| Commit message (Collapse) | Author | Age |
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Wow, lots of missing 'static' on internal functions.
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Instead of supporting multiple thread IDs, we now merge together
thread IDs if one message is ever found to belong to more than one
thread. This allows for constructing complete threads when, for
example, a child message doesn't include a complete list of References
headers back to the beginning of the thread.
It also simplifies dealing with mapping a message ID to a thread ID
which is now a simple get_thread_id just like get_message_id, (and no
longer an iterator-based thing like get_tags).
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We were previously just doing fprintf;exit at each point, but I
wanted to add file and line-number details to all messages, so it
makes sense to use a single macro for that.
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What a great feeling to remove an XXX comment.
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Now that we are iterating over the thread terms instead, we can
drop this redundant storage (which should shrink our database a
tiny bit).
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Aside from increased code sharing, the benefit here is that now
thread_ids iterates over the terms of a message rather than the
thread_id value. So we'll now be able to drop that value.
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The generic notmuch_terms_t iterator should provide support for
notmuch_thread_ids_t when we switch as well, (And it would be
interesting to see if we could reasonably make this support a
PostingIterator too. Time will tell.)
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First, it's nice that for now we don't have any users yet, so we
can make incompatible changes to the database layout like this
without causing trouble. ;-)
There are a few reasons for this change. First, we now use value 0
uniformly as a timestamp for both mail and timestamp documents, (which
lets us cleanup an ugly and fragile bare 0 in the add_value and
get_value calls in the timestamp code).
Second, I want to drop the thread value entirely, so putting it at the
end of the list means we can drop it as compatible change in the
future. (I almost want to drop the message-ID value too, but it's nice
to be able to sort on it to get diff-able output from "notmuch dump".)
But the thread value we never use as a value, (we would never sort on
it, for example). And it's totally redundant with the thread terms we
store already. So expect it to disappear soon.
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What's good for the user is good for the internals.
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Yes, I'm being wishy-washy here, moving code back and forth. But
this is where these really do belong.
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This will be a nice safety check for internal sanity.
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These will be very helpful to implement an efficient "notmuch new"
command which imports new mail messages that have appeared.
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I'm really interested in the length of the data here, not the size
of the storage.
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With the recent improvements to the handling of message IDs we
"know" that a NULL message ID is impossible, (so we simply
abort if the impossible happens).
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Here's the second big fix to message-ID handling, (the first was to
generate message IDs when an email contained none). Now, with no
document missing a message ID, and no two documents having the same
message ID, we have a nice consistent database where the message ID
can be used as a unique key.
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This is the last piece needed for add_message to be able to properly
support a message with a duplicate message ID. This function creates
a new notmuch_message_t object but one that may reference an existing
document in the database.
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This function is only supposed to be called with a doc_id that
was queried from the database already. So there's an internal
error if no document with that doc_id can be found in the database.
In that case, return NULL.
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This will support the add_message function in incrementally creating
state in a new notmuch_message_t. The new functions are
_notmuch_message_set_filename
_notmuch_message_add_thread_id
_notmuch_message_ensure_thread_id
_notmuch_message_set_date
_notmuch_message_sync
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This is a new public function to find the filename of the original
email message for a message-object that was found in the database.
We may change this function in the future to support returning a
list of filenames, (for messages with duplicate message IDs).
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It's really up to the message to decide how to generate these.
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The idea here is to allow internal users to see a non-synced message
object, (for example, while parsing a message file and incrementally
adding terms, etc.). We're willing to take the care to get the
improved performance.
But for the public interface, keeping everything synced will be much
less confusing, (reference lots of sup bugs that happen due to
message state being altered by the user but not synced to the database).
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I'm glad that when I implemented "notmuch restore" I went through the
extra effort to take the code I had written in one sitting into over a
dozen commits. Sure enough, I hadn't tested well enough and had
totally broken "notmuch setup", (segfaults and bogus thread_id
values).
With the little commits I had made, git bisect saved the day, and I
went back to make the fixes right on top of the commits that
introduced the bugs. So now we octopus merge those in.
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Here's more evidence that C++ is a nightmare to program---or that
I'm smart enough to realize that C++ is more clever than I will
ever be.
Most of my issues with C++ have to do with it hiding things from
me that I'd really like to and expect to be aware of as a C
programmer.
For example, the specific problem here is that there's a
short-lived std::string, from which I just want to copy
the C string. I try to do that on the next line, but before
I can, C++ has already called the destructor on the std::string.
Now, C++ isn't alone in doing garbage collecting like this.
But in a *real* garbage-collecting system, everything would
work that way. For example, here, I'm still holding a pointer
to the C string contents, so if the garbage collector were
aware of that reference, then it might clean up the std::string
container and leave the data I'm still using.
But that's not what we get with C++. Instead, some things are
reference counted and collected, (like the std::string), and
some things just aren't (like the C string it contains). The
end result is that it's very fragile. It forces me to be aware
of the timing of hidden functions. In a "real" system I wouldn't
have to be aware of that timing, and in C the function just
wouldn't be hidden.
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With these two added, we now have enough functionality in the
library to implement "notmuch restore".
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Previously, this would allocate new memory with every call. That
was with talloc, of course, so there wasn't any leaking (eventually).
But since we're now calling this internally we want to be a little
less wasteful. It's easy enough to just stash the result into the
message on the first call, and then just return that on subsequent
calls.
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With this function, and the recently added support for
notmuch_message_get_thread_ids, we now recode the find_thread_ids
function to work just the way we expect a user of the public
notmuch API to work. Not too bad really.
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Along with all of the notmuch_thread_ids_t iterator functions.
Using a consistent idiom seems better here rather than returning
a comma-separated string and forcing the user to parse it.
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It's definitely a better fit there for now, (and can likely
eventually be made static as add_term moves from database
to message as well).
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None of these are strictly necessary, (everything was leak-free
without them), but notmuch_message_destroy can actually be useful
for when one query has many message results, but only one is needed
to be live at a time.
The destroy functions for results and tags are fairly gratuitous, as
there's unlikely to be any benefit from calling them. But they're all
easy to add, (all of these functions are just wrappers for talloc_free),
and we do so for consistency and completeness.
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I want to reserve the _destroy names for some public functions
I'm about to add.
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This is a fairly big milestone for notmuch. It's our first command
to do anything besides building the index, so it proves we can
actually read valid results out from the index.
It also puts in place almost all of the API and infrastructure we
will need to allow searching of the database.
Finally, with this change we are now using talloc inside of notmuch
which is truly a delight to use. And now that I figured out how
to use C++ objects with talloc allocation, (it requires grotty
parts of C++ such as "placement new" and "explicit destructors"),
we are valgrind-clean for "notmuch dump", (as in "no leaks are
possible").
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