forked from TrueCloudLab/frostfs-node
[#23] Support SQL-like queries for placement
JSON format is rather verbose an inconvenient to be edited by hand. This commit implements SQL-like language for representing placement policy. Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
This commit is contained in:
Alex Vanin
parent
246a15de35
commit
001a23eb31
7 changed files with 526 additions and 0 deletions
1
go.mod
1
go.mod
|
|
@ -4,6 +4,7 @@ go 1.14
|
|||
|
||||
require (
|
||||
bou.ke/monkey v1.0.2
|
||||
github.com/alecthomas/participle v0.6.0
|
||||
github.com/golang/protobuf v1.4.2
|
||||
github.com/google/uuid v1.1.1
|
||||
github.com/mitchellh/go-homedir v1.1.0
|
||||
|
|
|
|||
BIN
go.sum
BIN
go.sum
Binary file not shown.
20
pkg/policy/doc.go
Normal file
20
pkg/policy/doc.go
Normal file
|
|
@ -0,0 +1,20 @@
|
|||
// Package policy provides facilities for creating policy from SQL-like language.
|
||||
// eBNF grammar is provided in `grammar.ebnf` for illustration.
|
||||
//
|
||||
// Current limitations:
|
||||
// 1. Grouping filter expressions in parenthesis is not supported right now.
|
||||
// Requiring this will make query too verbose, making it optional makes
|
||||
// our grammar not LL(1). This can be supported in future.
|
||||
// 2. Filters must be defined before they are used.
|
||||
// This requirement may be relaxed in future.
|
||||
//
|
||||
// Example query:
|
||||
// REP 1 in SPB
|
||||
// REP 2 in Americas
|
||||
// CBF 4
|
||||
// SELECT 1 Node IN City FROM SPBSSD AS SPB
|
||||
// SELECT 2 Node IN SAME City FROM Americas AS Americas
|
||||
// FILTER SSD EQ true AS IsSSD
|
||||
// FILTER @IsSSD AND Country eq "RU" AND City eq "St.Petersburg" AS SPBSSD
|
||||
// FILTER 'Continent' == 'North America' OR Continent == 'South America' AS Americas
|
||||
package policy
|
||||
52
pkg/policy/grammar.ebnf
Normal file
52
pkg/policy/grammar.ebnf
Normal file
|
|
@ -0,0 +1,52 @@
|
|||
Policy ::=
|
||||
RepStmt, [RepStmt],
|
||||
CbtStmt?,
|
||||
[SelectStmt],
|
||||
[FilterStmt],
|
||||
;
|
||||
|
||||
RepStmt ::=
|
||||
'REP', Number1, (* number of object replicas *)
|
||||
('AS', Ident)? (* optional selector name *)
|
||||
;
|
||||
|
||||
CbtStmt ::= 'CBF', Number1 (* container backup factor *)
|
||||
;
|
||||
|
||||
SelectStmt ::=
|
||||
'SELECT', Number1, (* number of nodes to select without container backup factor *)
|
||||
'IN', Clause?, Ident, (* bucket name *)
|
||||
FROM, (Ident | '*'), (* filter reference or whole netmap *)
|
||||
('AS', Ident)? (* optional selector name *)
|
||||
;
|
||||
|
||||
Clause ::=
|
||||
'SAME' (* nodes from the same bucket *)
|
||||
| 'DISTINCT' (* nodes from distinct buckets *)
|
||||
;
|
||||
|
||||
FilterStmt ::=
|
||||
'FILTER', AndChain, ['OR', AndChain],
|
||||
'AS', Ident (* obligatory filter name *)
|
||||
;
|
||||
|
||||
AndChain ::=
|
||||
Expr, ['AND', Expr]
|
||||
;
|
||||
