Update BlockChain to record NodeInfo (#95)

Gopkg.lock

@@ -13,23 +13,29 @@
   packages = ["."]
   revision = "4748e29d5718c2df4028a6543edf86fd8cc0f881"
 
+[[projects]]
+  branch = "master"
+  name = "github.com/aristanetworks/goarista"
+  packages = ["monotime"]
+  revision = "8d0e8f607a4080e7df3532e645440ed0900c64a4"
+
 [[projects]]
   branch = "master"
   name = "github.com/btcsuite/btcd"
   packages = ["btcec"]
-  revision = "c7588cbf7690cd9f047a28efa2dcd8f2435a4e5e"
+  revision = "2e60448ffcc6bf78332d1fe590260095f554dd78"
 
 [[projects]]
   name = "github.com/ethereum/go-ethereum"
-  packages = [".","accounts/abi","common","common/hexutil","common/math","core/types","crypto","crypto/secp256k1","crypto/sha3","ethclient","log","params","rlp","rpc","trie"]
-  revision = "1db4ecdc0b9e828ff65777fb466fc7c1d04e0de9"
-  version = "v1.7.2"
+  packages = [".","accounts/abi","common","common/hexutil","common/math","common/mclock","core/types","crypto","crypto/ecies","crypto/secp256k1","crypto/sha3","ethclient","event","log","metrics","p2p","p2p/discover","p2p/discv5","p2p/nat","p2p/netutil","params","rlp","rpc","trie"]
+  revision = "4bb3c89d44e372e6a9ab85a8be0c9345265c763a"
+  version = "v1.7.3"
 
 [[projects]]
   name = "github.com/go-stack/stack"
   packages = ["."]
-  revision = "817915b46b97fd7bb80e8ab6b69f01a53ac3eebf"
-  version = "v1.6.0"
+  revision = "259ab82a6cad3992b4e21ff5cac294ccb06474bc"
+  version = "v1.7.0"
 
 [[projects]]
   branch = "master"
@@ -37,23 +43,41 @@
   packages = ["proto"]
   revision = "1e59b77b52bf8e4b449a57e6f79f21226d571845"
 
+[[projects]]
+  branch = "master"
+  name = "github.com/golang/snappy"
+  packages = ["."]
+  revision = "553a641470496b2327abcac10b36396bd98e45c9"
+
 [[projects]]
   branch = "master"
   name = "github.com/howeyc/gopass"
   packages = ["."]
   revision = "bf9dde6d0d2c004a008c27aaee91170c786f6db8"
 
+[[projects]]
+  branch = "master"
+  name = "github.com/huin/goupnp"
+  packages = [".","dcps/internetgateway1","dcps/internetgateway2","httpu","scpd","soap","ssdp"]
+  revision = "dceda08e705b2acee36aab47d765ed801f64cfc7"
+
+[[projects]]
+  name = "github.com/jackpal/go-nat-pmp"
+  packages = ["."]
+  revision = "c9cfead9f2a36ddf3daa40ba269aa7f4bbba6b62"
+  version = "v1.0.1"
+
 [[projects]]
   branch = "master"
   name = "github.com/jmoiron/sqlx"
   packages = [".","reflectx"]
-  revision = "3379e5993990b1f927fc8db926485e6f6becf2d2"
+  revision = "99f3ad6d85ae53d0fecf788ab62d0e9734b3c117"
 
 [[projects]]
   branch = "master"
   name = "github.com/lib/pq"
   packages = [".","oid"]
-  revision = "b609790bd85edf8e9ab7e0f8912750a786177bcf"
+  revision = "83612a56d3dd153a94a629cd64925371c9adad78"
 
 [[projects]]
   name = "github.com/mattn/go-colorable"
@@ -112,8 +136,8 @@
 [[projects]]
   branch = "master"
   name = "github.com/rcrowley/go-metrics"
-  packages = ["."]
-  revision = "1f30fe9094a513ce4c700b9a54458bbb0c96996c"
+  packages = [".","exp"]
+  revision = "e181e095bae94582363434144c61a9653aff6e50"
 
 [[projects]]
   name = "github.com/rs/cors"
@@ -121,29 +145,35 @@
   revision = "7af7a1e09ba336d2ea14b1ce73bf693c6837dbf6"
   version = "v1.2"
 
