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[tx] Fail transactions where complex upserts resolve to multiple entids. (#670) r=rnewman

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This commit is contained in:
Nick Alexander 2018-05-01 15:35:44 -07:00
commit 9513012aa5
8 changed files with 189 additions and 39 deletions
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4
db/Cargo.toml
View file

@ -8,6 +8,7 @@ error-chain = { git = "https://github.com/rnewman/error-chain", branch = "rnewma
indexmap = "1"
itertools = "0.7"
lazy_static = "0.2"
log = "0.4"
num = "0.1"
ordered-float = "0.5"
time = "0.1"
@ -31,3 +32,6 @@ path = "../tx-parser"
# Should be dev-dependencies.
[dependencies.tabwriter]
version = "1.0.3"
[dev-dependencies]
env_logger = "0.5"

62
db/src/db.rs
View file

@ -1568,7 +1568,15 @@ mod tests {
// Conflicting upserts fail.
assert_transact!(conn, "[[:db/add \"t1\" :db/ident :name/Ivan]
[:db/add \"t1\" :db/ident :name/Petr]]",
Err("not yet implemented: Conflicting upsert: tempid \'t1\' resolves to more than one entid: 100, 101"));
Err("schema constraint violation: conflicting upserts:\n tempid External(\"t1\") upserts to {KnownEntid(100), KnownEntid(101)}\n"));
// The error messages of conflicting upserts gives information about all failing upserts (in a particular generation).
assert_transact!(conn, "[[:db/add \"t2\" :db/ident :name/Grigory]
[:db/add \"t2\" :db/ident :name/Petr]
[:db/add \"t2\" :db/ident :name/Ivan]
[:db/add \"t1\" :db/ident :name/Ivan]
[:db/add \"t1\" :db/ident :name/Petr]]",
Err("schema constraint violation: conflicting upserts:\n tempid External(\"t1\") upserts to {KnownEntid(100), KnownEntid(101)}\n tempid External(\"t2\") upserts to {KnownEntid(100), KnownEntid(101)}\n"));
// tempids in :db/retract that don't upsert fail.
assert_transact!(conn, "[[:db/retract \"t1\" :db/ident :name/Anonymous]]",
@ -2448,4 +2456,56 @@ mod tests {
]"#,
Err("Could not insert non-fts one statements into temporary search table!"));
}
#[test]
fn test_conflicting_upserts() {
let mut conn = TestConn::default();
assert_transact!(conn, r#"[
{:db/ident :page/id :db/valueType :db.type/string :db/index true :db/unique :db.unique/identity}
{:db/ident :page/ref :db/valueType :db.type/ref :db/index true :db/unique :db.unique/identity}
{:db/ident :page/title :db/valueType :db.type/string :db/cardinality :db.cardinality/many}
]"#);
// Let's test some conflicting upserts. First, valid data to work with -- note self references.
assert_transact!(conn, r#"[
[:db/add 111 :page/id "1"]
[:db/add 111 :page/ref 111]
[:db/add 222 :page/id "2"]
[:db/add 222 :page/ref 222]
]"#);
// Now valid upserts. Note the references are valid.
let report = assert_transact!(conn, r#"[
[:db/add "a" :page/id "1"]
[:db/add "a" :page/ref "a"]
[:db/add "b" :page/id "2"]
[:db/add "b" :page/ref "b"]
]"#);
assert_matches!(tempids(&report),
"{\"a\" 111
\"b\" 222}");
// Now conflicting upserts. Note the references are reversed. This example is interesting
// because the first round `UpsertE` instances upsert, and this resolves all of the tempids
// in the `UpsertEV` instances. However, those `UpsertEV` instances lead to conflicting
// upserts! This tests that we don't resolve too far, giving a chance for those upserts to
// fail. This error message is crossing generations, although it's not reflected in the
// error data structure.
assert_transact!(conn, r#"[
[:db/add "a" :page/id "1"]
[:db/add "a" :page/ref "b"]
[:db/add "b" :page/id "2"]
[:db/add "b" :page/ref "a"]
]"#,
Err("schema constraint violation: conflicting upserts:\n tempid External(\"a\") upserts to {KnownEntid(111), KnownEntid(222)}\n tempid External(\"b\") upserts to {KnownEntid(111), KnownEntid(222)}\n"));
// Here's a case where the upsert is not resolved, just allocated, but leads to conflicting
// cardinality one datoms.
assert_transact!(conn, r#"[
[:db/add "x" :page/ref 333]
[:db/add "x" :page/ref 444]
]"#,
Err("Could not insert non-fts one statements into temporary search table!"));
}
}

