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service.go
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service.go
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// Copyright (C) 2014 Constantin Schomburg <me@cschomburg.com>
//
// Use of this source code is governed by an MIT-style
// license that can be found in the LICENSE file.
// Service reasoner provides a knowledge base and inference engine.
package reasoner
import (
"strconv"
"strings"
"github.com/jinzhu/gorm"
"github.com/sarifsystems/sarif/pkg/sparql"
"github.com/sarifsystems/sarif/sarif"
"github.com/sarifsystems/sarif/services"
)
var Module = &services.Module{
Name: "reasoner",
Version: "1.0",
NewInstance: NewService,
}
type Dependencies struct {
DB *gorm.DB
Client sarif.Client
}
type Service struct {
DB *gorm.DB
sarif.Client
}
func NewService(deps *Dependencies) *Service {
s := &Service{
DB: deps.DB,
Client: deps.Client,
}
return s
}
func (s *Service) Enable() error {
createIndizes := !s.DB.HasTable(&Fact{})
if err := s.DB.AutoMigrate(&Fact{}).Error; err != nil {
return err
}
if createIndizes {
if err := s.DB.Model(&Fact{}).AddIndex("subject_predicate", "subject", "predicate").Error; err != nil {
return err
}
if err := s.DB.Model(&Fact{}).AddIndex("predicate_object", "predicate", "object").Error; err != nil {
return err
}
}
s.Subscribe("concepts/query", "", s.HandleQuery)
s.Subscribe("concepts/query_external", "", s.HandleQueryExternal)
s.Subscribe("concepts/store", "", s.HandleStore)
s.Subscribe("concept", "", s.HandleStore)
return nil
}
type resultPayload struct {
Result interface{} `json:"result"`
Facts []*Fact `json:"facts"`
}
func (p resultPayload) Text() string {
if p.Facts == nil || len(p.Facts) == 0 {
return "No facts."
}
s := strings.Join(FormSentences(p.Facts), "\n")
if s != "" {
return s
}
for _, f := range p.Facts {
if s != "" {
s += "\n"
}
s += f.String()
}
return s
}
func (s *Service) HandleQuery(msg sarif.Message) {
var f Fact
if err := msg.DecodePayload(&f); err != nil {
s.ReplyBadRequest(msg, err)
return
}
f, err := s.InterpretLiterals(f)
if err != nil {
s.ReplyInternalError(msg, err)
return
}
var facts []*Fact
if err := s.DB.Where(f).Limit(100).Find(&facts).Error; err != nil {
s.ReplyInternalError(msg, err)
return
}
if facts, err = s.AddLabelFacts(facts); err != nil {
s.ReplyInternalError(msg, err)
return
}
s.Reply(msg, sarif.CreateMessage("concepts/result", &resultPayload{
ToJsonLd(facts),
facts,
}))
}
func (s *Service) InterpretLiterals(f Fact) (Fact, error) {
f.FillMissingTypes()
literals := make([]string, 0)
if f.SubjectType == "literal" {
literals = append(literals, f.Subject)
}
if f.PredicateType == "literal" {
literals = append(literals, f.Predicate)
}
if f.ObjectType == "literal" {
literals = append(literals, f.Object)
}
if len(literals) == 0 {
return f, nil
}
var results []*Fact
err := s.DB.
Where("predicate = ?", "rdfs:label").
Where("object IN (?)", literals).
Find(&results).
Error
if err != nil {
return f, err
}
for _, r := range results {
f.EachType(func(s, t string) (string, string) {
if s == r.Object {
return r.Subject, "uri"
}
return s, t
})
}
return f, nil
}
func (s *Service) HandleStore(msg sarif.Message) {
var f Fact
if err := msg.DecodePayload(&f); err != nil {
s.ReplyBadRequest(msg, err)
return
}
f, err := s.InterpretLiterals(f)
if err != nil {
s.ReplyBadRequest(msg, err)
return
}
db := s.DB.Where(Fact{Subject: f.Subject, Predicate: f.Predicate})
db = s.DB.Assign(f)
if err := db.FirstOrCreate(&f).Error; err != nil {
s.ReplyInternalError(msg, err)
return
}
s.Reply(msg, sarif.CreateMessage("concepts/stored", &f))
}
func (s *Service) HandleQueryExternal(msg sarif.Message) {
var f Fact
if err := msg.DecodePayload(&f); err != nil {
s.ReplyBadRequest(msg, err)
return
}
facts := []*Fact{&f}
FillVariables(facts)
var r sparql.ResourceResponse
q := sparql.DBPedia.Query()
q = BuildQuery(q, facts)
if err := q.Exec(&r); err != nil {
s.ReplyInternalError(msg, err)
return
}
result := ApplyBindings(facts, r.Results.Bindings, sparql.CommonPrefixes)
s.Reply(msg, sarif.CreateMessage("concepts/result", &resultPayload{
ToJsonLd(result),
result,
}))
for _, f := range result {
if err := s.DB.FirstOrCreate(&f, &f).Error; err != nil {
s.Log("err", "[reasoner] error updating external fact: "+err.Error())
}
}
}
func (s *Service) AddLabelFacts(fs []*Fact) ([]*Fact, error) {
_, missing := GetLabelMappings(fs)
if len(missing) == 0 {
return fs, nil
}
var results []*Fact
err := s.DB.
Where("predicate = ?", "rdfs:label").
Where("subject IN (?)", missing).
Find(&results).
Error
if err != nil {
return fs, err
}
return append(fs, results...), nil
}
func FillVariables(fs []*Fact) {
for i, f := range fs {
if f.Subject == "" {
f.Subject = "?s_gen" + strconv.Itoa(i)
}
if f.Predicate == "" {
f.Predicate = "?p_gen" + strconv.Itoa(i)
}
if f.Object == "" {
f.Object = "?o_gen" + strconv.Itoa(i)
}
}
}
func BuildQuery(q *sparql.Query, facts []*Fact) *sparql.Query {
for _, f := range facts {
q = q.Where(f.Subject, f.Predicate, f.Object)
if f.Predicate == "rdfs:label" {
q = q.FilterLang(f.Object, "EN")
}
}
return q
}
func ApplyBindings(fs []*Fact, bs []sparql.Row, ns map[string]string) []*Fact {
result := make([]*Fact, 0, len(fs))
for i, br := range bs {
for _, fOrig := range fs {
f := *fOrig
modified := false
for v, b := range br {
v = "?" + v
value := b.Value
if b.Type == "uri" {
value = AddNamespacePrefix(value, ns)
}
if f.Subject == v {
f.Subject = value
f.SubjectType = b.Type
modified = true
}
if f.Predicate == v {
f.Predicate = value
f.PredicateType = b.Type
modified = true
}
if f.Object == v {
f.Object = value
f.ObjectType = b.Type
modified = true
}
}
if i == 0 || modified {
result = append(result, &f)
}
}
}
return result
}
func AddNamespacePrefix(s string, ns map[string]string) string {
for prefix, uri := range ns {
if strings.HasPrefix(s, uri) {
return prefix + ":" + strings.TrimPrefix(s, uri)
}
}
return s
}
func CreateURIFromLiteral(s string) string {
return "sarif:" + strings.Replace(s, " ", "_", -1)
}