Browse Source

Expose ledger data to api endpoint

Ettore Di Giacinto 3 years ago
parent
commit
17f507e753
5 changed files with 106 additions and 14 deletions
  1. 51 0
      cmd/api.go
  2. 2 1
      go.mod
  3. 27 0
      go.sum
  4. 1 0
      main.go
  5. 25 13
      pkg/blockchain/ledger.go

+ 51 - 0
cmd/api.go

@@ -0,0 +1,51 @@
+package cmd
+
+import (
+	"net/http"
+
+	"github.com/labstack/echo/v4"
+	"github.com/mudler/edgevpn/pkg/blockchain"
+	"github.com/mudler/edgevpn/pkg/edgevpn"
+	"github.com/urfave/cli"
+	"go.uber.org/zap"
+)
+
+func API(l *zap.Logger) cli.Command {
+	return cli.Command{
+		Name:        "api",
+		Description: "api starts an http server to display network informations",
+		Flags: append(CommonFlags,
+			&cli.StringFlag{
+				Name:  "listen",
+				Value: ":8080",
+			},
+		),
+		Action: func(c *cli.Context) error {
+			e := edgevpn.New(cliToOpts(l, c)...)
+
+			mw, err := e.MessageWriter()
+			if err != nil {
+				return err
+			}
+
+			ledger := blockchain.New(mw, 1000)
+
+			// Join the node to the network, using our ledger
+			if err := e.Join(ledger); err != nil {
+				return err
+			}
+
+			ec := echo.New()
+
+			ec.GET("/api/data", func(c echo.Context) error {
+				return c.JSON(http.StatusOK, ledger.CurrentData())
+			})
+
+			ec.GET("/api/blockchain", func(c echo.Context) error {
+				return c.JSON(http.StatusOK, ledger.BlockChain())
+			})
+
+			return ec.Start(c.String("listen"))
+		},
+	}
+}

+ 2 - 1
go.mod

@@ -7,6 +7,7 @@ require (
 	github.com/ipfs/go-log v1.0.5 // indirect
 	github.com/ipfs/go-log/v2 v2.3.0
 	github.com/kr/text v0.2.0 // indirect
+	github.com/labstack/echo/v4 v4.6.1 // indirect
 	github.com/libp2p/go-libp2p v0.15.1
 	github.com/libp2p/go-libp2p-core v0.9.0
 	github.com/libp2p/go-libp2p-discovery v0.5.1
@@ -23,7 +24,7 @@ require (
 	github.com/xlzd/gotp v0.0.0-20181030022105-c8557ba2c119
 	go.opencensus.io v0.23.0 // indirect
 	go.uber.org/zap v1.19.0
-	golang.org/x/net v0.0.0-20210813160813-60bc85c4be6d
+	golang.org/x/net v0.0.0-20210913180222-943fd674d43e
 	gopkg.in/yaml.v2 v2.4.0
 )
 