+[[projects]]
+  branch = "master"
+  name = "github.com/syndtr/goleveldb"
+  packages = ["leveldb","leveldb/cache","leveldb/comparer","leveldb/errors","leveldb/filter","leveldb/iterator","leveldb/journal","leveldb/memdb","leveldb/opt","leveldb/storage","leveldb/table","leveldb/util"]
+  revision = "adf24ef3f94bd13ec4163060b21a5678f22b429b"
+
 [[projects]]
   branch = "master"
   name = "golang.org/x/crypto"
   packages = ["ssh/terminal"]
-  revision = "bd6f299fb381e4c3393d1c4b1f0b94f5e77650c8"
+  revision = "94eea52f7b742c7cbe0b03b22f0c4c8631ece122"
 
 [[projects]]
   branch = "master"
   name = "golang.org/x/net"
   packages = ["context","html","html/atom","html/charset","websocket"]
-  revision = "1087133bc4af3073e18add999345c6ae75918503"
+  revision = "faacc1b5e36e3ff02cbec9661c69ac63dd5a83ad"
 
 [[projects]]
   branch = "master"
   name = "golang.org/x/sys"
   packages = ["unix","windows"]
-  revision = "8dbc5d05d6edcc104950cc299a1ce6641235bc86"
+  revision = "a0f4589a76f1f83070cb9e5613809e1d07b97c13"
 
 [[projects]]
   branch = "master"
   name = "golang.org/x/text"
   packages = ["encoding","encoding/charmap","encoding/htmlindex","encoding/internal","encoding/internal/identifier","encoding/japanese","encoding/korean","encoding/simplifiedchinese","encoding/traditionalchinese","encoding/unicode","internal/gen","internal/tag","internal/utf8internal","language","runes","transform","unicode/cldr"]
-  revision = "c01e4764d870b77f8abe5096ee19ad20d80e8075"
+  revision = "be25de41fadfae372d6470bda81ca6beb55ef551"
 
 [[projects]]
   name = "gopkg.in/fatih/set.v0"
@@ -173,11 +203,11 @@
   branch = "v2"
   name = "gopkg.in/yaml.v2"
   packages = ["."]
-  revision = "eb3733d160e74a9c7e442f435eb3bea458e1d19f"
+  revision = "287cf08546ab5e7e37d55a84f7ed3fd1db036de5"
 
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "90af18ee127c0b2099f47adc5d33fb6ce9b98630278ec66648ef3e1c5ad9063f"
+  inputs-digest = "9b993b03db46de97fde5cfe8022a60d1654172dcb7d63c2c4b876308ffd1f73e"
   solver-name = "gps-cdcl"
   solver-version = 1

cmd/populate_blocks/main.go

@@ -16,7 +16,7 @@ func main() {
 	flag.Parse()
 	config := cmd.LoadConfig(*environment)
 	blockchain := geth.NewGethBlockchain(config.Client.IPCPath)
-	repository := cmd.LoadPostgres(config.Database)
+	repository := cmd.LoadPostgres(config.Database, blockchain.Node())
 	numberOfBlocksCreated := history.PopulateBlocks(blockchain, repository, int64(*startingBlockNumber))
 	fmt.Printf("Populated %d blocks", numberOfBlocksCreated)
 }

cmd/run/main.go

@@ -16,10 +16,11 @@ func main() {
 	environment := flag.String("environment", "", "Environment name")
 	flag.Parse()
 	config := cmd.LoadConfig(*environment)
-	repository := cmd.LoadPostgres(config.Database)
 	fmt.Printf("Creating Geth Blockchain to: %s\n", config.Client.IPCPath)
+	blockchain := geth.NewGethBlockchain(config.Client.IPCPath)
+	repository := cmd.LoadPostgres(config.Database, blockchain.Node())
 	listener := blockchain_listener.NewBlockchainListener(
-		geth.NewGethBlockchain(config.Client.IPCPath),
+		blockchain,
 		[]core.BlockchainObserver{
 			observers.BlockchainLoggingObserver{},
 			observers.NewBlockchainDbObserver(repository),

