Move js example to js-tmsp/example

This commit is contained in:
Jae Kwon
2016-01-29 11:47:13 -08:00
parent b21c6b5e5b
commit 799ae4c006
6 changed files with 1 additions and 341 deletions

1
example/js/README.md Normal file
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This example has been moved here: https://github.com/tendermint/js-tmsp/tree/master/example

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var server = require("./server");
var wire = require("js-wire");
var util = require("util");
var msg = require("./msgs");
var types = require("./types");
function CounterApp(){
this.hashCount = 0;
this.txCount = 0;
this.serial = false;
};
CounterApp.prototype.info = function(cb) {
return cb(util.format("hashes:%d, txs:%d", this.hashCount, this.txCount));
}
CounterApp.prototype.set_option = function(cb, key, value) {
if (key == "serial" && value == "on") {
this.serial = true;
}
return cb("");
}
CounterApp.prototype.append_tx = function(cb, txBytes) {
if (this.serial) {
if (txBytes.length >= 2 && txBytes.slice(0, 2) == "0x") {
var hexString = txBytes.toString("ascii", 2);
var hexBytes = new Buffer(hexString, "hex");
txBytes = hexBytes;
}
var txValue = txBytes.readIntBE(0, txBytes.length);
if (txValue != this.txCount){
return cb(types.RetCodeInvalidNonce, "", "Nonce is invalid");
}
}
this.txCount += 1;
return cb(types.RetCodeOK, "", "");
}
CounterApp.prototype.check_tx = function(cb, txBytes) {
if (this.serial) {
if (txBytes.length >= 2 && txBytes.slice(0, 2) == "0x") {
var hexString = txBytes.toString("ascii", 2);
var hexBytes = new Buffer(hexString, "hex");
txBytes = hexBytes;
}
var txValue = txBytes.readIntBE(0, txBytes.length);
if (txValue < this.txCount){
return cb(types.RetCodeInvalidNonce, "", "Nonce is too low");
}
}
this.txCount += 1;
return cb(types.RetCodeOK, "", "");
}
CounterApp.prototype.get_hash = function(cb) {
this.hashCount += 1;
if (this.txCount == 0){
return cb("", "Zero tx count; hash is empth");
}
var buf = new Buffer(8);
buf.writeIntBE(this.txCount, 0, 8);
cb(buf, "");
}
CounterApp.prototype.query = function(cb) {
return cb("", "Query not yet supporrted");
}
console.log("Counter app in Javascript");
var app = new CounterApp();
var appServer = new server.AppServer(app);
appServer.server.listen(46658);

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var wire = require("js-wire");
var types = require("./types");
var readRequestInfo = function(r) { return []; };
var readRequestSetOption = function(r) { return [r.readString(), r.readString()]; };
var readRequestAppendTx = function(r) { return [r.readByteArray()]; };
var readRequestCheckTx = function(r) { return [r.readByteArray()]; };
var readRequestGetHash = function(r) { return []; };
var readRequestQuery = function(r) { return [r.readByteArray()]; };
var runOnce = function(name, f) {
var ran = false;
return function() {
if (ran) {
console.log("Error: response was already written for "+name);
return
} else {
ran = true;
}
return f.apply(this, arguments);
};
};
var makeWriteResponseInfo = function(w, cb) { return runOnce("info", function(info) {
w.writeUint8(types.ResponseTypeInfo);
w.writeString(info);
cb(w);
});};
var makeWriteResponseSetOption = function(w, cb) { return runOnce("set_option", function(log) {
w.writeUint8(types.ResponseTypeSetOption);
w.writeString(log);
cb(w);
});};
var makeWriteResponseAppendTx = function(w, cb) { return runOnce("append_tx", function(code, result, log) {
w.writeUint8(types.ResponseTypeAppendTx);
w.writeUint8(code);
w.writeByteArray(result);
w.writeString(log);
cb(w);
});};
var makeWriteResponseCheckTx = function(w, cb) { return runOnce("check_tx", function(code, result, log) {
w.writeUint8(types.ResponseTypeCheckTx);
w.writeUint8(code);
w.writeByteArray(result);
w.writeString(log);
cb(w);
});};
var makeWriteResponseGetHash = function(w, cb) { return runOnce("get_hash", function(hash, log) {
w.writeUint8(types.ResponseTypeGetHash);
w.writeByteArray(hash);
w.writeString(log);
cb(w);
});};
var makeWriteResponseQuery = function(w, cb) { return runOnce("query", function(result, log) {
w.writeUint8(types.ResponseTypeQuery);
w.writeByteArray(result);
w.writeString(log);
cb(w);
});};
module.exports = {
types : {
0x01 : "echo",
0x02 : "flush",
0x03 : "info",
0x04 : "set_option",
0x21 : "append_tx",
0x22 : "check_tx",
0x23 : "get_hash",
0x24 : "query",
},
readers : {
"info": readRequestInfo,
"set_option": readRequestSetOption,
"append_tx": readRequestAppendTx,
"check_tx": readRequestCheckTx,
"get_hash": readRequestGetHash,
"query": readRequestQuery,
},
writerGenerators: {
"info": makeWriteResponseInfo,
"set_option": makeWriteResponseSetOption,
"append_tx": makeWriteResponseAppendTx,
"check_tx": makeWriteResponseCheckTx,
"get_hash": makeWriteResponseGetHash,
"query": makeWriteResponseQuery,
},
};