|
||||
Expr ::=
|
||||
'@' Ident (* filter reference *)
|
||||
| Ident, Op, Value (* attribute filter *)
|
||||
;
|
||||
|
||||
Op ::= 'EQ' | 'NE' | 'GE' | 'GT' | 'LT' | 'LE'
|
||||
;
|
||||
|
||||
Value ::= Ident | Number | String
|
||||
;
|
||||
|
||||
Number1 ::= Digit1 [Digit];
|
||||
Number ::= Digit [Digit];
|
||||
|
||||
Digit1 ::= '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9' ;
|
||||
Digit ::= '0' | Digit1;
|
||||
60
pkg/policy/grammar.go
Normal file
60
pkg/policy/grammar.go
Normal file
|
|
@ -0,0 +1,60 @@
|
|||
package policy
|
||||
|
||||
import (
|
||||
"github.com/alecthomas/participle"
|
||||
)
|
||||
|
||||
var parser *participle.Parser
|
||||
|
||||
func init() {
|
||||
p, err := participle.Build(&query{})
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
parser = p
|
||||
}
|
||||
|
||||
type query struct {
|
||||
Replicas []*replicaStmt `@@+`
|
||||
CBF uint32 `("CBF" @Int)?`
|
||||
Selectors []*selectorStmt `@@*`
|
||||
Filters []*filterStmt `@@*`
|
||||
}
|
||||
|
||||
type replicaStmt struct {
|
||||
Count int `"REP" @Int`
|
||||
Selector string `("IN" @Ident)?`
|
||||
}
|
||||
|
||||
type selectorStmt struct {
|
||||
Count uint32 `"SELECT" @Int`
|
||||
Clause string `"IN" @("SAME" | "DISTINCT")?`
|
||||
Bucket string `@Ident`
|
||||
Filter string `"FROM" @(Ident | "*")`
|
||||
Name string `("AS" @Ident)?`
|
||||
}
|
||||
|
||||
type filterStmt struct {
|
||||
Value *orChain `"FILTER" @@`
|
||||
Name string `"AS" @Ident`
|
||||
}
|
||||
|
||||
type filterOrExpr struct {
|
||||
Reference string `"@"@Ident`
|
||||
Expr *simpleExpr `| @@`
|
||||
}
|
||||
|
||||
type orChain struct {
|
||||
Clauses []*andChain `@@ ("OR" @@)*`
|
||||
}
|
||||
|
||||
type andChain struct {
|
||||
Clauses []*filterOrExpr `@@ ("AND" @@)*`
|
||||
}
|
||||
|
||||
type simpleExpr struct {
|
||||
Key string `@Ident`
|
||||
// We don't use literals here to improve error messages.
|
||||
Op string `@Ident`
|
||||
Value string `@(Ident | String | Int)`
|
||||
}
|
||||
163
pkg/policy/query.go
Normal file
163
pkg/policy/query.go
Normal file
|
|
@ -0,0 +1,163 @@
|
|||
package policy
|
||||
|
||||
import (
|
||||
"errors"
|
||||
"fmt"
|
||||
"strings"
|
||||
|
||||
sdknm "github.com/nspcc-dev/neofs-api-go/pkg/netmap"
|
||||
"github.com/nspcc-dev/neofs-api-go/v2/netmap"
|
||||
)
|
||||
|
||||
var (
|
||||
ErrInvalidNumber = errors.New("policy: expected positive integer")
|
||||
ErrUnknownOp = errors.New("policy: unknown operation")
|
||||
ErrUnknownFilter = errors.New("policy: filter not found")
|
||||
ErrUnknownSelector = errors.New("policy: selector not found")
|
||||
)
|
||||
|
||||
func parse(s string) (*query, error) {
|
||||
q := new(query)
|
||||
err := parser.Parse(strings.NewReader(s), q)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return q, nil
|
||||
}
|
||||
|
||||
// Parse parses s into a placement policy.