cmd/show_contract_summary/main.go

@@ -21,7 +21,7 @@ func main() {
 	flag.Parse()
 	config := cmd.LoadConfig(*environment)
 	blockchain := geth.NewGethBlockchain(config.Client.IPCPath)
-	repository := cmd.LoadPostgres(config.Database)
+	repository := cmd.LoadPostgres(config.Database, blockchain.Node())
 	blockNumber := requestedBlockNumber(_blockNumber)
 
 	contractSummary, err := contract_summary.NewSummary(blockchain, repository, *contractHash, blockNumber)

cmd/subscribe_contract/main.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/8thlight/vulcanizedb/cmd"
 	"github.com/8thlight/vulcanizedb/pkg/core"
+	"github.com/8thlight/vulcanizedb/pkg/geth"
 )
 
 func main() {
@@ -15,7 +16,8 @@ func main() {
 
 	contractAbiString := cmd.GetAbi(*abiFilepath, *contractHash)
 	config := cmd.LoadConfig(*environment)
-	repository := cmd.LoadPostgres(config.Database)
+	blockchain := geth.NewGethBlockchain(config.Client.IPCPath)
+	repository := cmd.LoadPostgres(config.Database, blockchain.Node())
 	watchedContract := core.Contract{
 		Abi:  contractAbiString,
 		Hash: *contractHash,

cmd/utils.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 
 	"github.com/8thlight/vulcanizedb/pkg/config"
+	"github.com/8thlight/vulcanizedb/pkg/core"
 	"github.com/8thlight/vulcanizedb/pkg/geth"
 	"github.com/8thlight/vulcanizedb/pkg/repositories"
 )
@@ -20,8 +21,8 @@ func LoadConfig(environment string) config.Config {
 	return cfg
 }
 
-func LoadPostgres(database config.Database) repositories.Postgres {
-	repository, err := repositories.NewPostgres(database)
+func LoadPostgres(database config.Database, node core.Node) repositories.Postgres {
+	repository, err := repositories.NewPostgres(database, node)
 	if err != nil {
 		log.Fatalf("Error loading postgres\n%v", err)
 	}

db/migrations/1512504078_add_nodes_table.down.sql

@@ -0,0 +1 @@
+DROP TABLE nodes;

db/migrations/1512504078_add_nodes_table.up.sql

@@ -0,0 +1,6 @@
+CREATE TABLE nodes (
+  id            SERIAL PRIMARY KEY,
+  genesis_block VARCHAR(66),
+  network_id NUMERIC,
+  CONSTRAINT node_uc UNIQUE (genesis_block, network_id)
+);

db/migrations/1512507280_add_node_fk_to_blocks.down.sql

@@ -0,0 +1,2 @@
+ALTER TABLE blocks
+  DROP COLUMN node_id;

db/migrations/1512507280_add_node_fk_to_blocks.up.sql

@@ -0,0 +1,5 @@
+ALTER TABLE blocks
+  ADD COLUMN node_id INTEGER NOT NULL,
+  ADD CONSTRAINT node_fk
+FOREIGN KEY (node_id)
+REFERENCES nodes (id);

db/schema.sql

@@ -49,7 +49,8 @@ CREATE TABLE blocks (
     block_nonce character varying(20),
     block_parenthash character varying(66),
     block_size bigint,
-    uncle_hash character varying(66)
+    uncle_hash character varying(66),
+    node_id integer NOT NULL
 );
 
 
@@ -72,6 +73,36 @@ CREATE SEQUENCE blocks_id_seq
 ALTER SEQUENCE blocks_id_seq OWNED BY blocks.id;
 
 
+--
+-- Name: nodes; Type: TABLE; Schema: public; Owner: -
+--
+
+CREATE TABLE nodes (
+    id integer NOT NULL,
+    genesis_block character varying(66),
+    network_id numeric
+);
+
+
+--
+-- Name: nodes_id_seq; Type: SEQUENCE; Schema: public; Owner: -
+--
+
+CREATE SEQUENCE nodes_id_seq
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+
+--
+-- Name: nodes_id_seq; Type: SEQUENCE OWNED BY; Schema: public; Owner: -
+--
+
+ALTER SEQUENCE nodes_id_seq OWNED BY nodes.id;
+
+
 --
 -- Name: schema_migrations; Type: TABLE; Schema: public; Owner: -
 --
@@ -155,6 +186,13 @@ ALTER SEQUENCE watched_contracts_contract_id_seq OWNED BY watched_contracts.cont
 ALTER TABLE ONLY blocks ALTER COLUMN id SET DEFAULT nextval('blocks_id_seq'::regclass);
 
