[mod] debug-log the bootload of the CURRENCIES caches (CurrenciesDB)

The time for the bootload is measured and recorded.  To have an eye on the
bootload time is motivated by: In [1] it can be seen that the bootload of the
CURRENCIES cache takes about 2/3 of the time required to initialize SearXNG::

    6.068 <module>  searx/webapp.py:1
    └─ 6.068 wrapper  pyinstrument/context_manager.py:52
       ├─ 5.538 init  searx/webapp.py:1373
       │  ├─ 4.822 initialize  searx/search/__init__.py:34
       │  │  ├─ 4.631 ProcessorMap.init  searx/search/processors/__init__.py:47
       │  │  │  ├─ 4.607 OnlineCurrencyProcessor.initialize  searx/search/processors/online_currency.py:55
       │  │  │  │  └─ 4.607 CurrenciesDB.init  searx/data/currencies.py:25
       │  │  │  │     ├─ 4.601 CurrenciesDB.load  searx/data/currencies.py:34
       │  │  │  │     │  ├─ 4.572 ExpireCacheSQLite.set  searx/cache.py:334

In the example, the CurrenciesDB.init call takes 4.6 seconds... on my laptop,
CurrenciesDB.init takes only 0.7 seconds.  The absolute numerical values depend
on external conditions, where I already find 4-5 seconds very long. Test::

    $ rm /tmp/sxng_cache_*.db*
    $ make run 2>&1 | grep "searx.data.CURRENCIES"
    DEBUG   searx.data : init searx.data.CURRENCIES
    DEBUG   searx.data : init searx.data.CURRENCIES added 9089 items in 0.7623255252838135 sec.

[1] https://github.com/searxng/searxng/issues/5223#issuecomment-3323083411

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

1 files changed, 7 insertions, 0 deletions

diff --git a/searx/data/currencies.py b/searx/data/currencies.py
index a328789e3..33aa9530c 100644
--- a/searx/data/currencies.py
+++ b/searx/data/currencies.py
@@ -6,6 +6,7 @@ __all__ = ["CurrenciesDB"]
 import typing as t
 import json
 import pathlib
+import time
 
 from .core import get_cache, log
 
@@ -32,6 +33,7 @@ class CurrenciesDB:
         #     in /tmp and will be rebuild during the reboot anyway
 
     def load(self):
+        _start = time.time()
         log.debug("init searx.data.CURRENCIES")
         with open(self.json_file, encoding="utf-8") as f:
             data_dict: dict[str, dict[str, str]] = json.load(f)
@@ -39,6 +41,11 @@ class CurrenciesDB:
             self.cache.set(key=key, value=value, ctx=self.ctx_names, expire=None)
         for key, value in data_dict["iso4217"].items():
             self.cache.set(key=key, value=value, ctx=self.ctx_iso4217, expire=None)
+        log.debug(
+            "init searx.data.CURRENCIES added %s items in %s sec.",
+            len(data_dict["names"]) + len(data_dict["iso4217"]),
+            time.time() - _start,
+        )
 
     def name_to_iso4217(self, name: str) -> str | None:
         self.init()