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Create app.py
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app.py
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import sys
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import unittest
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import pytest
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import streamlit.metrics
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from mock import call, patch
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from streamlit import config
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class MetricsTest(unittest.TestCase):
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"""Metrics Unittest class."""
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def setUp(self):
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"""Make sure Client singleton is always empty before starting tests."""
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streamlit.metrics.Client._singleton = None
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def tearDown(self):
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"""Cleanup metrics client."""
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config.set_option("global.metrics", False)
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streamlit.metrics.Client._singleton = None
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client = streamlit.metrics.Client.get_current()
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client.toggle_metrics()
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def test_constructor(self):
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"""Test streamlit.metrics.Client."""
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client = streamlit.metrics.Client()
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self.assertEqual(streamlit.metrics.Client._singleton, client)
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def test_get_current(self):
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"""Test streamlit.metrics.clientget_current."""
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client = streamlit.metrics.Client.get_current()
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self.assertEqual(streamlit.metrics.Client._singleton, client)
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def test_not_singleton(self):
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"""Test streamlit.metrics.Client not singleton."""
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client = streamlit.metrics.Client.get_current()
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with pytest.raises(RuntimeError) as e:
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streamlit.metrics.Client()
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msg = "Client already initialized. Use .get_current() instead"
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self.assertEqual(msg, str(e.value))
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def test_enabled_metrics_no_prometheus(self):
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"""Test streamlit.metrics.Client.toggle_metrics no prometheus."""
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config.set_option("global.metrics", True)
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client = streamlit.metrics.Client.get_current()
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if sys.version_info <= (3, 0):
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builtin_import = "__builtin__.__import__"
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else:
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builtin_import = "builtins.__import__"
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with pytest.raises(ImportError) as e:
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with patch(builtin_import, side_effect=ImportError):
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client.toggle_metrics()
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msg = "prometheus-client is not installed. pip install prometheus-client"
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self.assertEqual(msg, str(e.value))
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def test_enabled_metrics(self):
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"""Test streamlit.metrics.toggle_metrics enabled."""
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config.set_option("global.metrics", True)
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client = streamlit.metrics.Client.get_current()
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client._metrics = {}
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# yapf: disable
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client._raw_metrics = [
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('Counter', 'unittest_counter', 'Unittest counter', []),
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('Counter', 'unittest_counter_labels', 'Unittest counter labels', ['label']),
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('Gauge', 'unittest_gauge', 'Unittest gauge', []),
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]
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# yapf: enable
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client.toggle_metrics()
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client.get("unittest_counter").inc()
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client.get("unittest_counter_labels").labels("some_label")
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client.get("unittest_gauge").set(42)
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truth = [
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"unittest_counter_total 1.0",
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'unittest_counter_labels_total{label="some_label"} 0.0',
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"unittest_gauge 42.0",
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]
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lines = client.generate_latest().splitlines()
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metrics = [
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x.decode("utf-8") for x in lines if x.decode("utf-8").startswith("unit")
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]
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metrics = [str(x) for x in metrics if "_created" not in x]
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self.assertEqual(sorted(truth), sorted(metrics))
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def test_disabled_metrics_check_value(self):
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"""Test streamlit.metrics.Client.toggle_metrics disabled check value."""
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with patch("streamlit.metrics.MockMetric", spec=True) as mock_metric:
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config.set_option("global.metrics", False)
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client = streamlit.metrics.Client.get_current()
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client._metrics = {}
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# yapf: disable
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client._raw_metrics = [
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('Counter', 'unittest_counter', 'Unittest counter', []),
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('Counter', 'unittest_counter_labels', 'Unittest counter labels', ['label']),
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('Gauge', 'unittest_gauge', 'Unittest gauge', []),
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]
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# yapf: enable
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client.toggle_metrics()
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# Test that handler in Server.py will return nothing.
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self.assertEqual(client.generate_latest(), "")
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client.get("unittest_counter").inc()
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client.get("unittest_counter_labels").labels("some_label")
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client.get("unittest_gauge").set(42)
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client.get("unittest_gauge").dec()
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calls = [
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call(), # Constructor
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call(), # unittest_counter
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call(), # unittest_counter_labels
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call(), # unittest_gauge
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call().inc(),
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call().labels("some_label"),
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call().set(42),
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call().dec(),
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]
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self.assertEqual(calls, mock_metric.mock_calls)
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def test_disabled_metrics(self):
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"""Test streamlit.metrics.Client.toggle_metrics disabled."""
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config.set_option("global.metrics", False)
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client = streamlit.metrics.Client.get_current()
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client._metrics = {}
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# yapf: disable
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client._raw_metrics = [
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('Counter', 'unittest_counter', 'Unittest counter', []),
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('Counter', 'unittest_counter_labels', 'Unittest counter labels', ['label']),
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('Gauge', 'unittest_gauge', 'Unittest gauge', []),
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]
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# yapf: enable
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client.toggle_metrics()
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client.get("unittest_counter").inc()
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client.get("unittest_counter_labels").labels("some_label")
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client.get("unittest_gauge").set(42)
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client.get("unittest_gauge").dec()
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