IOTAProxy 筆記

Introduction

在 IOTA Tangle 上發起一筆交易，必須歷經以下四個步驟：

• 簽名 (signature)
• 驗證 2 個之前的交易 (Tips selection)
• POW (Attach To Tangle)
• 廣播 (Broadcast)

其中只有 簽名 (signature) 會在 local (錢包端) 執行，其餘 3 個步驟皆以 Restful API 的方式對 IOTA node 進行 request/response. 而 IOTAProxy（此為 fork 後修改過的版本) 專案利用這個特性，將：驗證 2 個之前的交易 (Tips selection) 或 POW (Attach To Tangle) 等loading 較大的 API 進行轉發.

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PS. 官方版的 iotaproxy 專案目的正好與修改過的版本相反，官方版其目的在於將 POW (Attach To Tangle) 以外的所有 API 轉發，POW 則留在 local 端的 node 運作，此為因應 LightWallet 上的 light node 皆不支援 POW (Attach To Tangle) 的關係。

Installation

• Clone this repository:
  $ git clone https://github.com/TimSamshuijzen/iotaproxy
• Enter the "iotaproxy" directory:
  $ cd iotaproxy
• Install dependencies:
  $ npm install

Configuration

Edit index.js to set preferred connection settings. For example:

• host: proxy target host
• port: proxy target port
• localPort: local IRI API port

var iotaProxy = require('./lib/iotaproxy.js');
iotaProxy.start(
  {
    host: 'http://iota.bitfinex.com', 
    port: 80, 
    localPort: 14266,
    overrideAttachToTangle: true
  }
);

Run

Run the proxy server:
$ node index.js

IOTA proxy server started
Listing on port 14266
Relaying requests to iota.bitfinex.com:80  

Test with console Wallet

您可以透過修改一個錢包來確認您的交易是否有真的被 Relay.

Install Wallet

• Clone Wallet repo.
  $ git clone https://github.com/bahamapascal/CL-Wallet.git

• Modify to measure POW duration
  $ vi Wallet.py
  Search with api.send_transfer:

  ​​  current_milli_time_0 = datetime.now().microsecond
  
  ​​  api.send_transfer(
  ​​      depth=7,
  ​​      transfers=prepared_transferes,
  ​​      change_address=change_addy,
  ​​      min_weight_magnitude=15
  ​​      )
  
  ​​  current_milli_time_1 = datetime.now().microsecond
  ​​  total_ms = current_milli_time_1 - current_milli_time_0
  
  ​​  print("POW cost " + str(total_ms) + " milliseconds.")
  
  

• Run
  $ cd CL-Wallet
$ python Wallet.py

• Resule

  • ASUS Tinker Board
    iota.adapter.BadApiResponse: 400 response from node: This operations cannot be executed: The subtangle has not been updated yet.
  • Relay to node.deviceproof.org
    Relay: Transaction compleated! Cost: 35116 milliseconds.

Test with Restful API

You can clone all the test script as below from iotaproxy_test_script

Local hardware	Relay hardware
ASUS Tinker Board	IBM X3550 M4 (7914-IA4)

API Command	Local duration(ms)	Relay duration(ms)
getNodeInfo	1	0
getNeighbors	5	3
getTips	107	28
findTransactions	3	2
getBalances	2	1
getTransactionsToApprove	38574	1
attachToTangle	8326	190
broadcastTransactions	1057	32

IOTAProxy in i-Certificate Architecture

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