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Don't use more than 999 variables in SQLite querys. (#1425)

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* Don't use more than 999 variables in SQLite querys.

Solve this problem in a more general and reusable way.
Also fix #1369
Add some unit tests.

Signed-off-by: Henrik Sölver <henrik.solver@gmail.com>

* Don't rely on testify for basic assertions

* Readability improvements and linting

Co-authored-by: Henrik Sölver <henrik.solver@gmail.com>
This commit is contained in:
Kegsay 2020-09-14 16:39:38 +01:00 committed by GitHub
parent 913020e4b7
commit 8dc9506210
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 255 additions and 33 deletions
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1
go.mod
View File

@ -1,6 +1,7 @@
module github.com/matrix-org/dendrite
require (
github.com/DATA-DOG/go-sqlmock v1.5.0
github.com/Shopify/sarama v1.27.0
github.com/codahale/hdrhistogram v0.0.0-20161010025455-3a0bb77429bd // indirect
github.com/gologme/log v1.2.0

2
go.sum
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@ -13,6 +13,8 @@ github.com/Arceliar/phony v0.0.0-20191006174943-d0c68492aca0 h1:p3puK8Sl2xK+2Fnn
github.com/Arceliar/phony v0.0.0-20191006174943-d0c68492aca0/go.mod h1:6Lkn+/zJilRMsKmbmG1RPoamiArC6HS73xbwRyp3UyI=
github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/DATA-DOG/go-sqlmock v1.5.0 h1:Shsta01QNfFxHCfpW6YH2STWB0MudeXXEWMr20OEh60=
github.com/DATA-DOG/go-sqlmock v1.5.0/go.mod h1:f/Ixk793poVmq4qj/V1dPUg2JEAKC73Q5eFN3EC/SaM=
github.com/Kubuxu/go-os-helper v0.0.1/go.mod h1:N8B+I7vPCT80IcP58r50u4+gEEcsZETFUpAzWW2ep1Y=
github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
github.com/PuerkitoBio/goquery v1.5.1/go.mod h1:GsLWisAFVj4WgDibEWF4pvYnkVQBpKBKeU+7zCJoLcc=

45
internal/sqlutil/sql.go
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@ -15,10 +15,14 @@
package sqlutil
import (
"context"
"database/sql"
"errors"
"fmt"
"runtime"
"strings"
"github.com/matrix-org/util"
)
// ErrUserExists is returned if a username already exists in the database.
@ -107,3 +111,44 @@ func SQLiteDriverName() string {
}
return "sqlite3"
}
func minOfInts(a, b int) int {
if a <= b {
return a
}
return b
}
// QueryProvider defines the interface for querys used by RunLimitedVariablesQuery.
type QueryProvider interface {
QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error)
}
// SQLite3MaxVariables is the default maximum number of host parameters in a single SQL statement
// SQLlite can handle. See https://www.sqlite.org/limits.html for more information.
const SQLite3MaxVariables = 999
// RunLimitedVariablesQuery split up a query with more variables than the used database can handle in multiple queries.
func RunLimitedVariablesQuery(ctx context.Context, query string, qp QueryProvider, variables []interface{}, limit uint, rowHandler func(*sql.Rows) error) error {
var start int
for start < len(variables) {
n := minOfInts(len(variables)-start, int(limit))
nextQuery := strings.Replace(query, "($1)", QueryVariadic(n), 1)
rows, err := qp.QueryContext(ctx, nextQuery, variables[start:start+n]...)
if err != nil {
util.GetLogger(ctx).WithError(err).Error("QueryContext returned an error")
return err
}
err = rowHandler(rows)
if closeErr := rows.Close(); closeErr != nil {
util.GetLogger(ctx).WithError(closeErr).Error("RunLimitedVariablesQuery: failed to close rows")
return err
}
if err != nil {
util.GetLogger(ctx).WithError(err).Error("RunLimitedVariablesQuery: rowHandler returned error")
return err
}
start = start + n
}
return nil
}