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{
"name": "example",
"version": "0.0.1",
"description": "Example javascript TMSP application",
"main": "index.js",
"dependencies": {
"js-wire": "0.0.2"
}
}

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var net = require("net");
var wire = require("js-wire");
var msg = require("./msgs");
var types = require("./types");
var maxWriteBufferLength = 4096; // Any more and flush
// Takes an application and handles TMSP connection
// which invoke methods on the app
function AppServer(app){
// set the app for the socket handler
this.app = app;
// create a server by providing callback for
// accepting new connection and callbacks for
// connection events ('data', 'end', etc.)
this.createServer();
}
AppServer.prototype.createServer = function() {
var app = this.app;
// Define the socket handler
this.server = net.createServer(function(socket) {
socket.name = socket.remoteAddress + ":" + socket.remotePort;
console.log("new connection from", socket.name);
var conn = new Connection(socket, function(msgBytes, cb) {
var r = new wire.Reader(msgBytes);
// Now we can decode
var typeByte = r.readByte();
var reqType = msg.types[typeByte];
// Special messages.
// NOTE: msgs are length prefixed
if (reqType == "flush") {
var w = new wire.Writer();
w.writeByte(types.ResponseTypeFlush);
conn.writeMessage(w.getBuffer());
conn.flush();
return cb();
} else if (reqType == "echo") {
var message = r.readString();
var w = new wire.Writer();
w.writeByte(types.ResponseTypeEcho);
w.writeString(message);
conn.writeMessage(w.getBuffer());
return cb();
}
// Make callback by wrapping cp
var resCb = msg.writerGenerators[reqType](new wire.Writer(), function(w) {
conn.writeMessage(w.getBuffer());
return cb();
});
// Decode arguments
var args = msg.readers[reqType](r);
args.unshift(resCb);
// Call function
var res = app[reqType].apply(app, args);
if (res != undefined) {
console.log("Message handler shouldn't return anything!");
}
});
});
}
//----------------------------------------
function Connection(socket, msgCb) {
this.socket = socket;
this.recvBuf = new Buffer(0);
this.sendBuf = new Buffer(0);
this.msgCb = msgCb;
this.waitingResult = false;
var conn = this;
// Handle TMSP requests.
socket.on('data', function(data) {
conn.appendData(data);
});
socket.on('end', function() {
console.log("connection ended");
});
}
Connection.prototype.appendData = function(bytes) {
var conn = this;
if (bytes.length > 0) {
this.recvBuf = Buffer.concat([this.recvBuf, new Buffer(bytes)]);
}
if (this.waitingResult) {
return;
}
var r = new wire.Reader(this.recvBuf);
var msg;
try {
msg = r.readByteArray();
} catch(e) {
return;
}
this.recvBuf = r.buf.slice(r.offset);
this.waitingResult = true;
this.socket.pause();
//try {
this.msgCb(msg, function() {
// This gets called after msg handler is finished with response.
conn.waitingResult = false;
conn.socket.resume();
if (conn.recvBuf.length > 0) {
conn.appendData("");
}
});
//} catch(e) {
// console.log("FATAL ERROR: ", e);
//}
};
Connection.prototype.writeMessage = function(msgBytes) {
var msgLength = wire.uvarintSize(msgBytes.length);
var buf = new Buffer(1+msgLength+msgBytes.length);
var w = new wire.Writer(buf);
w.writeByteArray(msgBytes); // TODO technically should be writeVarint
this.sendBuf = Buffer.concat([this.sendBuf, w.getBuffer()]);
if (this.sendBuf.length >= maxWriteBufferLength) {
this.flush();
}
};
Connection.prototype.flush = function() {
var n = this.socket.write(this.sendBuf);
this.sendBuf = new Buffer(0);
}
//----------------------------------------
module.exports = { AppServer: AppServer };

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module.exports = {
RetCodeOK: 0,
RetCodeInternalError: 1,
RetCodeUnauthorized: 2,
RetCodeInsufficientFees: 3,
RetCodeUnknownRequest: 4,
RetCodeEncodingError: 5,
RetCodeNonce: 6,
RequestTypeEcho: 0x01,
RequestTypeFlush: 0x02,
RequestTypeInfo: 0x03,
RequestTypeSetOption: 0x04,
RequestTypeAppendTx: 0x21,
RequestTypeCheckTx: 0x22,
RequestTypeGetHash: 0x23,
RequestTypeQuery: 0x24,
ResponseTypeEcho: 0x11,
ResponseTypeFlush: 0x12,
ResponseTypeInfo: 0x13,
ResponseTypeSetOption: 0x14,
ResponseTypeAppendTx: 0x31,
ResponseTypeCheckTx: 0x32,
ResponseTypeGetHash: 0x33,
ResponseTypeQuery: 0x34,
};