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136 lines
3.1 KiB
Go
136 lines
3.1 KiB
Go
package client_test
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import (
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"errors"
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"io/ioutil"
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"net/http"
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"sort"
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"strings"
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"testing"
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"github.com/grafana/grafana/pkg/tsdb/prometheus/client"
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"github.com/stretchr/testify/require"
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)
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func TestCache_GetClient(t *testing.T) {
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t.Run("it caches the client for a set of auth headers", func(t *testing.T) {
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tc := setupCacheContext()
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c, err := tc.providerCache.GetClient(headers)
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require.Nil(t, err)
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c2, err := tc.providerCache.GetClient(headers)
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require.Nil(t, err)
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require.Equal(t, c, c2)
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require.Equal(t, 1, tc.clientProvider.numCalls)
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})
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t.Run("it returns different clients when the headers differ", func(t *testing.T) {
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tc := setupCacheContext()
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h1 := map[string]string{"Authorization": "token", "X-ID-Token": "id-token"}
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h2 := map[string]string{"Authorization": "token2", "X-ID-Token": "id-token"}
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c, err := tc.providerCache.GetClient(h1)
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require.Nil(t, err)
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c2, err := tc.providerCache.GetClient(h2)
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require.Nil(t, err)
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require.NotEqual(t, c, c2)
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require.Equal(t, 2, tc.clientProvider.numCalls)
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})
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t.Run("it returns from the cache when headers are the same", func(t *testing.T) {
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tc := setupCacheContext()
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h1 := map[string]string{"Authorization": "token", "X-ID-Token": "id-token"}
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h2 := map[string]string{"Authorization": "token", "X-ID-Token": "id-token"}
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c, err := tc.providerCache.GetClient(h1)
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require.Nil(t, err)
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c2, err := tc.providerCache.GetClient(h2)
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require.Nil(t, err)
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require.Equal(t, c, c2)
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require.Equal(t, 1, tc.clientProvider.numCalls)
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})
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t.Run("it doesn't cache anything when an error occurs", func(t *testing.T) {
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tc := setupCacheContext()
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tc.clientProvider.errors <- errors.New("something bad")
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_, err := tc.providerCache.GetClient(headers)
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require.EqualError(t, err, "something bad")
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c, err := tc.providerCache.GetClient(headers)
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require.Nil(t, err)
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require.NotNil(t, c)
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require.Equal(t, 2, tc.clientProvider.numCalls)
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})
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}
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type cacheTestContext struct {
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providerCache *client.ProviderCache
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clientProvider *fakeClientProvider
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}
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func setupCacheContext() *cacheTestContext {
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fp := newFakePromClientProvider()
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p, err := client.NewProviderCache(fp)
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if err != nil {
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panic(err)
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}
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return &cacheTestContext{
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providerCache: p,
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clientProvider: fp,
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}
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}
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func newFakePromClientProvider() *fakeClientProvider {
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return &fakeClientProvider{
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errors: make(chan error, 1),
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}
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}
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type fakeClientProvider struct {
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headers map[string]string
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numCalls int
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errors chan error
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}
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func (p *fakeClientProvider) GetClient(h map[string]string) (*client.Client, error) {
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p.headers = h
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p.numCalls++
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var err error
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select {
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case err = <-p.errors:
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default:
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}
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var config []string
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for _, v := range h {
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config = append(config, v)
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}
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sort.Strings(config) //because map
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res := &http.Response{
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StatusCode: 200,
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Header: http.Header{},
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Body: ioutil.NopCloser(strings.NewReader(strings.Join(config, ","))),
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}
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c := &fakeClient{res: res}
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return client.NewClient(c, "GET", "http://localhost:9090/"), err
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}
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type fakeClient struct {
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res *http.Response
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}
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func (c *fakeClient) Do(req *http.Request) (*http.Response, error) {
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return c.res, nil
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}
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