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metrics_streams.go
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/
metrics_streams.go
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package handlers
import (
"encoding/json"
"fmt"
"net/http"
"github.com/Sirupsen/logrus"
"github.com/pressly/chi"
"github.com/resourced/resourced-master/config"
"github.com/resourced/resourced-master/dal"
"github.com/resourced/resourced-master/libhttp"
"github.com/resourced/resourced-master/messagebus"
)
func ApiMetricStreams(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/event-stream")
w.Header().Set("Cache-Control", "no-cache")
w.Header().Set("Connection", "keep-alive")
w.Header().Set("Access-Control-Allow-Origin", "*")
flusher, ok := w.(http.Flusher)
if !ok {
libhttp.HandleErrorHTML(w, fmt.Errorf("Event streaming is unsupported"), 500)
return
}
bus := r.Context().Value("bus").(*messagebus.MessageBus)
accessTokenRow := r.Context().Value("accessToken").(*dal.AccessTokenRow)
errLogger := r.Context().Value("errLogger").(*logrus.Logger)
// Create a new channel for this connected client.
newClientChan := make(chan string)
// Inform message bus of this new channel.
bus.NewClientChan <- newClientChan
// Listen to the closing of the http connection via the CloseNotifier,
// and close the corresponding channel.
connClosedChan := w.(http.CloseNotifier).CloseNotify()
go func() {
<-connClosedChan
bus.CloseClientChan <- newClientChan
}()
for {
jsonContentString, isOpen := <-newClientChan
if !isOpen {
// If newClientChan was closed, client has disconnected.
break
}
payload := make(map[string]interface{})
err := json.Unmarshal([]byte(jsonContentString), &payload)
if err != nil {
errLogger.WithFields(logrus.Fields{
"Method": "ApiMetricStreams",
"Error": err,
}).Errorf("Failed to unmarshal JSON payload")
continue
}
clusterIDInterface, ok := payload["ClusterID"]
if !ok {
errLogger.WithFields(logrus.Fields{
"Method": "ApiMetricStreams",
}).Errorf("ClusterID is missing from payload")
continue
}
clusterID := int64(clusterIDInterface.(float64))
// Don't funnel payload if ClusterID is incorrect.
if clusterID != accessTokenRow.ClusterID {
continue
}
// Emit payload by MetricID
metricIDInterface, ok := payload["MetricID"]
if !ok {
errLogger.WithFields(logrus.Fields{
"Method": "ApiMetricStreams",
}).Errorf("MetricID is missing from payload")
continue
}
metricID := int64(metricIDInterface.(float64))
fmt.Fprintf(w, "event: metric|%v\n", metricID)
fmt.Fprintf(w, "data: %v\n\n", jsonContentString)
// Emit payload by MetricID and Hostname
hostnameInterface, ok := payload["Hostname"]
if ok {
fmt.Fprintf(w, "event: metric|%v|host|%v\n", metricID, hostnameInterface.(string))
fmt.Fprintf(w, "data: %v\n\n", jsonContentString)
}
flusher.Flush()
}
}
func ApiMetricIDStreams(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/event-stream")
w.Header().Set("Cache-Control", "no-cache")
w.Header().Set("Connection", "keep-alive")
w.Header().Set("Access-Control-Allow-Origin", "*")
flusher, ok := w.(http.Flusher)
if !ok {
libhttp.HandleErrorHTML(w, fmt.Errorf("Event streaming is unsupported"), 500)
return
}
dbs := r.Context().Value("dbs").(*config.DBConfig)
bus := r.Context().Value("bus").(*messagebus.MessageBus)
accessTokenRow := r.Context().Value("accessToken").(*dal.AccessTokenRow)
metricID, err := getInt64SlugFromPath(w, r, "id")
if err != nil {
libhttp.HandleErrorHTML(w, err, 500)
return
}
metricRow, err := dal.NewMetric(dbs.Core).GetByID(nil, metricID)
if err != nil {
libhttp.HandleErrorHTML(w, err, 500)
return
}
host := chi.URLParam(r, "host")
// Create a new channel for this connected client.
newClientChan := make(chan string)
// Inform message bus of this new channel.
bus.NewClientChan <- newClientChan
// Listen to the closing of the http connection via the CloseNotifier,
// and close the corresponding channel.
connClosedChan := w.(http.CloseNotifier).CloseNotify()
go func() {
<-connClosedChan
bus.CloseClientChan <- newClientChan
}()
for {
jsonContentString, isOpen := <-newClientChan
if !isOpen {
// If newClientChan was closed, client has disconnected.
break
}
payload := make(map[string]interface{})
err := json.Unmarshal([]byte(jsonContentString), &payload)
if err != nil {
logrus.WithFields(logrus.Fields{
"Method": "ApiMetricStreams",
"Error": err,
}).Errorf("Failed to unmarshal metric-%v JSON payload", metricRow.Key)
continue
}
clusterIDInterface, ok := payload["ClusterID"]
if !ok {
logrus.WithFields(logrus.Fields{
"Method": "ApiMetricStreams",
}).Errorf("ClusterID is missing from payload")
continue
}
clusterID := int64(clusterIDInterface.(float64))
// Don't funnel payload if ClusterID is incorrect.
if clusterID != accessTokenRow.ClusterID {
continue
}
// Don't funnel payload if metricRow.ClusterID does not belong.
if metricRow.ClusterID != accessTokenRow.ClusterID {
continue
}
// Make sure to only return metrics with matching hostname if host value exists.
if host != "" {
hostnameInterface, ok := payload["Hostname"]
if ok {
if hostnameInterface.(string) == host {
fmt.Fprintf(w, "event: metric|%v|host|%v\n", metricID, host)
fmt.Fprintf(w, "data: %v\n\n", jsonContentString)
flusher.Flush()
}
}
} else {
fmt.Fprintf(w, "event: metric|%v\n", metricID)
fmt.Fprintf(w, "data: %v\n\n", jsonContentString)
flusher.Flush()
}
}
}