+ 27 - 0
go.sum

@@ -198,6 +198,7 @@ github.com/gogo/protobuf v1.3.0/go.mod h1:SlYgWuQ5SjCEi6WLHjHCa1yvBfUnHcTbrrZtXP
 github.com/gogo/protobuf v1.3.1/go.mod h1:SlYgWuQ5SjCEi6WLHjHCa1yvBfUnHcTbrrZtXPKa29o=
 github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q=
 github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q=
+github.com/golang-jwt/jwt v3.2.2+incompatible/go.mod h1:8pz2t5EyA70fFQQSrl6XZXzqecmYZeUEB8OUGHkxJ+I=
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
 github.com/golang/groupcache v0.0.0-20160516000752-02826c3e7903/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
 github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
@@ -434,6 +435,10 @@ github.com/kr/pty v1.1.3/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+github.com/labstack/echo/v4 v4.6.1 h1:OMVsrnNFzYlGSdaiYGHbgWQnr+JM7NG+B9suCPie14M=
+github.com/labstack/echo/v4 v4.6.1/go.mod h1:RnjgMWNDB9g/HucVWhQYNQP9PvbYf6adqftqryo7s9k=
+github.com/labstack/gommon v0.3.0 h1:JEeO0bvc78PKdyHxloTKiF8BD5iGrH8T6MSeGvSgob0=
+github.com/labstack/gommon v0.3.0/go.mod h1:MULnywXg0yavhxWKc+lOruYdAhDwPK9wf0OL7NoOu+k=
 github.com/libp2p/go-addr-util v0.0.1/go.mod h1:4ac6O7n9rIAKB1dnd+s8IbbMXkt+oBpzX4/+RACcnlQ=
 github.com/libp2p/go-addr-util v0.0.2/go.mod h1:Ecd6Fb3yIuLzq4bD7VcywcVSBtefcAwnUISBM3WG15E=
 github.com/libp2p/go-addr-util v0.1.0 h1:acKsntI33w2bTU7tC9a0SaPimJGfSI0bFKC18ChxeVI=
@@ -692,11 +697,19 @@ github.com/marten-seemann/tcp v0.0.0-20210406111302-dfbc87cc63fd h1:br0buuQ854V8
 github.com/marten-seemann/tcp v0.0.0-20210406111302-dfbc87cc63fd/go.mod h1:QuCEs1Nt24+FYQEqAAncTDPJIuGs+LxK1MCiFL25pMU=
 github.com/mattn/go-colorable v0.0.9/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaOChaDxuIBZU=
 github.com/mattn/go-colorable v0.1.1/go.mod h1:FuOcm+DKB9mbwrcAfNl7/TZVBZ6rcnceauSikq3lYCQ=
+github.com/mattn/go-colorable v0.1.2/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE=
+github.com/mattn/go-colorable v0.1.8 h1:c1ghPdyEDarC70ftn0y+A/Ee++9zz8ljHG1b13eJ0s8=
+github.com/mattn/go-colorable v0.1.8/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
 github.com/mattn/go-isatty v0.0.3/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNxMWT7Zi4=
 github.com/mattn/go-isatty v0.0.4/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNxMWT7Zi4=
 github.com/mattn/go-isatty v0.0.5/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
+github.com/mattn/go-isatty v0.0.8/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
+github.com/mattn/go-isatty v0.0.9/go.mod h1:YNRxwqDuOph6SZLI9vUUz6OYw3QyUt7WiY2yME+cCiQ=
+github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
 github.com/mattn/go-isatty v0.0.13 h1:qdl+GuBjcsKKDco5BsxPJlId98mSWNKqYA+Co0SC1yA=
 github.com/mattn/go-isatty v0.0.13/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
+github.com/mattn/go-isatty v0.0.14 h1:yVuAays6BHfxijgZPzw+3Zlu5yQgKGP2/hcQbHb7S9Y=
+github.com/mattn/go-isatty v0.0.14/go.mod h1:7GGIvUiUoEMVVmxf/4nioHXj79iQHKdU27kJ6hsGG94=
 github.com/mattn/go-runewidth v0.0.2/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
 github.com/matttproud/golang_protobuf_extensions v1.0.1 h1:4hp9jkHxhMHkqkrB3Ix0jegS5sx/RkqARlsWZ6pIwiU=
 github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
@@ -986,6 +999,11 @@ github.com/urfave/cli v1.20.0/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijb
 github.com/urfave/cli v1.22.1/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
 github.com/urfave/cli v1.22.5 h1:lNq9sAHXK2qfdI8W+GRItjCEkI+2oR4d+MEHy1CKXoU=
 github.com/urfave/cli v1.22.5/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
+github.com/valyala/bytebufferpool v1.0.0 h1:GqA5TC/0021Y/b9FG4Oi9Mr3q7XYx6KllzawFIhcdPw=
+github.com/valyala/bytebufferpool v1.0.0/go.mod h1:6bBcMArwyJ5K/AmCkWv1jt77kVWyCJ6HpOuEn7z0Csc=
