// 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"
"testing"
"github.com/google/go-cmp/cmp"
"cloud.google.com/go/internal/testutil"
"golang.org/x/net/context"
bq "google.golang.org/api/bigquery/v2"
"google.golang.org/api/iterator"
)
type pageFetcherArgs struct {
table *Table
schema Schema
startIndex uint64
pageSize int64
pageToken string
}
// pageFetcherReadStub services read requests by returning data from an in-memory list of values.
type pageFetcherReadStub struct {
// values and pageTokens are used as sources of data to return in response to calls to readTabledata or readQuery.
values [][][]Value // contains pages / rows / columns.
pageTokens map[string]string // maps incoming page token to returned page token.
// arguments are recorded for later inspection.
calls []pageFetcherArgs
}
func (s *pageFetcherReadStub) fetchPage(ctx context.Context, t *Table, schema Schema, startIndex uint64, pageSize int64, pageToken string) (*fetchPageResult, error) {
s.calls = append(s.calls,
pageFetcherArgs{t, schema, startIndex, pageSize, pageToken})
result := &fetchPageResult{
pageToken: s.pageTokens[pageToken],
rows: s.values[0],
}
s.values = s.values[1:]
return result, nil
}
func waitForQueryStub(context.Context, string) (Schema, error) {
return nil, nil
}
func TestRead(t *testing.T) {
// The data for the service stub to return is populated for each test case in the testCases for loop.
ctx := context.Background()
c := &Client{projectID: "project-id"}
pf := &pageFetcherReadStub{}
queryJob := &Job{
projectID: "project-id",
jobID: "job-id",
c: c,
config: &bq.JobConfiguration{
Query: &bq.JobConfigurationQuery{
DestinationTable: &bq.TableReference{
ProjectId: "project-id",
DatasetId: "dataset-id",
TableId: "table-id",
},
},
},
}
for _, readFunc := range []func() *RowIterator{
func() *RowIterator {
return c.Dataset("dataset-id").Table("table-id").read(ctx, pf.fetchPage)
},
func() *RowIterator {
it, err := queryJob.read(ctx, waitForQueryStub, pf.fetchPage)
if err != nil {
t.Fatal(err)
}
return it
},
} {
testCases := []struct {
data [][][]Value
pageTokens map[string]string
want [][]Value
}{
{
data: [][][]Value{{{1, 2}, {11, 12}}, {{30, 40}, {31, 41}}},
pageTokens: map[string]string{"": "a", "a": ""},
want: [][]Value{{1, 2}, {11, 12}, {30, 40}, {31, 41}},
},
{
data: [][][]Value{{{1, 2}, {11, 12}}, {{30, 40}, {31, 41}}},
pageTokens: map[string]string{"": ""}, // no more pages after first one.
want: [][]Value{{1, 2}, {11, 12}},
},
}
for _, tc := range testCases {
pf.values = tc.data
pf.pageTokens = tc.pageTokens
if got, ok := collectValues(t, readFunc()); ok {
if !testutil.Equal(got, tc.want) {
t.Errorf("reading: got:\n%v\nwant:\n%v", got, tc.want)
}
}
}
}
}
func collectValues(t *testing.T, it *RowIterator) ([][]Value, bool) {
var got [][]Value
for {
var vals []Value
err := it.Next(&vals)
if err == iterator.Done {
break
}
if err != nil {
t.Errorf("err calling Next: %v", err)
return nil, false
}
got = append(got, vals)
}
return got, true
}
func TestNoMoreValues(t *testing.T) {
c := &Client{projectID: "project-id"}
pf := &pageFetcherReadStub{
values: [][][]Value{{{1, 2}, {11, 12}}},
}
it := c.Dataset("dataset-id").Table("table-id").read(context.Background(), pf.fetchPage)
var vals []Value
// We expect to retrieve two values and then fail on the next attempt.
if err := it.Next(&vals); err != nil {
t.Fatalf("Next: got: %v: want: nil", err)
}
if err := it.Next(&vals); err != nil {
t.Fatalf("Next: got: %v: want: nil", err)
}
if err := it.Next(&vals); err != iterator.Done {
t.Fatalf("Next: got: %v: want: iterator.Done", err)
}
}
var errBang = errors.New("bang!")
func errorFetchPage(context.Context, *Table, Schema, uint64, int64, string) (*fetchPageResult, error) {
return nil, errBang
}
func TestReadError(t *testing.T) {
// test that service read errors are propagated back to the caller.
c := &Client{projectID: "project-id"}
it := c.Dataset("dataset-id").Table("table-id").read(context.Background(), errorFetchPage)
var vals []Value
if err := it.Next(&vals); err != errBang {
t.Fatalf("Get: got: %v: want: %v", err, errBang)
}
}
func TestReadTabledataOptions(t *testing.T) {
// test that read options are propagated.
s := &pageFetcherReadStub{
values: [][][]Value{{{1, 2}}},
}
c := &Client{projectID: "project-id"}
tr := c.Dataset("dataset-id").Table("table-id")
it := tr.read(context.Background(), s.fetchPage)
it.PageInfo().MaxSize = 5
var vals []Value
if err := it.Next(&vals); err != nil {
t.Fatal(err)
}
want := []pageFetcherArgs{{
table: tr,
pageSize: 5,
pageToken: "",
}}
if diff := testutil.Diff(s.calls, want, cmp.AllowUnexported(pageFetcherArgs{}, pageFetcherReadStub{}, Table{}, Client{})); diff != "" {
t.Errorf("reading (got=-, want=+):\n%s", diff)
}
}
func TestReadQueryOptions(t *testing.T) {
// test that read options are propagated.
c := &Client{projectID: "project-id"}
pf := &pageFetcherReadStub{
values: [][][]Value{{{1, 2}}},
}
tr := &bq.TableReference{
ProjectId: "project-id",
DatasetId: "dataset-id",
TableId: "table-id",
}
queryJob := &Job{
projectID: "project-id",
jobID: "job-id",
c: c,
config: &bq.JobConfiguration{
Query: &bq.JobConfigurationQuery{DestinationTable: tr},
},
}
it, err := queryJob.read(context.Background(), waitForQueryStub, pf.fetchPage)
if err != nil {
t.Fatalf("err calling Read: %v", err)
}
it.PageInfo().MaxSize = 5
var vals []Value
if err := it.Next(&vals); err != nil {
t.Fatalf("Next: got: %v: want: nil", err)
}
want := []pageFetcherArgs{{
table: bqToTable(tr, c),
pageSize: 5,
pageToken: "",
}}
if !testutil.Equal(pf.calls, want, cmp.AllowUnexported(pageFetcherArgs{}, Table{}, Client{})) {
t.Errorf("reading: got:\n%v\nwant:\n%v", pf.calls, want)
}
}