尝试使用 curl-multi gem 发出 HTTP 请求时函数“add_to_curl”出错答案

【问题标题】：Error in function 'add_to_curl' when trying to make HTTP-request using curl-multi gem尝试使用 curl-multi gem 发出 HTTP 请求时函数“add_to_curl”出错
【发布时间】：2013-11-17 21:08:04
【问题描述】：

我正在尝试测试“curl-multi”gem 以发出 http 请求：


puts Benchmark.measure {
  require 'curl-multi'
  # make multiple GET requests
  easy_options = {:follow_location => true}
  multi_options = {:pipeline => true}

  Curl::Multi.get("http://www.google.com/","http://www.google.com/","http://www.google.com/", easy_options, multi_options) do|easy|
    # do something interesting with the easy response
    puts easy.last_effective_url
  end
}

但是有一个奇怪的错误：


/Users/bmalets/.rvm/gems/ruby-1.9.3-p448/gems/curl-multi-0.2/lib/curl-multi.rb: In function ‘add_to_curl’:
/Users/bmalets/.rvm/gems/ruby-1.9.3-p448/gems/curl-multi-0.2/lib/curl-multi.rb:238: warning: ISO C90 forbids mixed declarations and code
/Users/bmalets/.rvm/gems/ruby-1.9.3-p448/gems/curl-multi-0.2/lib/curl-multi.rb:243: error: ‘struct RString’ has no member named ‘len’
/Users/bmalets/.rvm/gems/ruby-1.9.3-p448/gems/curl-multi-0.2/lib/curl-multi.rb: In function ‘c_select’:
/Users/bmalets/.rvm/gems/ruby-1.9.3-p448/gems/curl-multi-0.2/lib/curl-multi.rb:287: error: ‘struct RArray’ has no member named ‘len’
/Users/bmalets/.rvm/gems/ruby-1.9.3-p448/gems/curl-multi-0.2/lib/curl-multi.rb:288: error: ‘struct RArray’ has no member named ‘ptr’
/Users/bmalets/.rvm/gems/ruby-1.9.3-p448/gems/curl-multi-0.2/lib/curl-multi.rb:292: error: ‘struct RArray’ has no member named ‘len’
/Users/bmalets/.rvm/gems/ruby-1.9.3-p448/gems/curl-multi-0.2/lib/curl-multi.rb:293: error: ‘struct RArray’ has no member named ‘ptr’
/Users/bmalets/.rvm/gems/ruby-1.9.3-p448/gems/curl-multi-0.2/lib/curl-multi.rb:302: warning: implicit conversion shortens 64-bit value into a 32-bit value

我该如何解决？

【问题讨论】：

标签： ruby curl httpclient libcurl curl-multi

【解决方案1】：

tl;dr：curl-multi RubyGem 现在非常陈旧且无人维护：v0.2（最新版本）已于 2008 年 6 月 3 日发布。它与 Ruby 1.9 不兼容。

您绝对应该考虑以下替代方案：

两者都支持libcurl's multi interface。

这里的问题是您使用的是 Ruby 1.9，而 curl-multi 是为 Ruby 1.8 设计的。

与此同时，Ruby C API 发生了变化，例如错误 'struct RString' has no member named 'len' 来自于在 Ruby 1.8 中您拥有的事实（参见 ruby.h）：

struct RString {
    struct RBasic basic;
    long len;
    char *ptr;
    union {
        long capa;
        VALUE shared;
    } aux;
};

在 Ruby 1.9 中，您有：

struct RString {
    struct RBasic basic;
    union {
        struct {
            long len;
            char *ptr;
            union {
                long capa;
                VALUE shared;
            } aux;
        } heap;
        char ary[RSTRING_EMBED_LEN_MAX + 1];
    } as;
};

换句话说，与不再分配堆的short strings相比，事情已经得到优化。

【讨论】：