52
db/src/errors.rs
View file

@ -10,11 +10,55 @@
#![allow(dead_code)]
use std::collections::{
BTreeMap,
BTreeSet,
};
use edn;
use rusqlite;
use mentat_tx::entities::{
TempId,
};
use mentat_tx_parser;
use types::{Entid, ValueType};
use mentat_core::{
KnownEntid,
};
use types::{
Entid,
ValueType,
};
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum SchemaConstraintViolation {
/// A transaction tried to assert datoms where one tempid upserts to two (or more) distinct
/// entids.
ConflictingUpserts {
/// A map from tempid to the entids it would upsert to.
///
/// In the future, we might even be able to attribute the upserts to particular (reduced)
/// datoms, i.e., to particular `[e a v]` triples that caused the constraint violation.
/// Attributing constraint violations to input data is more difficult to the multiple
/// rewriting passes the input undergoes.
conflicting_upserts: BTreeMap<TempId, BTreeSet<KnownEntid>>,
},
}
impl ::std::fmt::Display for SchemaConstraintViolation {
fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
use self::SchemaConstraintViolation::*;
match self {
&ConflictingUpserts { ref conflicting_upserts } => {
write!(f, "conflicting upserts:\n")?;
for (tempid, entids) in conflicting_upserts {
write!(f, " tempid {:?} upserts to {:?}\n", tempid, entids)?;
}
Ok(())
},
}
}
}
error_chain! {
types {
@ -102,5 +146,11 @@ error_chain! {
description("schema alteration failed")
display("schema alteration failed: {}", t)
}
/// A transaction tried to violate a constraint of the schema of the Mentat store.
SchemaConstraintViolation(violation: SchemaConstraintViolation) {
description("schema constraint violation")
display("schema constraint violation: {}", violation)
}
}
}

11
db/src/lib.rs
View file

@ -11,21 +11,18 @@
// Oh, error_chain.
#![recursion_limit="128"]
#[macro_use]
extern crate error_chain;
#[macro_use] extern crate error_chain;
extern crate indexmap;
extern crate itertools;
#[macro_use]
extern crate lazy_static;
#[macro_use] extern crate lazy_static;
#[macro_use] extern crate log;
extern crate num;
extern crate rusqlite;
extern crate tabwriter;
extern crate time;
#[macro_use]
extern crate edn;
#[macro_use] extern crate edn;
extern crate mentat_core;
extern crate mentat_tx;
extern crate mentat_tx_parser;

82
db/src/tx.rs
View file

@ -51,6 +51,9 @@ use std::collections::{
BTreeSet,
VecDeque,
};
use std::iter::{
once,
};
use std::rc::{
Rc,
};
@ -64,7 +67,11 @@ use edn::{
NamespacedKeyword,
};
use entids;
use errors::{ErrorKind, Result};
use errors;
use errors::{
ErrorKind,
Result,
};
use internal_types::{
KnownEntidOr,
LookupRef,
@ -190,21 +197,30 @@ impl<'conn, 'a, W> Tx<'conn, 'a, W> where W: TransactWatcher {
// Lookup in the store.
let av_map: AVMap = self.store.resolve_avs(&av_pairs[..])?;
debug!("looked up avs {:?}", av_map);
// Map id->entid.
let mut temp_id_map: TempIdMap = TempIdMap::default();
for &(ref temp_id, ref av_pair) in temp_id_avs {
if let Some(n) = av_map.get(&av_pair) {
if let Some(&KnownEntid(previous_n)) = temp_id_map.get(&*temp_id) {
if *n != previous_n {
// Conflicting upsert! TODO: collect conflicts and give more details on what failed this transaction.
bail!(ErrorKind::NotYetImplemented(format!("Conflicting upsert: tempid '{}' resolves to more than one entid: {:?}, {:?}", temp_id, previous_n, n))) // XXX
let mut tempids: TempIdMap = TempIdMap::default();
// Errors. BTree* since we want deterministic results.
let mut conflicting_upserts: BTreeMap<TempId, BTreeSet<KnownEntid>> = BTreeMap::default();
for &(ref tempid, ref av_pair) in temp_id_avs {
trace!("tempid {:?} av_pair {:?} -> {:?}", tempid, av_pair, av_map.get(&av_pair));
if let Some(entid) = av_map.get(&av_pair).cloned().map(KnownEntid) {
tempids.insert(tempid.clone(), entid).map(|previous| {
if entid != previous {
conflicting_upserts.entry((**tempid).clone()).or_insert_with(|| once(previous).collect::<BTreeSet<_>>()).insert(entid);
}
}
temp_id_map.insert(temp_id.clone(), KnownEntid(*n));
});
}
}
Ok(temp_id_map)
if !conflicting_upserts.is_empty() {
bail!(ErrorKind::SchemaConstraintViolation(errors::SchemaConstraintViolation::ConflictingUpserts { conflicting_upserts }));
}
Ok(tempids)
}
/// Pipeline stage 1: convert `Entity` instances into `Term` instances, ready for term
@ -581,30 +597,46 @@ impl<'conn, 'a, W> Tx<'conn, 'a, W> where W: TransactWatcher {
// And evolve them forward.
while generation.can_evolve() {
debug!("generation {:?}", generation);
let tempid_avs = generation.temp_id_avs();
debug!("trying to resolve avs {:?}", tempid_avs);
// Evolve further.
let temp_id_map: TempIdMap = self.resolve_temp_id_avs(&generation.temp_id_avs()[..])?;
let temp_id_map: TempIdMap = self.resolve_temp_id_avs(&tempid_avs[..])?;
debug!("resolved avs for tempids {:?}", temp_id_map);
generation = generation.evolve_one_step(&temp_id_map);
// Errors. BTree* since we want deterministic results.
let mut conflicting_upserts: BTreeMap<TempId, BTreeSet<KnownEntid>> = BTreeMap::default();
// Report each tempid that resolves via upsert.
for (tempid, entid) in temp_id_map {
// Every tempid should be resolved at most once. Prima facie, we might expect a
// tempid to be resolved in two different generations. However, that is not so: the
// keys of temp_id_map are unique between generations.Suppose that id->e and id->e*
// are two such mappings, resolved on subsequent evolutionary steps, and that `id`
// is a key in the intersection of the two key sets. This can't happen: if `id` maps
// to `e` via id->e, all instances of `id` have been evolved forward (replaced with
// `e`) before we try to resolve the next set of `UpsertsE`. That is, we'll never
// successfully upsert the same tempid in more than one generation step. (We might
// upsert the same tempid to multiple entids via distinct `[a v]` pairs in a single
// generation step; in this case, the transaction will fail.)
let previous = tempids.insert((*tempid).clone(), entid);
assert!(previous.is_none());
// Since `UpsertEV` instances always transition to `UpsertE` instances, it might be
// that a tempid resolves in two generations, and those resolutions might conflict.
tempids.insert((*tempid).clone(), entid).map(|previous| {
if entid != previous {
conflicting_upserts.entry((*tempid).clone()).or_insert_with(|| once(previous).collect::<BTreeSet<_>>()).insert(entid);
}
});
}
if !conflicting_upserts.is_empty() {
bail!(ErrorKind::SchemaConstraintViolation(errors::SchemaConstraintViolation::ConflictingUpserts { conflicting_upserts }));
}
debug!("tempids {:?}", tempids);
}
debug!("final generation {:?}", generation);
// Allocate entids for tempids that didn't upsert. BTreeSet rather than HashSet so this is deterministic.
let unresolved_temp_ids: BTreeSet<TempIdHandle> = generation.temp_ids_in_allocations();
debug!("unresolved tempids {:?}", unresolved_temp_ids);
// TODO: track partitions for temporary IDs.
let entids = self.partition_map.allocate_entids(":db.part/user", unresolved_temp_ids.len());
@ -612,6 +644,8 @@ impl<'conn, 'a, W> Tx<'conn, 'a, W> where W: TransactWatcher {
.zip(entids.map(|e| KnownEntid(e)))
.collect();
debug!("tempid allocations {:?}", temp_id_allocations);
let final_populations = generation.into_final_populations(&temp_id_allocations)?;
// Report each tempid that is allocated.

