greg/mentat
1
0
Fork 0
Code Issues 294 Pull requests Projects Releases 9 Packages Wiki Activity

Add an EntityBuilder abstraction. r=nalexander,emily

Browse source 
This includes two other changes:

* Split transact to expose an interface for TermWithTempIds.
* Return TxReport from each InProgress operation, not from commit.
This commit is contained in:
Richard Newman 2018-01-23 08:43:26 -08:00
parent 3d28949add
commit 812f10b3e4
7 changed files with 575 additions and 48 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
Cargo.toml
View file

@ -20,6 +20,7 @@ rustc_version = "0.1.7"
[dependencies]
chrono = "0.4"
error-chain = { git = "https://github.com/rnewman/error-chain", branch = "rnewman/sync" }
lazy_static = "0.2"
time = "0.1"
[dependencies.rusqlite]

8
db/src/lib.rs
View file

@ -44,7 +44,7 @@ pub mod errors;
mod metadata;
mod schema;
pub mod types;
mod internal_types;
pub mod internal_types; // pub because we need them for building entities programmatically.
mod upsert_resolution;
mod tx;
@ -70,7 +70,11 @@ pub use db::{
new_connection,
};
pub use tx::transact;
pub use tx::{
transact,
transact_terms,
};
pub use types::{
DB,
PartitionMap,

64
db/src/tx.rs
View file

@ -510,9 +510,6 @@ impl<'conn, 'a> Tx<'conn, 'a> {
/// This approach is explained in https://github.com/mozilla/mentat/wiki/Transacting.
// TODO: move this to the transactor layer.
pub fn transact_entities<I>(&mut self, entities: I) -> Result<TxReport> where I: IntoIterator<Item=Entity> {
// TODO: push these into an internal transaction report?
let mut tempids: BTreeMap<TempId, KnownEntid> = BTreeMap::default();
// Pipeline stage 1: entities -> terms with tempids and lookup refs.
let (terms_with_temp_ids_and_lookup_refs, tempid_set, lookup_ref_set) = self.entities_into_terms_with_temp_ids_and_lookup_refs(entities)?;
@ -522,9 +519,16 @@ impl<'conn, 'a> Tx<'conn, 'a> {
let terms_with_temp_ids = self.resolve_lookup_refs(&lookup_ref_map, terms_with_temp_ids_and_lookup_refs)?;
self.transact_simple_terms(terms_with_temp_ids, tempid_set)
}
pub fn transact_simple_terms<I>(&mut self, terms: I, tempid_set: InternSet<TempId>) -> Result<TxReport> where I: IntoIterator<Item=TermWithTempIds> {
// TODO: push these into an internal transaction report?
let mut tempids: BTreeMap<TempId, KnownEntid> = BTreeMap::default();
// Pipeline stage 3: upsert tempids -> terms without tempids or lookup refs.
// Now we can collect upsert populations.
let (mut generation, inert_terms) = Generation::from(terms_with_temp_ids, &self.schema)?;
let (mut generation, inert_terms) = Generation::from(terms, &self.schema)?;
// And evolve them forward.
while generation.can_evolve() {
@ -685,28 +689,20 @@ impl<'conn, 'a> Tx<'conn, 'a> {
}
}
/// Transact the given `entities` against the given SQLite `conn`, using the given metadata.
/// If you want this work to occur inside a SQLite transaction, establish one on the connection
/// prior to calling this function.
///
/// This approach is explained in https://github.com/mozilla/mentat/wiki/Transacting.
// TODO: move this to the transactor layer.
pub fn transact<'conn, 'a, I>(
conn: &'conn rusqlite::Connection,
/// Initialize a new Tx object with a new tx id and a tx instant. Kick off the SQLite conn, too.
fn start_tx<'conn, 'a>(conn: &'conn rusqlite::Connection,
mut partition_map: PartitionMap,
schema_for_mutation: &'a Schema,
schema: &'a Schema,
entities: I) -> Result<(TxReport, PartitionMap, Option<Schema>)> where I: IntoIterator<Item=Entity> {
schema: &'a Schema) -> Result<Tx<'conn, 'a>> {
let tx_instant = ::now(); // Label the transaction with the timestamp when we first see it: leading edge.
let tx_id = partition_map.allocate_entid(":db.part/tx");
conn.begin_tx_application()?;
let mut tx = Tx::new(conn, partition_map, schema_for_mutation, schema, tx_id, tx_instant);
let report = tx.transact_entities(entities)?;
Ok(Tx::new(conn, partition_map, schema_for_mutation, schema, tx_id, tx_instant))
}
fn conclude_tx(tx: Tx, report: TxReport) -> Result<(TxReport, PartitionMap, Option<Schema>)> {
// If the schema has moved on, return it.
let next_schema = match tx.schema_for_mutation {
Cow::Borrowed(_) => None,
@ -714,3 +710,35 @@ pub fn transact<'conn, 'a, I>(
};
Ok((report, tx.partition_map, next_schema))
}
/// Transact the given `entities` against the given SQLite `conn`, using the given metadata.
/// If you want this work to occur inside a SQLite transaction, establish one on the connection
/// prior to calling this function.
///
/// This approach is explained in https://github.com/mozilla/mentat/wiki/Transacting.
// TODO: move this to the transactor layer.
pub fn transact<'conn, 'a, I>(conn: &'conn rusqlite::Connection,
partition_map: PartitionMap,
schema_for_mutation: &'a Schema,
schema: &'a Schema,
entities: I) -> Result<(TxReport, PartitionMap, Option<Schema>)>
where I: IntoIterator<Item=Entity> {
let mut tx = start_tx(conn, partition_map, schema_for_mutation, schema)?;
let report = tx.transact_entities(entities)?;
conclude_tx(tx, report)
}
/// Just like `transact`, but accepts lower-level inputs to allow bypassing the parser interface.
pub fn transact_terms<'conn, 'a, I>(conn: &'conn rusqlite::Connection,
partition_map: PartitionMap,
schema_for_mutation: &'a Schema,
schema: &'a Schema,
terms: I,
tempid_set: InternSet<TempId>) -> Result<(TxReport, PartitionMap, Option<Schema>)>
where I: IntoIterator<Item=TermWithTempIds> {
let mut tx = start_tx(conn, partition_map, schema_for_mutation, schema)?;
let report = tx.transact_simple_terms(terms, tempid_set)?;
conclude_tx(tx, report)
}