|
||||
func Parse(s string) (*netmap.PlacementPolicy, error) {
|
||||
q, err := parse(s)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
seenFilters := map[string]bool{}
|
||||
fs := make([]*netmap.Filter, 0, len(q.Filters))
|
||||
for _, qf := range q.Filters {
|
||||
f, err := filterFromOrChain(qf.Value, seenFilters)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
f.SetName(qf.Name)
|
||||
fs = append(fs, f)
|
||||
seenFilters[qf.Name] = true
|
||||
}
|
||||
|
||||
seenSelectors := map[string]bool{}
|
||||
ss := make([]*netmap.Selector, 0, len(q.Selectors))
|
||||
for _, qs := range q.Selectors {
|
||||
if qs.Filter != sdknm.MainFilterName && !seenFilters[qs.Filter] {
|
||||
return nil, fmt.Errorf("%w: '%s'", ErrUnknownFilter, qs.Filter)
|
||||
}
|
||||
s := new(netmap.Selector)
|
||||
switch qs.Clause {
|
||||
case "SAME":
|
||||
s.SetClause(netmap.Same)
|
||||
case "DISTINCT":
|
||||
s.SetClause(netmap.Distinct)
|
||||
default:
|
||||
s.SetClause(netmap.UnspecifiedClause)
|
||||
}
|
||||
s.SetName(qs.Name)
|
||||
seenSelectors[qs.Name] = true
|
||||
s.SetFilter(qs.Filter)
|
||||
s.SetAttribute(qs.Bucket)
|
||||
if qs.Count == 0 {
|
||||
return nil, fmt.Errorf("%w: SELECT", ErrInvalidNumber)
|
||||
}
|
||||
s.SetCount(qs.Count)
|
||||
ss = append(ss, s)
|
||||
}
|
||||
|
||||
rs := make([]*netmap.Replica, 0, len(q.Replicas))
|
||||
for _, qr := range q.Replicas {
|
||||
r := new(netmap.Replica)
|
||||
if qr.Selector != "" {
|
||||
if !seenSelectors[qr.Selector] {
|
||||
return nil, fmt.Errorf("%w: '%s'", ErrUnknownSelector, qr.Selector)
|
||||
}
|
||||
r.SetSelector(qr.Selector)
|
||||
}
|
||||
if qr.Count == 0 {
|
||||
return nil, fmt.Errorf("%w: REP", ErrInvalidNumber)
|
||||
}
|
||||
r.SetCount(uint32(qr.Count))
|
||||
rs = append(rs, r)
|
||||
}
|
||||
|
||||
p := new(netmap.PlacementPolicy)
|
||||
p.SetFilters(fs)
|
||||
p.SetSelectors(ss)
|
||||
p.SetReplicas(rs)
|
||||
p.SetContainerBackupFactor(q.CBF)
|
||||
return p, nil
|
||||
}
|
||||
|
||||
func filterFromOrChain(expr *orChain, seen map[string]bool) (*netmap.Filter, error) {
|
||||
var fs []*netmap.Filter
|
||||
for _, ac := range expr.Clauses {
|
||||
f, err := filterFromAndChain(ac, seen)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
fs = append(fs, f)
|
||||
}
|
||||
if len(fs) == 1 {
|
||||
return fs[0], nil
|
||||
}
|
||||
|
||||
f := new(netmap.Filter)
|
||||
f.SetOp(netmap.OR)
|
||||
f.SetFilters(fs)
|
||||
return f, nil
|
||||
}
|
||||
|
||||
func filterFromAndChain(expr *andChain, seen map[string]bool) (*netmap.Filter, error) {
|
||||
var fs []*netmap.Filter
|
||||
for _, fe := range expr.Clauses {
|
||||
var f *netmap.Filter
|
||||
var err error
|
||||
if fe.Expr != nil {
|
||||
f, err = filterFromSimpleExpr(fe.Expr, seen)
|
||||
} else {
|
||||
f = new(netmap.Filter)
|
||||
f.SetName(fe.Reference)
|
||||
}
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
