A basic implementation of Blockchain

GoChain

A basic implementation of blockchain in go.

Building

$ cd cmd
$ go build -o gochain

Usage

Starting a node

You can start as many nodes as you want with the following command

./gochain -port=<port-number>

Endpoints

Requesting the Blockchain of a node

  • GET 127.0.0.1:8000/chain

Mining some coins

  • GET 127.0.0.1:8000/mine

Adding a new transaction

  • POST 127.0.0.1:8000/transactions/new

  • Body: A transaction to be added

    {
  "sender": "sender-address-te33412uywq89234g",
  "recipient": "recipient-address-j3h45jk23hjk543gf",
  "amount": 1000
}

Register a new node in the network

Currently you must add each new node to each running node.

  • POST 127.0.0.1:8000/nodes/register

  • Body: A list of nodes to add

    {
   "nodes": ["http://127.0.0.1:8001", <more-nodes>]
}

Resolving Blockchain differences in each node

  • GET 127.0.0.1:8000/nodes/resolve
Owner
Cristian Adamo
Cristian Adamo
https://github.com/crisadamo/gochain
Comments
  • Package issue?

    Package issue?

    Hi Cristian, I get the following error when I build. Thank you for clue.

    gochain/cmd(master*) » go build -o gobuild
    main.go:6:5: cannot find package "github.com/crisadamo/gochain" in any of: /usr/local/Cellar/go/1.8.1/libexec/src/github.com/crisadamo/gochain (from $GOROOT) /Users/eos/go/src/github.com/crisadamo/gochain (from $GOPATH)

  • Hashing of blocks is not working

    Hashing of blocks is not working

    Hi,

    Nice project. Was working on a Go Blockchain implementation myself and noticed that your hashing always returns the same hash, throughout the entire chain.

    The thing is that you are trying to hash a block with binary.Write(&buf, binary.BigEndian, block) which gives you an error you don't handle. The data for binary.Write must be a fixed-size value, your Block contains a string which isn't fixed size.

    I've made a workaround by marshalling the block first, that way the binary.Write succeeds and your hashing the chain properly. It is a bit slow though, if you'll find a better solution, drop me a line.

    You can see it here, feel free to use it: https://github.com/Grrrben/gocoin/blob/master/blockchain.go#L55

    Cheers.

  • corrects readme and fixes headers not being written correctly

    corrects readme and fixes headers not being written correctly

    The command to run the script with a non-default port needed to be ./gochain -port=5000 instead of ./gochain 5000.

    Also, in order for the HTTP response to be encoded correctly, in the buildResponse function, w.Header().Set("Content-Type", "application/json") needs to come before w.WriteHeader(resp.statusCode)

  • Missing previous hash

    Missing previous hash

    Looks like you're not supplying the previous hash when mining?

    https://github.com/crisadamo/gochain/blob/fc3aa97147b0634d043c56db4ef6900ee3116cce/handler.go#L100

    Awesome work - this is a really useful resource!

  • Cannot find Package Error

    Cannot find Package Error

    Hi there, I was going through your code. However , i am not able to run the go code.

    When i run : go build -o gochain

    ERROR:

    main.go:6:5: cannot find package "github.com/crisadamo/gochain" in any of: /usr/local/go/src/github.com/crisadamo/gochain (from $GOROOT) ($GOPATH not set

    Please mind that i have just started with this technology. Kindly Help. Good Day!

  • HTTP is slow, switch to rpc

    HTTP is slow, switch to rpc

    Switch form HTTP too RPC to increase the performance of every request and you get a lot of additional features which HTTP don't have.

    This project seems pretty interesting. I can offer you my help to speed up the development process.

    contact me anytime ;)

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