 
+--
+-- Name: nodes id; Type: DEFAULT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY nodes ALTER COLUMN id SET DEFAULT nextval('nodes_id_seq'::regclass);
+
+
 --
 -- Name: transactions id; Type: DEFAULT; Schema: public; Owner: -
 --
@@ -185,6 +223,22 @@ ALTER TABLE ONLY watched_contracts
     ADD CONSTRAINT contract_hash_uc UNIQUE (contract_hash);
 
 
+--
+-- Name: nodes node_uc; Type: CONSTRAINT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY nodes
+    ADD CONSTRAINT node_uc UNIQUE (genesis_block, network_id);
+
+
+--
+-- Name: nodes nodes_pkey; Type: CONSTRAINT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY nodes
+    ADD CONSTRAINT nodes_pkey PRIMARY KEY (id);
+
+
 --
 -- Name: schema_migrations schema_migrations_pkey; Type: CONSTRAINT; Schema: public; Owner: -
 --
@@ -224,6 +278,14 @@ ALTER TABLE ONLY transactions
     ADD CONSTRAINT fk_test FOREIGN KEY (block_id) REFERENCES blocks(id);
 
 
+--
+-- Name: blocks node_fk; Type: FK CONSTRAINT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY blocks
+    ADD CONSTRAINT node_fk FOREIGN KEY (node_id) REFERENCES nodes(id);
+
+
 --
 -- PostgreSQL database dump complete
 --

integration_test/geth_blockchain_test.go

@@ -54,4 +54,15 @@ var _ = Describe("Reading from the Geth blockchain", func() {
 		close(done)
 	}, 15)
 
+	It("retrieves the node info", func(done Done) {
+		node := blockchain.Node()
+		devNetworkGenesisBlock := "0xe5be92145a301820111f91866566e3e99ee344d155569e4556a39bc71238f3bc"
+		devNetworkNodeId := float64(1)
+
+		Expect(node.GenesisBlock).To(Equal(devNetworkGenesisBlock))
+		Expect(node.NetworkId).To(Equal(devNetworkNodeId))
+
+		close(done)
+	}, 15)
+
 })

pkg/core/blockchain.go

@@ -4,6 +4,7 @@ import "math/big"
 
 type Blockchain interface {
 	GetBlockByNumber(blockNumber int64) Block
+	Node() Node
 	SubscribeToBlocks(blocks chan Block)
 	StartListening()
 	StopListening()

pkg/core/node_info.go

@@ -0,0 +1,6 @@
+package core
+
+type Node struct {
+	GenesisBlock string
+	NetworkId    float64
+}

pkg/fakes/blockchain.go

@@ -13,6 +13,11 @@ type Blockchain struct {
 	contractAttributes map[string]map[string]string
 	blocksChannel      chan core.Block
 	WasToldToStop      bool
+	node               core.Node
+}
+
+func (blockchain *Blockchain) Node() core.Node {
+	return blockchain.node
 }
 
 func (blockchain *Blockchain) GetAttribute(contract core.Contract, attributeName string, blockNumber *big.Int) (interface{}, error) {
@@ -29,6 +34,7 @@ func NewBlockchain() *Blockchain {
 	return &Blockchain{
 		blocks:             make(map[int64]core.Block),
 		contractAttributes: make(map[string]map[string]string),
+		node:               core.Node{GenesisBlock: "GENESIS"},
 	}
 }
 

pkg/geth/geth_blockchain.go

@@ -6,9 +6,11 @@ import (
 	"math/big"
 
 	"github.com/8thlight/vulcanizedb/pkg/core"
+	"github.com/8thlight/vulcanizedb/pkg/geth/node"
 	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/ethclient"
+	"github.com/ethereum/go-ethereum/rpc"
 	"golang.org/x/net/context"
 )
 
