Commit graph

107 commits

Author SHA1 Message Date
Nick Alexander
06056a8468 Part 6: Lift TxReport to core crate.
The `core` create didn't exist when the `db` was started, but this
type is clearly part of the public interface of Mentat.
2018-07-05 16:33:51 -07:00
Nick Alexander
76507623ac Part 4: Prepare EDN Entity type for interning tempids during parsing.
This is all part of moving the entity builder away from building term
instances and toward building entity instances.  One of the nice
things that the existing term interface does is allow consumers to use
lightweight reference counted tempid handles; I don't want to lose
that, so we'll build it into the entity data structures directly.
2018-07-05 11:17:20 -07:00
Nick Alexander
106d6fae11 Part 3: Implement Deref and DerefMut for InternSet.
This pattern is generally how newtype wrappers (like `struct
Foo(Bar)`) are implemented in Rust.
2018-07-05 11:16:55 -07:00
Nick Alexander
02a163a10f Part 2: Use ValueRc in InternSet.
We haven't observed performance issues using `Arc` instead of `Rc`,
and we want to be able to include things that are interned (including,
soon, `TempId` instances) in errors coming out of the
transactor.  (And `Rc` isn't `Sync`, so it can't be included in errors
directly.)
2018-07-05 11:16:53 -07:00
Nick Alexander
87f850a44e Part 1: Move intern_set into edn crate.
It's not great to keep lifting functionality higher and higher up the
crate hierarchy, but we really do want to intern while we parse.
Eventually, I expect that we will split the `edn` crate into `types`
and `parsing`, and the `types` crate can depend on a more efficient
interning dependency.
2018-07-05 11:16:48 -07:00
Nick Alexander
8725bad18c Pre: Fix error printing rusqlite::Error. 2018-06-30 14:58:23 -07:00
Nick Alexander
0e4991fa26 Make db/ use DbErrorKind. 2018-06-27 15:05:43 -07:00
Thom
72a9b302f9
Rename or delete things so that there is only one type named Entid (#768)
* Delete the (apparently unused) EntId

* Rename edn's Entid to EntidOrIdent to avoid confusion with the Entid that's actually an i64

* Fix travis beta bustage (This is actually unrelated to entids, but is a trivial fix nonetheless)
2018-06-26 16:34:18 -07:00
Grisha Kruglov
31de5be64f Convert db/ to failure. 2018-06-20 14:42:34 -07:00
Thom Chiovoloni
99a73ccb03 Avoid using 1.26.0-only features when using sqlcipher, and move the sqlcipher Store support to the correct file 2018-06-13 22:48:28 -07:00
Thom
6a1a265894
Add support for using sqlcipher (#737). Fixes #118 2018-06-13 08:49:40 -07:00
Nick Alexander
e68cc4016c Part 7: Remove tx entirely.
This was left over from #681.
2018-06-04 15:04:39 -07:00
Richard Newman
b2e98f44f6
Generalize Entity by value type. (#701) (#691) r=rnewman
* Part 3: Parameterize Entity by value type.

This isn't quite right, because after parsing, we shouldn't care
about` `edn::ValueAndSpan`, we should care only about edn::Value.
However, I think we can drop `ValueAndSpan` entirely if we just use
`rust-peg` (and its simpler error messages) rather than a mix of
`rust-peg` and `combine`.

In any case, this paves the way to transacting `Entity<TypedValue>`,
which is a nice step towards building general entities.

* Part 1: Add AttributePlace.

* Part 2: Name other places EntityPlace and ValuePlace.

Now we're consistent and closer to self-documenting.  Both matter more
as we expose `Entity` as the thing to build for programmatic usage.

* Part 4: Allow Ident and TempId in ValuePlace.

The parser will never produce these, since determining whether an
integer/keyword or string is an ident or a tempid, respectively, in
the value place requires the schema.

But a builder that produces `Entity` instances directly will want to
produce these.
2018-05-15 00:43:07 -07:00
Nick Alexander
46c2a0801f Add type checking and constraint checking to the transactor. (#663, #532, #679)
This should address #663, by re-inserting type checking in the
transactor stack after the entry point used by the term builder.

Before this commit, we were using an SQLite UNIQUE index to assert
that no `[e a]` pair, with `a` a cardinality one attribute, was
asserted more than once.  However, that's not in line with Datomic,
which treats transaction inputs as a set and allows a single datom
like `[e a v]` to appear multiple times.  It's both awkward and not
particularly efficient to look for _distinct_ repetitions in SQL, so
we accept some runtime cost in order to check for repetitions in the
transactor.  This will allow us to address #532, which is really about
whether we treat inputs as sets.  A side benefit is that we can
provide more helpful error messages when the transactor does detect
that the input truly violates the cardinality constraints of the
schema.

