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package pagination
import (
"fmt"
"net/http"
"reflect"
"testing"
"github.com/mitchellh/mapstructure"
"github.com/rackspace/gophercloud/testhelper"
)
// LinkedPager sample and test cases.
type LinkedPageResult struct {
LinkedPageBase
}
func (r LinkedPageResult) IsEmpty() (bool, error) {
is, err := ExtractLinkedInts(r)
if err != nil {
return true, nil
}
return len(is) == 0, nil
}
func ExtractLinkedInts(page Page) ([]int, error) {
var response struct {
Ints []int `mapstructure:"ints"`
}
err := mapstructure.Decode(page.(LinkedPageResult).Body, &response)
if err != nil {
return nil, err
}
return response.Ints, nil
}
func createLinked(t *testing.T) Pager {
testhelper.SetupHTTP()
testhelper.Mux.HandleFunc("/page1", func(w http.ResponseWriter, r *http.Request) {
w.Header().Add("Content-Type", "application/json")
fmt.Fprintf(w, `{ "ints": [1, 2, 3], "links": { "next": "%s/page2" } }`, testhelper.Server.URL)
})
testhelper.Mux.HandleFunc("/page2", func(w http.ResponseWriter, r *http.Request) {
w.Header().Add("Content-Type", "application/json")
fmt.Fprintf(w, `{ "ints": [4, 5, 6], "links": { "next": "%s/page3" } }`, testhelper.Server.URL)
})
testhelper.Mux.HandleFunc("/page3", func(w http.ResponseWriter, r *http.Request) {
w.Header().Add("Content-Type", "application/json")
fmt.Fprintf(w, `{ "ints": [7, 8, 9], "links": { "next": null } }`)
})
client := createClient()
createPage := func(r PageResult) Page {
return LinkedPageResult{LinkedPageBase{PageResult: r}}
}
return NewPager(client, testhelper.Server.URL+"/page1", createPage)
}
func TestEnumerateLinked(t *testing.T) {
pager := createLinked(t)
defer testhelper.TeardownHTTP()
callCount := 0
err := pager.EachPage(func(page Page) (bool, error) {
actual, err := ExtractLinkedInts(page)
if err != nil {
return false, err
}
t.Logf("Handler invoked with %v", actual)
var expected []int
switch callCount {
case 0:
expected = []int{1, 2, 3}
case 1:
expected = []int{4, 5, 6}
case 2:
expected = []int{7, 8, 9}
default:
t.Fatalf("Unexpected call count: %d", callCount)
return false, nil
}
if !reflect.DeepEqual(expected, actual) {
t.Errorf("Call %d: Expected %#v, but was %#v", callCount, expected, actual)
}
callCount++
return true, nil
})
if err != nil {
t.Errorf("Unexpected error for page iteration: %v", err)
}
if callCount != 3 {
t.Errorf("Expected 3 calls, but was %d", callCount)
}
}
func TestAllPagesLinked(t *testing.T) {
pager := createLinked(t)
defer testhelper.TeardownHTTP()
page, err := pager.AllPages()
testhelper.AssertNoErr(t, err)
expected := []int{1, 2, 3, 4, 5, 6, 7, 8, 9}
actual, err := ExtractLinkedInts(page)
testhelper.AssertNoErr(t, err)
testhelper.CheckDeepEquals(t, expected, actual)
}
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