此项目是整个AI图片 识别项目 的API接口端
原本是作为商业项目开发的，但项目未上线就宣告结束了，出于共同学习的目的，开源此项目
因为项目并未真正上线运营，所以有一些不足或考虑不周全之处请自行忽略，若发现错误，还请指正。
用户管理系统&业务官网源码请移步至 https://github.com/hookover/aiocr-web.git
根据预期业务，将接口设计为：承载每天2000万张图片上传并相应处理的API
/servers | 获取服务器列表
/user/login | 登录 /user/point?token=:token | 获取用户剩余积分
/decode/upload-base64?token=:token | 以base64字符串方式上传图片 /decode/upload?token=:token | 以form-data数据流方式上传图片
/result?token=:token | 获取识别结果 /report?token=:token | 若图片识别错误，可报错
接口的详细使用，请搭建https://github.com/hookover/aiocr-web.git 后点击API文档查看
高并发、高性能、安全稳定、最佳实践方案
RESTful规范
JWT，加密算法修改为了最快的SHA256
REDIS长连接，测试了memcached
高性能自增ID生成器：php_snowflke (测试每秒生成10万+不重复ID)
性能分析工具使用的是xhprof
APIDOC 根据代码注释自动生成API文档
MYSQL事件+存储过程 将上传图片日志表自动按天分区，并删除7天之前的分区
MYSQL事件+存储过程 自动统计每个用户/开发工程师每天产生的数据
自定义Auth,将token验证放到了Auth服务模块中
定义了日志服务
统一的API响应错误代码机制
自增ID采用2个数据字段存储，并使用联合索引提升性能
SQL语句优化 还有一些细节已经忘记了
1、 为php安装此扩展 https://github.com/hookover/php_snowflake.git
2、 克隆此代码并composer安装代码依赖
3、 配置nginx/apache 参考lumen的配置
4、 cp .env.example .env
5、 项目数据表的创建和基础数据在这里： https://github.com/hookover/aiocr-web.git，建议先搭建业务系统再搭建API
借助xhprof查看性能瓶颈，根据性能瓶颈提出解决方案，并实施，最终实现单个API请求处理在10ms左右，数据并发起来，业务逻辑也不会出现任何问题。
个人认为，要想让整个系统实现高并发，需要从软件到硬件再到服务器架构配置做好全面协调，任何一个地方的短板都可能成为整个系统的短板。
代码层面无非就是减少对数据库的读写压力、将一些频繁数据放入缓存，PHP到缓存到数据库都通过长连接提高连接速度，数据库表合理的使用好索引，注意SQL质量和调整好一些耗费资源的算法。
服务器软件配置方面又会涉及到LINUX本身的优化，服务软件之间的协调，数据库之间的协调，负载均衡等。
硬件层面又需要考虑CPU瓶颈，硬盘读写性能，内存大小，服务器间网络通信状况等..