+github.com/valyala/fasttemplate v1.0.1/go.mod h1:UQGH1tvbgY+Nz5t2n7tXsz52dQxojPUpymEIMZ47gx8=
+github.com/valyala/fasttemplate v1.2.1 h1:TVEnxayobAdVkhQfrfes2IzOB6o+z4roRkPF52WA1u4=
+github.com/valyala/fasttemplate v1.2.1/go.mod h1:KHLXt3tVN2HBp8eijSv/kGJopbvo7S+qRAEEKiv+SiQ=
 github.com/viant/assertly v0.4.8/go.mod h1:aGifi++jvCrUaklKEKT0BU95igDNaqkvz+49uaYMPRU=
 github.com/viant/toolbox v0.24.0/go.mod h1:OxMCG57V0PXuIP2HNQrtJf2CjqdmbrOx5EkMILuUhzM=
 github.com/vishvananda/netlink v1.1.0 h1:1iyaYNBLmP6L0220aDnYQpo1QEV4t4hJ+xEEhhJH8j0=
@@ -1083,6 +1101,8 @@ golang.org/x/crypto v0.0.0-20210322153248-0c34fe9e7dc2/go.mod h1:T9bdIzuCu7OtxOm
 golang.org/x/crypto v0.0.0-20210506145944-38f3c27a63bf/go.mod h1:P+XmwS30IXTQdn5tA2iutPOUgjI07+tq3H3K9MVA1s8=
 golang.org/x/crypto v0.0.0-20210813211128-0a44fdfbc16e h1:VvfwVmMH40bpMeizC9/K7ipM5Qjucuu16RWfneFPyhQ=
 golang.org/x/crypto v0.0.0-20210813211128-0a44fdfbc16e/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/crypto v0.0.0-20210817164053-32db794688a5 h1:HWj/xjIHfjYU5nVXpTM0s39J9CbLn7Cc5a7IC5rwsMQ=
+golang.org/x/crypto v0.0.0-20210817164053-32db794688a5/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190510132918-efd6b22b2522/go.mod h1:ZjyILWgesfNpC6sMxTJOJm9Kp84zZh5NQWvqDGG3Qr8=
@@ -1171,6 +1191,8 @@ golang.org/x/net v0.0.0-20210428140749-89ef3d95e781/go.mod h1:OJAsFXCWl8Ukc7SiCT
 golang.org/x/net v0.0.0-20210525063256-abc453219eb5/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/net v0.0.0-20210813160813-60bc85c4be6d h1:LO7XpTYMwTqxjLcGWPijK3vRXg1aWdlNOVOHRq45d7c=
 golang.org/x/net v0.0.0-20210813160813-60bc85c4be6d/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
+golang.org/x/net v0.0.0-20210913180222-943fd674d43e h1:+b/22bPvDYt4NPDcy4xAGCmON713ONAWFeY3Z7I3tR8=
+golang.org/x/net v0.0.0-20210913180222-943fd674d43e/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20181017192945-9dcd33a902f4/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20181203162652-d668ce993890/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
@@ -1219,6 +1241,7 @@ golang.org/x/sys v0.0.0-20190606203320-7fc4e5ec1444/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20190624142023-c5567b49c5d0/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190626221950-04f50cda93cb/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190726091711-fc99dfbffb4e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190826190057-c7b8b68b1456/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190904154756-749cb33beabd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190924154521-2837fb4f24fe/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -1265,8 +1288,11 @@ golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20210511113859-b0526f3d8744/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210816183151-1e6c022a8912 h1:uCLL3g5wH2xjxVREVuAbP9JM5PPKjRbXKRa6IBjkzmU=
 golang.org/x/sys v0.0.0-20210816183151-1e6c022a8912/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20210910150752-751e447fb3d0 h1:xrCZDmdtoloIiooiA9q0OQb9r8HejIHYoHGhGCe1pGg=
+golang.org/x/sys v0.0.0-20210910150752-751e447fb3d0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@@ -1281,6 +1307,7 @@ golang.org/x/time v0.0.0-20180412165947-fbb02b2291d2/go.mod h1:tRJNPiyCQ0inRvYxb
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20191024005414-555d28b269f0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
+golang.org/x/time v0.0.0-20201208040808-7e3f01d25324/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/tools v0.0.0-20180221164845-07fd8470d635/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20180828015842-6cd1fcedba52/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=

