jcoffey-dev
b9d908bda2
A per-node cache of message blobs keyed by content hash, 64 MiB by default (INBUXA_BLOB_CACHE sets it; 0 turns it off), fed on write and on read. Upstream fetched a message's blob from the blob store every time: the spool blob straight back for delivery, the same message for BODYSTRUCTURE and then BODY[], every outbound retry; on the cluster each is a round trip to the object store. Server::get_message_blob serves the message read paths (IMAP FETCH, POP3, JMAP Email/get and blob sections, the index task, outbound delivery, DSNs, push, holds and the journal). Named keys that are rewritten in place keep using the blob store directly. A blob above a sixteenth of the capacity is not cached.