Merge branch 'master' of https://github.com/CityOfZion/neo-go

.gitignore

@@ -0,0 +1,18 @@
+# Binaries for programs and plugins
+*.exe
+*.dll
+*.so
+*.dylib
+
+# Test binary, build with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Project-local glide cache, RE: https://github.com/Masterminds/glide/issues/736
+.glide/
+
+# Added by CoZ developers
+vendor/
+bin/

Makefile

@@ -0,0 +1,23 @@
+BRANCH = "master"
+VERSION = $(shell cat ./VERSION)
+
+build:
+	@go build -o ./bin/neo-go ./cli/main.go
+
+check-version:
+	git fetch && (! git rev-list ${VERSION})
+
+deps:
+	@glide install
+
+push-tag:
+	git checkout ${BRANCH}
+	git pull origin ${BRANCH}
+	git tag ${VERSION}
+	git push origin ${BRANCH} --tags
+
+test:
+	@go test $(shell glide nv) -cover
+
+vet:
+	@go vet $(shell glide nv)

README.md

@@ -5,10 +5,10 @@
   >
 </p>
 
-<h1 align="center">NEO-GO</h1>
+<h1 align="center">neo-go</h1>
 
 <p align="center">
-  Node and SDK for the <b>NEO</b> blockchain written in the <b>Go</b> language.
+  <b>Go</b> Node and SDK for the <a href="https://neo.org">NEO</a> blockchain.
 </p>
 
 <p align="center">
@@ -18,67 +18,112 @@
 </p>
 
 # Overview
-> This project is currently in alpha and under active development.
 
-### Long term project goals
-Full port of the original C# [NEO project](https://github.com/neo-project). A complete toolkit for the NEO blockchain.
+> This project is currently in **alpha** and under active development.
 
-- Full server (consensus and RPC) nodes.
+## Project Goals
+
+Full port of the original C# [NEO project](https://github.com/neo-project). 
+A complete toolkit for the NEO blockchain, including:
+
+- Full consensus node
+- Full RPC node
 - RPC client
-- build, compile and deploy smart contracts with the Go vm
+- CLI tool
+- Smart contract compiler
 
-### Current state
-This project is still under heavy development. Still working on internal API's and project layout. This should not take longer than 2 weeks. 
+## Current State
 
-The project will exist out of the following topics/packages:
+This project is still under heavy development. Still working on internal API's and project layout. T
+his should not take longer than 2 weeks. 
 
-1. network (started) 
-2. core (started)
-3. api (JSON-RPC server) (started)
-4. vm (open)
-5. smartcontract (open)
+The project will exist out of the following packages:
 
-# Getting started 
-### Server
+| Package       | State   | Developer                            |
+|---------------|---------|--------------------------------------|
+| api           | started | [@anthdm](https://github.com/anthdm) |
+| core          | started | [@anthdm](https://github.com/anthdm) |
+| network       | started | [@anthdm](https://github.com/anthdm) |
+| smartcontract | started | [@revett](https://github.com/revett) |
+| vm            | started | [@revett](https://github.com/revett) |
 
-Install the neoserver cli `go install ./cmd/neoserver`
+# Getting Started 
 
-Currently, there is a minimal subset of the NEO protocol implemented. To start experimenting make sure you a have a private net running on your machine. If you dont, take a look at [docker-privnet-with-gas](https://hub.docker.com/r/metachris/neo-privnet-with-gas/). 
+## Server
+
+Install dependencies, this requires [Glide](https://github.com/Masterminds/glide#install):
+
+```
+make deps
+```
+
+Build the **neo-go** CLI:
+
+```
+make build
+```
+
+Currently, there is a minimal subset of the NEO protocol implemented. 
+To start experimenting make sure you a have a private net running on your machine. 
+If you dont, take a look at [docker-privnet-with-gas](https://hub.docker.com/r/metachris/neo-privnet-with-gas/). 
 