This commit builds a trie while error checking and collecting final
terms, which should be fairly efficient.  It also allows a simpler
expression of input-provided :db/txInstant datoms, which in turn
uncovered a small issue with the transaction watcher, where-by the
watcher would not see non-input-provided :db/txInstant datoms.

This transition to Datomic-like input-as-set semantics allows us to
address #532.  Previously, two tempids that upserted to the same entid
would produce duplicate datoms, and that would have been rejected by
the transactor -- correctly, since we did not allow duplicate datoms
under the input-as-list semantics.  With input-as-set semantics,
duplicate datoms are allowed; and that means that we must allow
tempids to be equivalent, i.e., to resolve to the same tempid.

To achieve this, we:
- index the set of tempids
- identify tempid indices that share an upsert
- map tempids to a dense set of contiguous integer labels

We use the well-known union-find algorithm, as implemented by
petgraph, to efficiently manage the set of equivalent tempids.

Along the way, I've fixed and added tests for two small errors in the
transactor.  First, don't drop datoms resolved by upsert (#679).
Second, ensure that complex upserts are allocated.

I don't know quite what happened here.  The Clojure implementation
correctly kept complex upserts that hadn't resolved as complex
upserts (see
9a9dfb502a/src/common/datomish/transact.cljc (L436))
and then allocated complex upserts if they didn't resolve (see
9a9dfb502a/src/common/datomish/transact.cljc (L509)).

Based on the code comments, I think the Rust implementation must have
incorrectly tried to optimize by handling all complex upserts in at
most a single generation of evolution, and that's just not correct.
We're effectively implementing a topological sort, using very specific
domain knowledge, and its not true that a node in a topological sort
can be considered only once!
2018-05-14 15:22:45 -07:00
Nick Alexander
e5e37178af Pre: Remove ancient Clojure code comments. 2018-05-14 15:22:45 -07:00
Nick Alexander
4fde4fe0a6 Bustage fixes: compile on stable; avoid unused variable warning. 2018-05-11 10:22:57 -07:00
Richard Newman
3dc68bcd38 Combine NamespacedKeyword and Keyword. (#689) r=nalexander
* Make properties on NamespacedKeyword/NamespacedSymbol private

* Use only a single String for NamespacedKeyword/NamespacedSymbol

* Review comments.

* Remove unsafe code in namespaced_name.

Benchmarking shows approximately zero change.

* Allow the types of ns and name to differ when constructing a NamespacedName.

* Make symbol namespaces optional.

* Normalize names of keyword/symbol constructors.

This will make the subsequent refactor much less painful.

* Use expect not unwrap.

* Merge Keyword and NamespacedKeyword.
2018-05-11 09:52:17 -07:00
Nick Alexander
cbffe5e545 Use rust-peg for tx parsing.
There are few reasons to do this:

- it's difficult to add symbol interning to combine-based parsers like
  tx-parser -- literally every type changes to reflect the interner,
  and that means every convenience macro we've built needs to chagne.
  It's trivial to add interning to rust-peg-based parsers.

- combine has rolled forward to 3.2, and I spent a similar amount of
  time investigating how to upgrade tx-parser (to take advantage of
  the new parser! macros in combine that I think are necessary for
  adapting to changing types) as I did just converting to rust-peg.

- it's easy to improve the error messages in rust-peg, where-as I have
  tried twice to improve the nested error messages in combine and am
  stumped.

- it's roughly 4x faster to parse strings directly as opposed to
  edn::ValueAndSpan, and it'll be even better when we intern directly.
2018-05-10 10:24:05 -07:00
Nick Alexander
e437944d94 Pre: Don't use tx-parser for destructuring map notation.
This was always a choice, but we've outgrown it: now we want to accept
value types that don't come from EDN and/or tx-parser.
2018-05-10 10:19:54 -07:00
Nick Alexander
4c4af46315 Add TransactableValue abstracting value places that can be transacted.
This is a stepping stone to transacting entities that are not based on
`edn::ValueAndSpan`.  We need to turn some value places (general) into
entity places (restricted), and those restrictions are captured in
tx-parser right now.  But for `TypedValue` value places, those
restrictions are encoded in the type itself.  This lays the track to
accept other value types in value places, which is good for
programmatic builder interfaces.
2018-05-10 10:19:54 -07:00
Richard Newman
e21156a754
Implement simple pull expressions (#638) r=nalexander
* Refactor AttributeCache populator code for use from pull.

* Pre: add to_value_rc to Cloned.

* Pre: add From<StructuredMap> for Binding.

* Pre: clarify Store::open_empty.

* Pre: StructuredMap cleanup.