73
src/conn.rs
View file

@ -30,15 +30,22 @@ use mentat_core::{
ValueType,
};
use mentat_core::intern_set::InternSet;
use mentat_db::db;
use mentat_db::{
transact,
transact_terms,
PartitionMap,
TxReport,
};
use mentat_db::internal_types::TermWithTempIds;
use mentat_tx;
use mentat_tx::entities::TempId;
use mentat_tx_parser;
use errors::*;
@ -52,6 +59,9 @@ use query::{
QueryResults,
};
use entity_builder::{
InProgressBuilder,
};
/// Connection metadata required to query from, or apply transactions to, a Mentat store.
///
@ -113,7 +123,6 @@ pub struct InProgress<'a, 'c> {
generation: u64,
partition_map: PartitionMap,
schema: Schema,
last_report: Option<TxReport>, // For now we track only the last, but we could accumulate all.
}
/// Represents an in-progress set of reads to the store. Just like `InProgress`,
@ -222,8 +231,27 @@ impl<'a, 'c> HasSchema for InProgress<'a, 'c> {
}
}
impl<'a, 'c> InProgress<'a, 'c> {
pub fn transact_entities<I>(&mut self, entities: I) -> Result<()> where I: IntoIterator<Item=mentat_tx::entities::Entity> {
pub fn builder(self) -> InProgressBuilder<'a, 'c> {
InProgressBuilder::new(self)
}
pub fn transact_terms<I>(&mut self, terms: I, tempid_set: InternSet<TempId>) -> Result<TxReport> where I: IntoIterator<Item=TermWithTempIds> {
let (report, next_partition_map, next_schema) = transact_terms(&self.transaction,
self.partition_map.clone(),
&self.schema,
&self.schema,
terms,
tempid_set)?;
self.partition_map = next_partition_map;
if let Some(schema) = next_schema {
self.schema = schema;
}
Ok(report)
}
pub fn transact_entities<I>(&mut self, entities: I) -> Result<TxReport> where I: IntoIterator<Item=mentat_tx::entities::Entity> {
// We clone the partition map here, rather than trying to use a Cell or using a mutable
// reference, for two reasons:
// 1. `transact` allocates new IDs in partitions before and while doing work that might
@ -237,26 +265,20 @@ impl<'a, 'c> InProgress<'a, 'c> {
if let Some(schema) = next_schema {
self.schema = schema;
}
self.last_report = Some(report);
Ok(())
Ok(report)
}
pub fn transact(&mut self, transaction: &str) -> Result<()> {
pub fn transact(&mut self, transaction: &str) -> Result<TxReport> {
let assertion_vector = edn::parse::value(transaction)?;
let entities = mentat_tx_parser::Tx::parse(&assertion_vector)?;
self.transact_entities(entities)
}
pub fn last_report(&self) -> Option<&TxReport> {
self.last_report.as_ref()
}
pub fn rollback(mut self) -> Result<()> {
self.last_report = None;
pub fn rollback(self) -> Result<()> {
self.transaction.rollback().map_err(|e| e.into())
}
pub fn commit(self) -> Result<Option<TxReport>> {
pub fn commit(self) -> Result<()> {
// The mutex is taken during this entire method.
let mut metadata = self.mutex.lock().unwrap();
@ -273,11 +295,12 @@ impl<'a, 'c> InProgress<'a, 'c> {
metadata.generation += 1;
metadata.partition_map = self.partition_map;
if self.schema != *(metadata.schema) {
metadata.schema = Arc::new(self.schema);
}
Ok(self.last_report)
Ok(())
}
}
@ -362,7 +385,6 @@ impl Conn {
generation: current_generation,
partition_map: current_partition_map,
schema: (*current_schema).clone(),
last_report: None,
})
}
@ -394,8 +416,8 @@ impl Conn {
let entities = mentat_tx_parser::Tx::parse(&assertion_vector)?;
let mut in_progress = self.begin_transaction(sqlite)?;
in_progress.transact_entities(entities)?;
let report = in_progress.commit()?.expect("we always get a report");
let report = in_progress.transact_entities(entities)?;
in_progress.commit()?;
Ok(report)
}
@ -488,9 +510,9 @@ mod tests {
// Scoped borrow of `conn`.
{
let mut in_progress = conn.begin_transaction(&mut sqlite).expect("begun successfully");
in_progress.transact(t).expect("transacted successfully");
let one = in_progress.last_report().unwrap().tempids.get("one").expect("found one").clone();
let two = in_progress.last_report().unwrap().tempids.get("two").expect("found two").clone();
let report = in_progress.transact(t).expect("transacted successfully");
let one = report.tempids.get("one").expect("found one").clone();
let two = report.tempids.get("two").expect("found two").clone();
assert!(one != two);
assert!(one == tempid_offset || one == tempid_offset + 1);
assert!(two == tempid_offset || two == tempid_offset + 1);
@ -499,10 +521,9 @@ mod tests {
.expect("query succeeded");
assert_eq!(during, QueryResults::Scalar(Some(TypedValue::Ref(one))));
in_progress.transact(t2).expect("t2 succeeded");
let report = in_progress.commit()
.expect("commit succeeded");
let three = report.unwrap().tempids.get("three").expect("found three").clone();
let report = in_progress.transact(t2).expect("t2 succeeded");
in_progress.commit().expect("commit succeeded");
let three = report.tempids.get("three").expect("found three").clone();
assert!(one != three);
assert!(two != three);
}
@ -528,10 +549,10 @@ mod tests {
// Scoped borrow of `sqlite`.
{
let mut in_progress = conn.begin_transaction(&mut sqlite).expect("begun successfully");
in_progress.transact(t).expect("transacted successfully");
let report = in_progress.transact(t).expect("transacted successfully");
let one = in_progress.last_report().unwrap().tempids.get("one").expect("found it").clone();
let two = in_progress.last_report().unwrap().tempids.get("two").expect("found it").clone();
let one = report.tempids.get("one").expect("found it").clone();
let two = report.tempids.get("two").expect("found it").clone();
// The IDs are contiguous, starting at the previous part index.
assert!(one != two);