 Start the server:
 
-`neoserver -seed 127.0.0.1:20333`
+```
+./bin/neo-go -seed 127.0.0.1:20333
+```
 
 You can add multiple seeds if you want:
 
-`neoserver -seed 127.0.0.1:20333,127.0.01:20334`
+```
+./bin/neo-go -seed 127.0.0.1:20333,127.0.01:20334
+```
 
-By default the server will currently run on port 3000, for testing purposes. You can change that by setting the tcp flag:
+By default the server will currently run on port 3000, for testing purposes. 
+You can change that by setting the tcp flag:
 
-`neoserver -seed 127.0.0.1:20333 -tcp 1337`
+```
+./bin/neo-go -seed 127.0.0.1:20333 -tcp 1337
+```
+
+## RPC
 
-### RPC
 If you want your node to also serve JSON-RPC, you can do that by setting the following flag:
 
-`neoserver -rpc 4000`
+```
+./bin/neo-go -rpc 4000
+```
 
-In this case server will accept and respond JSON-RPC on port 4000. Keep in mind that currently there is only a small subset of the JSON-RPC implemented. Feel free to make a PR with more functionality.
+In this case server will accept and respond JSON-RPC on port 4000. 
+Keep in mind that currently there is only a small subset of the JSON-RPC implemented. 
+Feel free to make a PR with more functionality.
 
-### vm
-To be implemented..
+## VM
 
-### smart contracts
-To be implemented..
+```
+TODO
+```
+
+## Smart Contracts
+
+```
+TODO
+```
 
 # Contributing
-Feel free to contribute to this project after reading the [contributing guidelines](https://github.com/anthdm/neo-go/blob/master/CONTRIBUTING.md).
 
-Before starting to work on a certain topic, create an new issue first, describing the feauture/topic you are going to implement.
+Feel free to contribute to this project after reading the 
+[contributing guidelines](https://github.com/anthdm/neo-go/blob/master/CONTRIBUTING.md).
+
+Before starting to work on a certain topic, create an new issue first, 
+describing the feauture/topic you are going to implement.
 
 # Contact
+
 - [@anthdm](https://github.com/anthdm) on Github
 - [@anthdm](https://twitter.com/anthdm) on Twitter
 - Send me an email anthony@cityofzion.io
 
 # License
+
 - Open-source [MIT](https://github.com/anthdm/neo-go/blob/master/LICENCE.md)

VERSION

@@ -0,0 +1 @@
+0.2.0

circle.yml

@@ -0,0 +1,86 @@
+version: 2
+jobs:
+  install_deps:
+    working_directory: /go/src/github.com/CityOfZion/neo-go
+    docker:
+      - image: vidsyhq/go-builder:latest
+    steps:
+      - checkout
+      - restore_cache:
+          key: dependency-cache-{{ .Revision }}
+      - run: BUILD=false /scripts/build.sh
+      - save_cache:
+          key: dependency-cache-{{ .Revision }}
+          paths:
+            - vendor
+  test:
+    working_directory: /go/src/github.com/CityOfZion/neo-go
+    docker:
+      - image: vidsyhq/go-builder:latest
+    steps:
+      - checkout
+      - restore_cache:
+          key: dependency-cache-{{ .Revision }}
+      - run: make test
+  vet:
+    working_directory: /go/src/github.com/CityOfZion/neo-go
+    docker:
+      - image: vidsyhq/go-builder:latest
+    steps:
+      - checkout
+      - restore_cache:
+          key: dependency-cache-{{ .Revision }}
+      - run: make vet
+  check_version:
+    working_directory: /go/src/github.com/CityOfZion/neo-go
+    docker:
+      - image: vidsyhq/go-builder:latest
+    steps:
+      - checkout
+      - run: make check-version
+  build_cli:
+    working_directory: /go/src/github.com/CityOfZion/neo-go
+    docker:
+      - image: vidsyhq/go-builder:latest
+    steps:
+      - checkout
+      - run: make build
+
+workflows:
+  version: 2
+  workflow:
+    jobs:
+      - install_deps:
+          filters:
+            tags:
+              only: /[0-9]+\.[0-9]+\.[0-9]+/
+            branches:
+              ignore: master
+      - test:
+          requires:
+            - install_deps
+          filters:
+            tags:
+              only: /[0-9]+\.[0-9]+\.[0-9]+/
+            branches:
+              ignore: master
+      - vet:
+          requires:
+            - install_deps
+          filters:
+            tags:
+              only: /[0-9]+\.[0-9]+\.[0-9]+/
+            branches:
+              ignore: master
+      - check_version:
+          filters:
+            branches:
+              ignore: master
+      - build_cli:
+          requires:
+            - install_deps
+          filters:
+            tags:
+              only: /[0-9]+\.[0-9]+\.[0-9]+/
+            branches:
+              ignore: master

cli/main.go

@@ -4,7 +4,7 @@ import (
 	"flag"
 	"strings"
 
