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resource_consumer_handler.go
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/
resource_consumer_handler.go
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/*
Copyright 2015 The Kubernetes Authors All rights reserved.
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 main
import (
"fmt"
"net/http"
"net/url"
"strconv"
"sync"
"time"
. "k8s.io/kubernetes/test/images/resource-consumer/common"
)
type ResourceConsumerHandler struct {
metrics map[string]float64
metricsLock sync.Mutex
}
func NewResourceConsumerHandler() *ResourceConsumerHandler {
return &ResourceConsumerHandler{metrics: map[string]float64{}}
}
func (handler *ResourceConsumerHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
// handle exposing metrics in Prometheus format (both GET & POST)
if req.URL.Path == MetricsAddress {
handler.handleMetrics(w)
return
}
if req.Method != "POST" {
http.Error(w, BadRequest, http.StatusBadRequest)
return
}
// parsing POST request data and URL data
if err := req.ParseForm(); err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
// handle consumeCPU
if req.URL.Path == ConsumeCPUAddress {
handler.handleConsumeCPU(w, req.Form)
return
}
// handle consumeMem
if req.URL.Path == ConsumeMemAddress {
handler.handleConsumeMem(w, req.Form)
return
}
// handle getCurrentStatus
if req.URL.Path == GetCurrentStatusAddress {
handler.handleGetCurrentStatus(w)
return
}
// handle bumpMetric
if req.URL.Path == BumpMetricAddress {
handler.handleBumpMetric(w, req.Form)
return
}
http.Error(w, fmt.Sprintf("%s: %s", UnknownFunction, req.URL.Path), http.StatusNotFound)
}
func (handler *ResourceConsumerHandler) handleConsumeCPU(w http.ResponseWriter, query url.Values) {
// geting string data for consumeCPU
durationSecString := query.Get(DurationSecQuery)
millicoresString := query.Get(MillicoresQuery)
if durationSecString == "" || millicoresString == "" {
http.Error(w, NotGivenFunctionArgument, http.StatusBadRequest)
return
}
// convert data (strings to ints) for consumeCPU
durationSec, durationSecError := strconv.Atoi(durationSecString)
millicores, millicoresError := strconv.Atoi(millicoresString)
if durationSecError != nil || millicoresError != nil {
http.Error(w, IncorrectFunctionArgument, http.StatusBadRequest)
return
}
go ConsumeCPU(millicores, durationSec)
fmt.Fprintln(w, ConsumeCPUAddress[1:])
fmt.Fprintln(w, millicores, MillicoresQuery)
fmt.Fprintln(w, durationSec, DurationSecQuery)
}
func (handler *ResourceConsumerHandler) handleConsumeMem(w http.ResponseWriter, query url.Values) {
// geting string data for consumeMem
durationSecString := query.Get(DurationSecQuery)
megabytesString := query.Get(MegabytesQuery)
if durationSecString == "" || megabytesString == "" {
http.Error(w, NotGivenFunctionArgument, http.StatusBadRequest)
return
}
// convert data (strings to ints) for consumeMem
durationSec, durationSecError := strconv.Atoi(durationSecString)
megabytes, megabytesError := strconv.Atoi(megabytesString)
if durationSecError != nil || megabytesError != nil {
http.Error(w, IncorrectFunctionArgument, http.StatusBadRequest)
return
}
go ConsumeMem(megabytes, durationSec)
fmt.Fprintln(w, ConsumeMemAddress[1:])
fmt.Fprintln(w, megabytes, MegabytesQuery)
fmt.Fprintln(w, durationSec, DurationSecQuery)
}
func (handler *ResourceConsumerHandler) handleGetCurrentStatus(w http.ResponseWriter) {
GetCurrentStatus()
fmt.Fprintln(w, "Warning: not implemented!")
fmt.Fprint(w, GetCurrentStatusAddress[1:])
}
func (handler *ResourceConsumerHandler) handleMetrics(w http.ResponseWriter) {
handler.metricsLock.Lock()
defer handler.metricsLock.Unlock()
for k, v := range handler.metrics {
fmt.Fprintf(w, "# HELP %s info message.\n", k)
fmt.Fprintf(w, "# TYPE %s gauge\n", k)
fmt.Fprintf(w, "%s %f\n", k, v)
}
}
func (handler *ResourceConsumerHandler) bumpMetric(metric string, delta float64, duration time.Duration) {
handler.metricsLock.Lock()
if _, ok := handler.metrics[metric]; ok {
handler.metrics[metric] += delta
} else {
handler.metrics[metric] = delta
}
handler.metricsLock.Unlock()
time.Sleep(duration)
handler.metricsLock.Lock()
handler.metrics[metric] -= delta
handler.metricsLock.Unlock()
}
func (handler *ResourceConsumerHandler) handleBumpMetric(w http.ResponseWriter, query url.Values) {
// geting string data for handleBumpMetric
metric := query.Get(MetricNameQuery)
deltaString := query.Get(DeltaQuery)
durationSecString := query.Get(DurationSecQuery)
if durationSecString == "" || metric == "" || deltaString == "" {
http.Error(w, NotGivenFunctionArgument, http.StatusBadRequest)
return
}
// convert data (strings to ints/floats) for handleBumpMetric
durationSec, durationSecError := strconv.Atoi(durationSecString)
delta, deltaError := strconv.ParseFloat(deltaString, 64)
if durationSecError != nil || deltaError != nil {
http.Error(w, IncorrectFunctionArgument, http.StatusBadRequest)
return
}
go handler.bumpMetric(metric, delta, time.Duration(durationSec)*time.Second)
fmt.Fprintln(w, BumpMetricAddress[1:])
fmt.Fprintln(w, metric, MetricNameQuery)
fmt.Fprintln(w, delta, DeltaQuery)
fmt.Fprintln(w, durationSec, DurationSecQuery)
}