mirror of
https://github.com/octoleo/restic.git
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362 lines
8.7 KiB
Go
362 lines
8.7 KiB
Go
// 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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"fmt"
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"testing"
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"cloud.google.com/go/internal/testutil"
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"golang.org/x/net/context"
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"google.golang.org/api/iterator"
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)
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type fetchResponse struct {
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result *fetchPageResult // The result to return.
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err error // The error to return.
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}
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// pageFetcherStub services fetch requests by returning data from an in-memory list of values.
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type pageFetcherStub struct {
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fetchResponses map[string]fetchResponse
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err error
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}
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func (pf *pageFetcherStub) fetchPage(ctx context.Context, _ *Table, _ Schema, _ uint64, _ int64, pageToken string) (*fetchPageResult, error) {
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call, ok := pf.fetchResponses[pageToken]
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if !ok {
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pf.err = fmt.Errorf("Unexpected page token: %q", pageToken)
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}
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return call.result, call.err
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}
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func TestIterator(t *testing.T) {
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var (
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iiSchema = Schema{
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{Type: IntegerFieldType},
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{Type: IntegerFieldType},
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}
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siSchema = Schema{
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{Type: StringFieldType},
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{Type: IntegerFieldType},
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}
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)
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fetchFailure := errors.New("fetch failure")
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testCases := []struct {
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desc string
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pageToken string
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fetchResponses map[string]fetchResponse
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want [][]Value
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wantErr error
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wantSchema Schema
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}{
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{
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desc: "Iteration over single empty page",
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fetchResponses: map[string]fetchResponse{
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"": {
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result: &fetchPageResult{
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pageToken: "",
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rows: [][]Value{},
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schema: Schema{},
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},
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},
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},
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want: [][]Value{},
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wantSchema: Schema{},
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},
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{
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desc: "Iteration over single page",
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fetchResponses: map[string]fetchResponse{
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"": {
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result: &fetchPageResult{
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pageToken: "",
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rows: [][]Value{{1, 2}, {11, 12}},
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schema: iiSchema,
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},
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},
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},
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want: [][]Value{{1, 2}, {11, 12}},
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wantSchema: iiSchema,
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},
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{
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desc: "Iteration over single page with different schema",
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fetchResponses: map[string]fetchResponse{
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"": {
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result: &fetchPageResult{
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pageToken: "",
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rows: [][]Value{{"1", 2}, {"11", 12}},
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schema: siSchema,
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},
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},
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},
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want: [][]Value{{"1", 2}, {"11", 12}},
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wantSchema: siSchema,
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},
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{
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desc: "Iteration over two pages",
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fetchResponses: map[string]fetchResponse{
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"": {
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result: &fetchPageResult{
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pageToken: "a",
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rows: [][]Value{{1, 2}, {11, 12}},
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schema: iiSchema,
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},
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},
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"a": {
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result: &fetchPageResult{
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pageToken: "",
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rows: [][]Value{{101, 102}, {111, 112}},
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schema: iiSchema,
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},
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},
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},
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want: [][]Value{{1, 2}, {11, 12}, {101, 102}, {111, 112}},
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wantSchema: iiSchema,
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},
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{
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desc: "Server response includes empty page",
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fetchResponses: map[string]fetchResponse{
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"": {
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result: &fetchPageResult{
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pageToken: "a",
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rows: [][]Value{{1, 2}, {11, 12}},
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schema: iiSchema,
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},
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},
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"a": {
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result: &fetchPageResult{
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pageToken: "b",
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rows: [][]Value{},
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schema: iiSchema,
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},
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},
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"b": {
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result: &fetchPageResult{
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pageToken: "",
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rows: [][]Value{{101, 102}, {111, 112}},
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schema: iiSchema,
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},
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},
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},
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want: [][]Value{{1, 2}, {11, 12}, {101, 102}, {111, 112}},
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wantSchema: iiSchema,
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},
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{
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desc: "Fetch error",
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fetchResponses: map[string]fetchResponse{
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"": {
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result: &fetchPageResult{
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pageToken: "a",
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rows: [][]Value{{1, 2}, {11, 12}},
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schema: iiSchema,
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},
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},
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"a": {
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// We returns some data from this fetch, but also an error.
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// So the end result should include only data from the previous fetch.