455
src/entity_builder.rs Normal file
View file

@ -0,0 +1,455 @@
// Copyright 2016 Mozilla
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
// this file except in compliance with the License. You may obtain a copy of the
// License at http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software distributed
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
// specific language governing permissions and limitations under the License.
// We have a little bit of a dilemma in Mentat.
// The public data format for transacting is, fundamentally, a big string: EDN.
// The internal data format for transacting is required to encode the complexities of
// processing that format: temporary IDs, lookup refs, input spans, etc.
//
// See mentat_tx::entities::Entity and all of its child enums to see how complex this gets.
//
// A programmatic consumer doesn't want to build something that looks like:
//
// Entity::AddOrRetract {
// op: OpType::Add,
// e: EntidOrLookupRefOrTempId::LookupRef(LookupRef {
// a: Entid::Ident(NamespacedKeyword::new("test", "a1")),
// v: Value::Text("v1".into()),
// }),
// a: Entid::Ident(NamespacedKeyword::new("test", "a")),
// v: AtomOrLookupRefOrVectorOrMapNotation::Atom(ValueAndSpan::new(SpannedValue::Text("v".into()), Span(44, 47))),
// }));
//
// but neither do they want to pay the cost of parsing
//
// [[:test/a1 "v1"] :test/a "v"]
//
// at runtime.
//
// It's tempting to think that we can do something 'easy' here -- to skip the hard work of transacting
// tempids, for example -- but to do so will hobble the system for little payoff. It's also worth
// remembering that the transactor does significant validation work, which we don't want to
// reimplement here.
//
// The win we seek is to make it easier to _write_ these inputs without significantly restricting
// what can be said.
//
// There are two ways we could go from here.
//
// The first is to expose tx parsing as a macro: parse that string at compile time into the
// equivalent `Entity` data structure. That's fine for completely static input data.
//
// The second is to expose a declarative, programmatic builder pattern for constructing entities.
//
// We probably need both, but this file provides the latter. Unfortunately, Entity -- the input to
// the transactor -- is intimately tied to EDN and to spanned values.
use mentat_core::{
KnownEntid,
TypedValue,
};
use mentat_core::intern_set::InternSet;
use mentat_core::util::Either;
use mentat_db::{
TxReport,
};
use mentat_db::internal_types::{
KnownEntidOr,
TempIdHandle,
Term,
TermWithTempIds,
TypedValueOr,
};
use mentat_tx::entities::{
OpType,
TempId,
};
use conn::{
InProgress,
};
use errors::{
Result,
};
pub type Terms = (Vec<TermWithTempIds>, InternSet<TempId>);
pub struct TermBuilder {
tempids: InternSet<TempId>,
terms: Vec<TermWithTempIds>,
}
pub struct EntityBuilder<T: BuildTerms + Sized> {
builder: T,
entity: KnownEntidOr<TempIdHandle>,
}
pub trait BuildTerms where Self: Sized {
fn describe_tempid(self, name: &str) -> EntityBuilder<Self>;
fn describe<E>(self, entity: E) -> EntityBuilder<Self> where E: IntoThing<KnownEntidOr<TempIdHandle>>;
fn add<E, V>(&mut self, e: E, a: KnownEntid, v: V) -> Result<()>