* Pre: clean up a doc test.

* Split projector crate. Pass schema to projector.

* CLI support for printing bindings.

* Add and use ConjoiningClauses::derive_types_from_find_spec.

* Define pull types.

* Implement pull on top of the attribute cache layer.

* Add pull support to the projector.

* Parse pull expressions.

* Add simple pull support to connection objects.

* Tests for pull.

* Compile with Rust 1.25.

The only choice involved in this commit is that of replacing the
anonymous lifetime '_ with a named lifetime for the cache; since we're
accepting a Known, which includes the cache in question, I think it's
clear that we expect the function to apply to any given cache
lifetime.

* Review comments.

* Bail on unnamed attribute.

* Make assert_parse_failure_contains safe to use.

* Rework query parser to report better errors for pull.

* Test for mixed wildcard and simple attribute.
2018-05-04 12:56:00 -07:00
Nick Alexander
2b82ffb2e5 [tx] Fail transactions where complex upserts resolve to multiple entids. (#670)
This innocuous looking change (upserts_ev -> upserts_e -> resolved in
all situations, rather than upserts_ev -> resolved in some situations)
is a significant change in semantics and assumptions in the
transactor.  Witness the large comment being removed about the same
tempid resolving in different generations!

To support this change, we provide more holistic errors for
conflicting upserts, which entails collecting some (relatively
expensive) diagnostic data.

I left in some debug logging, simply since it shouldn't hurt in
general, and will likely be useful for the next bug we see in the
transactor.
2018-05-01 15:34:44 -07:00
Nick Alexander
32ed56685e (tx) Replace :db/tx with (transaction-tx) transaction function and broaden support. (#664)
:db/tx (and Datomic's version, :datomic/tx) suffer from the same
ambiguities that [a v] lookup references do -- determining the type of
the result is context sensitive.  (In this case, is :db/tx a reference
to the current transaction ID, or is it a valid keyword?)  This commit
addresses the ambiguity by introducing a notion of a transaction
functions, and provides a little scaffolding for adding more (should
the need arise).  I left the scaffolding in place rather than handling
just (transaction-tx) because I started trying to
implement (transaction-instant) as well, which is more difficult --
see the comments.

It's worth noting that this approach generalizes more or less directly
to ?input variables, since those can be eagerly bound like the
implemented transaction function (transaction-tx).
2018-04-26 19:32:14 -07:00
Richard Newman
f979044ba1
Refactor value type boxing. (#659) r=nalexander
* Pre: eliminate some occurrences of Rc, largely through the magic of Into.
* Pre: introduce FromRc to convert between refcounted types.
* Introduce ValueRc as an abstraction over Rc/Arc choice.
* Move Cloned to core.
* Move CString-creation methods to TypedValue.
* Finish transition.
2018-04-25 14:23:27 -07:00
Richard Newman
27dde378e0 Allow retraction of some schema attributes. (#379) r=nalexander 2018-04-09 09:47:49 -07:00
Richard Newman
4d8e179a59
Expose component_attributes on Schema. (#623) r=nalexander
Some parts of the query engine and transactor need to know whether an
attribute is a component attribute, and sometimes want to do so in
a generated SQL query. This is one way to do that.
2018-04-03 14:25:53 -07:00
Richard Newman
6c54e1d370
Support :db/noHistory for attributes. (#622) r=nalexander
At this point we never discard history, but this completes the API support for doing so.
2018-04-03 14:23:46 -07:00
Richard Newman
9cc5cbf288
Rename the helpful variant, AttributeBuilder::new, to AttributeBuilder::helpful. (#625) r=nalexander 2018-04-03 14:23:20 -07:00
Richard Newman
66b892572c
Don't create a CommandExecutor if there are no observers. (#603) (#604) r=emily
* Don't create a CommandExecutor if there are no observers. (#603)
* Don't log if our executor channel goes away. This is routine.
2018-04-03 09:18:22 -07:00
Emily Toop
ab957948b4 Move to using watcher.
Simplify.

This has a watcher collect txid -> AttributeSet mappings each time a
transact occurs. On commit we retrieve those mappings and hand them over
to the observer service, which filters them and packages them up for
dispatch.

Tidy up
2018-03-20 16:27:35 +00:00
Emily Toop
d4365fa4cd Execute commands in a separate thread
Command Queue Executor to watch for new commands and execute on longer running background thread
2018-03-20 16:27:35 +00:00
Emily Toop
9f3d2c08b2 Populate changeset of attributes inside TxReport during transact.
Batch up TxReports for entire transaction.
Notify observers about committed transaction.
Store transaction observer service inside Conn
2018-03-20 16:27:35 +00:00
Emily Toop
8d60f2b3d1 Expose tx observation publicly 2018-03-20 16:27:35 +00:00
Emily Toop
dfa0d3e321 Add TxObservers, Commands and TxObservationService.
These are the base types upon which we will build our transaction observation
2018-03-20 16:27:35 +00:00
Richard Newman
1817ce7c0b Performance and cleanup. r=emily
* Use fixed-size arrays for bootstrap datoms, not vecs.
* Wide-ranging cleanup.

