Support passing GraphQL schema to bulk loader. (#5509)

Support passing a GraphQL schema file to the bulk loader. The bulk loader will generate
the triples relevant triples expected by Dgraph.

Related to DGRAPH-1283

dgraph/cmd/bulk/loader.go

@@ -27,6 +27,7 @@ import (
 	"log"
 	"os"
 	"path/filepath"
+	"strconv"
 	"sync"
 	"time"
 
@@ -47,6 +48,7 @@ type options struct {
 	DataFiles        string
 	DataFormat       string
 	SchemaFile       string
+	GqlSchemaFile    string
 	OutDir           string
 	ReplaceOutDir    bool
 	TmpDir           string
@@ -237,6 +239,9 @@ func (ld *loader) mapStage() {
 	}
 	x.Check(thr.Finish())
 
+	// Send the graphql triples
+	ld.processGqlSchema(loadType)
+
 	close(ld.readerChunkCh)
 	mapperWg.Wait()
 
@@ -251,6 +256,51 @@ func (ld *loader) mapStage() {
 	ld.xids = nil
 }
 
+func (ld *loader) processGqlSchema(loadType chunker.InputFormat) {
+	if ld.opt.GqlSchemaFile == "" {
+		return
+	}
+
+	f, err := os.Open(ld.opt.GqlSchemaFile)
+	x.Check(err)
+	defer f.Close()
+
+	key := ld.opt.EncryptionKey
+	if !ld.opt.Encrypted {
+		key = nil
+	}
+	r, err := enc.GetReader(key, f)
+	x.Check(err)
+	if filepath.Ext(ld.opt.GqlSchemaFile) == ".gz" {
+		r, err = gzip.NewReader(r)
+		x.Check(err)
+	}
+
+	buf, err := ioutil.ReadAll(r)
+	x.Check(err)
+
+	rdfSchema := `_:gqlschema <dgraph.type> "dgraph.graphql" .
+	_:gqlschema <dgraph.graphql.xid> "dgraph.graphql.schema" .
+	_:gqlschema <dgraph.graphql.schema> %s .
+	`
+
+	jsonSchema := `{
+		"dgraph.type": "dgraph.graphql",
+		"dgraph.graphql.xid": "dgraph.graphql.schema",
+		"dgraph.graphql.schema": %s
+	}`
+
+	gqlBuf := &bytes.Buffer{}
+	schema := strconv.Quote(string(buf))
+	switch loadType {
+	case chunker.RdfFormat:
+		x.Check2(gqlBuf.Write([]byte(fmt.Sprintf(rdfSchema, schema))))
+	case chunker.JsonFormat:
+		x.Check2(gqlBuf.Write([]byte(fmt.Sprintf(jsonSchema, schema))))
+	}
+	ld.readerChunkCh <- gqlBuf
+}
+
 func (ld *loader) reduceStage() {
 	ld.prog.setPhase(reducePhase)
 

dgraph/cmd/bulk/run.go

@@ -56,6 +56,7 @@ func init() {
 		"Location of *.rdf(.gz) or *.json(.gz) file(s) to load.")
 	flag.StringP("schema", "s", "",
 		"Location of schema file.")
+	flag.StringP("graphql_schema", "g", "", "Location of the GraphQL schema file.")
 	flag.String("format", "",
 		"Specify file format (rdf or json) instead of getting it from filename.")
 	flag.Bool("encrypted", false,
@@ -116,6 +117,7 @@ func run() {
 		DataFiles:              Bulk.Conf.GetString("files"),
 		DataFormat:             Bulk.Conf.GetString("format"),
 		SchemaFile:             Bulk.Conf.GetString("schema"),
+		GqlSchemaFile:          Bulk.Conf.GetString("graphql_schema"),
 		Encrypted:              Bulk.Conf.GetBool("encrypted"),
 		OutDir:                 Bulk.Conf.GetString("out"),
 		ReplaceOutDir:          Bulk.Conf.GetBool("replace_out"),

systest/bulk_live_cases_test.go

@@ -343,7 +343,7 @@ func TestBulkSingleUid(t *testing.T) {
 		_:erin  <name> "Erin" .
 		_:frank <name> "Frank" .
 		_:grace <name> "Grace" .
-	`)
+	`, "")
 	defer s.cleanup()
 
 	// Ensures that the index keys are written to disk after commit.
@@ -474,7 +474,7 @@ func TestDeleteEdgeWithStar(t *testing.T) {
 
