pytest_userver.metrics.MetricsSnapshot Class Reference

Detailed Description

Snapshot of captured metrics that mimics the dict interface.

Metrics have the 'Dict[str(path), Set[Metric]]' format.

async def test_engine_metrics(service_client, monitor_client):
    metric = await monitor_client.single_metric(
        'engine.task-processors.tasks.finished',
        labels={'task_processor': 'main-task-processor'},
    )
    assert metric.value > 0
    assert metric.labels == {'task_processor': 'main-task-processor'}
 
    metrics_dict = await monitor_client.metrics(
        prefix='http.', labels={'http_path': '/ping'},
    )
 
    assert metrics_dict
    assert 'http.handler.cancelled-by-deadline' in metrics_dict
 
    assert (
        metrics_dict.value_at(
            'http.handler.in-flight',
            labels={
                'http_path': '/ping',
                'http_handler': 'handler-ping',
                'version': '2',
            },
        )
        == 0
    )

Definition at line 132 of file metrics.py.

Public Member Functions
	__init__ (self, typing.Mapping[str, typing.Set[Metric]] values)
typing.Set[Metric]	__getitem__ (self, str path)
	Returns a list of metrics by specified path.
int	__len__ (self)
	Returns count of metrics paths.
	__iter__ (self)
	Returns a (path, list) iterable over the metrics.
bool	__contains__ (self, str path)
	Returns True if metric with specified path is in the snapshot, False otherwise.
bool	__eq__ (self, object other)
	Compares the snapshot with a dict of metrics or with another snapshot.
str	__repr__ (self)
str	__str__ (self)
	get (self, str path, default=None)
	Returns an list of metrics by path or default if there's no such path.
	items (self)
	Returns a (path, list) iterable over the metrics.
	keys (self)
	Returns an iterable over paths of metrics.
	values (self)
	Returns an iterable over lists of metrics.
MetricValue	value_at (self, str path, typing.Optional[typing.Dict] labels=None, *typing.Optional[MetricValue] default=None)
	Returns a single metric value at specified path.
typing.List[Metric]	metrics_at (self, str path, typing.Optional[typing.Dict] require_labels=None)
	Metrics path must exactly equal the given path.
bool	has_metrics_at (self, str path, typing.Optional[typing.Dict] require_labels=None)
None	assert_equals (self, typing.Mapping[str, typing.Set[Metric]] other, *bool ignore_zeros=False)
	Compares the snapshot with a dict of metrics or with another snapshot, displaying a nice diff on mismatch.
str	pretty_print (self)
	Multiline linear print: path: (label=value),(label=value) TYPE VALUE path: (label=value),(label=value) TYPE VALUE Usage:
str	to_json (self)
	Serialize to a JSON string.

Static Public Member Functions
'MetricsSnapshot'	from_json (str json_str)
	Construct MetricsSnapshot from a JSON string.

Protected Attributes
	_values

Constructor & Destructor Documentation

__init__()

pytest_userver.metrics.MetricsSnapshot.__init__	(		self,
		typing.Mapping[str, typing.Set[Metric]]	values )

Definition at line 142 of file metrics.py.

Member Function Documentation

__contains__()

bool pytest_userver.metrics.MetricsSnapshot.__contains__	(		self,
		str	path )

Returns True if metric with specified path is in the snapshot, False otherwise.

Definition at line 157 of file metrics.py.

__eq__()

bool pytest_userver.metrics.MetricsSnapshot.__eq__	(		self,
		object	other )

Compares the snapshot with a dict of metrics or with another snapshot.

Definition at line 164 of file metrics.py.

__getitem__()

typing.Set[Metric] pytest_userver.metrics.MetricsSnapshot.__getitem__	(		self,
		str	path )

Returns a list of metrics by specified path.

Definition at line 145 of file metrics.py.

__iter__()

pytest_userver.metrics.MetricsSnapshot.__iter__

(

self

)

Returns a (path, list) iterable over the metrics.

Definition at line 153 of file metrics.py.

__len__()

int pytest_userver.metrics.MetricsSnapshot.__len__

(

self

)

Returns count of metrics paths.

