forked from nsqio/nsq
/
http.go
869 lines (760 loc) · 24.2 KB
/
http.go
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package main
import (
"fmt"
"github.com/bitly/go-nsq"
"github.com/bitly/nsq/util"
"github.com/bitly/nsq/util/lookupd"
"html/template"
"io"
"io/ioutil"
"log"
"net"
"net/http"
"net/http/httputil"
"net/url"
"regexp"
"strings"
"time"
)
var templates *template.Template
func loadTemplates() {
var err error
t := template.New("nsqadmin").Funcs(template.FuncMap{
"commafy": util.Commafy,
"getNodeConsistencyClass": getNodeConsistencyClass,
})
templates, err = t.ParseGlob(fmt.Sprintf("%s/*.html", *templateDir))
if err != nil {
log.Printf("ERROR: %s", err.Error())
}
}
// this is similar to httputil.NewSingleHostReverseProxy except it passes along basic auth
func NewSingleHostReverseProxy(target *url.URL, timeout time.Duration) *httputil.ReverseProxy {
director := func(req *http.Request) {
req.URL.Scheme = target.Scheme
req.URL.Host = target.Host
if target.User != nil {
passwd, _ := target.User.Password()
req.SetBasicAuth(target.User.Username(), passwd)
}
}
return &httputil.ReverseProxy{
Director: director,
Transport: util.NewDeadlineTransport(timeout),
}
}
func httpServer(listener net.Listener) {
loadTemplates()
log.Printf("HTTP: listening on %s", listener.Addr().String())
globalCounters = make(map[string]counterData)
handler := http.NewServeMux()
handler.HandleFunc("/favicon.ico", faviconHandler)
handler.HandleFunc("/ping", pingHandler)
handler.HandleFunc("/", indexHandler)
handler.HandleFunc("/nodes", nodesHandler)
handler.HandleFunc("/node/", nodeHandler)
handler.HandleFunc("/topic/", topicHandler)
handler.HandleFunc("/tombstone_topic_producer", tombstoneTopicProducerHandler)
handler.HandleFunc("/empty_topic", emptyTopicHandler)
handler.HandleFunc("/delete_topic", deleteTopicHandler)
handler.HandleFunc("/delete_channel", deleteChannelHandler)
handler.HandleFunc("/empty_channel", emptyChannelHandler)
handler.HandleFunc("/pause_channel", pauseChannelHandler)
handler.HandleFunc("/unpause_channel", pauseChannelHandler)
handler.HandleFunc("/counter/data", counterDataHandler)
handler.HandleFunc("/counter", counterHandler)
handler.HandleFunc("/lookup", lookupHandler)
handler.HandleFunc("/create_topic_channel", createTopicChannelHandler)
handler.HandleFunc("/graphite_data", graphiteDataHandler)
if *proxyGraphite {
url, err := url.Parse(*graphiteUrl)
if err != nil {
log.Printf("ERROR: failed to parse --graphite-url='%s' - %s", *graphiteUrl, err.Error())
} else {
proxy := NewSingleHostReverseProxy(url, 20*time.Second)
handler.Handle("/render", proxy)
}
}
server := &http.Server{
Handler: handler,
}
err := server.Serve(listener)
// theres no direct way to detect this error because it is not exposed
if err != nil && !strings.Contains(err.Error(), "use of closed network connection") {
log.Printf("ERROR: http.Serve() - %s", err.Error())
}
log.Printf("HTTP: closing %s", listener.Addr().String())
}
func pingHandler(w http.ResponseWriter, req *http.Request) {
w.Header().Set("Content-Length", "2")
io.WriteString(w, "OK")
}
func indexHandler(w http.ResponseWriter, req *http.Request) {
reqParams, err := util.NewReqParams(req)
if err != nil {
log.Printf("ERROR: failed to parse request params - %s", err.Error())
http.Error(w, "INVALID_REQUEST", 500)
return
}
var topics []string
if len(lookupdHTTPAddrs) != 0 {
topics, _ = lookupd.GetLookupdTopics(lookupdHTTPAddrs)
} else {
topics, _ = lookupd.GetNSQDTopics(nsqdHTTPAddrs)
}
p := struct {
Title string
GraphOptions *GraphOptions
Topics Topics
Version string
}{
Title: "NSQ",
GraphOptions: NewGraphOptions(w, req, reqParams),
Topics: TopicsFromStrings(topics),
Version: util.BINARY_VERSION,
}
err = templates.ExecuteTemplate(w, "index.html", p)
if err != nil {
log.Printf("Template Error %s", err.Error())
