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// Copyright 2015 Google Inc. All Rights Reserved.
//
// 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
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package bigquery
import (
"errors"
"fmt"
"testing"
"cloud.google.com/go/internal/testutil"
"golang.org/x/net/context"
"google.golang.org/api/iterator"
)
type fetchResponse struct {
result *fetchPageResult // The result to return.
err error // The error to return.
}
// pageFetcherStub services fetch requests by returning data from an in-memory list of values.
type pageFetcherStub struct {
fetchResponses map[string]fetchResponse
err error
}
func (pf *pageFetcherStub) fetchPage(ctx context.Context, _ *Table, _ Schema, _ uint64, _ int64, pageToken string) (*fetchPageResult, error) {
call, ok := pf.fetchResponses[pageToken]
if !ok {
pf.err = fmt.Errorf("Unexpected page token: %q", pageToken)
}
return call.result, call.err
}
func TestIterator(t *testing.T) {
var (
iiSchema = Schema{
{Type: IntegerFieldType},
{Type: IntegerFieldType},
}
siSchema = Schema{
{Type: StringFieldType},
{Type: IntegerFieldType},
}
)
fetchFailure := errors.New("fetch failure")
testCases := []struct {
desc string
pageToken string
fetchResponses map[string]fetchResponse
want [][]Value
wantErr error
wantSchema Schema
wantTotalRows uint64
}{
{
desc: "Iteration over single empty page",
fetchResponses: map[string]fetchResponse{
"": {
result: &fetchPageResult{
pageToken: "",
rows: [][]Value{},
schema: Schema{},
},
},
},
want: [][]Value{},
wantSchema: Schema{},
},
{
desc: "Iteration over single page",
fetchResponses: map[string]fetchResponse{
"": {
result: &fetchPageResult{
pageToken: "",
rows: [][]Value{{1, 2}, {11, 12}},
schema: iiSchema,
totalRows: 4,
},
},
},
want: [][]Value{{1, 2}, {11, 12}},
wantSchema: iiSchema,
wantTotalRows: 4,
},
{
desc: "Iteration over single page with different schema",
fetchResponses: map[string]fetchResponse{
"": {
result: &fetchPageResult{
pageToken: "",
rows: [][]Value{{"1", 2}, {"11", 12}},
schema: siSchema,
},
},
},
want: [][]Value{{"1", 2}, {"11", 12}},
wantSchema: siSchema,
},
{
desc: "Iteration over two pages",
fetchResponses: map[string]fetchResponse{
"": {
result: &fetchPageResult{
pageToken: "a",
rows: [][]Value{{1, 2}, {11, 12}},
schema: iiSchema,
totalRows: 4,
},
},
"a": {
result: &fetchPageResult{
pageToken: "",
rows: [][]Value{{101, 102}, {111, 112}},
schema: iiSchema,
totalRows: 4,
},
},
},
want: [][]Value{{1, 2}, {11, 12}, {101, 102}, {111, 112}},
wantSchema: iiSchema,
wantTotalRows: 4,
},
{
desc: "Server response includes empty page",
fetchResponses: map[string]fetchResponse{
"": {
result: &fetchPageResult{
pageToken: "a",
rows: [][]Value{{1, 2}, {11, 12}},
schema: iiSchema,
},
},
"a": {
result: &fetchPageResult{
pageToken: "b",
rows: [][]Value{},
schema: iiSchema,
},
},
"b": {
result: &fetchPageResult{
pageToken: "",
rows: [][]Value{{101, 102}, {111, 112}},
schema: iiSchema,
},
},
},
want: [][]Value{{1, 2}, {11, 12}, {101, 102}, {111, 112}},
wantSchema: iiSchema,
},
{
desc: "Fetch error",
fetchResponses: map[string]fetchResponse{
"": {
result: &fetchPageResult{
pageToken: "a",
rows: [][]Value{{1, 2}, {11, 12}},
schema: iiSchema,
},
},
"a": {
// We returns some data from this fetch, but also an error.
