add privk parser, add node start read config multiple nodes

.gitignore

@@ -0,0 +1 @@
+tmp

README.md

@@ -1,4 +1,4 @@
-# slowlorisdb
+# slowlorisdb [![Go Report Card](https://goreportcard.com/badge/github.com/arnaucube/slowlorisdb)](https://goreportcard.com/report/github.com/arnaucube/slowlorisdb) [![GoDoc](https://godoc.org/github.com/arnaucube/slowlorisdb?status.svg)](https://godoc.org/github.com/arnaucube/slowlorisdb)
 
 Slow, decentralized and cryptographically consistent database
 
@@ -7,3 +7,25 @@ Basically this repo is a blockchain written from scratch, that allows to launch
 Watch the blockchain in action: http://www.youtubemultiplier.com/5ca9c1a540b31-slowlorisdb-visual-representation.php
 
 ![slowloris](https://04019a5a-a-62cb3a1a-s-sites.googlegroups.com/site/jchristensensdigitalportfolio/slow-loris/IO-moth-eating-frozen-apple-sauce.jpg "slowloris")
+
+
+## Run
+The repo is under construction
+
+- create node
+```sh
+# node0
+go run main.go --config config0.yaml create
+
+# node1
+go run main.go --config config1.yaml create
+```
+
+- run node
+```sh
+# node0
+go run main.go --config config0.yaml start
+
+# node1
+go run main.go --config config1.yaml start
+```

cmd/cmd.go

@@ -2,9 +2,12 @@ package cmd
 
 import (
 	"crypto/ecdsa"
+	"crypto/x509"
 	"encoding/hex"
+	"encoding/pem"
 	"fmt"
 	"io/ioutil"
+	"os"
 
 	"github.com/arnaucube/slowlorisdb/config"
 	"github.com/arnaucube/slowlorisdb/core"
@@ -29,14 +32,52 @@ var Commands = []cli.Command{
 	},
 }
 
+func writePrivKToFile(privK *ecdsa.PrivateKey, path string) error {
+	x509Encoded, err := x509.MarshalECPrivateKey(privK)
+	if err != nil {
+		return err
+	}
+	pemEncoded := pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: x509Encoded})
+	// write privK to file
+	err = ioutil.WriteFile(path, pemEncoded, 0777)
+	return err
+}
+
+func readPrivKFromFile(path string) (*ecdsa.PrivateKey, error) {
+	pemEncoded, err := ioutil.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+	block, _ := pem.Decode([]byte(pemEncoded))
+	x509Encoded := block.Bytes
+	privK, err := x509.ParseECPrivateKey(x509Encoded)
+	return privK, err
+}
+
 // creates the node, this needs to be executed for first time
 func cmdCreate(c *cli.Context) error {
+	conf, err := config.MustRead(c)
+	if err != nil {
+		return err
+	}
+
 	log.Info("creating new keys of the node")
 	privK, err := core.NewKey()
 	if err != nil {
 		return err
 	}
-	fmt.Println(privK)
+	err = os.MkdirAll(conf.StoragePath, 0777)
+	if err != nil {
+		return err
+	}
+	err = writePrivKToFile(privK, conf.StoragePath+"/privK.pem")
+	if err != nil {
+		return err
+	}
+
+	fmt.Println("pubK", hex.EncodeToString(core.PackPubK(&privK.PublicKey)))
+	fmt.Println("addr", core.AddressFromPubK(&privK.PublicKey).String())
+
 	return nil
 }
 
@@ -46,11 +87,7 @@ func cmdStart(c *cli.Context) error {
 		return err
 	}
 
-	dir, err := ioutil.TempDir("", conf.DbPath)
-	if err != nil {
-		return err
-	}
-	db, err := db.New(dir)
+	db, err := db.New(conf.StoragePath + "/db")
 	if err != nil {
 		return err
 	}
@@ -68,8 +105,14 @@ func cmdStart(c *cli.Context) error {
 
 	bc := core.NewPoABlockchain(db, authNodes)
 
-	// TODO parse privK from path in the config file
-	privK, err := core.NewKey()
+	// parse privK from path in the config file
+	privK, err := readPrivKFromFile(conf.StoragePath + "/privK.pem")
+	if err != nil {
+		return err
+	}
+	fmt.Println("pubK", hex.EncodeToString(core.PackPubK(&privK.PublicKey)))
+	fmt.Println("addr", core.AddressFromPubK(&privK.PublicKey).String())
+
 	node, err := node.NewNode(privK, bc, true)
 	if err != nil {
 		return err

config/config.go

@@ -8,10 +8,10 @@ import (
 )
 
 type Config struct {
-	DbPath    string
-	Port      string
-	Dest      string
-	AuthNodes []string // PubKs in hex format of the AuthNodes for the blockchain
+	StoragePath string
+	Port        string
+	Dest        string
+	AuthNodes   []string // PubKs in hex format of the AuthNodes for the blockchain
 }
 
 func MustRead(c *cli.Context) (*Config, error) {

config0.yaml

@@ -0,0 +1,6 @@
+storagepath: "tmp/node0"
+port: 3000
+dest: 3001
+authnodes:
+        "16be582c80c9b9be29b60f2bcd032654c21256b6bf74535743842bef33432132"
+        "96758cfdc821abad27c6301439af9f6d0873e237affc60fbc4cc5b33b41b8726"

config1.yaml

@@ -0,0 +1,6 @@
+storagepath: "tmp/node1"
+port: 4000
+dest: 4001
+authnodes:
+        "16be582c80c9b9be29b60f2bcd032654c21256b6bf74535743842bef33432132"
+        "96758cfdc821abad27c6301439af9f6d0873e237affc60fbc4cc5b33b41b8726"

core/keys.go

@@ -19,7 +19,7 @@ func (addr Address) String() string {
 func NewKey() (*ecdsa.PrivateKey, error) {
 	curve := elliptic.P256()
 
-	privatekey := new(ecdsa.PrivateKey)
+	// privatekey := new(ecdsa.PrivateKey)
 	privatekey, err := ecdsa.GenerateKey(curve, rand.Reader)
 	if err != nil {
 		return nil, err
@@ -45,6 +45,11 @@ func AddressFromPrivK(privK *ecdsa.PrivateKey) Address {
 	return Address(h)
 }
 
+func AddressFromPubK(pubK *ecdsa.PublicKey) Address {
+	h := HashBytes(PackPubK(pubK))
+	return Address(h)
+}
+
 func (sig *Signature) Bytes() []byte {
 	b := sig.R.Bytes()
 	b = append(b, sig.S.Bytes()...)
@@ -74,8 +79,8 @@ type Signature struct {
 }
 
 func Sign(privK *ecdsa.PrivateKey, m []byte) (*Signature, error) {
-	r := big.NewInt(0)
-	s := big.NewInt(0)
+	// r := big.NewInt(0)
+	// s := big.NewInt(0)
 
 	hashMsg := HashBytes(m)