mirror of
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111 lines
3.9 KiB
Python
111 lines
3.9 KiB
Python
"""Tests for reading zram metrics from injectable proc and sys paths."""
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import importlib
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import importlib.util
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import sys
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import tempfile
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import unittest
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from pathlib import Path
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SCRIPTS_DIR = Path(__file__).resolve().parents[1]
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if str(SCRIPTS_DIR) not in sys.path:
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sys.path.insert(0, str(SCRIPTS_DIR))
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class ZramMetricsTests(unittest.TestCase):
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def test_reader_module_is_available(self):
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module_spec = importlib.util.find_spec("zram_metrics")
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self.assertIsNotNone(module_spec)
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module = importlib.import_module("zram_metrics")
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self.assertTrue(callable(getattr(module, "read_zram_metrics", None)))
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def setUp(self):
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self.temporary = tempfile.TemporaryDirectory()
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self.addCleanup(self.temporary.cleanup)
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self.root = Path(self.temporary.name)
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self.block_root = self.root / "sys" / "block"
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self.block_root.mkdir(parents=True)
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self.swaps_path = self.root / "proc" / "swaps"
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self.swaps_path.parent.mkdir(parents=True)
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self.swaps_path.write_text(
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"Filename\tType\tSize\tUsed\tPriority\n", encoding="utf-8"
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)
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def add_device(self, name="zram0", mm_stat="2097152 1048576 1179648 0"):
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device = self.block_root / name
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device.mkdir()
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(device / "disksize").write_text("1073741824\n", encoding="utf-8")
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(device / "mm_stat").write_text(mm_stat + "\n", encoding="utf-8")
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(device / "comp_algorithm").write_text(
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"lzo lzo-rle [zstd] lz4\n", encoding="utf-8"
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)
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return device
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def read_metrics(self):
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from zram_metrics import read_zram_metrics
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return read_zram_metrics(self.block_root, self.swaps_path)
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def test_no_zram_devices_reports_unavailable(self):
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(self.block_root / "sda").mkdir()
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self.assertEqual(self.read_metrics(), {"available": False, "devices": []})
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def test_reads_capacity_swap_usage_and_compression_counters(self):
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self.add_device()
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self.swaps_path.write_text(
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"Filename\tType\tSize\tUsed\tPriority\n"
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"/dev/zram0\tpartition\t1048576\t1024\t100\n",
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encoding="utf-8",
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)
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self.assertEqual(
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self.read_metrics(),
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{
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"available": True,
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"devices": [
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{
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"name": "zram0",
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"active": True,
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"capacity_bytes": 1073741824,
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"swap_used_bytes": 1048576,
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"original_bytes": 2097152,
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"compressed_bytes": 1048576,
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"memory_used_bytes": 1179648,
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"algorithm": "zstd",
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"compression_ratio": 2.0,
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"saved_bytes": 917504,
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}
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],
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},
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)
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def test_zero_compressed_bytes_has_null_ratio(self):
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self.add_device(mm_stat="2097152 0 0 0")
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result = self.read_metrics()
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self.assertTrue(result["available"])
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self.assertEqual(len(result["devices"]), 1)
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self.assertFalse(result["devices"][0]["active"])
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self.assertEqual(result["devices"][0]["swap_used_bytes"], 0)
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self.assertIsNone(result["devices"][0]["compression_ratio"])
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def test_malformed_or_short_mm_stat_omits_device(self):
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for mm_stat in ("not-a-number 1048576 1179648", "2097152 1048576"):
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with self.subTest(mm_stat=mm_stat):
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device = self.block_root / "zram0"
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if device.exists():
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(device / "mm_stat").write_text(mm_stat + "\n", encoding="utf-8")
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else:
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self.add_device(mm_stat=mm_stat)
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result = self.read_metrics()
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self.assertFalse(result["available"])
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self.assertEqual(result["devices"], [])
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if __name__ == "__main__":
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unittest.main()
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