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res_statsd: Add functions that support variable arguments

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Often, the metric names of statistics we are generating for StatsD have some
dynamic component to them. This can be the name of a particular resource, or
some internal status label in Asterisk. With the current set of functions,
callers of the statsd API must first build the metric name themselves, then
pass this to the API functions. This results in a large amount of boilerplate
code and usage of either fixed length static buffers or dynamic memory
allocation, neither of which is desireable.

This patch adds two new functions to the StatsD API that support a printf
style format specifier for constructing the metric name. A dynamic string,
allocated in threadstorage, is used to build the metric name. This eases
the burden on users of the StatsD API.

Change-Id: If533c72d1afa26d807508ea48b4d8c7b32f414ea
This commit is contained in:
Matt Jordan
2015-11-18 10:05:07 -06:00
parent 1e0040b88f
commit 3354b325c6
2 changed files with 94 additions and 2 deletions
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48
res/res_statsd.c
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@@ -160,6 +160,54 @@ void AST_OPTIONAL_API_NAME(ast_statsd_log_full)(const char *metric_name,
}
AST_THREADSTORAGE(statsd_buf);
void AST_OPTIONAL_API_NAME(ast_statsd_log_string_va)(const char *metric_name,
const char *metric_type, const char *value, double sample_rate, ...)
{
struct ast_str *buf;
va_list ap;
int res;
buf = ast_str_thread_get(&statsd_buf, 128);
if (!buf) {
return;
}
va_start(ap, sample_rate);
res = ast_str_set_va(&buf, 0, metric_name, ap);
va_end(ap);
if (res == AST_DYNSTR_BUILD_FAILED) {
return;
}
ast_statsd_log_string(ast_str_buffer(buf), metric_type, value, sample_rate);
}
void AST_OPTIONAL_API_NAME(ast_statsd_log_full_va)(const char *metric_name,
const char *metric_type, intmax_t value, double sample_rate, ...)
{
struct ast_str *buf;
va_list ap;
int res;
buf = ast_str_thread_get(&statsd_buf, 128);
if (!buf) {
return;
}
va_start(ap, sample_rate);
res = ast_str_set_va(&buf, 0, metric_name, ap);
va_end(ap);
if (res == AST_DYNSTR_BUILD_FAILED) {
return;
}
ast_statsd_log_full(ast_str_buffer(buf), metric_type, value, sample_rate);
}
void AST_OPTIONAL_API_NAME(ast_statsd_log)(const char *metric_name,
const char *metric_type, intmax_t value)
{