-	"github.com/anthdm/neo-go/pkg/network"
+	"github.com/CityOfZion/neo-go/pkg/network"
 )
 
 var (

glide.lock

@@ -0,0 +1,4 @@
+hash: b1152abdd9a1fa1e70773cddcf54247d3fe3332602604f9f2233165ced02eeaf
+updated: 2018-02-01T18:34:22.684905Z
+imports: []
+testImports: []

glide.yaml

@@ -0,0 +1,2 @@
+package: github.com/CityOfZion/neo-go
+import: []

pkg/core/block.go

@@ -1,20 +1,24 @@
 package core
 
 import (
+	"bytes"
+	"crypto/sha256"
 	"encoding/binary"
 	"io"
 
-	. "github.com/anthdm/neo-go/pkg/util"
+	. "github.com/CityOfZion/neo-go/pkg/util"
 )
 
-// Block represents one block in the chain.
-type Block struct {
+// BlockBase holds the base info of a block
+type BlockBase struct {
 	Version uint32
 	// hash of the previous block.
 	PrevBlock Uint256
 	// Root hash of a transaction list.
 	MerkleRoot Uint256
-	// timestamp
+	// The time stamp of each block must be later than previous block's time stamp.
+	// Generally the difference of two block's time stamp is about 15 seconds and imprecision is allowed.
+	// The height of the block must be exactly equal to the height of the previous block plus 1.
 	Timestamp uint32
 	// height of the block
 	Height uint32
@@ -22,14 +26,40 @@ type Block struct {
 	Nonce uint64
 	// contract addresss of the next miner
 	NextMiner Uint160
-	// seperator ? fixed to 1
+	// fixed to 1
 	_sep uint8
 	// Script used to validate the block
 	Script *Witness
+}
+
+// BlockHead holds the head info of a block
+type BlockHead struct {
+	BlockBase
+	// fixed to 0
+	_sep1 uint8
+}
+
+// Block represents one block in the chain.
+type Block struct {
+	BlockBase
 	// transaction list
 	Transactions []*Transaction
 }
 
+// encodeHashableFields will only encode the fields used for hashing.
+// see Hash() for more information about the fields.
+func (b *Block) encodeHashableFields(w io.Writer) error {
+	err := binary.Write(w, binary.LittleEndian, &b.Version)
+	err = binary.Write(w, binary.LittleEndian, &b.PrevBlock)
+	err = binary.Write(w, binary.LittleEndian, &b.MerkleRoot)
+	err = binary.Write(w, binary.LittleEndian, &b.Timestamp)
+	err = binary.Write(w, binary.LittleEndian, &b.Height)
+	err = binary.Write(w, binary.LittleEndian, &b.Nonce)
+	err = binary.Write(w, binary.LittleEndian, &b.NextMiner)
+
+	return err
+}
+
 // EncodeBinary encodes the block to the given writer.
 func (b *Block) EncodeBinary(w io.Writer) error {
 	return nil
@@ -66,5 +96,20 @@ func (b *Block) DecodeBinary(r io.Reader) error {
 	return err
 }
 
+// Hash return the hash of the block.
+// When calculating the hash value of the block, instead of calculating the entire block,
+// only first seven fields in the block head will be calculated, which are
+// version, PrevBlock, MerkleRoot, timestamp, and height, the nonce, NextMiner.
+// Since MerkleRoot already contains the hash value of all transactions,
+// the modification of transaction will influence the hash value of the block.
+func (b *Block) Hash() (hash Uint256, err error) {
+	buf := new(bytes.Buffer)
+	if err = b.encodeHashableFields(buf); err != nil {
+		return
+	}
+	hash = sha256.Sum256(buf.Bytes())
+	return
+}
+
 // Size implements the payload interface.
 func (b *Block) Size() uint32 { return 0 }

pkg/core/block_test.go

@@ -0,0 +1,6 @@
+package core
+
+import "testing"
+
+func TestBlockEncodeDecode(t *testing.T) {
+}

