话说微软有吹过YARP，Nginx替代
ASP.NET and .NET框架做的，话说微软有被没收105.8万么
https://www.cnblogs.com/Leo_wl/p/15877853.html

200行naivechain
1。package.json

{
  "name": "naivechain",
  "version": "1.0.0",
  "description": "",
  "scripts": {
    "start": "node main.js"
  },
  "dependencies": {
    "body-parser": "^1.15.2",
    "crypto-js": "^3.1.6",
    "express": "~4.11.1",
    "ws": "^1.1.0"
  },
  "engines": {
    "node": ">=4.3.2"
  }
}

2。main.js

'use strict';
var CryptoJS = require("crypto-js");
var express = require("express");
var bodyParser = require('body-parser');
var WebSocket = require("ws");

var http_port = process.env.HTTP_PORT || 3001;
var p2p_port = process.env.P2P_PORT || 6001;
var initialPeers = process.env.PEERS ? process.env.PEERS.split(',') : [];

class Block {
    constructor(index, previousHash, timestamp, data, hash) {
        this.index = index;
        this.previousHash = previousHash.toString();
        this.timestamp = timestamp;
        this.data = data;
        this.hash = hash.toString();
    }
}

var sockets = [];
var MessageType = {
    QUERY_LATEST: 0,
    QUERY_ALL: 1,
    RESPONSE_BLOCKCHAIN: 2
};

var getGenesisBlock = () => {
    return new Block(0, "0", 1465154705, "my genesis block!!", "816534932c2b7154836da6afc367695e6337db8a921823784c14378abed4f7d7");
};

var blockchain = [getGenesisBlock()];

var initHttpServer = () => {
    var app = express();
    app.use(bodyParser.json());

    app.get('/blocks', (req, res) => res.send(JSON.stringify(blockchain)));
    app.post('/mineBlock', (req, res) => {
        var newBlock = generateNextBlock(req.body.data);
        addBlock(newBlock);
        broadcast(responseLatestMsg());
        console.log('block added: ' + JSON.stringify(newBlock));
        res.send();
    });
    app.get('/peers', (req, res) => {
        res.send(sockets.map(s => s._socket.remoteAddress + ':' + s._socket.remotePort));
    });
    app.post('/addPeer', (req, res) => {
        connectToPeers([req.body.peer]);
        res.send();
    });
    app.listen(http_port, () => console.log('Listening http on port: ' + http_port));
};


var initP2PServer = () => {
    var server = new WebSocket.Server({port: p2p_port});
    server.on('connection', ws => initConnection(ws));
    console.log('listening websocket p2p port on: ' + p2p_port);

};

var initConnection = (ws) => {
    sockets.push(ws);
    initMessageHandler(ws);
    initErrorHandler(ws);
    write(ws, queryChainLengthMsg());
};

var initMessageHandler = (ws) => {
    ws.on('message', (data) => {
        var message = JSON.parse(data);
        console.log('Received message' + JSON.stringify(message));
        switch (message.type) {
            case MessageType.QUERY_LATEST:
                write(ws, responseLatestMsg());
                break;
            case MessageType.QUERY_ALL:
                write(ws, responseChainMsg());
                break;
            case MessageType.RESPONSE_BLOCKCHAIN:
                handleBlockchainResponse(message);
                break;
        }
    });
};

var initErrorHandler = (ws) => {
    var closeConnection = (ws) => {
        console.log('connection failed to peer: ' + ws.url);
        sockets.splice(sockets.indexOf(ws), 1);
    };
    ws.on('close', () => closeConnection(ws));
    ws.on('error', () => closeConnection(ws));
};


var generateNextBlock = (blockData) => {
    var previousBlock = getLatestBlock();
    var nextIndex = previousBlock.index + 1;
    var nextTimestamp = new Date().getTime() / 1000;
    var nextHash = calculateHash(nextIndex, previousBlock.hash, nextTimestamp, blockData);
    return new Block(nextIndex, previousBlock.hash, nextTimestamp, blockData, nextHash);
};


var calculateHashForBlock = (block) => {
    return calculateHash(block.index, block.previousHash, block.timestamp, block.data);
};

var calculateHash = (index, previousHash, timestamp, data) => {
    return CryptoJS.SHA256(index + previousHash + timestamp + data).toString();
};

