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cpp-libs
Actor Framework
Commits
6b1bd132
Commit
6b1bd132
authored
Jun 11, 2020
by
Dominik Charousset
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Add timestamps to Prometheus output
parent
00ee8640
Changes
3
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3 changed files
with
54 additions
and
15 deletions
+54
-15
libcaf_core/caf/telemetry/collector/prometheus.hpp
libcaf_core/caf/telemetry/collector/prometheus.hpp
+31
-4
libcaf_core/src/telemetry/collector/prometheus.cpp
libcaf_core/src/telemetry/collector/prometheus.cpp
+18
-6
libcaf_core/test/telemetry/collector/prometheus.cpp
libcaf_core/test/telemetry/collector/prometheus.cpp
+5
-5
No files found.
libcaf_core/caf/telemetry/collector/prometheus.hpp
View file @
6b1bd132
...
...
@@ -18,6 +18,7 @@
#pragma once
#include <ctime>
#include <unordered_map>
#include <vector>
...
...
@@ -30,19 +31,39 @@ namespace caf::telemetry::collector {
/// format. For a documentation of the format, see: https://git.io/fjgDD.
class
prometheus
{
public:
// -- member types -----------------------------------------------------------
/// A buffer for storing UTF-8 characters. Using a vector instead of a
/// `std::string` has slight performance benefits, since the vector does not
/// have to maintain a null-terminator.
using
char_buffer
=
std
::
vector
<
char
>
;
/// Initializes state before passing this collector to a metric registry.
void
begin_collecting
();
// -- properties -------------------------------------------------------------
/// Returns the minimum scrape interval, i.e., the minimum time that needs to
/// pass before `collect_from` iterates the registry to re-fill the buffer.
time_t
min_scrape_interval
()
const
noexcept
{
return
min_scrape_interval_
;
}
/// Finalizes state after collecting metrics from a registry completed.
void
end_collecting
();
/// Sets the minimum scrape interval to `value`.
void
min_scrape_interval
(
time_t
value
)
noexcept
{
min_scrape_interval_
=
value
;
}
// -- collect API ------------------------------------------------------------
/// Applies this collector to the registry, filling the character buffer while
/// collecting metrics.
/// @param registry Source for the metrics.
/// @param now Timestamp as time since UNIX epoch in seconds.
/// @returns a view into the filled buffer.
string_view
collect_from
(
const
metric_registry
&
registry
,
time_t
now
);
/// Applies this collector to the registry, filling the character buffer while
/// collecting metrics. Uses the current system time as timestamp.
/// @param registry Source for the metrics.
/// @returns a view into the filled buffer.
string_view
collect_from
(
const
metric_registry
&
registry
);
// -- call operators for the metric registry ---------------------------------
...
...
@@ -59,11 +80,17 @@ private:
/// Stores the generated text output.
char_buffer
buf_
;
/// Current timestamp.
time_t
now_
=
0
;
/// Caches type information and help text for a metric.
std
::
unordered_map
<
const
metric_family
*
,
char_buffer
>
meta_info_
;
/// Caches which metric family is currently collected.
const
metric_family
*
current_family_
=
nullptr
;
/// Minimum time between re-iterating the registry.
time_t
min_scrape_interval_
=
0
;
};
}
// namespace caf::telemetry::collector
libcaf_core/src/telemetry/collector/prometheus.cpp
View file @
6b1bd132
...
...
@@ -19,6 +19,8 @@
#include "caf/telemetry/collector/prometheus.hpp"
#include <cmath>
#include <ctime>
#include <type_traits>
#include "caf/telemetry/int_gauge.hpp"
#include "caf/telemetry/metric.hpp"
...
...
@@ -44,8 +46,9 @@ void append(prometheus::char_buffer&, char, Ts&&...);
template
<
class
...
Ts
>
void
append
(
prometheus
::
char_buffer
&
,
double
,
Ts
&&
...);
template
<
class
...
Ts
>
void
append
(
prometheus
::
char_buffer
&
,
int64_t
,
Ts
&&
...);
template
<
class
T
,
class
...