pkg/core/blockchain.go

@@ -0,0 +1,26 @@
+package core
+
+// tuning parameters
+const (
+	secondsPerBlock = 15
+)
+
+var (
+	genAmount = []int{8, 7, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}
+)
+
+// Blockchain holds the chain.
+type Blockchain struct {
+	// Any object that satisfies the BlockchainStorer interface.
+	BlockchainStorer
+
+	// index of the latest block.
+	currentHeight uint32
+}
+
+// NewBlockchain returns a pointer to a Blockchain.
+func NewBlockchain(store BlockchainStorer) *Blockchain {
+	return &Blockchain{
+		BlockchainStorer: store,
+	}
+}

pkg/core/blockchain_storer.go

@@ -0,0 +1,44 @@
+package core
+
+import (
+	"sync"
+
+	"github.com/CityOfZion/neo-go/pkg/util"
+)
+
+// BlockchainStorer is anything that can persist and retrieve the blockchain.
+type BlockchainStorer interface {
+	HasBlock(util.Uint256) bool
+	GetBlockByHeight(uint32) (*Block, error)
+	GetBlockByHash(util.Uint256) (*Block, error)
+}
+
+// MemoryStore is an in memory implementation of a BlockChainStorer.
+type MemoryStore struct {
+	mtx    *sync.RWMutex
+	blocks map[util.Uint256]*Block
+}
+
+// NewMemoryStore returns a pointer to a MemoryStore object.
+func NewMemoryStore() *MemoryStore {
+	return &MemoryStore{
+		mtx:    &sync.RWMutex{},
+		blocks: map[util.Uint256]*Block{},
+	}
+}
+
+// HasBlock implements the BlockchainStorer interface.
+func (s *MemoryStore) HasBlock(hash util.Uint256) bool {
+	_, ok := s.blocks[hash]
+	return ok
+}
+
+// GetBlockByHash returns a block by its hash.
+func (s *MemoryStore) GetBlockByHash(hash util.Uint256) (*Block, error) {
+	return nil, nil
+}
+
+// GetBlockByHeight returns a block by its height.
+func (s *MemoryStore) GetBlockByHeight(i uint32) (*Block, error) {
+	return nil, nil
+}

pkg/core/transaction.go

@@ -5,31 +5,9 @@ import (
 	"io"
 )
 
-// TransactionType is the type of a transaction.
-type TransactionType uint8
-
-// String implements the stringer interface.
-func (t TransactionType) String() string {
-	switch t {
-	case MinerTX:
-		return "miner transaction"
-	case IssueTX:
-		return "issue transaction"
-	case ClaimTX:
-		return "claim transaction"
-	case EnrollmentTX:
-		return "enrollment transaction"
-	case VotingTX:
-		return "voting transaction"
-	case RegisterTX:
-		return "register transaction"
-	case ContractTX:
-		return "contract transaction"
-	case AgencyTX:
-		return "agency transaction"
-	default:
-		return ""
-	}
+// Transaction is a process recorded in the NEO system.
+type Transaction struct {
+	Type TransactionType
 }
 
 // All processes in NEO system are recorded in transactions.
@@ -45,18 +23,13 @@ const (
 	AgencyTX                     = 0xb0
 )
 
-// Transaction is a process recorded in the NEO system.
-type Transaction struct {
-	Type TransactionType
-}
-
 // DecodeBinary implements the payload interface.
-func (t *Transaction) DecodeBinary(r io.Reader) error {
+func (t Transaction) DecodeBinary(r io.Reader) error {
 	err := binary.Read(r, binary.LittleEndian, &t.Type)
 	return err
 }
 
 // EncodeBinary implements the payload interface.
-func (t *Transaction) EncodeBinary(w io.Writer) error {
+func (t Transaction) EncodeBinary(w io.Writer) error {
 	return nil
 }

pkg/core/transaction_type.go

@@ -0,0 +1,28 @@
+package core
+
+// TransactionType is the type of a transaction.
+type TransactionType uint8
+
+// String implements the stringer interface.
+func (t TransactionType) String() string {
+	switch t {
+	case MinerTX:
+		return "miner transaction"
+	case IssueTX:
+		return "issue transaction"
+	case ClaimTX:
+		return "claim transaction"
+	case EnrollmentTX:
+		return "enrollment transaction"
+	case VotingTX:
+		return "voting transaction"
+	case RegisterTX:
+		return "register transaction"
+	case ContractTX:
+		return "contract transaction"
+	case AgencyTX:
+		return "agency transaction"
+	default:
+		return ""
+	}
+}

pkg/network/message.go

@@ -8,8 +8,8 @@ import (
 	"fmt"
 	"io"
 