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err: fetchFailure,
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result: &fetchPageResult{
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pageToken: "b",
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rows: [][]Value{{101, 102}, {111, 112}},
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schema: iiSchema,
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},
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},
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},
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want: [][]Value{{1, 2}, {11, 12}},
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wantErr: fetchFailure,
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wantSchema: iiSchema,
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},
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{
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desc: "Skip over an entire page",
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pageToken: "a",
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fetchResponses: map[string]fetchResponse{
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"": {
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result: &fetchPageResult{
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pageToken: "a",
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rows: [][]Value{{1, 2}, {11, 12}},
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schema: iiSchema,
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},
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},
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"a": {
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result: &fetchPageResult{
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pageToken: "",
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rows: [][]Value{{101, 102}, {111, 112}},
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schema: iiSchema,
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},
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},
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},
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want: [][]Value{{101, 102}, {111, 112}},
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wantSchema: iiSchema,
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},
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{
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desc: "Skip beyond all data",
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pageToken: "b",
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fetchResponses: map[string]fetchResponse{
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"": {
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result: &fetchPageResult{
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pageToken: "a",
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rows: [][]Value{{1, 2}, {11, 12}},
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schema: iiSchema,
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},
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},
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"a": {
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result: &fetchPageResult{
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pageToken: "b",
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rows: [][]Value{{101, 102}, {111, 112}},
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schema: iiSchema,
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},
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},
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"b": {
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result: &fetchPageResult{},
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},
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},
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// In this test case, Next will return false on its first call,
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// so we won't even attempt to call Get.
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want: [][]Value{},
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wantSchema: Schema{},
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},
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}
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for _, tc := range testCases {
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pf := &pageFetcherStub{
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fetchResponses: tc.fetchResponses,
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}
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it := newRowIterator(context.Background(), nil, pf.fetchPage)
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it.PageInfo().Token = tc.pageToken
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values, schema, err := consumeRowIterator(it)
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if err != tc.wantErr {
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t.Fatalf("%s: got %v, want %v", tc.desc, err, tc.wantErr)
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}
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if (len(values) != 0 || len(tc.want) != 0) && !testutil.Equal(values, tc.want) {
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t.Errorf("%s: values:\ngot: %v\nwant:%v", tc.desc, values, tc.want)
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}
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if (len(schema) != 0 || len(tc.wantSchema) != 0) && !testutil.Equal(schema, tc.wantSchema) {
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t.Errorf("%s: iterator.Schema:\ngot: %v\nwant: %v", tc.desc, schema, tc.wantSchema)
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}
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}
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}
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type valueListWithSchema struct {
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vals valueList
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schema Schema
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}
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func (v *valueListWithSchema) Load(vs []Value, s Schema) error {
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v.vals.Load(vs, s)
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v.schema = s
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return nil
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}
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// consumeRowIterator reads the schema and all values from a RowIterator and returns them.
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func consumeRowIterator(it *RowIterator) ([][]Value, Schema, error) {
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var got [][]Value
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var schema Schema
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for {
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var vls valueListWithSchema
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err := it.Next(&vls)
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if err == iterator.Done {
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return got, schema, nil
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}
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if err != nil {
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return got, schema, err
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}
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got = append(got, vls.vals)
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schema = vls.schema
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}
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}
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func TestNextDuringErrorState(t *testing.T) {
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pf := &pageFetcherStub{
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fetchResponses: map[string]fetchResponse{
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"": {err: errors.New("bang")},
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},
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}
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it := newRowIterator(context.Background(), nil, pf.fetchPage)
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var vals []Value
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if err := it.Next(&vals); err == nil {
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t.Errorf("Expected error after calling Next")
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}
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if err := it.Next(&vals); err == nil {
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t.Errorf("Expected error calling Next again when iterator has a non-nil error.")
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}
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}
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func TestNextAfterFinished(t *testing.T) {
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testCases := []struct {
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fetchResponses map[string]fetchResponse
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want [][]Value
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}{
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{
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fetchResponses: map[string]fetchResponse{
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"": {
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result: &fetchPageResult{
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pageToken: "",
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rows: [][]Value{{1, 2}, {11, 12}},
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},
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},
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},
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want: [][]Value{{1, 2}, {11, 12}},
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},
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{
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fetchResponses: map[string]fetchResponse{
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"": {
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result: &fetchPageResult{
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pageToken: "",
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rows: [][]Value{},
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},
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},
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},
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want: [][]Value{},
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},
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}
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for _, tc := range testCases {
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pf := &pageFetcherStub{
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fetchResponses: tc.fetchResponses,
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}
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it := newRowIterator(context.Background(), nil, pf.fetchPage)
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values, _, err := consumeRowIterator(it)
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if err != nil {
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t.Fatal(err)
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}
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if (len(values) != 0 || len(tc.want) != 0) && !testutil.Equal(values, tc.want) {
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t.Errorf("values: got:\n%v\nwant:\n%v", values, tc.want)
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}
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// Try calling Get again.
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var vals []Value
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if err := it.Next(&vals); err != iterator.Done {
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t.Errorf("Expected Done calling Next when there are no more values")
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}
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}
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}
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func TestIteratorNextTypes(t *testing.T) {
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it := newRowIterator(context.Background(), nil, nil)
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for _, v := range []interface{}{3, "s", []int{}, &[]int{},
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map[string]Value{}, &map[string]interface{}{},
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struct{}{},
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} {
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if err := it.Next(v); err == nil {
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t.Error("%v: want error, got nil", v)
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}
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}
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}
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