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// Copyright 2015 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package bigquery
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import (
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"errors"
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"testing"
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"github.com/google/go-cmp/cmp"
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"cloud.google.com/go/internal/testutil"
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"golang.org/x/net/context"
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bq "google.golang.org/api/bigquery/v2"
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"google.golang.org/api/iterator"
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)
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type pageFetcherArgs struct {
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table *Table
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schema Schema
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startIndex uint64
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pageSize int64
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pageToken string
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}
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// pageFetcherReadStub services read requests by returning data from an in-memory list of values.
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type pageFetcherReadStub struct {
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// values and pageTokens are used as sources of data to return in response to calls to readTabledata or readQuery.
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values [][][]Value // contains pages / rows / columns.
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pageTokens map[string]string // maps incoming page token to returned page token.
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// arguments are recorded for later inspection.
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calls []pageFetcherArgs
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}
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func (s *pageFetcherReadStub) fetchPage(ctx context.Context, t *Table, schema Schema, startIndex uint64, pageSize int64, pageToken string) (*fetchPageResult, error) {
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s.calls = append(s.calls,
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pageFetcherArgs{t, schema, startIndex, pageSize, pageToken})
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result := &fetchPageResult{
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pageToken: s.pageTokens[pageToken],
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rows: s.values[0],
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}
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s.values = s.values[1:]
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return result, nil
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}
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func waitForQueryStub(context.Context, string) (Schema, error) {
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return nil, nil
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}
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func TestRead(t *testing.T) {
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// The data for the service stub to return is populated for each test case in the testCases for loop.
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ctx := context.Background()
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c := &Client{projectID: "project-id"}
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pf := &pageFetcherReadStub{}
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queryJob := &Job{
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projectID: "project-id",
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jobID: "job-id",
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c: c,
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config: &bq.JobConfiguration{
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Query: &bq.JobConfigurationQuery{
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DestinationTable: &bq.TableReference{
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ProjectId: "project-id",
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DatasetId: "dataset-id",
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TableId: "table-id",
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},
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},
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},
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}
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for _, readFunc := range []func() *RowIterator{
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func() *RowIterator {
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return c.Dataset("dataset-id").Table("table-id").read(ctx, pf.fetchPage)
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},
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func() *RowIterator {
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it, err := queryJob.read(ctx, waitForQueryStub, pf.fetchPage)
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if err != nil {
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t.Fatal(err)
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}
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return it
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},
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} {
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testCases := []struct {
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data [][][]Value
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pageTokens map[string]string
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want [][]Value
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}{
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{
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data: [][][]Value{{{1, 2}, {11, 12}}, {{30, 40}, {31, 41}}},
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pageTokens: map[string]string{"": "a", "a": ""},
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want: [][]Value{{1, 2}, {11, 12}, {30, 40}, {31, 41}},
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},
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{
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data: [][][]Value{{{1, 2}, {11, 12}}, {{30, 40}, {31, 41}}},
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pageTokens: map[string]string{"": ""}, // no more pages after first one.
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want: [][]Value{{1, 2}, {11, 12}},
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},
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}
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for _, tc := range testCases {
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pf.values = tc.data
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pf.pageTokens = tc.pageTokens
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if got, ok := collectValues(t, readFunc()); ok {
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if !testutil.Equal(got, tc.want) {
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t.Errorf("reading: got:\n%v\nwant:\n%v", got, tc.want)
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}
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}
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}
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}
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}
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func collectValues(t *testing.T, it *RowIterator) ([][]Value, bool) {
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var got [][]Value
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for {
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var vals []Value
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err := it.Next(&vals)
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if err == iterator.Done {
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break
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}
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if err != nil {
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t.Errorf("err calling Next: %v", err)
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return nil, false
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}
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got = append(got, vals)
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}
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return got, true
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}
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func TestNoMoreValues(t *testing.T) {
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c := &Client{projectID: "project-id"}
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pf := &pageFetcherReadStub{
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values: [][][]Value{{{1, 2}, {11, 12}}},
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}
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it := c.Dataset("dataset-id").Table("table-id").read(context.Background(), pf.fetchPage)
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var vals []Value
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// We expect to retrieve two values and then fail on the next attempt.
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if err := it.Next(&vals); err != nil {
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t.Fatalf("Next: got: %v: want: nil", err)
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}
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if err := it.Next(&vals); err != nil {
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t.Fatalf("Next: got: %v: want: nil", err)
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}
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if err := it.Next(&vals); err != iterator.Done {
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t.Fatalf("Next: got: %v: want: iterator.Done", err)
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}
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}
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var errBang = errors.New("bang!")
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func errorFetchPage(context.Context, *Table, Schema, uint64, int64, string) (*fetchPageResult, error) {
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return nil, errBang
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}
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func TestReadError(t *testing.T) {
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// test that service read errors are propagated back to the caller.
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c := &Client{projectID: "project-id"}
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it := c.Dataset("dataset-id").Table("table-id").read(context.Background(), errorFetchPage)
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var vals []Value
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if err := it.Next(&vals); err != errBang {
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t.Fatalf("Get: got: %v: want: %v", err, errBang)
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}
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}
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func TestReadTabledataOptions(t *testing.T) {
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// test that read options are propagated.
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s := &pageFetcherReadStub{
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values: [][][]Value{{{1, 2}}},
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}
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c := &Client{projectID: "project-id"}
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tr := c.Dataset("dataset-id").Table("table-id")
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it := tr.read(context.Background(), s.fetchPage)
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it.PageInfo().MaxSize = 5
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var vals []Value
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if err := it.Next(&vals); err != nil {
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t.Fatal(err)
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}
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want := []pageFetcherArgs{{
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table: tr,
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pageSize: 5,
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pageToken: "",
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}}
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if diff := testutil.Diff(s.calls, want, cmp.AllowUnexported(pageFetcherArgs{}, pageFetcherReadStub{}, Table{}, Client{})); diff != "" {
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t.Errorf("reading (got=-, want=+):\n%s", diff)
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}
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}
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func TestReadQueryOptions(t *testing.T) {
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// test that read options are propagated.
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c := &Client{projectID: "project-id"}
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pf := &pageFetcherReadStub{
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values: [][][]Value{{{1, 2}}},
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}
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tr := &bq.TableReference{
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ProjectId: "project-id",
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DatasetId: "dataset-id",
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TableId: "table-id",
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}
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queryJob := &Job{
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projectID: "project-id",
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jobID: "job-id",
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c: c,
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config: &bq.JobConfiguration{
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Query: &bq.JobConfigurationQuery{DestinationTable: tr},
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},
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}
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it, err := queryJob.read(context.Background(), waitForQueryStub, pf.fetchPage)
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if err != nil {
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t.Fatalf("err calling Read: %v", err)
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}
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it.PageInfo().MaxSize = 5
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var vals []Value
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if err := it.Next(&vals); err != nil {
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t.Fatalf("Next: got: %v: want: nil", err)
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}
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want := []pageFetcherArgs{{
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table: bqToTable(tr, c),
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pageSize: 5,
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pageToken: "",
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}}
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if !testutil.Equal(pf.calls, want, cmp.AllowUnexported(pageFetcherArgs{}, Table{}, Client{})) {
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t.Errorf("reading: got:\n%v\nwant:\n%v", pf.calls, want)
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}
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}
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Reference in New Issue
Block a user