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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"
"reflect"
"testing"
"golang.org/x/net/context"
)
type readTabledataArgs struct {
conf *readTableConf
tok string
}
type readQueryArgs struct {
conf *readQueryConf
tok string
}
// readServiceStub services read requests by returning data from an in-memory list of values.
type readServiceStub 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.
readTabledataCalls []readTabledataArgs
readQueryCalls []readQueryArgs
service
}
func (s *readServiceStub) readValues(tok string) *readDataResult {
result := &readDataResult{
pageToken: s.pageTokens[tok],
rows: s.values[0],
}
s.values = s.values[1:]
return result
}
func (s *readServiceStub) readTabledata(ctx context.Context, conf *readTableConf, token string) (*readDataResult, error) {
s.readTabledataCalls = append(s.readTabledataCalls, readTabledataArgs{conf, token})
return s.readValues(token), nil
}
func (s *readServiceStub) readQuery(ctx context.Context, conf *readQueryConf, token string) (*readDataResult, error) {
s.readQueryCalls = append(s.readQueryCalls, readQueryArgs{conf, token})
return s.readValues(token), 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.
service := &readServiceStub{}
c := &Client{
service: service,
}
queryJob := &Job{
projectID: "project-id",
jobID: "job-id",
service: service,
isQuery: true,
}
for _, src := range []ReadSource{defaultTable(service), queryJob} {
testCases := []struct {
data [][][]Value
pageTokens map[string]string
want []ValueList
}{
{
data: [][][]Value{{{1, 2}, {11, 12}}, {{30, 40}, {31, 41}}},
pageTokens: map[string]string{"": "a", "a": ""},
want: []ValueList{{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: []ValueList{{1, 2}, {11, 12}},
},
}
for _, tc := range testCases {
service.values = tc.data
service.pageTokens = tc.pageTokens
if got, ok := doRead(t, c, src); ok {
if !reflect.DeepEqual(got, tc.want) {
t.Errorf("reading: got:\n%v\nwant:\n%v", got, tc.want)
}
}
}
}
}
// doRead calls Read with a ReadSource. Get is repeatedly called on the Iterator returned by Read and the results are returned.
func doRead(t *testing.T, c *Client, src ReadSource) ([]ValueList, bool) {
it, err := c.Read(context.Background(), src)
if err != nil {
t.Errorf("err calling Read: %v", err)
return nil, false
}
var got []ValueList
for it.Next(context.Background()) {
var vals ValueList
if err := it.Get(&vals); err != nil {
t.Errorf("err calling Get: %v", err)
return nil, false
} else {
got = append(got, vals)
}
}
return got, true
}
func TestNoMoreValues(t *testing.T) {
c := &Client{
service: &readServiceStub{
values: [][][]Value{{{1, 2}, {11, 12}}},
},
}
it, err := c.Read(context.Background(), defaultTable(c.service))
if err != nil {
t.Fatalf("err calling Read: %v", err)
}
var vals ValueList
// We expect to retrieve two values and then fail on the next attempt.
if !it.Next(context.Background()) {
t.Fatalf("Next: got: false: want: true")
}
if !it.Next(context.Background()) {
t.Fatalf("Next: got: false: want: true")
}
if err := it.Get(&vals); err != nil {
t.Fatalf("Get: got: %v: want: nil", err)
}
if it.Next(context.Background()) {
t.Fatalf("Next: got: true: want: false")
}
if err := it.Get(&vals); err == nil {
t.Fatalf("Get: got: %v: want: non-nil", err)
}
}
// delayedReadStub simulates reading results from a query that has not yet
// completed. Its readQuery method initially reports that the query job is not
// yet complete. Subsequently, it proxies the request through to another
// service stub.
type delayedReadStub struct {
numDelays int
readServiceStub
}
func (s *delayedReadStub) readQuery(ctx context.Context, conf *readQueryConf, token string) (*readDataResult, error) {
if s.numDelays > 0 {
s.numDelays--
return nil, errIncompleteJob
}
return s.readServiceStub.readQuery(ctx, conf, token)
}
// TestIncompleteJob tests that an Iterator which reads from a query job will block until the job is complete.
func TestIncompleteJob(t *testing.T) {
service := &delayedReadStub{
numDelays: 2,
readServiceStub: readServiceStub{
values: [][][]Value{{{1, 2}}},
},
}
c := &Client{service: service}
queryJob := &Job{
projectID: "project-id",
jobID: "job-id",
service: service,
isQuery: true,
}
it, err := c.Read(context.Background(), queryJob)
if err != nil {
t.Fatalf("err calling Read: %v", err)
}
var got ValueList
want := ValueList{1, 2}
if !it.Next(context.Background()) {
t.Fatalf("Next: got: false: want: true")
}
if err := it.Get(&got); err != nil {
t.Fatalf("Error calling Get: %v", err)
}
if service.numDelays != 0 {
t.Errorf("remaining numDelays : got: %v want:0", service.numDelays)
}
if !reflect.DeepEqual(got, want) {
t.Errorf("reading: got:\n%v\nwant:\n%v", got, want)
}
}
type errorReadService struct {
service
}
func (s *errorReadService) readTabledata(ctx context.Context, conf *readTableConf, token string) (*readDataResult, error) {
return nil, errors.New("bang!")
}
func TestReadError(t *testing.T) {
// test that service read errors are propagated back to the caller.
c := &Client{service: &errorReadService{}}
it, err := c.Read(context.Background(), defaultTable(c.service))
if err != nil {
// Read should not return an error; only Err should.
t.Fatalf("err calling Read: %v", err)
}
if it.Next(context.Background()) {
t.Fatalf("Next: got: true: want: false")
}
if err := it.Err(); err.Error() != "bang!" {
t.Fatalf("Get: got: %v: want: bang!", err)
}
}
func TestReadTabledataOptions(t *testing.T) {
// test that read options are propagated.
s := &readServiceStub{
values: [][][]Value{{{1, 2}}},
}
c := &Client{service: s}
it, err := c.Read(context.Background(), defaultTable(s), RecordsPerRequest(5))
if err != nil {
t.Fatalf("err calling Read: %v", err)
}
if !it.Next(context.Background()) {
t.Fatalf("Next: got: false: want: true")
}
want := []readTabledataArgs{{
conf: &readTableConf{
projectID: "project-id",
datasetID: "dataset-id",
tableID: "table-id",
paging: pagingConf{
recordsPerRequest: 5,
setRecordsPerRequest: true,
},
},
tok: "",
}}
if !reflect.DeepEqual(s.readTabledataCalls, want) {
t.Errorf("reading: got:\n%v\nwant:\n%v", s.readTabledataCalls, want)
}
}
func TestReadQueryOptions(t *testing.T) {
// test that read options are propagated.
s := &readServiceStub{
values: [][][]Value{{{1, 2}}},
}
c := &Client{service: s}
queryJob := &Job{
projectID: "project-id",
jobID: "job-id",
service: s,
isQuery: true,
}
it, err := c.Read(context.Background(), queryJob, RecordsPerRequest(5))
if err != nil {
t.Fatalf("err calling Read: %v", err)
}
if !it.Next(context.Background()) {
t.Fatalf("Next: got: false: want: true")
}
want := []readQueryArgs{{
conf: &readQueryConf{
projectID: "project-id",
jobID: "job-id",
paging: pagingConf{
recordsPerRequest: 5,
setRecordsPerRequest: true,
},
},
tok: "",
}}
if !reflect.DeepEqual(s.readQueryCalls, want) {
t.Errorf("reading: got:\n%v\nwant:\n%v", s.readQueryCalls, want)
}
}