创建与 nginx 通信的 C++ 应用程序的最佳方法
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Best method to create a c++ app to communicate with nginx
提问by Vivek Goel
I need to write a C++ interface that can read our data structure and provide the o/p based on query using http protocol.
我需要编写一个 C++ 接口，它可以读取我们的数据结构并使用 http 协议提供基于查询的 o/p。
Server Need
It should be able to serve 100 clients at the same time.
服务器需求
它应该能够同时为 100 个客户端提供服务。
Why C++
All code is already written in C++. So we need to just write a http layer in C++. That's why I am choosing C++ instead of a more conventional web-programming language.
为什么是 C++
所有代码都已经用 C++ 编写了。所以我们只需要在 C++ 中编写一个 http 层即可。这就是为什么我选择 C++ 而不是更传统的网络编程语言。
I am thinking to use nginx to serve static files and use its proxy pass to communicate with C++.
我正在考虑使用 nginx 来提供静态文件并使用其代理传递与 C++ 进行通信。
There are two approaches I have found:
我发现有两种方法：
Write a FastCGI c++ module.
Write a node.js c++ module.
Please just any other suggestion if you have
编写一个 FastCGI c++ 模块。
编写一个 node.js c++ 模块。
如果您有任何其他建议，请
Can you please list the pros and cons for each method based on prior experience?
您能否根据先前的经验列出每种方法的优缺点？
采纳答案by Vivek Goel
I think I will go forward with Nginx module devlopment http://www.evanmiller.org/nginx-modules-guide.html
我想我会继续 Nginx 模块开发http://www.evanmiller.org/nginx-modules-guide.html
Why ?
为什么 ？
- It don't require any other library dependency like fastcgi and other.
- I can use all feature of nginx inside my module.
- 它不需要任何其他库依赖项，如 fastcgi 和其他。
- 我可以在我的模块中使用 nginx 的所有功能。
回答by Christopher Smith
No one here seems to have addressed the actual question, though some nice work arounds have been offered. I've been able to build C++ modules for nginx with a couple of minor changes.
尽管已经提供了一些不错的解决方法，但似乎没有人解决实际问题。我已经能够通过一些小的更改为 nginx 构建 C++ 模块。
- Change the module source file name to end with .cpp so gcc realizes it is dealing with C++.
- Make sure all your nginx includes (e.g. ngx_config.h, ngx_core.h, etc.) are wrapped with an extern "C" { } structure. Similarly make sure any functions called through nginx function pointers are declared with a wrapper.
- Add --with-ld-opt="-lstdc++" to your "configure" invocation when setting up nginx.
- 将模块源文件名更改为以 .cpp 结尾，以便 gcc 意识到它正在处理 C++。
- 确保所有 nginx 包含（例如 ngx_config.h、ngx_core.h 等）都用 extern "C" { } 结构包裹。同样，确保通过 nginx 函数指针调用的任何函数都使用包装器声明。
- 设置 nginx 时，将 --with-ld-opt="-lstdc++" 添加到“配置”调用中。
With those three steps your module should compile, build, link, and actually work.
通过这三个步骤，您的模块应该可以编译、构建、链接并实际工作。
回答by Kimmeh
What you are asking is basically how to turn the c++ process that holds your data strutures into a webserver. That might not be the best way to go about it. (Then again, maybe it is in your situation. It depends on the complexity of the c++ process's interfaces you are trying to expose i guess.)
您要问的基本上是如何将保存数据结构的 C++ 进程转换为网络服务器。这可能不是最好的方法。（话又说回来，也许这在你的情况下。这取决于你试图公开的 C++ 进程接口的复杂性，我猜。）
Anyways, I would try to stick a small http frontend in between the c++ process and the clients that could do the http work and communicate with the c++ backend process using some simple messaging protocol like ZeroMQ/zmq.
无论如何，我会尝试在 c++ 进程和可以执行 http 工作并使用一些简单的消息传递协议（如ZeroMQ/zmq ）与 c++ 后端进程通信的客户端之间插入一个小的 http 前端。
zmqin c/c++ is fairly straight forward, and its very efficient and very fast. Using zmq you could very quickly setup a simple webserver frontend in python, or whatever language you prefer that has zmq bindings, and have that frontend communicate asyncronously or syncronously with the backend c++ process using zmq.
c/c++ 中的zmq相当简单，而且非常高效和快速。使用 zmq，您可以非常快速地在 python 中设置一个简单的网络服务器前端，或者您喜欢的任何具有zmq 绑定的语言，并让该前端使用 zmq 与后端 c++ 进程异步或同步通信。
The c++ examplesand the guideare nice starting points if you are looking into using zmq.
如果您正在考虑使用 zmq ，c++ 示例和指南是不错的起点。
For Node.js there are also a few examples.
对于 Node.js 也有一些例子。
回答by Peter
Try G-WAN, it allows you to use your c++ application directly.
试试 G-WAN，它允许你直接使用你的 C++ 应用程序。
回答by Oktaheta
You may try nginx c function
你可以试试nginx c 函数
It is simple to use and built in nginx cache memory on apps layer, wiki for nginx c function
使用简单，应用层内置nginx缓存，nginx c函数wiki
Sample code:
示例代码：
#include <stdio.h>
#include <ngx_http_c_func_module.h>
/*** build the program as .so library and copy to the preferred place for nginx to link this library ***/
/*** gcc -shared -o libcfuntest.so -fPIC cfuntest.c ***/
/*** cp libcfuntest.so /etc/nginx/ ***/
int is_service_on = 0;
void ngx_http_c_func_init(ngx_http_c_func_ctx_t* ctx) {
ngx_http_c_func_log(info, ctx, "%s", "Starting The Application");
is_service_on=1;
}
void my_app_simple_get_greeting(ngx_http_c_func_ctx_t *ctx) {
ngx_http_c_func_log_info(ctx, "Calling back and log from my_app_simple_get");
ngx_http_c_func_write_resp(
ctx,
200,
"200 OK",
"text/plain",
"greeting from ngx_http_c_func testing"
);
}
void my_app_simple_get_args(ngx_http_c_func_ctx_t *ctx) {
ngx_http_c_func_log_info(ctx, "Calling back and log from my_app_simple_get_args");
ngx_http_c_func_write_resp(
ctx,
200,
"200 OK",
"text/plain",
ctx->req_args
);
}
void my_app_simple_get_token_args(ngx_http_c_func_ctx_t *ctx) {
ngx_http_c_func_log_info(ctx, "Calling back and log from my_app_simple_get_token_args");
char * tokenArgs = ngx_http_c_func_get_query_param(ctx, "token");
if (! tokenArgs) {
ngx_http_c_func_write_resp(
ctx,
401,
"401 unauthorized",
"text/plain",
"Token Not Found"
);
} else {
ngx_http_c_func_write_resp(
ctx,
401,
"401 unauthorized",
"text/plain",
tokenArgs
);
}
}
void my_app_simple_post(ngx_http_c_func_ctx_t *ctx) {
ngx_http_c_func_log_info(ctx, "Calling back and log from my_app_simple_post");
ngx_http_c_func_write_resp(
ctx,
202,
"202 Accepted and Processing",
"text/plain",
ctx->req_body
);
}
void my_app_simple_get_no_resp(ngx_http_c_func_ctx_t *ctx) {
ngx_http_c_func_log_info(ctx, "Calling back and log from my_app_simple_get_no_resp");
}
void ngx_http_c_func_exit(ngx_http_c_func_ctx_t* ctx) {
ngx_http_c_func_log(info, ctx, "%s\n", "Shutting down The Application");
is_service_on = 0;
}