where E: IntoThing<KnownEntidOr<TempIdHandle>>,
V: IntoThing<TypedValueOr<TempIdHandle>>;
fn retract<E, V>(&mut self, e: E, a: KnownEntid, v: V) -> Result<()>
where E: IntoThing<KnownEntidOr<TempIdHandle>>,
V: IntoThing<TypedValueOr<TempIdHandle>>;
}
impl BuildTerms for TermBuilder {
fn describe_tempid(mut self, name: &str) -> EntityBuilder<Self> {
let e = self.named_tempid(name.into());
self.describe(e)
}
fn describe<E>(self, entity: E) -> EntityBuilder<Self> where E: IntoThing<KnownEntidOr<TempIdHandle>> {
EntityBuilder {
builder: self,
entity: entity.into_thing(),
}
}
fn add<E, V>(&mut self, e: E, a: KnownEntid, v: V) -> Result<()>
where E: IntoThing<KnownEntidOr<TempIdHandle>>,
V: IntoThing<TypedValueOr<TempIdHandle>> {
let e = e.into_thing();
let v = v.into_thing();
self.terms.push(Term::AddOrRetract(OpType::Add, e, a.into(), v));
Ok(())
}
fn retract<E, V>(&mut self, e: E, a: KnownEntid, v: V) -> Result<()>
where E: IntoThing<KnownEntidOr<TempIdHandle>>,
V: IntoThing<TypedValueOr<TempIdHandle>> {
let e = e.into_thing();
let v = v.into_thing();
self.terms.push(Term::AddOrRetract(OpType::Retract, e, a.into(), v));
Ok(())
}
}
impl TermBuilder {
pub fn build(self) -> Result<Terms> {
Ok((self.terms, self.tempids))
}
pub fn new() -> TermBuilder {
TermBuilder {
tempids: InternSet::new(),
terms: vec![],
}
}
pub fn named_tempid(&mut self, name: String) -> TempIdHandle {
self.tempids.intern(TempId::External(name))
}
#[allow(dead_code)]
pub fn numbered_tempid(&mut self, id: i64) -> TempIdHandle {
self.tempids.intern(TempId::Internal(id))
}
}
impl<T> EntityBuilder<T> where T: BuildTerms {
pub fn finish(self) -> (T, KnownEntidOr<TempIdHandle>) {
(self.builder, self.entity)
}
pub fn add<V>(&mut self, a: KnownEntid, v: V) -> Result<()>
where V: IntoThing<TypedValueOr<TempIdHandle>> {
self.builder.add(self.entity.clone(), a, v)
}
}
pub struct InProgressBuilder<'a, 'c> {
in_progress: InProgress<'a, 'c>,
builder: TermBuilder,
}
impl<'a, 'c> InProgressBuilder<'a, 'c> {
pub fn new(in_progress: InProgress<'a, 'c>) -> Self {
InProgressBuilder {
in_progress: in_progress,
builder: TermBuilder::new(),
}
}
/// Build the terms from this builder and transact them against the current
/// `InProgress`. This method _always_ returns the `InProgress` -- failure doesn't
/// imply an automatic rollback.
pub fn transact(self) -> (InProgress<'a, 'c>, Result<TxReport>) {
let mut in_progress = self.in_progress;
let result = self.builder
.build()
.and_then(|(terms, tempid_set)| {
in_progress.transact_terms(terms, tempid_set)
});
(in_progress, result)
}
/// Transact the contents of the builder and commit the `InProgress`. If any
/// step fails, roll back. Return the `TxReport`.
pub fn commit(self) -> Result<TxReport> {
let mut in_progress = self.in_progress;
self.builder
.build()
.and_then(|(terms, tempid_set)| {
in_progress.transact_terms(terms, tempid_set)
.and_then(|report| {
in_progress.commit()?;
Ok(report)
})
})
}
}
impl<'a, 'c> BuildTerms for InProgressBuilder<'a, 'c> {
fn describe_tempid(mut self, name: &str) -> EntityBuilder<InProgressBuilder<'a, 'c>> {
let e = self.builder.named_tempid(name.into());
self.describe(e)
}
fn describe<E>(self, entity: E) -> EntityBuilder<InProgressBuilder<'a, 'c>> where E: IntoThing<KnownEntidOr<TempIdHandle>> {