-	"github.com/anthdm/neo-go/pkg/core"
-	"github.com/anthdm/neo-go/pkg/network/payload"
+	"github.com/CityOfZion/neo-go/pkg/core"
+	"github.com/CityOfZion/neo-go/pkg/network/payload"
 )
 
 const (

pkg/network/message_test.go

@@ -5,7 +5,7 @@ import (
 	"reflect"
 	"testing"
 
-	"github.com/anthdm/neo-go/pkg/network/payload"
+	"github.com/CityOfZion/neo-go/pkg/network/payload"
 )
 
 func TestMessageEncodeDecode(t *testing.T) {

pkg/network/payload/addr.go

@@ -4,7 +4,7 @@ import (
 	"encoding/binary"
 	"io"
 
-	"github.com/anthdm/neo-go/pkg/util"
+	"github.com/CityOfZion/neo-go/pkg/util"
 )
 
 // AddrWithTime payload

pkg/network/payload/addr_test.go

@@ -6,7 +6,7 @@ import (
 	"reflect"
 	"testing"
 
-	"github.com/anthdm/neo-go/pkg/util"
+	"github.com/CityOfZion/neo-go/pkg/util"
 )
 
 func TestEncodeDecodeAddr(t *testing.T) {

pkg/network/payload/getblocks.go

@@ -0,0 +1,54 @@
+package payload
+
+import (
+	"encoding/binary"
+	"io"
+
+	. "github.com/CityOfZion/neo-go/pkg/util"
+)
+
+// HashStartStop contains fields and methods to be shared with the
+// "GetBlocks" and "GetHeaders" payload.
+type HashStartStop struct {
+	// hash of latest block that node requests
+	HashStart []Uint256
+	// hash of last block that node requests
+	HashStop Uint256
+}
+
+// DecodeBinary implements the payload interface.
+func (p *HashStartStop) DecodeBinary(r io.Reader) error {
+	var lenStart uint8
+
+	err := binary.Read(r, binary.LittleEndian, &lenStart)
+	p.HashStart = make([]Uint256, lenStart)
+	err = binary.Read(r, binary.LittleEndian, &p.HashStart)
+	err = binary.Read(r, binary.LittleEndian, &p.HashStop)
+
+	return err
+}
+
+// EncodeBinary implements the payload interface.
+func (p *HashStartStop) EncodeBinary(w io.Writer) error {
+	err := binary.Write(w, binary.LittleEndian, uint8(len(p.HashStart)))
+	err = binary.Write(w, binary.LittleEndian, p.HashStart)
+	err = binary.Write(w, binary.LittleEndian, p.HashStop)
+
+	return err
+}
+
+// Size implements the payload interface.
+func (p *HashStartStop) Size() uint32 { return 0 }
+
+// GetBlocks payload
+type GetBlocks struct {
+	HashStartStop
+}
+
+// NewGetBlocks return a pointer to a GetBlocks object.
+func NewGetBlocks(start []Uint256, stop Uint256) *GetBlocks {
+	p := &GetBlocks{}
+	p.HashStart = start
+	p.HashStop = stop
+	return p
+}

pkg/network/payload/getblocks_test.go

@@ -0,0 +1,37 @@
+package payload
+
+import (
+	"bytes"
+	"crypto/sha256"
+	"reflect"
+	"testing"
+
+	. "github.com/CityOfZion/neo-go/pkg/util"
+)
+
+func TestGetBlocksEncodeDecode(t *testing.T) {
+	start := []Uint256{
+		sha256.Sum256([]byte("a")),
+		sha256.Sum256([]byte("b")),
+	}
+	stop := sha256.Sum256([]byte("c"))
+
+	p := NewGetBlocks(start, stop)
+	buf := new(bytes.Buffer)
+	if err := p.EncodeBinary(buf); err != nil {
+		t.Fatal(err)
+	}
+
+	if have, want := buf.Len(), 1+64+32; have != want {
+		t.Fatalf("expecting a length of %d got %d", want, have)
+	}
+
+	pDecode := &GetBlocks{}
+	if err := pDecode.DecodeBinary(buf); err != nil {
+		t.Fatal(err)
+	}
+
+	if !reflect.DeepEqual(p, pDecode) {
+		t.Fatalf("expecting both getblocks payloads to be equal %v and %v", p, pDecode)
+	}
+}

