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<title>Describe linux/gwan g-wan key value store here.</title>
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Describe linux/gwan g-wan key value store here.
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<span class="label">Date</span>
<abbr class="published" title="2013-08-07T00:00:00">
<i class="icon-calendar"></i>三 07 八月 2013
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<a href="http://liugehao.github.io/author/liugehao.html"><i class="icon-user"></i>liugehao</a>
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<p>add data: http://localhost:8080/?kv4.c&act=a</p>
<p>get data: http://localhost:8080/?kv4.c&body=999999</p>
<p>首先定义结构 record_t 指针，分配内存空间，存储数据，添加进k/v存储。</p>
<p>{{{#!highlight c</p>
<h1>include "gwan.h" // G-WAN exported functions</h1>
<h1>include <malloc.h></h1>
<h1>include <string.h></h1>
<h1>include <stdlib.h></h1>
<p>typedef struct record_s // this is a user-defined 'record' structure
{
char <em>name; // the Key(name) is a field of the Value(name, email)
char </em>email;
u32 id; <br />
} record_t;</p>
<p>int main(int argc, char <em>argv[])
{
xbuf_t </em>reply = get_reply(argv);
char <em>act="", </em>body="";
get_arg("act=", &act, argc, argv);</p>
<div class="highlight"><pre><span class="nx">get_arg</span><span class="p">(</span><span class="s2">"body="</span><span class="p">,</span> <span class="o">&</span><span class="nb">body</span><span class="p">,</span> <span class="nx">argc</span><span class="p">,</span> <span class="nx">argv</span><span class="p">);</span>
<span class="nx">xbuf_xcat</span><span class="p">(</span><span class="nx">reply</span><span class="p">,</span> <span class="s2">"-- %s --- %s"</span><span class="p">,</span> <span class="nx">act</span><span class="p">,</span> <span class="nb">body</span><span class="p">);</span>
<span class="nx">kv_t</span> <span class="o">**</span><span class="n">vhost_ptr</span> <span class="o">=</span> <span class="p">(</span><span class="nx">kv_t</span><span class="o">**</span><span class="p">)</span><span class="nx">get_env</span><span class="p">(</span><span class="nx">argv</span><span class="p">,</span> <span class="nx">US_VHOST_DATA</span><span class="p">),</span> <span class="c1">//persistent ptr</span>
<span class="o">*</span><span class="n">forum_store</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="c1">//convenience pointer (var->m instead of (*var)->m)</span>
<span class="k">if</span> <span class="p">(</span><span class="nx">vhost_ptr</span> <span class="o">&&</span> <span class="o">!*</span><span class="nx">vhost_ptr</span><span class="p">)</span>
<span class="p">{</span>
<span class="o">*</span><span class="n">vhost_ptr</span> <span class="o">=</span> <span class="p">(</span><span class="nx">kv_t</span><span class="o">*</span><span class="p">)</span><span class="nx">malloc</span><span class="p">(</span><span class="nx">sizeof</span><span class="p">(</span><span class="nx">kv_t</span><span class="p">));</span>
<span class="c1">//threads and posts stored here</span>
<span class="nx">kv_init</span><span class="p">(</span><span class="o">*</span><span class="nx">vhost_ptr</span><span class="p">,</span> <span class="s2">"users"</span><span class="p">,</span> <span class="mi">1024</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">);</span>
<span class="p">}</span>
<span class="n">forum_store</span> <span class="o">=</span> <span class="o">*</span><span class="nx">vhost_ptr</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span> <span class="o">*</span><span class="nx">act</span> <span class="o">==</span> <span class="s1">'a'</span> <span class="p">)</span>
<span class="p">{</span>
<span class="nx">kv_item</span> <span class="nb">item</span><span class="p">;</span>
<span class="nx">record_t</span> <span class="o">*</span><span class="nx">record</span> <span class="p">;</span>
<span class="nx">u32</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span>
<span class="nx">char</span> <span class="nx">str</span><span class="err">[</span><span class="mi">15</span><span class="cp">]</span>;
char email<span class="cp">[</span><span class="mi">15</span><span class="cp">]</span>;
while(i<span class="nt">< 15000000</span><span class="err">)</span>
<span class="err">{</span>
<span class="err">//</span><span class="na">sprintf</span><span class="err">(</span><span class="na">str</span><span class="err">,</span> <span class="err">"%</span><span class="na">d</span><span class="err">",</span> <span class="na">i</span><span class="err">);</span>
<span class="err">//</span><span class="na">sprintf</span><span class="err">(</span><span class="na">email</span><span class="err">,</span> <span class="err">"%</span><span class="na">d</span><span class="err">",</span> <span class="na">i</span> <span class="err">*</span> <span class="na">3</span><span class="err">);</span>
<span class="na">record =</span><span class="err"> </span><span class="s">(record_t*)malloc(sizeof(record_t));</span>
<span class="na">record-</span><span class="nt">></span>name = (char*)strdup(str);
record->email = (char*)strdup(email);
record->id = i;
item.key = (char *)<span class="ni">&record->id;</span>
item.klen = sizeof(u32);//sizeof(str) - 1; // faster
item.val = (char*)record;
item.flags = 0;
kv_add(forum_store, <span class="ni">&item);</span> // add an entry to the name_dat Store index
i++;
}
}
xbuf_xcat(reply, "<span class="nt"><br><b></span>Count<span class="nt"></b></span>: %d key(s) in KV store<span class="nt"><br></span>",
forum_store->nbr_items);
u32 val=atof(body);
//printf("%s, %d\n", body, val);
record_t *record = (record_t*)kv_get(forum_store, (char*)<span class="err">&</span>val, sizeof(u32));
xbuf_xcat(reply,
"<span class="nt"><br></span>record with id = '%u' name's field: \"%s\", email: %s <span class="nt"><br></span>",
val,
record ? record->name : "<span class="nt"><font</span> <span class="na">color=</span><span class="s">#ff4040</span><span class="nt">></span>not found<span class="nt"></font></span>",
record ? record->email : "<span class="nt"><font</span> <span class="na">color=</span><span class="s">#ff4040</span><span class="nt">></span>not found<span class="nt"></font></span>");
//char n<span class="cp">[</span><span class="mi">7</span><span class="cp">]</span> = "100010";
//record_t *p = (record_t *)kv_get(forum_store, body, 6); // 0:not found
// xbuf_xcat(reply, "<span class="nt"><br></span>pierre's email address: %s <span class="nt"><br></span>", p->email);
return 200; // return an HTTP code (200:'OK')
</pre></div>
<p>}</p>
<p>}}}</p>
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