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29928b8 60741b5 ad7a961 ec78bd2 ad7a961 ec78bd2 ad7a961 ec78bd2 ad7a961 ec78bd2 ad7a961 ec78bd2 ad7a961 ec78bd2 ad7a961 60741b5 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 | """Tests for CompressionCache with LRU eviction."""
from __future__ import annotations
import pytest
from headroom.cache.compression_cache import CompressionCache
@pytest.fixture
def cache() -> CompressionCache:
return CompressionCache()
@pytest.fixture
def small_cache() -> CompressionCache:
return CompressionCache(max_entries=3)
class TestCompressionCache:
def test_cache_miss_returns_none(self, cache: CompressionCache) -> None:
h = CompressionCache.content_hash("some content")
assert cache.get_compressed(h) is None
def test_store_and_retrieve(self, cache: CompressionCache) -> None:
content = "hello world this is a long message"
h = CompressionCache.content_hash(content)
cache.store_compressed(h, "hello world...compressed", tokens_saved=15)
assert cache.get_compressed(h) == "hello world...compressed"
def test_different_content_different_hash(self) -> None:
h1 = CompressionCache.content_hash("content A")
h2 = CompressionCache.content_hash("content B")
assert h1 != h2
def test_overwrite_same_hash(self, cache: CompressionCache) -> None:
h = CompressionCache.content_hash("some content")
cache.store_compressed(h, "v1", tokens_saved=10)
cache.store_compressed(h, "v2", tokens_saved=20)
assert cache.get_compressed(h) == "v2"
def test_stats_tracking(self, cache: CompressionCache) -> None:
h = CompressionCache.content_hash("content")
cache.store_compressed(h, "compressed", tokens_saved=5)
# One hit
cache.get_compressed(h)
# One miss
cache.get_compressed("nonexistent")
stats = cache.get_stats()
assert stats["hits"] == 1
assert stats["misses"] == 1
assert stats["entries"] == 1
assert stats["tokens_saved"] == 5
def test_eviction_at_max_entries(self, small_cache: CompressionCache) -> None:
h1 = CompressionCache.content_hash("a")
h2 = CompressionCache.content_hash("b")
h3 = CompressionCache.content_hash("c")
h4 = CompressionCache.content_hash("d")
small_cache.store_compressed(h1, "ca", tokens_saved=1)
small_cache.store_compressed(h2, "cb", tokens_saved=1)
small_cache.store_compressed(h3, "cc", tokens_saved=1)
# Adding a 4th should evict the oldest (h1)
small_cache.store_compressed(h4, "cd", tokens_saved=1)
assert small_cache.get_compressed(h1) is None
assert small_cache.get_compressed(h2) == "cb"
assert small_cache.get_compressed(h4) == "cd"
def test_access_refreshes_lru(self, small_cache: CompressionCache) -> None:
h1 = CompressionCache.content_hash("a")
h2 = CompressionCache.content_hash("b")
h3 = CompressionCache.content_hash("c")
h4 = CompressionCache.content_hash("d")
small_cache.store_compressed(h1, "ca", tokens_saved=1)
small_cache.store_compressed(h2, "cb", tokens_saved=1)
small_cache.store_compressed(h3, "cc", tokens_saved=1)
# Access h1 to refresh it
small_cache.get_compressed(h1)
# Adding h4 should evict h2 (oldest untouched), not h1
small_cache.store_compressed(h4, "cd", tokens_saved=1)
assert small_cache.get_compressed(h1) == "ca"
assert small_cache.get_compressed(h2) is None
assert small_cache.get_compressed(h4) == "cd"
def test_content_hash_list_content(self) -> None:
"""content_hash handles Anthropic-format list content."""
