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feat(dl): cache content keys in-memory to skip duplicate license requests

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A title with many tracks sharing the same KID issued one license request per track even when keys were identical. Add an in-memory KID -> key cache shared across all tracks of a single invocation, populated on vault hit and on license success. Subsequent tracks with cached KIDs short-circuit before the vault and license calls, reducing traffic to one request per unique KID.
This commit is contained in:
imSp4rky
2026-05-14 11:58:31 -06:00
parent 60441f05c4
commit 0aca0e8888
1 changed files with 47 additions and 0 deletions
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47
unshackle/commands/dl.py
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@@ -558,6 +558,7 @@ class dl:
DRM_TABLE_LOCK = Lock()
EXPORT_LOCK = Lock()
LICENSE_KEY_CACHE: dict[UUID, str] = {}
def __init__(
self,
@@ -2824,6 +2825,26 @@ class dl:
is_track_kid = ["", "*"][kid == track_kid]
cached_key = self.LICENSE_KEY_CACHE.get(kid)
if cached_key:
drm.content_keys[kid] = cached_key
label = f"[text2]{kid.hex}:{cached_key}{is_track_kid} from cache"
if not any(f"{kid.hex}:{cached_key}" in x.label for x in cek_tree.children):
cek_tree.add(label)
if self.debug_logger:
self.debug_logger.log(
level="INFO",
operation="license_cache_hit",
service=self.service,
context={
"kid": kid.hex,
"content_key": cached_key,
"track": str(track),
"drm_type": "Widevine",
},
)
continue
if not cdm_only:
content_key, vault_used = self.vaults.get_key(kid)
if content_key:
@@ -2832,6 +2853,7 @@ class dl:
if not any(f"{kid.hex}:{content_key}" in x.label for x in cek_tree.children):
cek_tree.add(label)
self.vaults.add_key(kid, content_key, excluding=vault_used)
self.LICENSE_KEY_CACHE[kid] = content_key
if self.debug_logger:
self.debug_logger.log_vault_query(
@@ -2936,6 +2958,8 @@ class dl:
# So we re-add the keys from vaults earlier overwriting blanks or removed KIDs data.
drm.content_keys.update(from_vaults)
self.LICENSE_KEY_CACHE.update(drm.content_keys)
successful_caches = self.vaults.add_keys(drm.content_keys)
self.log.info(
f"Cached {len(drm.content_keys)} Key{'' if len(drm.content_keys) == 1 else 's'} to "
@@ -3002,6 +3026,26 @@ class dl:
is_track_kid = ["", "*"][kid == track_kid]
cached_key = self.LICENSE_KEY_CACHE.get(kid)
if cached_key:
drm.content_keys[kid] = cached_key
label = f"[text2]{kid.hex}:{cached_key}{is_track_kid} from cache"
if not any(f"{kid.hex}:{cached_key}" in x.label for x in cek_tree.children):
cek_tree.add(label)
if self.debug_logger:
self.debug_logger.log(
level="INFO",
operation="license_cache_hit",
service=self.service,
context={
"kid": kid.hex,
"content_key": cached_key,
"track": str(track),
"drm_type": "PlayReady",
},
)
continue
if not cdm_only:
content_key, vault_used = self.vaults.get_key(kid)
if content_key:
@@ -3010,6 +3054,7 @@ class dl:
if not any(f"{kid.hex}:{content_key}" in x.label for x in cek_tree.children):
cek_tree.add(label)
self.vaults.add_key(kid, content_key, excluding=vault_used)
self.LICENSE_KEY_CACHE[kid] = content_key
if self.debug_logger:
self.debug_logger.log_vault_query(
@@ -3084,6 +3129,8 @@ class dl:
drm.content_keys.update(from_vaults)
self.LICENSE_KEY_CACHE.update(drm.content_keys)
successful_caches = self.vaults.add_keys(drm.content_keys)
self.log.info(
f"Cached {len(drm.content_keys)} Key{'' if len(drm.content_keys) == 1 else 's'} to "