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/
response_rewriter_test.go
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/
response_rewriter_test.go
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package dvara
import (
"bytes"
"errors"
"io"
"reflect"
"strings"
"testing"
"github.com/davecgh/go-spew/spew"
"github.com/facebookgo/ensure"
"github.com/facebookgo/inject"
"github.com/facebookgo/startstop"
"gopkg.in/mgo.v2/bson"
)
var errInvalidBSON = errors.New("invalid BSON")
type invalidBSON int
func (i invalidBSON) GetBSON() (interface{}, error) {
return nil, errInvalidBSON
}
var errProxyNotFound = errors.New("proxy not found")
type fakeProxyMapper struct {
m map[string]string
}
func (t fakeProxyMapper) Proxy(h string) (string, error) {
if t.m != nil {
if r, ok := t.m[h]; ok {
return r, nil
}
}
return "", errProxyNotFound
}
func fakeReader(h messageHeader, rest []byte) io.Reader {
return bytes.NewReader(append(h.ToWire(), rest...))
}
func fakeSingleDocReply(v interface{}) io.Reader {
b, err := bson.Marshal(v)
if err != nil {
panic(err)
}
b = append(
[]byte{
0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0,
1, 0, 0, 0,
},
b...,
)
h := messageHeader{
OpCode: OpReply,
MessageLength: int32(headerLen + len(b)),
}
return fakeReader(h, b)
}
type fakeReadWriter struct {
io.Reader
io.Writer
}
func TestResponseRWReadOne(t *testing.T) {
t.Parallel()
cases := []struct {
Name string
Server io.Reader
Error string
}{
{
Name: "no header",
Server: bytes.NewReader(nil),
Error: "EOF",
},
{
Name: "non reply op",
Server: bytes.NewReader((messageHeader{OpCode: OpDelete}).ToWire()),
Error: "expected op REPLY, got DELETE",
},
{
Name: "EOF before flags",
Server: bytes.NewReader((messageHeader{OpCode: OpReply}).ToWire()),
Error: "EOF",
},
{
Name: "more than 1 document",
Server: fakeReader(
messageHeader{OpCode: OpReply},
[]byte{
0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0,
2, 0, 0, 0,
},
),
Error: "can only handle 1 result document, got: 2",
},
{
Name: "EOF before document",
Server: fakeReader(
messageHeader{OpCode: OpReply},
[]byte{
0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0,
1, 0, 0, 0,
},
),
Error: "EOF",
},
{
Name: "corrupted document",
Server: fakeReader(
messageHeader{OpCode: OpReply},
[]byte{
0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0,
1, 0, 0, 0,
5, 0, 0, 0,
1,
},
),
Error: "Document is corrupted",
},
}
for _, c := range cases {
r := &ReplyRW{}
m := bson.M{}
_, _, _, err := r.ReadOne(c.Server, m)
if err == nil {
t.Errorf("was expecting an error for case %s", c.Name)
}
if !strings.Contains(err.Error(), c.Error) {
t.Errorf("did not get expected error for case %s instead got %s", c.Name, err)
}
}
}
func TestResponseRWWriteOne(t *testing.T) {
errWrite := errors.New("write error")
t.Parallel()
cases := []struct {
Name string
Client io.Writer
Header messageHeader
Prefix replyPrefix
DocLen int32
Value interface{}
Error string
}{
{
Name: "invalid bson",
Value: invalidBSON(0),
Error: errInvalidBSON.Error(),
},
{
Name: "write error",
Value: map[string]string{},
Client: testWriter{
write: func(b []byte) (int, error) {
return 0, errWrite
},
},
Error: errWrite.Error(),
},
}
for _, c := range cases {
r := &ReplyRW{}
err := r.WriteOne(c.Client, &c.Header, c.Prefix, c.DocLen, c.Value)
if err == nil {
t.Errorf("was expecting an error for case %s", c.Name)
}
if !strings.Contains(err.Error(), c.Error) {
t.Errorf("did not get expected error for case %s instead got %s", c.Name, err)
}
}
}
func TestIsMasterResponseRewriterSuccess(t *testing.T) {
proxyMapper := fakeProxyMapper{
m: map[string]string{
"a": "1",
"b": "2",
"c": "3",
},
}
in := bson.M{
"hosts": []interface{}{"a", "b", "c"},
"me": "a",
"arbiters": []interface{}{"fooarbiter"},
"primary": "b",
"foo": "bar",
}
out := bson.M{
"hosts": []interface{}{"1", "2", "3"},
"me": "1",
"primary": "2",
"foo": "bar",
}
r := &IsMasterResponseRewriter{
ProxyMapper: proxyMapper,
ReplyRW: &ReplyRW{},
}
var client bytes.Buffer
if err := r.Rewrite(&client, fakeSingleDocReply(in)); err != nil {
t.Fatal(err)
}
actualOut := bson.M{}
doc := client.Bytes()[headerLen+len(emptyPrefix):]
if err := bson.Unmarshal(doc, &actualOut); err != nil {
t.Fatal(err)
}
if !reflect.DeepEqual(out, actualOut) {
spew.Dump(out)
spew.Dump(actualOut)
t.Fatal("did not get expected output")
