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/*
Copyright 2022 The Kubernetes Authors.
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 testing
import (
"fmt"
"strings"
"github.com/prometheus/client_golang/prometheus"
promtest "github.com/prometheus/client_golang/prometheus/testutil"
agent "sigs.k8s.io/apiserver-network-proxy/pkg/agent/metrics"
server "sigs.k8s.io/apiserver-network-proxy/pkg/server/metrics"
)
const (
serverDialFailureHeader = `
# HELP konnectivity_network_proxy_server_dial_failure_count Number of dial failures observed. Multiple failures can occur for a single dial request.
# TYPE konnectivity_network_proxy_server_dial_failure_count counter`
serverDialFailureSample = `konnectivity_network_proxy_server_dial_failure_count{reason="%s"} %d`
serverPendingDialsHeader = `
# HELP konnectivity_network_proxy_server_pending_backend_dials Current number of pending backend dial requests
# TYPE konnectivity_network_proxy_server_pending_backend_dials gauge`
serverPendingDialsSample = `konnectivity_network_proxy_server_pending_backend_dials{} %d`
serverReadyBackendsHeader = `
# HELP konnectivity_network_proxy_server_ready_backend_connections Number of konnectivity agent connected to the proxy server
# TYPE konnectivity_network_proxy_server_ready_backend_connections gauge`
serverReadyBackendsSample = `konnectivity_network_proxy_server_ready_backend_connections{} %d`
serverEstablishedConnsHeader = `
# HELP konnectivity_network_proxy_server_established_connections Current number of established end-to-end connections (post-dial).
# TYPE konnectivity_network_proxy_server_established_connections gauge`
serverEstablishedConnsSample = `konnectivity_network_proxy_server_established_connections{} %d`
agentDialFailureHeader = `
# HELP konnectivity_network_proxy_agent_endpoint_dial_failure_total Number of failures dialing the remote endpoint, by reason (example: timeout).
# TYPE konnectivity_network_proxy_agent_endpoint_dial_failure_total counter`
agentDialFailureSample = `konnectivity_network_proxy_agent_endpoint_dial_failure_total{reason="%s"} %d`
agentEndpointConnections = `
# HELP konnectivity_network_proxy_agent_open_endpoint_connections Current number of open endpoint connections.
# TYPE konnectivity_network_proxy_agent_open_endpoint_connections gauge
konnectivity_network_proxy_agent_open_endpoint_connections %d`
)
var DefaultTester = &Tester{}
var _ ServerTester = DefaultTester
var _ AgentTester = DefaultTester
type Tester struct {
// Endpoint is the metrics endpoint to scrape metrics from. If it is empty, the in-process
// DefaultGatherer is used.
Endpoint string
}
type ServerTester interface {
ExpectServerDialFailures(map[server.DialFailureReason]int) error
ExpectServerDialFailure(server.DialFailureReason, int) error
ExpectServerPendingDials(int) error
ExpectServerReadyBackends(int) error
ExpectServerEstablishedConns(int) error
}
type AgentTester interface {
ExpectAgentDialFailures(map[agent.DialFailureReason]int) error
ExpectAgentDialFailure(agent.DialFailureReason, int) error
ExpectAgentEndpointConnections(int) error
}
func (t *Tester) ExpectServerDialFailures(expected map[server.DialFailureReason]int) error {
expect := serverDialFailureHeader + "\n"
for r, v := range expected {
expect += fmt.Sprintf(serverDialFailureSample+"\n", r, v)
}
return t.ExpectMetric(server.Namespace, server.Subsystem, "dial_failure_count", expect)
}
func (t *Tester) ExpectServerDialFailure(reason server.DialFailureReason, count int) error {
return t.ExpectServerDialFailures(map[server.DialFailureReason]int{reason: count})
}
func (t *Tester) ExpectServerPendingDials(v int) error {
expect := serverPendingDialsHeader + "\n"
expect += fmt.Sprintf(serverPendingDialsSample+"\n", v)
return t.ExpectMetric(server.Namespace, server.Subsystem, "pending_backend_dials", expect)
}
func (t *Tester) ExpectServerReadyBackends(v int) error {
expect := serverReadyBackendsHeader + "\n"
expect += fmt.Sprintf(serverReadyBackendsSample+"\n", v)
return t.ExpectMetric(server.Namespace, server.Subsystem, "ready_backend_connections", expect)
}
func (t *Tester) ExpectServerEstablishedConns(v int) error {
expect := serverEstablishedConnsHeader + "\n"
expect += fmt.Sprintf(serverEstablishedConnsSample+"\n", v)
return t.ExpectMetric(server.Namespace, server.Subsystem, "established_connections", expect)
}
func (t *Tester) ExpectAgentDialFailures(expected map[agent.DialFailureReason]int) error {
expect := agentDialFailureHeader + "\n"
for r, v := range expected {
expect += fmt.Sprintf(agentDialFailureSample+"\n", r, v)
}
return t.ExpectMetric(agent.Namespace, agent.Subsystem, "endpoint_dial_failure_total", expect)
}
func (t *Tester) ExpectAgentDialFailure(reason agent.DialFailureReason, count int) error {
return t.ExpectAgentDialFailures(map[agent.DialFailureReason]int{reason: count})
}
func (t *Tester) ExpectAgentEndpointConnections(count int) error {
expect := fmt.Sprintf(agentEndpointConnections+"\n", count)
return t.ExpectMetric(agent.Namespace, agent.Subsystem, "open_endpoint_connections", expect)
}
func (t *Tester) ExpectMetric(namespace, subsystem, name, expected string) error {
fqName := prometheus.BuildFQName(namespace, subsystem, name)
if t.Endpoint == "" {
return promtest.GatherAndCompare(prometheus.DefaultGatherer, strings.NewReader(expected), fqName)
}
return promtest.ScrapeAndCompare(t.Endpoint, strings.NewReader(expected), fqName)
}
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