EntityBuilder {
builder: self,
entity: entity.into_thing(),
}
}
fn add<E, V>(&mut self, e: E, a: KnownEntid, v: V) -> Result<()>
where E: IntoThing<KnownEntidOr<TempIdHandle>>,
V: IntoThing<TypedValueOr<TempIdHandle>> {
self.builder.add(e, a, v)
}
fn retract<E, V>(&mut self, e: E, a: KnownEntid, v: V) -> Result<()>
where E: IntoThing<KnownEntidOr<TempIdHandle>>,
V: IntoThing<TypedValueOr<TempIdHandle>> {
self.builder.retract(e, a, v)
}
}
impl<'a, 'c> EntityBuilder<InProgressBuilder<'a, 'c>> {
/// Build the terms from this builder and transact them against the current
/// `InProgress`. This method _always_ returns the `InProgress` -- failure doesn't
/// imply an automatic rollback.
pub fn transact(self) -> (InProgress<'a, 'c>, Result<TxReport>) {
self.finish().0.transact()
}
/// Transact the contents of the builder and commit the `InProgress`. If any
/// step fails, roll back. Return the `TxReport`.
pub fn commit(self) -> Result<TxReport> {
self.finish().0.commit()
}
}
// Can't implement Into for Rc<T>.
pub trait IntoThing<T>: Sized {
fn into_thing(self) -> T;
}
pub trait FromThing<T> {
fn from_thing(v: T) -> Self;
}
impl<T> FromThing<T> for T {
fn from_thing(v: T) -> T {
v
}
}
impl<I, F> IntoThing<I> for F where I: FromThing<F> {
fn into_thing(self) -> I {
I::from_thing(self)
}
}
impl<'a> FromThing<&'a TempIdHandle> for TypedValueOr<TempIdHandle> {
fn from_thing(v: &'a TempIdHandle) -> Self {
Either::Right(v.clone())
}
}
impl FromThing<TempIdHandle> for TypedValueOr<TempIdHandle> {
fn from_thing(v: TempIdHandle) -> Self {
Either::Right(v)
}
}
impl FromThing<TypedValue> for TypedValueOr<TempIdHandle> {
fn from_thing(v: TypedValue) -> Self {
Either::Left(v)
}
}
impl FromThing<TempIdHandle> for KnownEntidOr<TempIdHandle> {
fn from_thing(v: TempIdHandle) -> Self {
Either::Right(v)
}
}
impl<'a> FromThing<&'a KnownEntid> for KnownEntidOr<TempIdHandle> {
fn from_thing(v: &'a KnownEntid) -> Self {
Either::Left(v.clone())
}
}
impl FromThing<KnownEntid> for KnownEntidOr<TempIdHandle> {
fn from_thing(v: KnownEntid) -> Self {
Either::Left(v)
}
}
impl FromThing<KnownEntid> for TypedValueOr<TempIdHandle> {
fn from_thing(v: KnownEntid) -> Self {
Either::Left(v.into())
}
}
#[cfg(test)]
mod testing {
extern crate mentat_db;
use mentat_core::{
Entid,
HasSchema,
NamespacedKeyword,
TypedValue,
};
use errors::{
Error,
};
use errors::ErrorKind::{
DbError,
};
use mentat_db::TxReport;
use mentat_db::ErrorKind::{
UnrecognizedEntid,
};
use ::{
Conn,
Queryable,
};
use super::*;
// In reality we expect the store to hand these out safely.
fn fake_known_entid(e: Entid) -> KnownEntid {
KnownEntid(e)
}
#[test]
fn test_entity_builder_bogus_entids() {
let mut builder = TermBuilder::new();
let e = builder.named_tempid("x".into());
let a1 = fake_known_entid(37); // :db/doc
let a2 = fake_known_entid(999);
let v = TypedValue::typed_string("Some attribute");
let ve = fake_known_entid(12345);
builder.add(e.clone(), a1, v).expect("add succeeded");
builder.add(e.clone(), a2, e.clone()).expect("add succeeded, even though it's meaningless");
builder.add(e.clone(), a2, ve).expect("add succeeded, even though it's meaningless");