}
}
func TestIsMasterResponseRewriterSuccessWithPassives(t *testing.T) {
proxyMapper := fakeProxyMapper{
m: map[string]string{
"a": "1",
"b": "2",
"c": "3",
},
}
in := bson.M{
"hosts": []interface{}{"a", "b", "c"},
"me": "a",
"primary": "b",
"foo": "bar",
"passives": []interface{}{"a"},
}
out := bson.M{
"hosts": []interface{}{"1", "2", "3"},
"me": "1",
"primary": "2",
"foo": "bar",
"passives": []interface{}{"1"},
}
r := &IsMasterResponseRewriter{
ProxyMapper: proxyMapper,
ReplyRW: &ReplyRW{},
}
var client bytes.Buffer
if err := r.Rewrite(&client, fakeSingleDocReply(in)); err != nil {
t.Fatal(err)
}
actualOut := bson.M{}
doc := client.Bytes()[headerLen+len(emptyPrefix):]
if err := bson.Unmarshal(doc, &actualOut); err != nil {
t.Fatal(err)
}
if !reflect.DeepEqual(out, actualOut) {
spew.Dump(out)
spew.Dump(actualOut)
t.Fatal("did not get expected output")
}
}
func TestReplSetGetStatusResponseRewriterSuccess(t *testing.T) {
proxyMapper := fakeProxyMapper{
m: map[string]string{
"a": "1",
"b": "2",
"c": "3",
},
}
in := bson.M{
"members": []interface{}{
bson.M{
"name": "a",
"stateStr": "PRIMARY",
},
bson.M{
"name": "b",
},
bson.M{
"name": "c",
"stateStr": "ARBITER",
},
},
}
out := bson.M{
"members": []interface{}{
bson.M{
"name": "1",
"stateStr": "PRIMARY",
},
bson.M{
"name": "2",
},
bson.M{
"name": "3",
"stateStr": "ARBITER",
},
},
}
r := &ReplSetGetStatusResponseRewriter{
ProxyMapper: proxyMapper,
ReplyRW: &ReplyRW{},
}
var client bytes.Buffer
if err := r.Rewrite(&client, fakeSingleDocReply(in)); err != nil {
t.Fatal(err)
}
actualOut := bson.M{}
doc := client.Bytes()[headerLen+len(emptyPrefix):]
if err := bson.Unmarshal(doc, &actualOut); err != nil {
t.Fatal(err)
}
if !reflect.DeepEqual(out, actualOut) {
spew.Dump(out)
spew.Dump(actualOut)
t.Fatal("did not get expected output")
}
}
func TestReplSetGetStatusResponseRewriterAuthFailure(t *testing.T) {
proxyMapper := fakeProxyMapper{
m: map[string]string{
"a": "1",
"b": "2",
"c": "3",
},
}
in := bson.M{
"code": 13,
}
r := &ReplSetGetStatusResponseRewriter{
ProxyMapper: proxyMapper,
ReplyRW: &ReplyRW{},
}
var client bytes.Buffer
if err := r.Rewrite(&client, fakeSingleDocReply(in)); err == nil {
t.Fatal("Rewrite did not fail, though authentication failed")
}
}
func TestProxyQuery(t *testing.T) {
t.Parallel()
var p ProxyQuery
var log NoopLogger
var graph inject.Graph
err := graph.Provide(
&inject.Object{Value: &fakeProxyMapper{}},
&inject.Object{Value: &p},
)
ensure.Nil(t, err)
ensure.Nil(t, graph.Populate())
objects := graph.Objects()
ensure.Nil(t, startstop.Start(objects, &log))
defer startstop.Stop(objects, &log)
cases := []struct {
Name string
Header *messageHeader
Client io.ReadWriter
Error string
}{
{
Name: "EOF while reading flags from client",
Header: &messageHeader{},
Client: new(bytes.Buffer),
Error: "EOF",
},
{
Name: "EOF while reading collection name",
Header: &messageHeader{},
Client: fakeReadWriter{
Reader: bytes.NewReader(
[]byte{0, 0, 0, 0}, // flags int32 before collection name
),
},
Error: "EOF",
},
{
Name: "EOF while reading skip/return",
Header: &messageHeader{},
Client: fakeReadWriter{
Reader: bytes.NewReader(
append(
[]byte{0, 0, 0, 0}, // flags int32 before collection name
adminCollectionName...,
),
),
},
Error: "EOF",
},
{
Name: "EOF while reading query document",
Header: &messageHeader{},
Client: fakeReadWriter{
Reader: io.MultiReader(
bytes.NewReader([]byte{0, 0, 0, 0}), // flags int32 before collection name
bytes.NewReader(adminCollectionName),
bytes.NewReader(
[]byte{
0, 0, 0, 0, // numberToSkip int32
0, 0, 0, 0, // numberToReturn int32
1, // partial bson document length header
}),
),
},
Error: "EOF",
},
{
Name: "error while unmarshaling query document",
Header: &messageHeader{},
Client: fakeReadWriter{
Reader: io.MultiReader(
bytes.NewReader([]byte{0, 0, 0, 0}), // flags int32 before collection name
bytes.NewReader(adminCollectionName),
bytes.NewReader(
[]byte{
0, 0, 0, 0, // numberToSkip int32
0, 0, 0, 0, // numberToReturn int32
5, 0, 0, 0, // bson document length header
1, // bson document
}),
),
},
Error: "Document is corrupted",
},
}
for _, c := range cases {
err := p.Proxy(c.Header, c.Client, nil, nil)
if err == nil || !strings.Contains(err.Error(), c.Error) {
t.Fatalf("did not find expected error for %s, instead found %s", c.Name, err)
}
}
}