7
db/src/upsert_resolution.rs
View file

@ -155,7 +155,12 @@ impl Generation {
for UpsertEV(t1, a, t2) in self.upserts_ev {
match (temp_id_map.get(&*t1), temp_id_map.get(&*t2)) {
(Some(&n1), Some(&n2)) => next.resolved.push(Term::AddOrRetract(OpType::Add, n1, a, TypedValue::Ref(n2.0))),
(Some(_), Some(&n2)) => {
// Even though we can resolve entirely, it's possible that the remaining upsert
// could conflict. Moving straight to resolved doesn't give us a chance to
// search the store for the conflict.
next.upserts_e.push(UpsertE(t1, a, TypedValue::Ref(n2.0)))
},
(None, Some(&n2)) => next.upserts_e.push(UpsertE(t1, a, TypedValue::Ref(n2.0))),
(Some(&n1), None) => next.allocations.push(Term::AddOrRetract(OpType::Add, Left(n1), a, Right(t2))),
(None, None) => next.allocations.push(Term::AddOrRetract(OpType::Add, Right(t1), a, Right(t2))),

4
src/conn.rs
View file

@ -1175,8 +1175,8 @@ mod tests {
let report = conn.transact(&mut sqlite, "[[:db/add \"u\" :db/ident :a/keyword]
[:db/add \"u\" :db/ident :b/keyword]]");
match report.unwrap_err() {
Error(ErrorKind::DbError(::mentat_db::errors::ErrorKind::NotYetImplemented(_)), _) => { },
x => panic!("expected EDN parse error, got {:?}", x),
Error(ErrorKind::DbError(::mentat_db::errors::ErrorKind::SchemaConstraintViolation(_)), _) => { },
x => panic!("expected schema constraint violation, got {:?}", x),
}
}

4
tools/cli/Cargo.toml
View file

@ -13,11 +13,11 @@ test = false
[dependencies]
combine = "2.2.2"
env_logger = "0.3"
env_logger = "0.5"
getopts = "0.2"
lazy_static = "0.2"
linefeed = "0.4"
log = "0.3"
log = "0.4"
tabwriter = "1"
tempfile = "1.1"
termion = "1"