list_content = [
{"type": "text", "text": "hello"},
{"type": "text", "text": "world"},
]
h = CompressionCache.content_hash(list_content)
assert isinstance(h, str)
assert len(h) == 16
# Same content produces same hash
assert CompressionCache.content_hash(list_content) == h
def test_content_hash_string_length(self) -> None:
h = CompressionCache.content_hash("test")
assert len(h) == 16
class TestCompressionCacheFrozenCount:
def test_empty_cache_returns_zero(self, cache: CompressionCache) -> None:
assert cache.compute_frozen_count([]) == 0
def test_user_assistant_always_stable(self, cache: CompressionCache) -> None:
messages = [
{"role": "user", "content": "hello"},
{"role": "assistant", "content": "hi there"},
{"role": "user", "content": "how are you"},
]
assert cache.compute_frozen_count(messages) == 3
def test_tool_result_with_cache_hit_is_stable(self, cache: CompressionCache) -> None:
tool_content = "tool output data"
h = CompressionCache.content_hash(tool_content)
cache.store_compressed(h, "compressed tool output", tokens_saved=5)
messages = [
{"role": "user", "content": "do something"},
{
"role": "assistant",
"content": [{"type": "tool_use", "id": "t1", "name": "my_tool", "input": {}}],
},
{
"role": "user",
"content": [{"type": "tool_result", "tool_use_id": "t1", "content": tool_content}],
},
]
assert cache.compute_frozen_count(messages) == 3
def test_tool_result_cache_miss_stops_frozen(self, cache: CompressionCache) -> None:
messages = [
{"role": "user", "content": "hello"},
{
"role": "user",
"content": [
{"type": "tool_result", "tool_use_id": "t1", "content": "uncached stuff"}
],
},
{"role": "user", "content": "follow up"},
]
assert cache.compute_frozen_count(messages) == 1
def test_frozen_count_with_dropped_messages(self, cache: CompressionCache) -> None:
cached_content = "cached tool output"
h = CompressionCache.content_hash(cached_content)
cache.store_compressed(h, "compressed", tokens_saved=3)
messages = [
{"role": "user", "content": "start"},
{
"role": "user",
"content": [
{"type": "tool_result", "tool_use_id": "t1", "content": cached_content}
],
},
{
"role": "user",
"content": [{"type": "tool_result", "tool_use_id": "t2", "content": "not cached"}],
},
]
assert cache.compute_frozen_count(messages) == 2
def test_stable_hash_allows_frozen_count_past_uncached_tool_result(
self, cache: CompressionCache
) -> None:
"""Tool_results marked stable should not stop the frozen count walk."""
tool_content = "excluded Read output — big file contents"
h = CompressionCache.content_hash(tool_content)
cache.mark_stable(h)
messages = [
{"role": "user", "content": "hello"},
{
"role": "user",
"content": [{"type": "tool_result", "tool_use_id": "t1", "content": tool_content}],
},
{"role": "user", "content": "follow up"},
]
# Without mark_stable, this would stop at msg[1] → frozen=1.
# With stable hash, the walk continues past msg[1] → frozen=3.
assert cache.compute_frozen_count(messages) == 3
def test_update_from_result_identical_content_marks_stable(
self, cache: CompressionCache
) -> None:
"""When orig == compressed, update_from_result marks the hash as stable."""
tool_content = "unchanged tool output"
originals = [
{"role": "user", "content": "hi"},
{
"role": "user",
"content": [{"type": "tool_result", "tool_use_id": "t1", "content": tool_content}],
},
]
# Compressed is identical to originals (no compression happened)
compressed = [
{"role": "user", "content": "hi"},
{
"role": "user",
"content": [{"type": "tool_result", "tool_use_id": "t1", "content": tool_content}],
},
]
cache.update_from_result(originals, compressed)
h = CompressionCache.content_hash(tool_content)
assert h in cache._stable_hashes
# Frozen count should now walk past this tool_result
messages = [
{"role": "user", "content": "hello"},
{
"role": "user",
"content": [{"type": "tool_result", "tool_use_id": "t1", "content": tool_content}],
},
{"role": "user", "content": "more stuff"},
]
assert cache.compute_frozen_count(messages) == 3
def test_mark_stable_from_messages(self, cache: CompressionCache) -> None:
"""mark_stable_from_messages records hashes for tool_results."""