Definition at line 149 of file metrics.py.

__repr__()

str pytest_userver.metrics.MetricsSnapshot.__repr__

(

self

)

Definition at line 171 of file metrics.py.

__str__()

str pytest_userver.metrics.MetricsSnapshot.__str__

(

self

)

Definition at line 174 of file metrics.py.

assert_equals()

None pytest_userver.metrics.MetricsSnapshot.assert_equals	(		self,
		typing.Mapping[str, typing.Set[Metric]]	other,
		*bool	ignore_zeros = False )

Compares the snapshot with a dict of metrics or with another snapshot, displaying a nice diff on mismatch.

Definition at line 282 of file metrics.py.

from_json()

'MetricsSnapshot' pytest_userver.metrics.MetricsSnapshot.from_json ( str json_str )

static

Construct MetricsSnapshot from a JSON string.

Definition at line 337 of file metrics.py.

get()

pytest_userver.metrics.MetricsSnapshot.get	(		self,
		str	path,
			default = None )

Returns an list of metrics by path or default if there's no such path.

Definition at line 177 of file metrics.py.

has_metrics_at()

bool pytest_userver.metrics.MetricsSnapshot.has_metrics_at	(		self,
		str	path,
		typing.Optional[typing.Dict]	require_labels = None )

Definition at line 275 of file metrics.py.

items()

pytest_userver.metrics.MetricsSnapshot.items

(

self

)

Returns a (path, list) iterable over the metrics.

Definition at line 184 of file metrics.py.

keys()

pytest_userver.metrics.MetricsSnapshot.keys

(

self

)

Returns an iterable over paths of metrics.

Definition at line 188 of file metrics.py.

metrics_at()

typing.List[Metric] pytest_userver.metrics.MetricsSnapshot.metrics_at	(		self,
		str	path,
		typing.Optional[typing.Dict]	require_labels = None )

Metrics path must exactly equal the given path.

A required subset of labels is specified by require_labels Example: require_labels={'a':'b', 'c':'d'} { 'a':'b', 'c':'d'} - exact match { 'a':'b', 'c':'d', 'e': 'f', 'h':'k'} - match { 'a':'x', 'c':'d'} - no match, incorrect value for label 'a' { 'a' : 'b'} - required label not found Usage:

for m in metrics_with_labels(path='something.something.sensor',
  require_labels={ 'label1': 'value1' }):
   assert m.value > 0

Definition at line 235 of file metrics.py.

pretty_print()

str pytest_userver.metrics.MetricsSnapshot.pretty_print

(

self

)

Multiline linear print: path: (label=value),(label=value) TYPE VALUE path: (label=value),(label=value) TYPE VALUE Usage:

assert 'some.thing.sensor' in metric, metric.pretty_print()

Definition at line 296 of file metrics.py.

to_json()

str pytest_userver.metrics.MetricsSnapshot.to_json

(

self

)

Serialize to a JSON string.

Definition at line 354 of file metrics.py.

value_at()

MetricValue pytest_userver.metrics.MetricsSnapshot.value_at	(		self,
		str	path,
		typing.Optional[typing.Dict]	labels = None,
		*typing.Optional[MetricValue]	default = None )

Returns a single metric value at specified path.

If a dict of labels is provided, does en exact match of labels (i.e. {} stands for no labels; {'a': 'b', 'c': 'd'} matches only {'a': 'b', 'c': 'd'} or {'c': 'd', 'a': 'b'} but neither match {'a': 'b'} nor {'a': 'b', 'c': 'd', 'e': 'f'}).

Exceptions

AssertionError

if not one metric by path

Definition at line 196 of file metrics.py.

values()

pytest_userver.metrics.MetricsSnapshot.values

(

self

)

Returns an iterable over lists of metrics.

Definition at line 192 of file metrics.py.

Member Data Documentation

_values

pytest_userver.metrics.MetricsSnapshot._values

protected

Definition at line 143 of file metrics.py.

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The documentation for this class was generated from the following file:

• /data/code/userver/testsuite/pytest_plugins/pytest_userver/metrics.py