fs = append(fs, f)
|
||||
}
|
||||
if len(fs) == 1 {
|
||||
return fs[0], nil
|
||||
}
|
||||
|
||||
f := new(netmap.Filter)
|
||||
f.SetOp(netmap.AND)
|
||||
f.SetFilters(fs)
|
||||
return f, nil
|
||||
}
|
||||
|
||||
func filterFromSimpleExpr(se *simpleExpr, seen map[string]bool) (*netmap.Filter, error) {
|
||||
f := new(netmap.Filter)
|
||||
f.SetKey(se.Key)
|
||||
switch se.Op {
|
||||
case "EQ":
|
||||
f.SetOp(netmap.EQ)
|
||||
case "NE":
|
||||
f.SetOp(netmap.NE)
|
||||
case "GE":
|
||||
f.SetOp(netmap.GE)
|
||||
case "GT":
|
||||
f.SetOp(netmap.GT)
|
||||
case "LE":
|
||||
f.SetOp(netmap.LE)
|
||||
case "LT":
|
||||
f.SetOp(netmap.LT)
|
||||
default:
|
||||
return nil, fmt.Errorf("%w: '%s'", ErrUnknownOp, se.Op)
|
||||
}
|
||||
f.SetValue(se.Value)
|
||||
return f, nil
|
||||
}
|
||||
230
pkg/policy/query_test.go
Normal file
230
pkg/policy/query_test.go
Normal file
|
|
@ -0,0 +1,230 @@
|
|||
package policy
|
||||
|
||||
import (
|
||||
"errors"
|
||||
"testing"
|
||||
|
||||
"github.com/nspcc-dev/neofs-api-go/v2/netmap"
|
||||
"github.com/stretchr/testify/require"
|
||||
)
|
||||
|
||||
func TestSimple(t *testing.T) {
|
||||
q := `REP 3`
|
||||
expected := new(netmap.PlacementPolicy)
|
||||
expected.SetFilters([]*netmap.Filter{})
|
||||
expected.SetSelectors([]*netmap.Selector{})
|
||||
expected.SetReplicas([]*netmap.Replica{newReplica("", 3)})
|
||||
|
||||
r, err := Parse(q)
|
||||
require.NoError(t, err)
|
||||
require.Equal(t, expected, r)
|
||||
}
|
||||
|
||||
func TestSimpleWithHRWB(t *testing.T) {
|
||||
q := `REP 3 CBF 4`
|
||||
expected := new(netmap.PlacementPolicy)
|
||||
expected.SetFilters([]*netmap.Filter{})
|
||||
expected.SetSelectors([]*netmap.Selector{})
|
||||
expected.SetReplicas([]*netmap.Replica{newReplica("", 3)})
|
||||
expected.SetContainerBackupFactor(4)
|
||||
|
||||
r, err := Parse(q)
|
||||
require.NoError(t, err)
|
||||
require.Equal(t, expected, r)
|
||||
}
|
||||
|
||||
func TestFromSelect(t *testing.T) {
|
||||
q := `REP 1 IN SPB
|
||||
SELECT 1 IN City FROM * AS SPB`
|
||||
expected := new(netmap.PlacementPolicy)
|
||||
expected.SetFilters([]*netmap.Filter{})
|
||||
expected.SetSelectors([]*netmap.Selector{
|
||||
newSelector(1, netmap.UnspecifiedClause, "City", "*", "SPB"),
|
||||
})
|
||||
expected.SetReplicas([]*netmap.Replica{newReplica("SPB", 1)})
|
||||
|
||||
r, err := Parse(q)
|
||||
require.NoError(t, err)
|
||||
require.Equal(t, expected, r)
|
||||
}
|
||||
|
||||
func TestFromSelectClause(t *testing.T) {
|
||||
q := `REP 4
|
||||
SELECT 3 IN Country FROM *
|
||||
SELECT 2 IN SAME City FROM *
|
||||
SELECT 1 IN DISTINCT Continent FROM *`
|
||||
expected := new(netmap.PlacementPolicy)
|
||||
expected.SetFilters([]*netmap.Filter{})
|
||||
expected.SetSelectors([]*netmap.Selector{
|
||||
newSelector(3, netmap.UnspecifiedClause, "Country", "*", ""),
|
||||
newSelector(2, netmap.Same, "City", "*", ""),