var addBlock = (newBlock) => {
    if (isValidNewBlock(newBlock, getLatestBlock())) {
        blockchain.push(newBlock);
    }
};

var isValidNewBlock = (newBlock, previousBlock) => {
    if (previousBlock.index + 1 !== newBlock.index) {
        console.log('invalid index');
        return false;
    } else if (previousBlock.hash !== newBlock.previousHash) {
        console.log('invalid previoushash');
        return false;
    } else if (calculateHashForBlock(newBlock) !== newBlock.hash) {
        console.log(typeof (newBlock.hash) + ' ' + typeof calculateHashForBlock(newBlock));
        console.log('invalid hash: ' + calculateHashForBlock(newBlock) + ' ' + newBlock.hash);
        return false;
    }
    return true;
};

var connectToPeers = (newPeers) => {
    newPeers.forEach((peer) => {
        var ws = new WebSocket(peer);
        ws.on('open', () => initConnection(ws));
        ws.on('error', () => {
            console.log('connection failed')
        });
    });
};

var handleBlockchainResponse = (message) => {
    var receivedBlocks = JSON.parse(message.data).sort((b1, b2) => (b1.index - b2.index));
    var latestBlockReceived = receivedBlocks[receivedBlocks.length - 1];
    var latestBlockHeld = getLatestBlock();
    if (latestBlockReceived.index > latestBlockHeld.index) {
        console.log('blockchain possibly behind. We got: ' + latestBlockHeld.index + ' Peer got: ' + latestBlockReceived.index);
        if (latestBlockHeld.hash === latestBlockReceived.previousHash) {
            console.log("We can append the received block to our chain");
            blockchain.push(latestBlockReceived);
            broadcast(responseLatestMsg());
        } else if (receivedBlocks.length === 1) {
            console.log("We have to query the chain from our peer");
            broadcast(queryAllMsg());
        } else {
            console.log("Received blockchain is longer than current blockchain");
            replaceChain(receivedBlocks);
        }
    } else {
        console.log('received blockchain is not longer than current blockchain. Do nothing');
    }
};

var replaceChain = (newBlocks) => {
    if (isValidChain(newBlocks) && newBlocks.length > blockchain.length) {
        console.log('Received blockchain is valid. Replacing current blockchain with received blockchain');
        blockchain = newBlocks;
        broadcast(responseLatestMsg());
    } else {
        console.log('Received blockchain invalid');
    }
};

var isValidChain = (blockchainToValidate) => {
    if (JSON.stringify(blockchainToValidate[0]) !== JSON.stringify(getGenesisBlock())) {
        return false;
    }
    var tempBlocks = [blockchainToValidate[0]];
    for (var i = 1; i < blockchainToValidate.length; i++) {
        if (isValidNewBlock(blockchainToValidate[i], tempBlocks[i - 1])) {
            tempBlocks.push(blockchainToValidate[i]);
        } else {
            return false;
        }
    }
    return true;
};

var getLatestBlock = () => blockchain[blockchain.length - 1];
var queryChainLengthMsg = () => ({'type': MessageType.QUERY_LATEST});
var queryAllMsg = () => ({'type': MessageType.QUERY_ALL});
var responseChainMsg = () =>({
    'type': MessageType.RESPONSE_BLOCKCHAIN, 'data': JSON.stringify(blockchain)
});
var responseLatestMsg = () => ({
    'type': MessageType.RESPONSE_BLOCKCHAIN,
    'data': JSON.stringify([getLatestBlock()])
});

var write = (ws, message) => ws.send(JSON.stringify(message));
var broadcast = (message) => sockets.forEach(socket => write(socket, message));

connectToPeers(initialPeers);
initHttpServer();
initP2PServer();

1. Dockerfile: 食用指南：docker build -t appname .

FROM node:4.6

RUN mkdir /naivechain
ADD package.json /naivechain/
ADD main.js /naivechain/

RUN cd /naivechain && npm install

EXPOSE 3001
EXPOSE 6001

ENTRYPOINT cd /naivechain && npm install && PEERS=$PEERS npm start

下回分解：

Golang
https://github.com/nosequeldeebee/blockchain-tutorial

package main

import (
    "crypto/sha256"
    "encoding/hex"
    "encoding/json"
    "io"
    "log"
    "net/http"
    "os"
    "strconv"
    "sync"
    "time"