+ 1 - 0
main.go

@@ -39,6 +39,7 @@ func main() {
 		Flags:       cmd.MainFlags(),
 		Commands: []cli.Command{
 			cmd.Join(l),
+			cmd.API(l),
 		},
 
 		Action: cmd.Main(l),

+ 25 - 13
pkg/blockchain/ledger.go

@@ -13,7 +13,7 @@ import (
 
 type Ledger struct {
 	sync.Mutex
-	Blockchain Blockchain
+	blockchain Blockchain
 
 	maxChainSize int
 	channel      io.Writer
@@ -30,7 +30,7 @@ func (l *Ledger) newGenesis() {
 	t := time.Now()
 	genesisBlock := Block{}
 	genesisBlock = Block{0, t.String(), map[string]Data{}, genesisBlock.Checksum(), ""}
-	l.Blockchain = append(l.Blockchain, genesisBlock)
+	l.blockchain = append(l.blockchain, genesisBlock)
 }
 
 // Syncronizer starts a goroutine which
@@ -43,15 +43,15 @@ func (l *Ledger) Syncronizer(ctx context.Context, t time.Duration) {
 			select {
 			case <-t.C:
 				l.Lock()
-				bytes, err := json.Marshal(l.Blockchain)
+				bytes, err := json.Marshal(l.blockchain)
 				if err != nil {
 					log.Println(err)
 				}
 				l.channel.Write(bytes)
 
 				// Reset blockchain if we exceed chainsize
-				if l.maxChainSize != 0 && len(l.Blockchain) > l.maxChainSize {
-					l.Blockchain = []Block{}
+				if l.maxChainSize != 0 && len(l.blockchain) > l.maxChainSize {
+					l.blockchain = []Block{}
 				}
 				l.Unlock()
 			case <-ctx.Done():
@@ -63,7 +63,7 @@ func (l *Ledger) Syncronizer(ctx context.Context, t time.Duration) {
 
 // String returns the blockchain as string
 func (l *Ledger) String() string {
-	bytes, _ := json.MarshalIndent(l.Blockchain, "", "  ")
+	bytes, _ := json.MarshalIndent(l.blockchain, "", "  ")
 	return string(bytes)
 }
 
@@ -77,8 +77,8 @@ func (l *Ledger) Update(h *hub.Message) (err error) {
 	}
 
 	l.Lock()
-	if chain.IsMoreRecent(l.Blockchain) {
-		l.Blockchain = chain
+	if chain.IsMoreRecent(l.blockchain) {
+		l.blockchain = chain
 	}
 	l.Unlock()
 
@@ -106,7 +106,7 @@ func (l *Ledger) Announce(ctx context.Context, t time.Duration, async func()) {
 }
 
 func (l *Ledger) lastBlock() Block {
-	return (l.Blockchain[len(l.Blockchain)-1])
+	return (l.blockchain[len(l.blockchain)-1])
 }
 
 // GetKey retrieve the current key from the blockchain
@@ -114,7 +114,7 @@ func (l *Ledger) GetKey(s string) (value Data, exists bool) {
 	l.Lock()
 	defer l.Unlock()
 
-	if len(l.Blockchain) > 0 {
+	if len(l.blockchain) > 0 {
 		last := l.lastBlock()
 		value, exists = last.Storage[s]
 		if exists {
@@ -129,7 +129,7 @@ func (l *Ledger) GetKey(s string) (value Data, exists bool) {
 func (l *Ledger) Exists(f func(Data) bool) (exists bool) {
 	l.Lock()
 	defer l.Unlock()
-	if len(l.Blockchain) > 0 {
+	if len(l.blockchain) > 0 {
 		for _, bv := range l.lastBlock().Storage {
 			if f(bv) {
 				exists = true
@@ -141,6 +141,18 @@ func (l *Ledger) Exists(f func(Data) bool) (exists bool) {
 	return
 }
 
+func (l *Ledger) CurrentData() map[string]Data {
+	l.Lock()
+	defer l.Unlock()
+	return l.lastBlock().Storage
+}
+
+func (l *Ledger) BlockChain() Blockchain {
+	l.Lock()
+	defer l.Unlock()
+	return l.blockchain
+}
+
 // Add data to the blockchain
 func (l *Ledger) Add(s map[string]Data) {
 	l.Lock()
@@ -157,11 +169,11 @@ func (l *Ledger) writeData(s map[string]Data) {
 
 	if newBlock.IsValid(l.lastBlock()) {
 		l.Lock()
-		l.Blockchain = append(l.Blockchain, newBlock)
+		l.blockchain = append(l.blockchain, newBlock)
 		l.Unlock()
 	}
 
-	bytes, err := json.Marshal(l.Blockchain)
+	bytes, err := json.Marshal(l.blockchain)
 	if err != nil {
 		log.Println(err)
 	}