// So the end result should include only data from the previous fetch.
err: fetchFailure,
result: &fetchPageResult{
pageToken: "b",
rows: [][]Value{{101, 102}, {111, 112}},
schema: iiSchema,
},
},
},
want: [][]Value{{1, 2}, {11, 12}},
wantErr: fetchFailure,
wantSchema: iiSchema,
},
{
desc: "Skip over an entire page",
pageToken: "a",
fetchResponses: map[string]fetchResponse{
"": {
result: &fetchPageResult{
pageToken: "a",
rows: [][]Value{{1, 2}, {11, 12}},
schema: iiSchema,
},
},
"a": {
result: &fetchPageResult{
pageToken: "",
rows: [][]Value{{101, 102}, {111, 112}},
schema: iiSchema,
},
},
},
want: [][]Value{{101, 102}, {111, 112}},
wantSchema: iiSchema,
},
{
desc: "Skip beyond all data",
pageToken: "b",
fetchResponses: map[string]fetchResponse{
"": {
result: &fetchPageResult{
pageToken: "a",
rows: [][]Value{{1, 2}, {11, 12}},
schema: iiSchema,
},
},
"a": {
result: &fetchPageResult{
pageToken: "b",
rows: [][]Value{{101, 102}, {111, 112}},
schema: iiSchema,
},
},
"b": {
result: &fetchPageResult{},
},
},
// In this test case, Next will return false on its first call,
// so we won't even attempt to call Get.
want: [][]Value{},
wantSchema: Schema{},
},
}
for _, tc := range testCases {
pf := &pageFetcherStub{
fetchResponses: tc.fetchResponses,
}
it := newRowIterator(context.Background(), nil, pf.fetchPage)
it.PageInfo().Token = tc.pageToken
values, schema, totalRows, err := consumeRowIterator(it)
if err != tc.wantErr {
t.Fatalf("%s: got %v, want %v", tc.desc, err, tc.wantErr)
}
if (len(values) != 0 || len(tc.want) != 0) && !testutil.Equal(values, tc.want) {
t.Errorf("%s: values:\ngot: %v\nwant:%v", tc.desc, values, tc.want)
}
if (len(schema) != 0 || len(tc.wantSchema) != 0) && !testutil.Equal(schema, tc.wantSchema) {
t.Errorf("%s: iterator.Schema:\ngot: %v\nwant: %v", tc.desc, schema, tc.wantSchema)
}
if totalRows != tc.wantTotalRows {
t.Errorf("%s: totalRows: got %d, want %d", tc.desc, totalRows, tc.wantTotalRows)
}
}
}
// consumeRowIterator reads the schema and all values from a RowIterator and returns them.
func consumeRowIterator(it *RowIterator) ([][]Value, Schema, uint64, error) {
var (
got [][]Value
schema Schema
totalRows uint64
)
for {
var vls []Value
err := it.Next(&vls)
if err == iterator.Done {
return got, schema, totalRows, nil
}
if err != nil {
return got, schema, totalRows, err
}
got = append(got, vls)
schema = it.Schema
totalRows = it.TotalRows
}
}
func TestNextDuringErrorState(t *testing.T) {
pf := &pageFetcherStub{
fetchResponses: map[string]fetchResponse{
"": {err: errors.New("bang")},
},
}
it := newRowIterator(context.Background(), nil, pf.fetchPage)
var vals []Value
if err := it.Next(&vals); err == nil {
t.Errorf("Expected error after calling Next")
}
if err := it.Next(&vals); err == nil {
t.Errorf("Expected error calling Next again when iterator has a non-nil error.")
}
}
func TestNextAfterFinished(t *testing.T) {
testCases := []struct {
fetchResponses map[string]fetchResponse
want [][]Value
}{
{
fetchResponses: map[string]fetchResponse{
"": {
result: &fetchPageResult{
pageToken: "",
rows: [][]Value{{1, 2}, {11, 12}},
},
},
},
want: [][]Value{{1, 2}, {11, 12}},
},
{
fetchResponses: map[string]fetchResponse{
"": {
result: &fetchPageResult{
pageToken: "",
rows: [][]Value{},
},
},
},
want: [][]Value{},
},
}
for _, tc := range testCases {
pf := &pageFetcherStub{
fetchResponses: tc.fetchResponses,
}
it := newRowIterator(context.Background(), nil, pf.fetchPage)
values, _, _, err := consumeRowIterator(it)
if err != nil {
t.Fatal(err)
}
if (len(values) != 0 || len(tc.want) != 0) && !testutil.Equal(values, tc.want) {
t.Errorf("values: got:\n%v\nwant:\n%v", values, tc.want)
}
// Try calling Get again.
var vals []Value
if err := it.Next(&vals); err != iterator.Done {
t.Errorf("Expected Done calling Next when there are no more values")
}
}
}
func TestIteratorNextTypes(t *testing.T) {
it := newRowIterator(context.Background(), nil, nil)
for _, v := range []interface{}{3, "s", []int{}, &[]int{},
map[string]Value{}, &map[string]interface{}{},
struct{}{},
} {
if err := it.Next(v); err == nil {
t.Errorf("%v: want error, got nil", v)
}
}
}
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