pkg/network/payload/getheaders.go

@@ -0,0 +1,17 @@
+package payload
+
+import "github.com/CityOfZion/neo-go/pkg/util"
+
+// GetHeaders payload is the same as the "GetBlocks" payload.
+type GetHeaders struct {
+	HashStartStop
+}
+
+// NewGetHeaders return a pointer to a GetHeaders object.
+func NewGetHeaders(start []util.Uint256, stop util.Uint256) *GetHeaders {
+	p := &GetHeaders{}
+	p.HashStart = start
+	p.HashStop = stop
+
+	return p
+}

pkg/network/payload/getheaders_test.go

@@ -0,0 +1,37 @@
+package payload
+
+import (
+	"bytes"
+	"crypto/sha256"
+	"reflect"
+	"testing"
+
+	"github.com/CityOfZion/neo-go/pkg/util"
+)
+
+func TestGetHeadersEncodeDecode(t *testing.T) {
+	start := []util.Uint256{
+		sha256.Sum256([]byte("a")),
+		sha256.Sum256([]byte("b")),
+	}
+	stop := sha256.Sum256([]byte("c"))
+
+	p := NewGetHeaders(start, stop)
+	buf := new(bytes.Buffer)
+	if err := p.EncodeBinary(buf); err != nil {
+		t.Fatal(err)
+	}
+
+	if have, want := buf.Len(), 1+64+32; have != want {
+		t.Fatalf("expecting a length of %d got %d", want, have)
+	}
+
+	pDecode := &GetHeaders{}
+	if err := pDecode.DecodeBinary(buf); err != nil {
+		t.Fatal(err)
+	}
+
+	if !reflect.DeepEqual(p, pDecode) {
+		t.Fatalf("expecting both getheaders payloads to be equal %v and %v", p, pDecode)
+	}
+}

pkg/network/payload/inventory.go

@@ -4,7 +4,7 @@ import (
 	"encoding/binary"
 	"io"
 
-	. "github.com/anthdm/neo-go/pkg/util"
+	. "github.com/CityOfZion/neo-go/pkg/util"
 )
 
 // The node can broadcast the object information it owns by this message.

pkg/network/payload/inventory_test.go

@@ -6,7 +6,7 @@ import (
 	"reflect"
 	"testing"
 
-	. "github.com/anthdm/neo-go/pkg/util"
+	. "github.com/CityOfZion/neo-go/pkg/util"
 )
 
 func TestInventoryEncodeDecode(t *testing.T) {

pkg/network/peer.go

@@ -1,7 +1,7 @@
 package network
 
 import (
-	"github.com/anthdm/neo-go/pkg/util"
+	"github.com/CityOfZion/neo-go/pkg/util"
 )
 
 // Peer is the local representation of a remote node. It's an interface that may
@@ -9,7 +9,6 @@ import (
 type Peer interface {
 	id() uint32
 	addr() util.Endpoint
-	verack() bool
 	disconnect()
 	callVersion(*Message)
 	callGetaddr(*Message)
@@ -20,7 +19,6 @@ type Peer interface {
 type LocalPeer struct {
 	s        *Server
 	nonce    uint32
-	isVerack bool
 	endpoint util.Endpoint
 }
 
@@ -39,6 +37,5 @@ func (p *LocalPeer) callGetaddr(msg *Message) {
 }
 
 func (p *LocalPeer) id() uint32          { return p.nonce }
-func (p *LocalPeer) verack() bool        { return p.isVerack }
 func (p *LocalPeer) addr() util.Endpoint { return p.endpoint }
 func (p *LocalPeer) disconnect()         {}

pkg/network/server.go

@@ -5,10 +5,12 @@ import (
 	"log"
 	"net"
 	"os"
+	"sync"
 	"time"
 