|
||||
newSelector(1, netmap.Distinct, "Continent", "*", ""),
|
||||
})
|
||||
expected.SetReplicas([]*netmap.Replica{newReplica("", 4)})
|
||||
|
||||
r, err := Parse(q)
|
||||
require.NoError(t, err)
|
||||
require.Equal(t, expected, r)
|
||||
}
|
||||
|
||||
func TestSimpleFilter(t *testing.T) {
|
||||
q := `REP 1
|
||||
SELECT 1 IN City FROM Good
|
||||
FILTER Rating GT 7 AS Good`
|
||||
expected := new(netmap.PlacementPolicy)
|
||||
expected.SetReplicas([]*netmap.Replica{newReplica("", 1)})
|
||||
expected.SetSelectors([]*netmap.Selector{
|
||||
newSelector(1, netmap.UnspecifiedClause, "City", "Good", ""),
|
||||
})
|
||||
expected.SetFilters([]*netmap.Filter{
|
||||
newFilter("Good", "Rating", "7", netmap.GT),
|
||||
})
|
||||
|
||||
r, err := Parse(q)
|
||||
require.NoError(t, err)
|
||||
require.Equal(t, expected, r)
|
||||
}
|
||||
|
||||
func TestFilterReference(t *testing.T) {
|
||||
q := `REP 1
|
||||
SELECT 2 IN City FROM Good
|
||||
FILTER Country EQ "RU" AS FromRU
|
||||
FILTER @FromRU AND Rating GT 7 AS Good`
|
||||
expected := new(netmap.PlacementPolicy)
|
||||
expected.SetReplicas([]*netmap.Replica{newReplica("", 1)})
|
||||
expected.SetSelectors([]*netmap.Selector{
|
||||
newSelector(2, netmap.UnspecifiedClause, "City", "Good", ""),
|
||||
})
|
||||
expected.SetFilters([]*netmap.Filter{
|
||||
newFilter("FromRU", "Country", "RU", netmap.EQ),
|
||||
newFilter("Good", "", "", netmap.AND,
|
||||
newFilter("FromRU", "", "", netmap.UnspecifiedOperation),
|
||||
newFilter("", "Rating", "7", netmap.GT)),
|
||||
})
|
||||
|
||||
r, err := Parse(q)
|
||||
require.NoError(t, err)
|
||||
require.Equal(t, expected, r)
|
||||
}
|
||||
|
||||
func TestFilterOps(t *testing.T) {
|
||||
q := `REP 1
|
||||
SELECT 2 IN City FROM Good
|
||||
FILTER A GT 1 AND B GE 2 AND C LT 3 AND D LE 4
|
||||
AND E EQ 5 AND F NE 6 AS Good`
|
||||
expected := new(netmap.PlacementPolicy)
|
||||
expected.SetReplicas([]*netmap.Replica{newReplica("", 1)})
|
||||
expected.SetSelectors([]*netmap.Selector{
|
||||
newSelector(2, netmap.UnspecifiedClause, "City", "Good", ""),
|
||||
})
|
||||
expected.SetFilters([]*netmap.Filter{
|
||||
newFilter("Good", "", "", netmap.AND,
|
||||
newFilter("", "A", "1", netmap.GT),
|
||||
newFilter("", "B", "2", netmap.GE),
|
||||
newFilter("", "C", "3", netmap.LT),
|
||||
newFilter("", "D", "4", netmap.LE),
|
||||
newFilter("", "E", "5", netmap.EQ),
|
||||
newFilter("", "F", "6", netmap.NE)),
|
||||
})
|
||||
|
||||
r, err := Parse(q)
|
||||
require.NoError(t, err)
|
||||
require.Equal(t, expected, r)
|
||||
}
|
||||
|
||||
func TestWithFilterPrecedence(t *testing.T) {
|
||||
q := `REP 7 IN SPB
|
||||
SELECT 1 IN City FROM SPBSSD AS SPB
|
||||
FILTER City EQ "SPB" AND SSD EQ true OR City EQ "SPB" AND Rating GE 5 AS SPBSSD`
|
||||
expected := new(netmap.PlacementPolicy)
|
||||
expected.SetReplicas([]*netmap.Replica{newReplica("SPB", 7)})
