initial addition for exporting functionality

cmd/cayley/cayley.go

@@ -49,6 +49,8 @@ var (
 	configFile         = flag.String("config", "", "Path to an explicit configuration file.")
 	databasePath       = flag.String("dbpath", "/tmp/testdb", "Path to the database.")
 	databaseBackend    = flag.String("db", "memstore", "Database Backend.")
+	dumpFile           = flag.String("dump", "dbdump.nq", `Quad file to dump the database to (".gz" supported, "-" for stdout).`)
+	dumpType           = flag.String("dump_type", "json", `Quad file format ("json", "nquad").`)
 	replicationBackend = flag.String("replication", "single", "Replication method.")
 	host               = flag.String("host", "127.0.0.1", "Host to listen on (defaults to all).")
 	loadSize           = flag.Int("load_size", 10000, "Size of quadsets to load")
@@ -72,6 +74,7 @@ Commands:
   init      Create an empty database.
   load      Bulk-load a quad file into the database.
   http      Serve an HTTP endpoint on the given host and port.
+  dump      Bulk-dump the database into a quad file.
   repl      Drop into a REPL of the given query language.
   version   Version information.
 
@@ -204,6 +207,21 @@ func main() {
 
 		handle.Close()
 
+	case "dump":
+		handle, err = db.Open(cfg)
+		if err != nil {
+			break
+		}
+		if !graph.IsPersistent(cfg.DatabaseType) {
+			err = internal.Load(handle.QuadWriter, cfg, *quadFile, *quadType)
+			if err != nil {
+				break
+			}
+		}
+
+		// internal.Dump()
+		handle.Close()
+
 	case "repl":
 		handle, err = db.Open(cfg)
 		if err != nil {