173
internal/sqlutil/sqlutil_test.go Normal file
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@ -0,0 +1,173 @@
package sqlutil
import (
"context"
"database/sql"
"reflect"
"testing"
sqlmock "github.com/DATA-DOG/go-sqlmock"
)
func TestShouldReturnCorrectAmountOfResulstIfFewerVariablesThanLimit(t *testing.T) {
db, mock, err := sqlmock.New()
assertNoError(t, err, "Failed to make DB")
limit := uint(4)
r := mock.NewRows([]string{"id"}).
AddRow(1).
AddRow(2).
AddRow(3)
mock.ExpectQuery(`SELECT id WHERE id IN \(\$1, \$2, \$3\)`).WillReturnRows(r)
// nolint:goconst
q := "SELECT id WHERE id IN ($1)"
v := []int{1, 2, 3}
iKeyIDs := make([]interface{}, len(v))
for i, d := range v {
iKeyIDs[i] = d
}
ctx := context.Background()
var result = make([]int, 0)
err = RunLimitedVariablesQuery(ctx, q, db, iKeyIDs, limit, func(rows *sql.Rows) error {
for rows.Next() {
var id int
err = rows.Scan(&id)
assertNoError(t, err, "rows.Scan returned an error")
result = append(result, id)
}
return nil
})
assertNoError(t, err, "Call returned an error")
if len(result) != len(v) {
t.Fatalf("Result should be 3 long")
}
}
func TestShouldReturnCorrectAmountOfResulstIfEqualVariablesAsLimit(t *testing.T) {
db, mock, err := sqlmock.New()
assertNoError(t, err, "Failed to make DB")
limit := uint(4)
r := mock.NewRows([]string{"id"}).
AddRow(1).
AddRow(2).
AddRow(3).
AddRow(4)
mock.ExpectQuery(`SELECT id WHERE id IN \(\$1, \$2, \$3, \$4\)`).WillReturnRows(r)
// nolint:goconst
q := "SELECT id WHERE id IN ($1)"
v := []int{1, 2, 3, 4}
iKeyIDs := make([]interface{}, len(v))
for i, d := range v {
iKeyIDs[i] = d
}
ctx := context.Background()
var result = make([]int, 0)
err = RunLimitedVariablesQuery(ctx, q, db, iKeyIDs, limit, func(rows *sql.Rows) error {
for rows.Next() {
var id int
err = rows.Scan(&id)
assertNoError(t, err, "rows.Scan returned an error")
result = append(result, id)
}
return nil
})
assertNoError(t, err, "Call returned an error")
if len(result) != len(v) {
t.Fatalf("Result should be 4 long")
}
}
func TestShouldReturnCorrectAmountOfResultsIfMoreVariablesThanLimit(t *testing.T) {
db, mock, err := sqlmock.New()
assertNoError(t, err, "Failed to make DB")
limit := uint(4)
r1 := mock.NewRows([]string{"id"}).
AddRow(1).
AddRow(2).
AddRow(3).
AddRow(4)
r2 := mock.NewRows([]string{"id"}).
AddRow(5)
mock.ExpectQuery(`SELECT id WHERE id IN \(\$1, \$2, \$3, \$4\)`).WillReturnRows(r1)
mock.ExpectQuery(`SELECT id WHERE id IN \(\$1\)`).WillReturnRows(r2)
// nolint:goconst
q := "SELECT id WHERE id IN ($1)"
v := []int{1, 2, 3, 4, 5}
iKeyIDs := make([]interface{}, len(v))
for i, d := range v {
iKeyIDs[i] = d
}
ctx := context.Background()
var result = make([]int, 0)
err = RunLimitedVariablesQuery(ctx, q, db, iKeyIDs, limit, func(rows *sql.Rows) error {
for rows.Next() {
var id int
err = rows.Scan(&id)
assertNoError(t, err, "rows.Scan returned an error")
result = append(result, id)
}
return nil
})
assertNoError(t, err, "Call returned an error")
if len(result) != len(v) {
t.Fatalf("Result should be 5 long")
}
if !reflect.DeepEqual(v, result) {
t.Fatalf("Result is not as expected: got %v want %v", v, result)
}
}
func TestShouldReturnErrorIfRowsScanReturnsError(t *testing.T) {
db, mock, err := sqlmock.New()
assertNoError(t, err, "Failed to make DB")
limit := uint(4)
// adding a string ID should result in rows.Scan returning an error
r := mock.NewRows([]string{"id"}).
AddRow("hej").
AddRow(2).
AddRow(3)
mock.ExpectQuery(`SELECT id WHERE id IN \(\$1, \$2, \$3\)`).WillReturnRows(r)
// nolint:goconst
q := "SELECT id WHERE id IN ($1)"
v := []int{-1, -2, 3}
iKeyIDs := make([]interface{}, len(v))
for i, d := range v {
iKeyIDs[i] = d
}
ctx := context.Background()
var result = make([]uint, 0)
err = RunLimitedVariablesQuery(ctx, q, db, iKeyIDs, limit, func(rows *sql.Rows) error {
for rows.Next() {
var id uint
err = rows.Scan(&id)
if err != nil {
return err
}
result = append(result, id)
}
return nil
})
if err == nil {
t.Fatalf("Call did not return an error")
}
}
func assertNoError(t *testing.T, err error, msg string) {
t.Helper()
if err == nil {
return
}
t.Fatalf(msg)
}

