区块链blockchain教程.zip

### 增加了一些查询功能、可以选择端口的参数 增加一个引入： ``` from argparse import ArgumentParser ``` 启动代码如下： ``` parser = ArgumentParser() parser.add_argument('-p', '--port', default=8080, type=int, help='port to listen on') args = parser.parse_args() port = args.port app.run(debug=True,host='0.0.0.0',port=port) ``` 我们启动区块链 ``` python blockchain.py -p 9090 ``` 访问全部区块： http://localhost:9090/blocks/all ```json [ { "data": "Genesis Block", "hash": "74eaf9085aa458f99c724583e4314b361bae60bff74e4cb82f89c9ecaa671406", "index": 0, "previous_hash": 0, "timestamp": 1533634910741 }, { "data": "hello", "hash": "41c28040287d26d66780f1175606fbf22d6a73c11355c64ae590b32d5e22d61b", "index": 1, "previous_hash": "74eaf9085aa458f99c724583e4314b361bae60bff74e4cb82f89c9ecaa671406", "timestamp": 1533634910741 }, { "data": "hi~", "hash": "45aff7916c3410f9f93ac2a9dbcc24af33caa9120890ce0f1cabe02a3514b106", "index": 2, "previous_hash": "41c28040287d26d66780f1175606fbf22d6a73c11355c64ae590b32d5e22d61b", "timestamp": 1533634910741 }, { "data": "~", "hash": "cd3d295b8c2c168830e24132f58073f2d39cee95fa6ae4d87a8be248fe8eaf3f", "index": 3, "previous_hash": "45aff7916c3410f9f93ac2a9dbcc24af33caa9120890ce0f1cabe02a3514b106", "timestamp": 1533634910741 } ] ``` 访问最新的区块： http://localhost:9090/blocks/last 你能得到类似的结果： ```json { "data": "~", "hash": "5b9d3b614c7e28a330a7ae6517d2132709725e9812dd8b80f7f8e702fd1bc4c3", "index": 3, "previous_hash": "2624e776d1adc8c2b99e42458f69957ab8f66477dff393a1c8f8b6b3da417672", "timestamp": 1533632972579 } ``` 其中index就是区块链的高度 访问index从1～3的区块 http://localhost:9090/blocks/1/3 你能得到类似的结果： ```json [ { "data": "hello", "hash": "bbea6b876254a17d03cf154821be34be2ba782500da2b9310baa9d2f08567181", "index": 1, "previous_hash": "d2c6ff3b8ab521d7837ac64873f7228d9f7e96ce727cec2a815d135545c65f44", "timestamp": 1533634461058 }, { "data": "hi~", "hash": "ad65bd6611bb84416766f231cfc87c86c885ad4f0a12bfa002c40119abd23b23", "index": 2, "previous_hash": "bbea6b876254a17d03cf154821be34be2ba782500da2b9310baa9d2f08567181", "timestamp": 1533634461058 }, { "data": "~", "hash": "b2bc5f8762252de051c06eccd2cadeda43a200f1e834e0033e056b341d0688d6", "index": 3, "previous_hash": "ad65bd6611bb84416766f231cfc87c86c885ad4f0a12bfa002c40119abd23b23", "timestamp": 1533634461058 } ] ``` 访问index为2的区块 http://localhost:9090/blocks/2 你能得到类似的结果： ```json { "data": "hi~", "hash": "ad65bd6611bb84416766f231cfc87c86c885ad4f0a12bfa002c40119abd23b23", "index": 2, "previous_hash": "bbea6b876254a17d03cf154821be34be2ba782500da2b9310baa9d2f08567181", "timestamp": 1533634461058 } ```