@@ -17,6 +19,11 @@ type GethBlockchain struct {
 	readGethHeaders     chan *types.Header
 	outputBlocks        chan core.Block
 	newHeadSubscription ethereum.Subscription
+	node                core.Node
+}
+
+func (blockchain *GethBlockchain) Node() core.Node {
+	return blockchain.node
 }
 
 func (blockchain *GethBlockchain) GetBlockByNumber(blockNumber int64) core.Block {
@@ -26,7 +33,9 @@ func (blockchain *GethBlockchain) GetBlockByNumber(blockNumber int64) core.Block
 
 func NewGethBlockchain(ipcPath string) *GethBlockchain {
 	blockchain := GethBlockchain{}
-	client, _ := ethclient.Dial(ipcPath)
+	rpcClient, _ := rpc.Dial(ipcPath)
+	client := ethclient.NewClient(rpcClient)
+	blockchain.node = node.Retrieve(rpcClient)
 	blockchain.client = client
 	return &blockchain
 }

pkg/geth/node/node.go

@@ -0,0 +1,32 @@
+package node
+
+import (
+	"context"
+
+	"github.com/8thlight/vulcanizedb/pkg/core"
+	"github.com/ethereum/go-ethereum/p2p"
+	"github.com/ethereum/go-ethereum/rpc"
+)
+
+func Retrieve(client *rpc.Client) core.Node {
+	var info p2p.NodeInfo
+	node := core.Node{}
+	client.CallContext(context.Background(), &info, "admin_nodeInfo")
+	for protocolName, protocol := range info.Protocols {
+		if protocolName == "eth" {
+			protocolMap, _ := protocol.(map[string]interface{})
+			node.GenesisBlock = getAttribute(protocolMap, "genesis").(string)
+			node.NetworkId = getAttribute(protocolMap, "network").(float64)
+		}
+	}
+	return node
+}
+
+func getAttribute(protocolMap map[string]interface{}, protocol string) interface{} {
+	for key, val := range protocolMap {
+		if key == protocol {
+			return val
+		}
+	}
+	return nil
+}

pkg/repositories/in_memory_test.go

@@ -1,6 +1,7 @@
 package repositories_test
 
 import (
+	"github.com/8thlight/vulcanizedb/pkg/core"
 	"github.com/8thlight/vulcanizedb/pkg/repositories"
 	"github.com/8thlight/vulcanizedb/pkg/repositories/testing"
 	_ "github.com/lib/pq"
@@ -9,7 +10,7 @@ import (
 
 var _ = Describe("In memory repository", func() {
 
-	testing.AssertRepositoryBehavior(func() repositories.Repository {
+	testing.AssertRepositoryBehavior(func(core.Node) repositories.Repository {
 		return repositories.NewInMemory()
 	})
 

pkg/repositories/postgres.go

@@ -14,21 +14,46 @@ import (
 )
 
 type Postgres struct {
-	Db *sqlx.DB
+	Db     *sqlx.DB
+	node   core.Node
+	nodeId int64
 }
 
 var (
 	ErrDBInsertFailed     = errors.New("postgres: insert failed")
 	ErrDBConnectionFailed = errors.New("postgres: db connection failed")
+	ErrUnableToSetNode    = errors.New("postgres: unable to set node")
 )
 
-func NewPostgres(databaseConfig config.Database) (Postgres, error) {
+func NewPostgres(databaseConfig config.Database, node core.Node) (Postgres, error) {
 	connectString := config.DbConnectionString(databaseConfig)
 	db, err := sqlx.Connect("postgres", connectString)
 	if err != nil {
 		return Postgres{}, ErrDBConnectionFailed
 	}
-	return Postgres{Db: db}, nil
+	pg := Postgres{Db: db, node: node}
+	err = pg.CreateNode(&node)
+	if err != nil {
+		return Postgres{}, ErrUnableToSetNode
+	}
+	return pg, nil
+}
+
+func (repository *Postgres) CreateNode(node *core.Node) error {
+	var nodeId int64
+	err := repository.Db.QueryRow(
+		`INSERT INTO nodes (genesis_block, network_id)
+                VALUES ($1, $2)
+                ON CONFLICT (genesis_block, network_id)
+                  DO UPDATE
+                    SET genesis_block = $1, network_id = $2
+                RETURNING id`,
+		node.GenesisBlock, node.NetworkId).Scan(&nodeId)
+	if err != nil {
+		return ErrUnableToSetNode
+	}
+	repository.nodeId = nodeId
+	return nil
 }
 
 func (repository Postgres) CreateContract(contract core.Contract) error {
@@ -53,7 +78,8 @@ func (repository Postgres) CreateContract(contract core.Contract) error {
 func (repository Postgres) ContractExists(contractHash string) bool {
 	var exists bool
 	repository.Db.QueryRow(
-		`SELECT exists(SELECT 1 FROM watched_contracts WHERE contract_hash=$1) FROM watched_contracts`, contractHash).Scan(&exists)
+		`SELECT exists(SELECT 1 FROM watched_contracts WHERE contract_hash=$1)
+                FROM watched_contracts`, contractHash).Scan(&exists)
 	return exists
 }
 