 		<0x2> <name> "Alice" .
 		<0x3> <name> "Bob" .
-	`)
+	`, "")
 	defer s.cleanup()
 
 	_, err := s.bulkCluster.client.NewTxn().Mutate(context.Background(), &api.Mutation{
@@ -497,6 +497,28 @@ func TestDeleteEdgeWithStar(t *testing.T) {
 
 }
 
+func TestGqlSchema(t *testing.T) {
+	s := newBulkOnlySuite(t, "", "", "abc")
+	defer s.cleanup()
+
+	t.Run("Get GraphQL schema", s.testCase(`
+	{
+		schema(func: has(dgraph.graphql.schema)) {
+			dgraph.graphql.schema
+			dgraph.graphql.xid
+			dgraph.type
+		}
+	}`, `
+		{
+			"schema": [{
+				"dgraph.graphql.schema": "abc",
+				"dgraph.graphql.xid": "dgraph.graphql.schema",
+				"dgraph.type": ["dgraph.graphql"]
+			}]
+		}`))
+
+}
+
 // TODO: Fix this later.
 func DONOTRUNTestGoldenData(t *testing.T) {
 	if testing.Short() {
@@ -506,6 +528,7 @@ func DONOTRUNTestGoldenData(t *testing.T) {
 	s := newSuiteFromFile(t,
 		os.ExpandEnv("$GOPATH/src/github.com/dgraph-io/dgraph/systest/data/goldendata.schema"),
 		os.ExpandEnv("$GOPATH/src/github.com/dgraph-io/dgraph/systest/data/goldendata.rdf.gz"),
+		"",
 	)
 	defer s.cleanup()
 

systest/bulk_live_fixture_test.go

@@ -53,6 +53,7 @@ type suite struct {
 
 type suiteOpts struct {
 	schema         string
+	gqlSchema      string
 	rdfs           string
 	skipBulkLoader bool
 	skipLiveLoader bool
@@ -85,7 +86,9 @@ func newSuiteInternal(t *testing.T, opts suiteOpts) *suite {
 	s.checkFatal(ioutil.WriteFile(rdfFile, []byte(opts.rdfs), 0644))
 	schemaFile := filepath.Join(rootDir, "schema.txt")
 	s.checkFatal(ioutil.WriteFile(schemaFile, []byte(opts.schema), 0644))
-	s.setup(schemaFile, rdfFile)
+	gqlSchemaFile := filepath.Join(rootDir, "gql_schema.txt")
+	s.checkFatal(ioutil.WriteFile(gqlSchemaFile, []byte(opts.gqlSchema), 0644))
+	s.setup(schemaFile, rdfFile, gqlSchemaFile)
 	return s
 }
 
@@ -97,26 +100,27 @@ func newSuite(t *testing.T, schema, rdfs string) *suite {
 	return newSuiteInternal(t, opts)
 }
 
-func newBulkOnlySuite(t *testing.T, schema, rdfs string) *suite {
+func newBulkOnlySuite(t *testing.T, schema, rdfs, gqlSchema string) *suite {
 	opts := suiteOpts{
 		schema:         schema,
+		gqlSchema:      gqlSchema,
 		rdfs:           rdfs,
 		skipLiveLoader: true,
 	}
 	return newSuiteInternal(t, opts)
 }
 
-func newSuiteFromFile(t *testing.T, schemaFile, rdfFile string) *suite {
+func newSuiteFromFile(t *testing.T, schemaFile, rdfFile, gqlSchemaFile string) *suite {
 	if testing.Short() {
 		t.Skip("Skipping system test with long runtime.")
 	}
 	s := &suite{t: t}
 
-	s.setup(schemaFile, rdfFile)
+	s.setup(schemaFile, rdfFile, gqlSchemaFile)
 	return s
 }
 
-func (s *suite) setup(schemaFile, rdfFile string) {
+func (s *suite) setup(schemaFile, rdfFile, gqlSchemaFile string) {
 	var (
 		bulkDir = filepath.Join(rootDir, "bulk")
 		liveDir = filepath.Join(rootDir, "live")
@@ -137,6 +141,7 @@ func (s *suite) setup(schemaFile, rdfFile string) {
 		bulkCmd := exec.Command(testutil.DgraphBinaryPath(), "bulk",
 			"-f", rdfFile,
 			"-s", schemaFile,
+			"-g", gqlSchemaFile,
 			"--http", "localhost:"+strconv.Itoa(freePort(0)),
 			"-j=1",
 			"--store_xids=true",