|
||||
expected.SetSelectors([]*netmap.Selector{
|
||||
newSelector(1, netmap.UnspecifiedClause, "City", "SPBSSD", "SPB"),
|
||||
})
|
||||
expected.SetFilters([]*netmap.Filter{
|
||||
newFilter("SPBSSD", "", "", netmap.OR,
|
||||
newFilter("", "", "", netmap.AND,
|
||||
newFilter("", "City", "SPB", netmap.EQ),
|
||||
newFilter("", "SSD", "true", netmap.EQ)),
|
||||
newFilter("", "", "", netmap.AND,
|
||||
newFilter("", "City", "SPB", netmap.EQ),
|
||||
newFilter("", "Rating", "5", netmap.GE))),
|
||||
})
|
||||
|
||||
r, err := Parse(q)
|
||||
require.NoError(t, err)
|
||||
require.Equal(t, expected, r)
|
||||
}
|
||||
|
||||
func TestValidation(t *testing.T) {
|
||||
t.Run("MissingSelector", func(t *testing.T) {
|
||||
q := `REP 3 IN RU`
|
||||
_, err := Parse(q)
|
||||
require.True(t, errors.Is(err, ErrUnknownSelector), "got: %v", err)
|
||||
})
|
||||
t.Run("MissingFilter", func(t *testing.T) {
|
||||
q := `REP 3
|
||||
SELECT 1 IN City FROM MissingFilter`
|
||||
_, err := Parse(q)
|
||||
require.True(t, errors.Is(err, ErrUnknownFilter), "got: %v", err)
|
||||
})
|
||||
t.Run("UnknownOp", func(t *testing.T) {
|
||||
q := `REP 3
|
||||
SELECT 1 IN City FROM F
|
||||
FILTER Country KEK RU AS F`
|
||||
_, err := Parse(q)
|
||||
require.True(t, errors.Is(err, ErrUnknownOp), "got: %v", err)
|
||||
})
|
||||
t.Run("TypoInREP", func(t *testing.T) {
|
||||
q := `REK 3`
|
||||
_, err := Parse(q)
|
||||
require.Error(t, err)
|
||||
})
|
||||
t.Run("InvalidFilterName", func(t *testing.T) {
|
||||
q := `REP 3
|
||||
SELECT 1 IN City FROM F
|
||||
FILTER Good AND Country EQ RU AS F
|
||||
FILTER Rating EQ 5 AS Good`
|
||||
_, err := Parse(q)
|
||||
require.Error(t, err)
|
||||
})
|
||||
t.Run("InvalidNumberInREP", func(t *testing.T) {
|
||||
q := `REP 0`
|
||||
_, err := Parse(q)
|
||||
require.True(t, errors.Is(err, ErrInvalidNumber), "got: %v", err)
|
||||
})
|
||||
t.Run("InvalidNumberInREP", func(t *testing.T) {
|
||||
q := `REP 1 IN Good
|
||||
SELECT 0 IN City FROM *`
|
||||
_, err := Parse(q)
|
||||
require.True(t, errors.Is(err, ErrInvalidNumber), "got: %v", err)
|
||||
})
|
||||
|
||||
}
|
||||
|
||||
func newFilter(name, key, value string, op netmap.Operation, sub ...*netmap.Filter) *netmap.Filter {
|
||||
f := new(netmap.Filter)
|
||||
f.SetName(name)
|
||||
f.SetKey(key)
|
||||
f.SetValue(value)
|
||||
f.SetOp(op)
|
||||
f.SetFilters(sub)
|
||||
return f
|
||||
}
|
||||
|
||||
func newReplica(s string, c uint32) *netmap.Replica {
|
||||
r := new(netmap.Replica)
|
||||
r.SetSelector(s)
|
||||
r.SetCount(c)
|
||||
return r
|
||||
}
|
||||
|
||||
func newSelector(count uint32, c netmap.Clause, attr, f, name string) *netmap.Selector {
|
||||
s := new(netmap.Selector)
|
||||
s.SetCount(count)
|
||||
s.SetClause(c)
|
||||
s.SetAttribute(attr)
|
||||
s.SetFilter(f)
|
||||
s.SetName(name)
|
||||
return s
|
||||
}
|
||||
Loading…
Reference in a new issue