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// Copyright (C) MongoDB, Inc. 2017-present.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
package bsonrw
import (
"fmt"
"io"
"strings"
"testing"
"github.com/google/go-cmp/cmp"
"go.mongodb.org/mongo-driver/bson/bsontype"
)
func TestExtJSONReader(t *testing.T) {
t.Run("ReadDocument", func(t *testing.T) {
t.Run("EmbeddedDocument", func(t *testing.T) {
ejvr := &extJSONValueReader{
stack: []ejvrState{
{mode: mTopLevel},
{mode: mElement, vType: bsontype.Boolean},
},
frame: 1,
}
ejvr.stack[1].mode = mArray
wanterr := ejvr.invalidTransitionErr(mDocument, "ReadDocument", []mode{mTopLevel, mElement, mValue})
_, err := ejvr.ReadDocument()
if err == nil || err.Error() != wanterr.Error() {
t.Errorf("Incorrect returned error. got %v; want %v", err, wanterr)
}
})
})
t.Run("invalid transition", func(t *testing.T) {
t.Run("Skip", func(t *testing.T) {
ejvr := &extJSONValueReader{stack: []ejvrState{{mode: mTopLevel}}}
wanterr := (&extJSONValueReader{stack: []ejvrState{{mode: mTopLevel}}}).invalidTransitionErr(0, "Skip", []mode{mElement, mValue})
goterr := ejvr.Skip()
if !cmp.Equal(goterr, wanterr, cmp.Comparer(compareErrors)) {
t.Errorf("Expected correct invalid transition error. got %v; want %v", goterr, wanterr)
}
})
})
}
func TestReadMultipleTopLevelDocuments(t *testing.T) {
testCases := []struct {
name string
input string
expected [][]byte
}{
{
"single top-level document",
"{\"foo\":1}",
[][]byte{
{0x0E, 0x00, 0x00, 0x00, 0x10, 'f', 'o', 'o', 0x00, 0x01, 0x00, 0x00, 0x00, 0x00},
},
},
{
"single top-level document with leading and trailing whitespace",
"\n\n {\"foo\":1} \n",
[][]byte{
{0x0E, 0x00, 0x00, 0x00, 0x10, 'f', 'o', 'o', 0x00, 0x01, 0x00, 0x00, 0x00, 0x00},
},
},
{
"two top-level documents",
"{\"foo\":1}{\"foo\":2}",
[][]byte{
{0x0E, 0x00, 0x00, 0x00, 0x10, 'f', 'o', 'o', 0x00, 0x01, 0x00, 0x00, 0x00, 0x00},
{0x0E, 0x00, 0x00, 0x00, 0x10, 'f', 'o', 'o', 0x00, 0x02, 0x00, 0x00, 0x00, 0x00},
},
},
{
"two top-level documents with leading and trailing whitespace and whitespace separation ",
"\n\n {\"foo\":1}\n{\"foo\":2}\n ",
[][]byte{
{0x0E, 0x00, 0x00, 0x00, 0x10, 'f', 'o', 'o', 0x00, 0x01, 0x00, 0x00, 0x00, 0x00},
{0x0E, 0x00, 0x00, 0x00, 0x10, 'f', 'o', 'o', 0x00, 0x02, 0x00, 0x00, 0x00, 0x00},
},
},
{
"top-level array with single document",
"[{\"foo\":1}]",
[][]byte{
{0x0E, 0x00, 0x00, 0x00, 0x10, 'f', 'o', 'o', 0x00, 0x01, 0x00, 0x00, 0x00, 0x00},
},
},
{
"top-level array with 2 documents",
"[{\"foo\":1},{\"foo\":2}]",
[][]byte{
{0x0E, 0x00, 0x00, 0x00, 0x10, 'f', 'o', 'o', 0x00, 0x01, 0x00, 0x00, 0x00, 0x00},
{0x0E, 0x00, 0x00, 0x00, 0x10, 'f', 'o', 'o', 0x00, 0x02, 0x00, 0x00, 0x00, 0x00},
},
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
r := strings.NewReader(tc.input)
vr, err := NewExtJSONValueReader(r, false)
if err != nil {
t.Fatalf("expected no error, but got %v", err)
}
actual, err := readAllDocuments(vr)
if err != nil {
t.Fatalf("expected no error, but got %v", err)
}
if diff := cmp.Diff(tc.expected, actual); diff != "" {
t.Fatalf("expected does not match actual: %v", diff)
}
})
}
}
func readAllDocuments(vr ValueReader) ([][]byte, error) {
c := NewCopier()
var actual [][]byte
switch vr.Type() {
case bsontype.EmbeddedDocument:
for {
result, err := c.CopyDocumentToBytes(vr)
if err != nil {
if err == io.EOF {
break
}
return nil, err
}
actual = append(actual, result)
}
case bsontype.Array:
ar, err := vr.ReadArray()
if err != nil {
return nil, err
}
for {
evr, err := ar.ReadValue()
if err != nil {
if err == ErrEOA {
break
}
return nil, err
}
result, err := c.CopyDocumentToBytes(evr)
if err != nil {
return nil, err
}
actual = append(actual, result)
}
default:
return nil, fmt.Errorf("expected an array or a document, but got %s", vr.Type())
}
return actual, nil
}
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