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modules/stats: Iterate items for /stats response. (#31)

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This commit is contained in:
Jason Volk 2020-06-17 20:34:39 -07:00
parent 4b20747e06
commit 3ec1ce6773
1 changed files with 40 additions and 37 deletions
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77
modules/stats.cc
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@ -8,16 +8,22 @@
// copyright notice and this permission notice is present in all copies. The
// full license for this software is available in the LICENSE file.
using namespace ircd;
namespace ircd::stats
{
static resource::response get_stats(client &, const resource::request &);
mapi::header
extern resource::method method_get;
extern resource stats_resource;
}
ircd::mapi::header
IRCD_MODULE
{
"Prometheus Metrics"
};
resource
stats_resource
decltype(ircd::stats::stats_resource)
ircd::stats::stats_resource
{
"/stats",
{
@ -25,51 +31,48 @@ stats_resource
}
};
static resource::response
get__stats(client &,
const resource::request &);
resource::method
stats_get
decltype(ircd::stats::method_get)
ircd::stats::method_get
{
stats_resource, "GET", get__stats
stats_resource, "GET", get_stats
};
resource::response
get__stats(client &client,
const resource::request &request)
ircd::resource::response
ircd::stats::get_stats(client &client,
const resource::request &request)
{
static const size_t buf_max
resource::response::chunked response
{
4096
client, http::OK, "text/plain"
};
char buf[buf_max];
std::stringstream out;
pubsetbuf(out, buf);
const time_t ts
{
ircd::time<milliseconds>()
};
out << "aio_requests_total"
<< ' ' << fs::aio::stats.requests
<< ' ' << ts
<< '\n';
out << "aio_requests_bytes_total"
<< ' ' << fs::aio::stats.bytes_requests
<< ' ' << ts
<< '\n';
const string_view output
for(const auto &[name_, item] : items)
{
view(out, buf)
};
char buf[256], name[2][128], val[64];
const string_view _name
{
replace(name[0], name_, '.', '_')
};
return resource::response
{
client, output, "text/plain", http::OK
};
const string_view line
{
buf,
::snprintf
(
buf, sizeof(buf), "%s %s %lu\n",
data(strlcpy(name[1], _name)),
data(string(val, *item)),
ts
)
};
response.write(line);
}
return std::move(response);
}