-	"github.com/anthdm/neo-go/pkg/network/payload"
-	"github.com/anthdm/neo-go/pkg/util"
+	"github.com/CityOfZion/neo-go/pkg/core"
+	"github.com/CityOfZion/neo-go/pkg/network/payload"
+	"github.com/CityOfZion/neo-go/pkg/util"
 )
 
 const (
@@ -54,6 +56,46 @@ type Server struct {
 	listener net.Listener
 	// channel for safely responding the number of current connected peers.
 	peerCountCh chan peerCount
+	// a list of hashes that
+	knownHashes protectedHashmap
+	// The blockchain.
+	bc *core.Blockchain
+}
+
+type protectedHashmap struct {
+	*sync.RWMutex
+	hashes map[util.Uint256]bool
+}
+
+func (m protectedHashmap) add(h util.Uint256) bool {
+	m.Lock()
+	defer m.Unlock()
+
+	if _, ok := m.hashes[h]; !ok {
+		m.hashes[h] = true
+		return true
+	}
+	return false
+}
+
+func (m protectedHashmap) remove(h util.Uint256) bool {
+	m.Lock()
+	defer m.Unlock()
+
+	if _, ok := m.hashes[h]; ok {
+		delete(m.hashes, h)
+		return true
+	}
+	return false
+}
+
+func (m protectedHashmap) has(h util.Uint256) bool {
+	m.RLock()
+	defer m.RUnlock()
+
+	_, ok := m.hashes[h]
+
+	return ok
 }
 
 // NewServer returns a pointer to a new server.
@@ -76,6 +118,8 @@ func NewServer(net NetMode) *Server {
 		net:         net,
 		quit:        make(chan struct{}),
 		peerCountCh: make(chan peerCount),
+		// knownHashes: protectedHashmap{},
+		bc: core.NewBlockchain(core.NewMemoryStore()),
 	}
 
 	return s
@@ -162,11 +206,11 @@ func (s *Server) handlePeerConnected(p Peer) {
 func (s *Server) handleVersionCmd(msg *Message, p Peer) *Message {
 	version := msg.Payload.(*payload.Version)
 	if s.id == version.Nonce {
-		p.disconnect()
+		// s.unregister <- p
 		return nil
 	}
 	if p.addr().Port != version.Port {
-		p.disconnect()
+		// s.unregister <- p
 		return nil
 	}
 	return newMessage(ModeDevNet, cmdVerack, nil)
@@ -176,22 +220,46 @@ func (s *Server) handleGetaddrCmd(msg *Message, p Peer) *Message {
 	return nil
 }
 
+// The node can broadcast the object information it owns by this message.
+// The message can be sent automatically or can be used to answer getbloks messages.
 func (s *Server) handleInvCmd(msg *Message, p Peer) *Message {
 	inv := msg.Payload.(*payload.Inventory)
 	if !inv.Type.Valid() {
-		p.disconnect()
+		s.unregister <- p
 		return nil
 	}
 	if len(inv.Hashes) == 0 {
-		p.disconnect()
+		s.unregister <- p
 		return nil
 	}
 
+	// todo: only grab the hashes that we dont know.
+
 	payload := payload.NewInventory(inv.Type, inv.Hashes)
 	resp := newMessage(s.net, cmdGetData, payload)
 	return resp
 }
 
+// handleBlockCmd processes the received block.
+func (s *Server) handleBlockCmd(msg *Message, p Peer) {
+	block := msg.Payload.(*core.Block)
+	hash, err := block.Hash()
+	if err != nil {
+		// not quite sure what to do here.
+		// should we disconnect the client or just silently log and move on?
+		s.logger.Printf("failed to generate block hash: %s", err)
+		return
+	}
+
+	fmt.Println(hash)
+
+	if s.bc.HasBlock(hash) {
+		return
+	}
+}
+
+// After receiving the getaddr message, the node returns an addr message as response
+// and provides information about the known nodes on the network.
 func (s *Server) handleAddrCmd(msg *Message, p Peer) {
 	addrList := msg.Payload.(*payload.AddressList)
 	for _, addr := range addrList.Addrs {
@@ -202,6 +270,9 @@ func (s *Server) handleAddrCmd(msg *Message, p Peer) {
 	}
 }
 
+func (s *Server) relayInventory(inv *payload.Inventory) {
+}
+
 // check if the addr is already connected to the server.
 func (s *Server) peerAlreadyConnected(addr net.Addr) bool {
 	for peer := range s.peers {

pkg/network/server_test.go

@@ -3,7 +3,7 @@ package network
 import (
 	"testing"
 
-	"github.com/anthdm/neo-go/pkg/network/payload"
+	"github.com/CityOfZion/neo-go/pkg/network/payload"
 )
 
 func TestHandleVersion(t *testing.T) {

pkg/network/tcp.go

@@ -3,10 +3,11 @@ package network
 import (
 	"bytes"
 	"fmt"
+	"io"
 	"net"
 