    This commit:
    - Deletes some dead code.
    - Marks some functions only used by tests as cfg(test).
    - Adds pub(crate) to a bunch of functions.
    - Cleans up a few other nits.
2018-03-06 09:03:00 -08:00
Richard Newman
f42ae35b70 Update cache on write. (#566) r=emily
* Use the cache to make constant queries super fast.
* Fix translate tests to match: we no longer generate SQL for many of them!
* Accumulate additions and removals into the cache.
    * Make attribute cache clone-on-write; store it in Metadata.
    * Allow caching of fulltext attributes, interning strings.
2018-03-06 09:01:20 -08:00
Richard Newman
54bd883c65 Follow-up: remove logging and such elsewhere in the codebase. 2018-02-21 11:51:45 -08:00
Richard Newman
e33fe71c47 Rework caching and use it inside the query engine. (#553) r=emily
This puts caching in mentat_db, adds a reverse lookup capability for
unique attributes, and populates bidirectional caches with a single
SQL cursor walk.

Differentiate between begin_read and begin_uncached_read.

Note that we still allow toggling within InProgress, because there might be
transient local state that makes starting a new transaction impossible.
2018-02-21 11:51:45 -08:00
Richard Newman
df3cdb5db6 Allow two datoms in the same transaction to have the same fulltext string. (#565) r=emily 2018-02-21 11:51:45 -08:00
Richard Newman
ae91603bd0 Provide an API for creating truly empty stores (#561) r=grisha
* Part 1: split create_current_version.

* Part 2: add Store::create_empty and Conn::empty.

* Part 3 - Expose 'open_empty' command via CLI
2018-02-16 02:01:00 -08:00
Richard Newman
d11810dca7 Fix warning in tx.rs. 2018-02-09 08:51:13 -08:00
Emily Toop
715d434945
Create generalized in-memory cache for attributes (#525)
* Nit: Alphabetical ordering of imports

* Create Cache and provide functions for calling it

* Get tests working. Move to using NamespacedKeyword over KnownEntid in function signature

* Add is_cached check to caching tests

* Move lazy and add/remove boolean flags to enums

* Move function definitions into generic trait and implement trait for AttributeCache

* Remove lazy cache and generalize cache

* Update tests

* Eager cache becomes simple key value store. AttributeMap handles attribute storing specifics

* Update tests to test presence of correct values in cache

* Move EagerCache, AttributeValueProvider and ValueProvider into mentat_db

* Add test for get_for_entid

* Add test for lookup attribute

* Make caches cloneable. Add value_for alongside values_for

* Use cache in attribute lookups

* Split test for values and value and add cardinality

* address review feedback r=rnewman
2018-02-07 10:56:12 -08:00
Grisha Kruglov
d848d954cf Issue 508 - Iterating transcation processor r=rnewman
Review comments
2018-02-06 12:24:12 -08:00
Richard Newman
e9ed103723 Revert "Make debug structs and functions non-public. r=grisha"
This reverts commit e817f67470.
2018-02-06 11:06:06 -08:00
Richard Newman
e817f67470 Make debug structs and functions non-public. r=grisha 2018-02-06 10:25:42 -08:00
Richard Newman
37a7c9ea48 Validate attributes installed after open. (#538) r=emily
Make AttributeBuilder optionally helpful, fix tests.
2018-02-01 09:29:04 -08:00
Edouard Oger
3bf7459315 Allow customers to assert facts about the current transaction. (#225) r=rnewman
Also move `now` into core, implement microsecond truncation.

This is so we don't return a more granular -- and thus subtly different --
timestamp in a `TxReport` than we put into the store.
2018-01-29 16:46:04 -08:00
Richard Newman
ef9f2d9c51 Don't allow violation of cardinality-one restrictions within a single tx. (#531) r=nalexander 2018-01-23 15:11:38 -08:00
Richard Newman
812f10b3e4 Add an EntityBuilder abstraction. r=nalexander,emily
This includes two other changes:

* Split transact to expose an interface for TermWithTempIds.
* Return TxReport from each InProgress operation, not from commit.
2018-01-23 08:52:09 -08:00
Richard Newman
3d28949add Describe the default core schema, v1 (:db.schema/core). r=nalexander 2018-01-23 08:51:58 -08:00