Ts
>
std
::
enable_if_t
<
std
::
is_integral
<
T
>::
value
>
append
(
prometheus
::
char_buffer
&
buf
,
T
val
,
Ts
&&
...
xs
);
template
<
class
...
Ts
>
void
append
(
prometheus
::
char_buffer
&
,
const
metric_family
*
,
Ts
&&
...);
...
...
@@ -80,8 +83,9 @@ void append(prometheus::char_buffer& buf, double val, Ts&&... xs) {
append
(
buf
,
std
::
forward
<
Ts
>
(
xs
)...);
}
template
<
class
...
Ts
>
void
append
(
prometheus
::
char_buffer
&
buf
,
int64_t
val
,
Ts
&&
...
xs
)
{
template
<
class
T
,
class
...
Ts
>
std
::
enable_if_t
<
std
::
is_integral
<
T
>::
value
>
append
(
prometheus
::
char_buffer
&
buf
,
T
val
,
Ts
&&
...
xs
)
{
append
(
buf
,
std
::
to_string
(
val
));
append
(
buf
,
std
::
forward
<
Ts
>
(
xs
)...);
}
...
...
@@ -113,17 +117,25 @@ void append(prometheus::char_buffer& buf, const metric* instance, Ts&&... xs) {
}
// namespace
string_view
prometheus
::
collect_from
(
const
metric_registry
&
registry
)
{
string_view
prometheus
::
collect_from
(
const
metric_registry
&
registry
,
time_t
now
)
{
if
(
!
buf_
.
empty
()
&&
now
-
now_
<
min_scrape_interval_
)
return
{
buf_
.
data
(),
buf_
.
size
()};
buf_
.
clear
();
now_
=
now
;
registry
.
collect
(
*
this
);
current_family_
=
nullptr
;
return
{
buf_
.
data
(),
buf_
.
size
()};
}
string_view
prometheus
::
collect_from
(
const
metric_registry
&
registry
)
{
return
collect_from
(
registry
,
time
(
NULL
));
}
void
prometheus
::
operator
()(
const
metric_family
*
family
,
const
metric
*
instance
,
const
int_gauge
*
gauge
)
{
set_current_family
(
family
,
"gauge"
);
append
(
buf_
,
family
,
instance
,
' '
,
gauge
->
value
(),
'\n'
);
append
(
buf_
,
family
,
instance
,
' '
,
gauge
->
value
(),
'
'
,
now_
,
'
\n'
);
}
void
prometheus
::
set_current_family
(
const
metric_family
*
family
,
...
...
libcaf_core/test/telemetry/collector/prometheus.cpp
View file @
6b1bd132
...
...
@@ -51,16 +51,16 @@ CAF_TEST(the Prometheus collector generates text output) {
registry
.
int_gauge
(
"some"
,
"value"
,
{{
"a"
,
"1"
},
{
"b"
,
"2"
}})
->
value
(
12
);
registry
.
int_gauge
(
"some"
,
"value"
,
{{
"b"
,
"1"
},
{
"a"
,
"2"
}})
->
value
(
21
);
registry
.
int_gauge
(
"other"
,
"value"
,
{{
"x"
,
"true"
}})
->
value
(
31337
);
CAF_CHECK_EQUAL
(
exporter
.
collect_from
(
registry
),
CAF_CHECK_EQUAL
(
exporter
.
collect_from
(
registry
,
42
),
R"(# HELP foo_bar_seconds Just some value without labels.
# TYPE foo_bar_seconds gauge
foo_bar_seconds 123
foo_bar_seconds 123
42
# HELP some_value_total Just some (total) value with two labels.
# TYPE some_value_total gauge
some_value_total{a="1",b="2"} 12
some_value_total{a="2",b="1"} 21
some_value_total{a="1",b="2"} 12
42
some_value_total{a="2",b="1"} 21
42
# TYPE other_value_seconds_total gauge
other_value_seconds_total{x="true"} 31337
other_value_seconds_total{x="true"} 31337
42
)"
_sv
);
CAF_MESSAGE
(
"multiple runs generate the same output"
);
std
::
string
res1
;
...
...
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