-	"github.com/anthdm/neo-go/pkg/network/payload"
-	"github.com/anthdm/neo-go/pkg/util"
+	"github.com/CityOfZion/neo-go/pkg/network/payload"
+	"github.com/CityOfZion/neo-go/pkg/util"
 )
 
 func listenTCP(s *Server, port int) error {
@@ -22,6 +23,7 @@ func listenTCP(s *Server, port int) error {
 		if err != nil {
 			return err
 		}
+
 		go handleConnection(s, conn)
 	}
 }
@@ -54,13 +56,18 @@ func handleConnection(s *Server, conn net.Conn) {
 		s.unregister <- peer
 	}()
 
-	// Start a goroutine that will handle all writes to the registered peer.
+	// Start a goroutine that will handle all outgoing messages.
 	go peer.writeLoop()
+	// Start a goroutine that will handle all incomming messages.
+	go handleMessage(s, peer)
 
 	// Read from the connection and decode it into a Message ready for processing.
 	buf := make([]byte, 1024)
 	for {
 		_, err := conn.Read(buf)
+		if err == io.EOF {
+			break
+		}
 		if err != nil {
 			s.logger.Printf("conn read error: %s", err)
 			break
@@ -71,12 +78,20 @@ func handleConnection(s *Server, conn net.Conn) {
 			s.logger.Printf("decode error %s", err)
 			break
 		}
-		handleMessage(msg, s, peer)
+
+		peer.receive <- msg
 	}
 }
 
 // handleMessage hands the message received from a TCP connection over to the server.
-func handleMessage(msg *Message, s *Server, p *TCPPeer) {
+func handleMessage(s *Server, p *TCPPeer) {
+	// Disconnect the peer when we break out of the loop.
+	defer func() {
+		s.unregister <- p
+	}()
+
+	for {
+		msg := <-p.receive
 		command := msg.commandType()
 
 		s.logger.Printf("IN :: %d :: %s :: %v", p.id(), command, msg)
@@ -84,7 +99,6 @@ func handleMessage(msg *Message, s *Server, p *TCPPeer) {
 		switch command {
 		case cmdVersion:
 			resp := s.handleVersionCmd(msg, p)
-		p.isVerack = true
 			p.nonce = msg.Payload.(*payload.Version).Nonce
 			p.send <- resp
 		case cmdAddr:
@@ -95,6 +109,7 @@ func handleMessage(msg *Message, s *Server, p *TCPPeer) {
 			resp := s.handleInvCmd(msg, p)
 			p.send <- resp
 		case cmdBlock:
+			s.handleBlockCmd(msg, p)
 		case cmdConsensus:
 		case cmdTX:
 		case cmdVerack:
@@ -103,7 +118,7 @@ func handleMessage(msg *Message, s *Server, p *TCPPeer) {
 		case cmdGetBlocks:
 		case cmdGetData:
 		case cmdHeaders:
-	default:
+		}
 	}
 }
 
@@ -118,8 +133,8 @@ type TCPPeer struct {
 	endpoint util.Endpoint
 	// channel to coordinate messages writen back to the connection.
 	send chan *Message
-	// whether this peers version was acknowledged.
-	isVerack bool
+	// channel to receive from underlying connection.
+	receive chan *Message
 }
 
 // NewTCPPeer returns a pointer to a TCP Peer.
@@ -129,6 +144,7 @@ func NewTCPPeer(conn net.Conn, s *Server) *TCPPeer {
 	return &TCPPeer{
 		conn:     conn,
 		send:     make(chan *Message),
+		receive:  make(chan *Message),
 		endpoint: e,
 		s:        s,
 	}
@@ -148,20 +164,17 @@ func (p *TCPPeer) addr() util.Endpoint {
 	return p.endpoint
 }
 
-// verack implements the peer interface
-func (p *TCPPeer) verack() bool {
-	return p.isVerack
-}
-
 // callGetaddr will send the "getaddr" command to the remote.
 func (p *TCPPeer) callGetaddr(msg *Message) {
 	p.send <- msg
 }
 
 // disconnect closes the send channel and the underlying connection.
+// TODO: this needs some love. We will get send on closed channel.
 func (p *TCPPeer) disconnect() {
-	close(p.send)
 	p.conn.Close()
+	close(p.send)
+	close(p.receive)
 }
 
 // writeLoop writes messages to the underlying TCP connection.