let (terms, tempids) = builder.build().expect("build succeeded");
assert_eq!(tempids.len(), 1);
assert_eq!(terms.len(), 3); // TODO: check the contents?
// Now try to add them to a real store.
let mut sqlite = mentat_db::db::new_connection("").unwrap();
let mut conn = Conn::connect(&mut sqlite).unwrap();
let mut in_progress = conn.begin_transaction(&mut sqlite).expect("begun successfully");
// This should fail: unrecognized entid.
if let Err(Error(DbError(UnrecognizedEntid(e)), _)) = in_progress.transact_terms(terms, tempids) {
assert_eq!(e, 999);
} else {
panic!("Should have rejected the entid.");
}
}
#[test]
fn test_entity_builder() {
let mut sqlite = mentat_db::db::new_connection("").unwrap();
let mut conn = Conn::connect(&mut sqlite).unwrap();
let foo_one = NamespacedKeyword::new("foo", "one");
let foo_many = NamespacedKeyword::new("foo", "many");
let foo_ref = NamespacedKeyword::new("foo", "ref");
let report: TxReport;
// Give ourselves a schema to work with!
// Scoped borrow of conn.
{
conn.transact(&mut sqlite, r#"[
[:db/add "o" :db/ident :foo/one]
[:db/add "o" :db/valueType :db.type/long]
[:db/add "o" :db/cardinality :db.cardinality/one]
[:db/add "m" :db/ident :foo/many]
[:db/add "m" :db/valueType :db.type/string]
[:db/add "m" :db/cardinality :db.cardinality/many]
[:db/add "r" :db/ident :foo/ref]
[:db/add "r" :db/valueType :db.type/ref]
[:db/add "r" :db/cardinality :db.cardinality/one]
]"#).unwrap();
let mut in_progress = conn.begin_transaction(&mut sqlite).expect("begun successfully");
// Scoped borrow of in_progress.
{
let mut builder = TermBuilder::new();
let e_x = builder.named_tempid("x".into());
let e_y = builder.named_tempid("y".into());
let a_ref = in_progress.get_entid(&foo_ref).expect(":foo/ref");
let a_one = in_progress.get_entid(&foo_one).expect(":foo/one");
let a_many = in_progress.get_entid(&foo_many).expect(":foo/many");
let v_many_1 = TypedValue::typed_string("Some text");
let v_many_2 = TypedValue::typed_string("Other text");
let v_long: TypedValue = 123.into();
builder.add(e_x.clone(), a_many, v_many_1).expect("add succeeded");
builder.add(e_x.clone(), a_many, v_many_2).expect("add succeeded");
builder.add(e_y.clone(), a_ref, e_x.clone()).expect("add succeeded");
builder.add(e_x.clone(), a_one, v_long).expect("add succeeded");
let (terms, tempids) = builder.build().expect("build succeeded");
assert_eq!(tempids.len(), 2);
assert_eq!(terms.len(), 4);
report = in_progress.transact_terms(terms, tempids).expect("add succeeded");
let x = report.tempids.get("x").expect("our tempid has an ID");
let y = report.tempids.get("y").expect("our tempid has an ID");
assert_eq!(in_progress.lookup_value_for_attribute(*y, &foo_ref).expect("lookup succeeded"),
Some(TypedValue::Ref(*x)));
assert_eq!(in_progress.lookup_value_for_attribute(*x, &foo_one).expect("lookup succeeded"),
Some(TypedValue::Long(123)));
}
in_progress.commit().expect("commit succeeded");
}
// It's all still there after the commit.
let x = report.tempids.get("x").expect("our tempid has an ID");
let y = report.tempids.get("y").expect("our tempid has an ID");
assert_eq!(conn.lookup_value_for_attribute(&mut sqlite, *y, &foo_ref).expect("lookup succeeded"),
Some(TypedValue::Ref(*x)));
}
}