@@ -92,7 +118,9 @@ func (repository Postgres) MissingBlockNumbers(startingBlockNumber int64, highes
 
 func (repository Postgres) FindBlockByNumber(blockNumber int64) *core.Block {
 	blockRows, _ := repository.Db.Query(
-		`SELECT id, block_number, block_gaslimit, block_gasused, block_time, block_difficulty, block_hash, block_nonce, block_parenthash, block_size, uncle_hash FROM blocks`)
+		`SELECT id, block_number, block_gaslimit, block_gasused, block_time, block_difficulty, block_hash, block_nonce, block_parenthash, block_size, uncle_hash
+				FROM blocks
+				WHERE node_id = $1`, repository.nodeId)
 	var savedBlocks []core.Block
 	for blockRows.Next() {
 		savedBlock := repository.loadBlock(blockRows)
@@ -116,10 +144,10 @@ func (repository Postgres) CreateBlock(block core.Block) error {
 	var blockId int64
 	err := tx.QueryRow(
 		`INSERT INTO blocks
-			(block_number, block_gaslimit, block_gasused, block_time, block_difficulty, block_hash, block_nonce, block_parenthash, block_size, uncle_hash)
-			VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10)
-		RETURNING id `,
-		block.Number, block.GasLimit, block.GasUsed, block.Time, block.Difficulty, block.Hash, block.Nonce, block.ParentHash, block.Size, block.UncleHash).
+			    (node_id, block_number, block_gaslimit, block_gasused, block_time, block_difficulty, block_hash, block_nonce, block_parenthash, block_size, uncle_hash)
+			    VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11)
+		        RETURNING id `,
+		repository.nodeId, block.Number, block.GasLimit, block.GasUsed, block.Time, block.Difficulty, block.Hash, block.Nonce, block.ParentHash, block.Size, block.UncleHash).
 		Scan(&blockId)
 	if err != nil {
 		tx.Rollback()
@@ -138,8 +166,8 @@ func (repository Postgres) createTransactions(tx *sql.Tx, blockId int64, transac
 	for _, transaction := range transactions {
 		_, err := tx.Exec(
 			`INSERT INTO transactions
-			(block_id, tx_hash, tx_nonce, tx_to, tx_from, tx_gaslimit, tx_gasprice, tx_value)
-			VALUES ($1, $2, $3, $4, $5, $6, $7, $8)`,
+           (block_id, tx_hash, tx_nonce, tx_to, tx_from, tx_gaslimit, tx_gasprice, tx_value)
+           VALUES ($1, $2, $3, $4, $5, $6, $7, $8)`,
 			blockId, transaction.Hash, transaction.Nonce, transaction.To, transaction.From, transaction.GasLimit, transaction.GasPrice, transaction.Value)
 		if err != nil {
 			return err
@@ -204,7 +232,7 @@ func (repository Postgres) loadTransactions(transactionRows *sql.Rows) []core.Tr
 }
 
 func (repository Postgres) addTransactions(contract core.Contract) core.Contract {
-	transactionRows, _ := repository.Db.Query(`SELECT tx_hash, tx_nonce, tx_to, tx_from, tx_gaslimit, tx_gasprice, tx_value FROM transactions WHERE tx_to = $1 ORDER BY block_id desc`, contract.Hash)
+	transactionRows, _ := repository.Db.Query(`SELECT tx_hash, tx_nonce, tx_to, tx_from, tx_gaslimit, tx_gasprice, tx_value FROM transactions WHERE tx_to = $1 ORDER BY block_id DESC`, contract.Hash)
 	transactions := repository.loadTransactions(transactionRows)
 	savedContract := core.Contract{Hash: contract.Hash, Transactions: transactions, Abi: contract.Abi}
 	return savedContract

pkg/repositories/postgres_test.go

@@ -24,9 +24,9 @@ var _ = Describe("Postgres repository", func() {
 		Expect(db).ShouldNot(BeNil())
 	})
 
