dir */)
-	var d eth_state.Database
-	var err error
-	d, err = OurNewDatabase(stateDb, lookupDb, addrPreimageDb, codeDb)
+	d, err := OurNewDatabase(stateDb, lookupDb, addrPreimageDb, codeDb)
 	if err != nil {
 		panic(err)
 	}
@@ -196,7 +195,29 @@ func main() {
 	if err != nil {
 		panic(err)
 	}
-	// Try something
-	b := statedb.GetBalance(eth_common.HexToAddress("0x829BD824B016326A401d083B33D092293333A830"))
+	g := eth_core.DefaultGenesisBlock()
+	for addr, account := range g.Alloc {
+		statedb.AddBalance(addr, account.Balance)
+		statedb.SetCode(addr, account.Code)
+		statedb.SetNonce(addr, account.Nonce)
+		for key, value := range account.Storage {
+			statedb.SetState(addr, key, value)
+		}
+	}
+
+	// One of the genesis account having 200 ETH
+	b := statedb.GetBalance(eth_common.HexToAddress("0x756F45E3FA69347A9A973A725E3C98bC4db0b5a0"))
 	fmt.Printf("Balance: %s\n", b)
+	root, err := statedb.Commit(false /* deleteEmptyObjects */)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Printf("Genesis state root hash: %x\n", root[:])
+	// Try to create a new statedb from genesis hash
+	genesis_state, err := eth_state.New(root, d)
+	if err != nil {
+		panic(err)
+	}
+	b1 := genesis_state.GetBalance(eth_common.HexToAddress("0x756F45E3FA69347A9A973A725E3C98bC4db0b5a0"))
+	fmt.Printf("Balance reloaded: %s\n", b1)
 }
\ No newline at end of file