lib-index: Add mail_cache_purge_drop_field event

diff --git a/src/lib-index/mail-cache-purge.c b/src/lib-index/mail-cache-purge.c
index 60925677be04bc029846d906487bfe96258c43ab..c9af9ba653729a0b2bcf5ae4c2c8a4bf61bcc485 100644 (file)
--- a/src/lib-index/mail-cache-purge.c
+++ b/src/lib-index/mail-cache-purge.c
@@ -24,6 +24,19 @@ struct mail_cache_copy_context {
        bool new_msg;
 };
 
+static const char *cache_decision_str(enum mail_cache_decision_type dec)
+{
+       switch (dec & ~MAIL_CACHE_DECISION_FORCED) {
+       case MAIL_CACHE_DECISION_NO:
+               return "no";
+       case MAIL_CACHE_DECISION_TEMP:
+               return "temp";
+       case MAIL_CACHE_DECISION_YES:
+               return "yes";
+       }
+       i_unreached();
+}
+
 static void
 mail_cache_merge_bitmask(struct mail_cache_copy_context *ctx,
                         const struct mail_cache_iterate_field *field)
@@ -227,7 +240,19 @@ mail_cache_copy(struct mail_cache *cache, struct mail_index_transaction *trans,
                        /* if the decision isn't forced and this field hasn't
                           been accessed for a while, drop it */
                        if ((dec & MAIL_CACHE_DECISION_FORCED) == 0 &&
-                           priv->field.last_used < max_drop_time) {
+                           priv->field.last_used < max_drop_time &&
+                           dec != MAIL_CACHE_DECISION_NO) {
+                               const char *dec_str = cache_decision_str(dec);
+                               struct event_passthrough *e =
+                                       event_create_passthrough(event)->
+                                       set_name("mail_cache_purge_drop_field")->
+                                       add_str("field", priv->field.name)->
+                                       add_str("decision", dec_str)->
+                                       add_int("last_used", priv->field.last_used);
+                               e_debug(e->event(), "Purge dropped field %s "
+                                       "(decision=%s, last_used=%"PRIdTIME_T")",
+                                       priv->field.name, dec_str,
+                                       priv->field.last_used);
                                dec = MAIL_CACHE_DECISION_NO;
                                priv->field.decision = dec;
                        }