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Uyuni login less often (#10072)

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* Initial implementation of caching the uyuni login token

Signed-off-by: David N Perkins <David.N.Perkins@ibm.com>
This commit is contained in:
David N Perkins 2022-02-15 10:38:38 -05:00 committed by GitHub
parent afdd1357e0
commit fcb6f18122
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 94 additions and 29 deletions
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58
discovery/uyuni/uyuni.go
View file

@ -23,7 +23,6 @@ import (
"time"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/kolo/xmlrpc"
"github.com/pkg/errors"
"github.com/prometheus/common/config"
@ -47,6 +46,8 @@ const (
uyuniLabelProxyModule = uyuniMetaLabelPrefix + "proxy_module"
uyuniLabelMetricsPath = uyuniMetaLabelPrefix + "metrics_path"
uyuniLabelScheme = uyuniMetaLabelPrefix + "scheme"
tokenDuration = 10 * time.Minute
)
// DefaultSDConfig is the default Uyuni SD configuration.
@ -96,14 +97,16 @@ type endpointInfo struct {
// Discovery periodically performs Uyuni API requests. It implements the Discoverer interface.
type Discovery struct {
*refresh.Discovery
apiURL *url.URL
roundTripper http.RoundTripper
username string
password string
entitlement string
separator string
interval time.Duration
logger log.Logger
apiURL *url.URL
roundTripper http.RoundTripper
username string
password string
token string
tokenExpiration time.Time
entitlement string
separator string
interval time.Duration
logger log.Logger
}
// Name returns the name of the Config.
@ -140,16 +143,12 @@ func (c *SDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
return nil
}
func login(rpcclient *xmlrpc.Client, user, pass string) (string, error) {
func login(rpcclient *xmlrpc.Client, user, pass string, duration int) (string, error) {
var result string
err := rpcclient.Call("auth.login", []interface{}{user, pass}, &result)
err := rpcclient.Call("auth.login", []interface{}{user, pass, duration}, &result)
return result, err
}
func logout(rpcclient *xmlrpc.Client, token string) error {
return rpcclient.Call("auth.logout", token, nil)
}
func getSystemGroupsInfoOfMonitoredClients(rpcclient *xmlrpc.Client, token, entitlement string) (map[int][]systemGroupID, error) {
var systemGroupsInfos []struct {
SystemID int `xmlrpc:"id"`
@ -271,12 +270,11 @@ func getSystemGroupNames(systemGroupsIDs []systemGroupID) []string {
func (d *Discovery) getTargetsForSystems(
rpcClient *xmlrpc.Client,
token string,
entitlement string,
) ([]model.LabelSet, error) {
result := make([]model.LabelSet, 0)
systemGroupIDsBySystemID, err := getSystemGroupsInfoOfMonitoredClients(rpcClient, token, entitlement)
systemGroupIDsBySystemID, err := getSystemGroupsInfoOfMonitoredClients(rpcClient, d.token, entitlement)
if err != nil {
return nil, errors.Wrap(err, "unable to get the managed system groups information of monitored clients")
}
@ -286,12 +284,12 @@ func (d *Discovery) getTargetsForSystems(
systemIDs = append(systemIDs, systemID)
}
endpointInfos, err := getEndpointInfoForSystems(rpcClient, token, systemIDs)
endpointInfos, err := getEndpointInfoForSystems(rpcClient, d.token, systemIDs)
if err != nil {
return nil, errors.Wrap(err, "unable to get endpoints information")
}
networkInfoBySystemID, err := getNetworkInformationForSystems(rpcClient, token, systemIDs)
networkInfoBySystemID, err := getNetworkInformationForSystems(rpcClient, d.token, systemIDs)
if err != nil {
return nil, errors.Wrap(err, "unable to get the systems network information")
}
@ -308,25 +306,27 @@ func (d *Discovery) getTargetsForSystems(
return result, nil
}
func (d *Discovery) refresh(ctx context.Context) ([]*targetgroup.Group, error) {
func (d *Discovery) refresh(_ context.Context) ([]*targetgroup.Group, error) {
rpcClient, err := xmlrpc.NewClient(d.apiURL.String(), d.roundTripper)
if err != nil {
return nil, err
}
defer rpcClient.Close()
token, err := login(rpcClient, d.username, d.password)
if err != nil {
return nil, errors.Wrap(err, "unable to login to Uyuni API")
}
defer func() {
if err := logout(rpcClient, token); err != nil {
level.Debug(d.logger).Log("msg", "Failed to log out from Uyuni API", "err", err)
if time.Now().After(d.tokenExpiration) {
// Uyuni API takes duration in seconds.
d.token, err = login(rpcClient, d.username, d.password, int(tokenDuration.Seconds()))
if err != nil {
return nil, errors.Wrap(err, "unable to login to Uyuni API")
}
}()
// Login again at half the token lifetime.
d.tokenExpiration = time.Now().Add(tokenDuration / 2)
}
targetsForSystems, err := d.getTargetsForSystems(rpcClient, token, d.entitlement)
targetsForSystems, err := d.getTargetsForSystems(rpcClient, d.entitlement)
if err != nil {
// Force the renewal of the token on next refresh.
d.tokenExpiration = time.Now()
return nil, err
}

65
discovery/uyuni/uyuni_test.go
View file

@ -19,6 +19,7 @@ import (
"net/http"
"net/http/httptest"
"testing"
"time"
"github.com/stretchr/testify/require"
@ -56,3 +57,67 @@ func TestUyuniSDHandleError(t *testing.T) {
require.EqualError(t, err, errTesting)
require.Equal(t, len(tgs), 0)
}
func TestUyuniSDLogin(t *testing.T) {
var (
errTesting = "unable to get the managed system groups information of monitored clients: request error: bad status code - 500"
call = 0
respHandler = func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/xml")
switch call {
case 0:
w.WriteHeader(http.StatusOK)
io.WriteString(w, `<?xml version="1.0"?>
<methodResponse>
<params>
<param>
<value>
a token
</value>
</param>
</params>
</methodResponse>`)
case 1:
w.WriteHeader(http.StatusInternalServerError)
io.WriteString(w, ``)
}
call++
}
)
tgs, err := testUpdateServices(respHandler)
require.EqualError(t, err, errTesting)
require.Equal(t, len(tgs), 0)
}
func TestUyuniSDSkipLogin(t *testing.T) {
var (
errTesting = "unable to get the managed system groups information of monitored clients: request error: bad status code - 500"
respHandler = func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusInternalServerError)
w.Header().Set("Content-Type", "application/xml")
io.WriteString(w, ``)
}
)
// Create a test server with mock HTTP handler.
ts := httptest.NewServer(http.HandlerFunc(respHandler))
defer ts.Close()
conf := SDConfig{
Server: ts.URL,
}
md, err := NewDiscovery(&conf, nil)
if err != nil {
t.Error(err)
}
// simulate a cached token
md.token = `a token`
md.tokenExpiration = time.Now().Add(time.Minute)
tgs, err := md.refresh(context.Background())
require.EqualError(t, err, errTesting)
require.Equal(t, len(tgs), 0)
}