    "github.com/davecgh/go-spew/spew"
    "github.com/gorilla/mux"
    "github.com/joho/godotenv"
)

// Block represents each 'item' in the blockchain
type Block struct {
    Index     int
    Timestamp string
    BPM       int
    Hash      string
    PrevHash  string
}

// Blockchain is a series of validated Blocks
var Blockchain []Block

// Message takes incoming JSON payload for writing heart rate
type Message struct {
    BPM int
}

var mutex = &sync.Mutex{}

func main() {
    err := godotenv.Load()
    if err != nil {
        log.Fatal(err)
    }

    go func() {
        t := time.Now()
        genesisBlock := Block{}
        genesisBlock = Block{0, t.String(), 0, calculateHash(genesisBlock), ""}
        spew.Dump(genesisBlock)

        mutex.Lock()
        Blockchain = append(Blockchain, genesisBlock)
        mutex.Unlock()
    }()
    log.Fatal(run())

}

// web server
func run() error {
    mux := makeMuxRouter()
    httpPort := os.Getenv("PORT")
    log.Println("HTTP Server Listening on port :", httpPort)
    s := &http.Server{
        Addr:           ":" + httpPort,
        Handler:        mux,
        ReadTimeout:    10 * time.Second,
        WriteTimeout:   10 * time.Second,
        MaxHeaderBytes: 1 << 20,
    }

    if err := s.ListenAndServe(); err != nil {
        return err
    }

    return nil
}

// create handlers
func makeMuxRouter() http.Handler {
    muxRouter := mux.NewRouter()
    muxRouter.HandleFunc("/", handleGetBlockchain).Methods("GET")
    muxRouter.HandleFunc("/", handleWriteBlock).Methods("POST")
    return muxRouter
}

// write blockchain when we receive an http request
func handleGetBlockchain(w http.ResponseWriter, r *http.Request) {
    bytes, err := json.MarshalIndent(Blockchain, "", "  ")
    if err != nil {
        http.Error(w, err.Error(), http.StatusInternalServerError)
        return
    }
    io.WriteString(w, string(bytes))
}

// takes JSON payload as an input for heart rate (BPM)
func handleWriteBlock(w http.ResponseWriter, r *http.Request) {
    w.Header().Set("Content-Type", "application/json")
    var msg Message

    decoder := json.NewDecoder(r.Body)
    if err := decoder.Decode(&msg); err != nil {
        respondWithJSON(w, r, http.StatusBadRequest, r.Body)
        return
    }
    defer r.Body.Close()

    mutex.Lock()
    prevBlock := Blockchain[len(Blockchain)-1]
    newBlock := generateBlock(prevBlock, msg.BPM)

    if isBlockValid(newBlock, prevBlock) {
        Blockchain = append(Blockchain, newBlock)
        spew.Dump(Blockchain)
    }
    mutex.Unlock()

    respondWithJSON(w, r, http.StatusCreated, newBlock)

}

func respondWithJSON(w http.ResponseWriter, r *http.Request, code int, payload interface{}) {
    response, err := json.MarshalIndent(payload, "", "  ")
    if err != nil {
        w.WriteHeader(http.StatusInternalServerError)
        w.Write([]byte("HTTP 500: Internal Server Error"))
        return
    }
    w.WriteHeader(code)
    w.Write(response)
}

// make sure block is valid by checking index, and comparing the hash of the previous block
func isBlockValid(newBlock, oldBlock Block) bool {
    if oldBlock.Index+1 != newBlock.Index {
        return false
    }

    if oldBlock.Hash != newBlock.PrevHash {
        return false
    }

    if calculateHash(newBlock) != newBlock.Hash {
        return false
    }

    return true
}

// SHA256 hasing
func calculateHash(block Block) string {
    record := strconv.Itoa(block.Index) + block.Timestamp + strconv.Itoa(block.BPM) + block.PrevHash
    h := sha256.New()
    h.Write([]byte(record))
    hashed := h.Sum(nil)
    return hex.EncodeToString(hashed)
}

// create a new block using previous block's hash
func generateBlock(oldBlock Block, BPM int) Block {

    var newBlock Block

    t := time.Now()

    newBlock.Index = oldBlock.Index + 1
    newBlock.Timestamp = t.String()
    newBlock.BPM = BPM
    newBlock.PrevHash = oldBlock.Hash
    newBlock.Hash = calculateHash(newBlock)

    return newBlock
}