33
serverkeyapi/storage/sqlite3/server_key_table.go
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@ -18,9 +18,8 @@ package sqlite3
import (
"context"
"database/sql"
"strings"
"fmt"
"github.com/matrix-org/dendrite/internal"
"github.com/matrix-org/dendrite/internal/sqlutil"
"github.com/matrix-org/gomatrixserverlib"
)
@ -88,41 +87,36 @@ func (s *serverKeyStatements) bulkSelectServerKeys(
ctx context.Context,
requests map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.Timestamp,
) (map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.PublicKeyLookupResult, error) {
var nameAndKeyIDs []string
nameAndKeyIDs := make([]string, 0, len(requests))
for request := range requests {
nameAndKeyIDs = append(nameAndKeyIDs, nameAndKeyID(request))
}
query := strings.Replace(bulkSelectServerKeysSQL, "($1)", sqlutil.QueryVariadic(len(nameAndKeyIDs)), 1)
results := make(map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.PublicKeyLookupResult, len(requests))
iKeyIDs := make([]interface{}, len(nameAndKeyIDs))
for i, v := range nameAndKeyIDs {
iKeyIDs[i] = v
}
rows, err := s.db.QueryContext(ctx, query, iKeyIDs...)
if err != nil {
return nil, err
}
defer internal.CloseAndLogIfError(ctx, rows, "bulkSelectServerKeys: rows.close() failed")
results := map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.PublicKeyLookupResult{}
err := sqlutil.RunLimitedVariablesQuery(
ctx, bulkSelectServerKeysSQL, s.db, iKeyIDs, sqlutil.SQLite3MaxVariables,
func(rows *sql.Rows) error {
for rows.Next() {
var serverName string
var keyID string
var key string
var validUntilTS int64
var expiredTS int64
if err = rows.Scan(&serverName, &keyID, &validUntilTS, &expiredTS, &key); err != nil {
return nil, err
if err := rows.Scan(&serverName, &keyID, &validUntilTS, &expiredTS, &key); err != nil {
return fmt.Errorf("bulkSelectServerKeys: %v", err)
}
r := gomatrixserverlib.PublicKeyLookupRequest{
ServerName: gomatrixserverlib.ServerName(serverName),
KeyID: gomatrixserverlib.KeyID(keyID),
}
vk := gomatrixserverlib.VerifyKey{}
err = vk.Key.Decode(key)
err := vk.Key.Decode(key)
if err != nil {
return nil, err
return fmt.Errorf("bulkSelectServerKeys: %v", err)
}
results[r] = gomatrixserverlib.PublicKeyLookupResult{
VerifyKey: vk,
@ -130,6 +124,13 @@ func (s *serverKeyStatements) bulkSelectServerKeys(
ExpiredTS: gomatrixserverlib.Timestamp(expiredTS),
}
}
return nil
},
)
if err != nil {
return nil, err
}
return results, nil
}