开发机： Intel® Core™ i7-4770 CPU @ 3.40GHz × 8 + 15.6 GiB 内存
环境：ubuntu + nginx + php7 + php-fpm tcp
压测工具： ab
开发机上同时运行了phpstorm，网页等
nginx和php-fpm是使用的apt安装后的默认配置，未做深入调优
若需要下载代码自己压测，或者真正到线上运行， 还需要调整nginx、php、php-fpm、mysql、redis的配置，以便让这些服务器软件协同工作。
测试数据：
100并发1万次
Server Software: nginx/1.12.2
Server Hostname: api.decaptcha.com
Server Port: 80
Document Path: /v2/decode/upload-base64?file=data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAMAAAARCA0dGVyY4LQCQAAABFXKwAAAABJRU5ErkJggg==&token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpZCI6MTk4NjkxOCwiZXhwIjoxNTIxNzAwMDY0fQ.tFbzUwqI5VU1oENTJWOqYLNGb5bg4Yh-L7rsIvRDe2M
Document Length: 82 bytes
Concurrency Level: 100
Time taken for tests: 10.254 seconds
Complete requests: 10000
Failed requests: 0
Total transferred: 2450000 bytes
HTML transferred: 820000 bytes
Requests per second: 975.25 [#/sec] (mean)
Time per request: 102.537 [ms] (mean)
Time per request: 1.025 [ms] (mean, across all concurrent requests)
Transfer rate: 233.34 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.2 0 4
Processing: 6 102 267.1 31 4582
Waiting: 6 102 267.1 31 4582
Total: 6 102 267.1 31 4583
200并发10万次
Server Software: nginx/1.12.2
Server Hostname: api.decaptcha.com
Server Port: 80
Document Path: /v2/decode/upload-base64?file=data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAMAAAARCA0dGVyY4LQCQAAABFXKwAAAABJRU5ErkJggg==&token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpZCI6MTk4NjkxOCwiZXhwIjoxNTIxNzAwMDY0fQ.tFbzUwqI5VU1oENTJWOqYLNGb5bg4Yh-L7rsIvRDe2M
Document Length: 82 bytes
Concurrency Level: 200
Time taken for tests: 104.265 seconds
Complete requests: 100000
Failed requests: 17
(Connect: 0, Receive: 0, Length: 17, Exceptions: 0)
Non-2xx responses: 17
Total transferred: 24501853 bytes
HTML transferred: 8201717 bytes
Requests per second: 959.09 [#/sec] (mean)
Time per request: 208.531 [ms] (mean)
Time per request: 1.043 [ms] (mean, across all concurrent requests)
Transfer rate: 229.49 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.2 0 3
Processing: 6 208 1630.6 43 60001
Waiting: 6 208 1630.6 43 60001
Total: 6 208 1630.6 44 60001
500并发，10万次
Server Software: nginx/1.12.2
Server Hostname: api.decaptcha.com
Server Port: 80
Document Path: /v2/decode/upload-base64?file=data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAMAAAARCA0dGVyY4LQCQAAABFXKwAAAABJRU5ErkJggg==&token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpZCI6MTk4NjkxOCwiZXhwIjoxNTIxNzAwMDY0fQ.tFbzUwqI5VU1oENTJWOqYLNGb5bg4Yh-L7rsIvRDe2M
Document Length: 82 bytes
Concurrency Level: 500
Time taken for tests: 106.200 seconds
Complete requests: 100000
Failed requests: 114
(Connect: 0, Receive: 0, Length: 114, Exceptions: 0)
Non-2xx responses: 114
Total transferred: 24511451 bytes
HTML transferred: 8210864 bytes
Requests per second: 941.62 [#/sec] (mean)
Time per request: 531.001 [ms] (mean)
Time per request: 1.062 [ms] (mean, across all concurrent requests)
Transfer rate: 225.39 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.7 0 14
Processing: 5 530 3091.5 151 63039
Waiting: 5 530 3091.5 151 63039
Total: 5 530 3091.9 151 63049
1000并发1万次
Server Software: nginx/1.12.2
Server Hostname: api.decaptcha.com
Server Port: 80
Document Path: /v2/decode/upload-base64?file=data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAMAAAARCA0dGVyY4LQCQAAABFXKwAAAABJRU5ErkJggg==&token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpZCI6MTk4NjkxOCwiZXhwIjoxNTIxNzAwMDY0fQ.tFbzUwqI5VU1oENTJWOqYLNGb5bg4Yh-L7rsIvRDe2M
Document Length: 82 bytes
Concurrency Level: 1000
Time taken for tests: 27.926 seconds
Complete requests: 10000
Failed requests: 64
(Connect: 0, Receive: 0, Length: 64, Exceptions: 0)
Non-2xx responses: 64
Total transferred: 2456016 bytes
HTML transferred: 825824 bytes
Requests per second: 358.09 [#/sec] (mean)
Time per request: 2792.559 [ms] (mean)
Time per request: 2.793 [ms] (mean, across all concurrent requests)
Transfer rate: 85.89 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 2 6.7 0 27
Processing: 62 1170 3005.8 256 27883
Waiting: 62 1170 3005.8 256 27883
Total: 62 1172 3008.8 256 27906