9
src/errors.rs
View file

@ -15,7 +15,11 @@ use rusqlite;
use std::collections::BTreeSet;
use edn;
use mentat_core::{
Attribute,
};
use mentat_db;
use mentat_query;
use mentat_query_algebrizer;
use mentat_query_parser;
use mentat_query_projector;
@ -63,5 +67,10 @@ error_chain! {
description("invalid vocabulary version")
display("invalid vocabulary version")
}
ConflictingAttributeDefinitions(vocabulary: String, version: ::vocabulary::Version, attribute: String, current: Attribute, requested: Attribute) {
description("conflicting attribute definitions")
display("vocabulary {}/{} already has attribute {}, and the requested definition differs", vocabulary, version, attribute)
}
}
}

9
src/lib.rs
View file

@ -13,6 +13,9 @@
#[macro_use]
extern crate error_chain;
#[macro_use]
extern crate lazy_static;
extern crate rusqlite;
extern crate edn;
@ -33,6 +36,7 @@ pub mod errors;
pub mod ident;
pub mod conn;
pub mod query;
pub mod entity_builder;
pub fn get_name() -> String {
return String::from("mentat");
@ -44,12 +48,16 @@ pub fn get_connection() -> Connection {
}
pub use mentat_core::{
Attribute,
Entid,
TypedValue,
Uuid,
ValueType,
};
pub use mentat_db::{
CORE_SCHEMA_VERSION,
DB_SCHEMA_CORE,
new_connection,
};
@ -67,6 +75,7 @@ pub use query::{
pub use conn::{
Conn,
InProgress,
Metadata,
Queryable,
};