尝试使用 curl-multi gem 发出 HTTP 请求时函数'add_to_curl'错误

Question

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starange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

我该怎么修？

Answer 1

tl；dr：curl-multi RubyGem现在非常旧且未维护：v0.2（上一次发布）已于2008年6月3日发布。它与Ruby 1.9不兼容。

你肯定应该考虑其他选择，比如：

• 伤寒
• 路缘

两者都支持libcurl的多接口。

---

这里的问题是，您使用的是Ruby1.9，而curl-multi是为Ruby1.8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Ruby 1.8中的以下事实（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，与不再分配堆的短字符串相比，事情已经得到了优化。