-	testing.AssertRepositoryBehavior(func() repositories.Repository {
+	testing.AssertRepositoryBehavior(func(node core.Node) repositories.Repository {
 		cfg, _ := config.NewConfig("private")
-		repository, _ := repositories.NewPostgres(cfg.Database)
+		repository, _ := repositories.NewPostgres(cfg.Database, node)
 		testing.ClearData(repository)
 		return repository
 	})
@@ -40,7 +40,8 @@ var _ = Describe("Postgres repository", func() {
 			Transactions: []core.Transaction{},
 		}
 		cfg, _ := config.NewConfig("private")
-		repository, _ := repositories.NewPostgres(cfg.Database)
+		node := core.Node{GenesisBlock: "GENESIS", NetworkId: 1}
+		repository, _ := repositories.NewPostgres(cfg.Database, node)
 
 		err := repository.CreateBlock(badBlock)
 		savedBlock := repository.FindBlockByNumber(123)
@@ -51,10 +52,19 @@ var _ = Describe("Postgres repository", func() {
 
 	It("throws error when can't connect to the database", func() {
 		invalidDatabase := config.Database{}
-		_, err := repositories.NewPostgres(invalidDatabase)
+		node := core.Node{GenesisBlock: "GENESIS", NetworkId: 1}
+		_, err := repositories.NewPostgres(invalidDatabase, node)
 		Expect(err).To(Equal(repositories.ErrDBConnectionFailed))
 	})
 
+	It("throws error when can't create node", func() {
+		cfg, _ := config.NewConfig("private")
+		badHash := fmt.Sprintf("x %s", strings.Repeat("1", 100))
+		node := core.Node{GenesisBlock: badHash, NetworkId: 1}
+		_, err := repositories.NewPostgres(cfg.Database, node)
+		Expect(err).To(Equal(repositories.ErrUnableToSetNode))
+	})
+
 	It("does not commit block or transactions if transaction is invalid", func() {
 		//badHash violates db To field length
 		badHash := fmt.Sprintf("x %s", strings.Repeat("1", 100))
@@ -64,7 +74,8 @@ var _ = Describe("Postgres repository", func() {
 			Transactions: []core.Transaction{badTransaction},
 		}
 		cfg, _ := config.NewConfig("private")
-		repository, _ := repositories.NewPostgres(cfg.Database)
+		node := core.Node{GenesisBlock: "GENESIS", NetworkId: 1}
+		repository, _ := repositories.NewPostgres(cfg.Database, node)
 
 		err := repository.CreateBlock(block)
 		savedBlock := repository.FindBlockByNumber(123)

pkg/repositories/testing/helpers.go

@@ -13,11 +13,12 @@ func ClearData(postgres repositories.Postgres) {
 	postgres.Db.MustExec("DELETE FROM blocks")
 }
 
-func AssertRepositoryBehavior(buildRepository func() repositories.Repository) {
+func AssertRepositoryBehavior(buildRepository func(node core.Node) repositories.Repository) {
 	var repository repositories.Repository
 
 	BeforeEach(func() {
-		repository = buildRepository()
+		node := core.Node{GenesisBlock: "GENESIS", NetworkId: 1}
+		repository = buildRepository(node)
 	})
 
 	Describe("Saving blocks", func() {
@@ -34,6 +35,21 @@ func AssertRepositoryBehavior(buildRepository func() repositories.Repository) {
 			Expect(repository.BlockCount()).To(Equal(1))
 		})
 
+		It("associates blocks to a node", func() {
+			block := core.Block{
+				Number: 123,
+			}
+			repository.CreateBlock(block)
+			nodeTwo := core.Node{
+				GenesisBlock: "0x456",
+				NetworkId:    1,
+			}
+			repositoryTwo := buildRepository(nodeTwo)
+
+			foundBlock := repositoryTwo.FindBlockByNumber(123)
+			Expect(foundBlock).To(BeNil())
+		})
+
 		It("saves the attributes of the block", func() {
 			blockNumber := int64(123)
 			gasLimit := int64(1000000)