content_a = "tool output A"
content_b = "tool output B"
messages = [
{"role": "user", "content": "hi"},
{
"role": "user",
"content": [{"type": "tool_result", "tool_use_id": "t1", "content": content_a}],
},
{
"role": "user",
"content": [{"type": "tool_result", "tool_use_id": "t2", "content": content_b}],
},
]
# Mark first 2 messages (msg[0] + msg[1])
cache.mark_stable_from_messages(messages, 2)
ha = CompressionCache.content_hash(content_a)
hb = CompressionCache.content_hash(content_b)
assert ha in cache._stable_hashes
assert hb not in cache._stable_hashes # msg[2] not included
def test_should_defer_compression_new_content(self, cache: CompressionCache) -> None:
"""First-time content should be deferred."""
h = CompressionCache.content_hash("brand new content")
assert cache.should_defer_compression(h, ttl_seconds=300, batch_window=30) is True
def test_should_defer_compression_near_ttl(self, cache: CompressionCache) -> None:
"""Content near TTL boundary should NOT be deferred."""
import time
h = CompressionCache.content_hash("old content")
# Backdate first_seen to simulate age near TTL
cache._first_seen[h] = time.time() - 280 # 280s old, TTL=300, window=30
assert cache.should_defer_compression(h, ttl_seconds=300, batch_window=30) is False
class TestCompressionCacheApplyAndUpdate:
def test_apply_cached_swaps_tool_results(self, cache: CompressionCache) -> None:
original_content = "big tool output"
h = CompressionCache.content_hash(original_content)
cache.store_compressed(h, "small output", tokens_saved=5)
messages = [
{"role": "user", "content": "hi"},
{
"role": "user",
"content": [
{"type": "tool_result", "tool_use_id": "t1", "content": original_content}
],
},
]
result = cache.apply_cached(messages)
assert result[1]["content"][0]["content"] == "small output"
def test_apply_cached_preserves_uncached_messages(self, cache: CompressionCache) -> None:
messages = [
{"role": "user", "content": "hello"},
{"role": "assistant", "content": "world"},
]
result = cache.apply_cached(messages)
assert result[0] is messages[0]
assert result[1] is messages[1]
def test_apply_cached_never_adds_messages(self, cache: CompressionCache) -> None:
# Store something in cache that doesn't correspond to any message
cache.store_compressed("orphan_hash", "orphan_value", tokens_saved=1)
messages = [
{"role": "user", "content": "hello"},
{"role": "assistant", "content": "hi"},
]
result = cache.apply_cached(messages)
assert len(result) == len(messages)
def test_update_from_result_caches_changes(self, cache: CompressionCache) -> None:
originals = [
{
"role": "user",
"content": [
{"type": "tool_result", "tool_use_id": "t1", "content": "original output"}
],
},
]
compressed = [
{
"role": "user",
"content": [
{"type": "tool_result", "tool_use_id": "t1", "content": "compressed output"}
],
},
]
cache.update_from_result(originals, compressed)
h = CompressionCache.content_hash("original output")
assert cache.get_compressed(h) == "compressed output"
def test_update_from_result_ignores_unchanged(self, cache: CompressionCache) -> None:
originals = [
{
"role": "user",
"content": [
{"type": "tool_result", "tool_use_id": "t1", "content": "same content"}
],
},
]
compressed = [
{
"role": "user",
"content": [
{"type": "tool_result", "tool_use_id": "t1", "content": "same content"}
],
},
]
cache.update_from_result(originals, compressed)
h = CompressionCache.content_hash("same content")
assert cache.get_compressed(h) is None
def test_apply_does_not_modify_original_messages(self, cache: CompressionCache) -> None:
original_content = "big tool output"
h = CompressionCache.content_hash(original_content)
cache.store_compressed(h, "small output", tokens_saved=5)
msg = {
"role": "user",
"content": [{"type": "tool_result", "tool_use_id": "t1", "content": original_content}],
}
messages = [msg]
cache.apply_cached(messages)
# Original must be untouched
assert msg["content"][0]["content"] == original_content
def test_openai_format_tool_result(self, cache: CompressionCache) -> None:
original_content = "openai tool output"
h = CompressionCache.content_hash(original_content)
cache.store_compressed(h, "compressed openai", tokens_saved=4)
messages = [
{"role": "tool", "tool_call_id": "tc1", "content": original_content},
]
result = cache.apply_cached(messages)
assert result[0]["content"] == "compressed openai"
# Original untouched
assert messages[0]["content"] == original_content
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