http.Error(w, "Template Error", 500)
}
}
func topicHandler(w http.ResponseWriter, req *http.Request) {
var urlRegex = regexp.MustCompile(`^/topic/(.*)$`)
matches := urlRegex.FindStringSubmatch(req.URL.Path)
if len(matches) == 0 {
http.Error(w, "INVALID_TOPIC", 500)
return
}
parts := strings.Split(matches[1], "/")
topicName := parts[0]
if !nsq.IsValidTopicName(topicName) {
http.Error(w, "INVALID_TOPIC", 500)
return
}
if len(parts) == 2 {
channelName := parts[1]
if !nsq.IsValidChannelName(channelName) {
http.Error(w, "INVALID_CHANNEL", 500)
} else {
channelHandler(w, req, topicName, channelName)
}
return
}
reqParams, err := util.NewReqParams(req)
if err != nil {
log.Printf("ERROR: failed to parse request params - %s", err.Error())
http.Error(w, "INVALID_REQUEST", 500)
return
}
producers := getProducers(topicName)
topicStats, channelStats, _ := lookupd.GetNSQDStats(producers, topicName)
globalTopicStats := &lookupd.TopicStats{HostAddress: "Total"}
for _, t := range topicStats {
globalTopicStats.Add(t)
}
p := struct {
Title string
GraphOptions *GraphOptions
Version string
Topic string
TopicProducers []string
TopicStats []*lookupd.TopicStats
GlobalTopicStats *lookupd.TopicStats
ChannelStats map[string]*lookupd.ChannelStats
}{
Title: fmt.Sprintf("NSQ %s", topicName),
GraphOptions: NewGraphOptions(w, req, reqParams),
Version: util.BINARY_VERSION,
Topic: topicName,
TopicProducers: producers,
TopicStats: topicStats,
GlobalTopicStats: globalTopicStats,
ChannelStats: channelStats,
}
err = templates.ExecuteTemplate(w, "topic.html", p)
if err != nil {
log.Printf("Template Error %s", err.Error())
http.Error(w, "Template Error", 500)
}
}
func channelHandler(w http.ResponseWriter, req *http.Request, topicName string, channelName string) {
reqParams, err := util.NewReqParams(req)
if err != nil {
log.Printf("ERROR: failed to parse request params - %s", err.Error())
http.Error(w, "INVALID_REQUEST", 500)
return
}
producers := getProducers(topicName)
_, allChannelStats, _ := lookupd.GetNSQDStats(producers, topicName)
channelStats := allChannelStats[channelName]
p := struct {
Title string
GraphOptions *GraphOptions
Version string
Topic string
Channel string
TopicProducers []string
ChannelStats *lookupd.ChannelStats
}{
Title: fmt.Sprintf("NSQ %s / %s", topicName, channelName),
GraphOptions: NewGraphOptions(w, req, reqParams),
Version: util.BINARY_VERSION,
Topic: topicName,
Channel: channelName,
TopicProducers: producers,
ChannelStats: channelStats,
}
err = templates.ExecuteTemplate(w, "channel.html", p)
if err != nil {
log.Printf("Template Error %s", err.Error())
http.Error(w, "Template Error", 500)
}
}
func lookupHandler(w http.ResponseWriter, req *http.Request) {
reqParams, err := util.NewReqParams(req)
if err != nil {
log.Printf("ERROR: failed to parse request params - %s", err.Error())
http.Error(w, "INVALID_REQUEST", 500)
return
}
channels := make(map[string][]string)
allTopics, _ := lookupd.GetLookupdTopics(lookupdHTTPAddrs)
for _, topicName := range allTopics {
var producers []string
producers, _ = lookupd.GetLookupdTopicProducers(topicName, lookupdHTTPAddrs)
if len(producers) == 0 {
topicChannels, _ := lookupd.GetLookupdTopicChannels(topicName, lookupdHTTPAddrs)
channels[topicName] = topicChannels
}
}
p := struct {
Title string
GraphOptions *GraphOptions
TopicMap map[string][]string
Lookupd []string
Version string
}{
Title: "NSQ Lookup",
GraphOptions: NewGraphOptions(w, req, reqParams),
TopicMap: channels,
Lookupd: lookupdHTTPAddrs,
Version: util.BINARY_VERSION,
}
err = templates.ExecuteTemplate(w, "lookup.html", p)
if err != nil {
log.Printf("Template Error %s", err.Error())
http.Error(w, "Template Error", 500)
}
}
func createTopicChannelHandler(w http.ResponseWriter, req *http.Request) {
if req.Method != "POST" {
log.Printf("ERROR: invalid %s to POST only method", req.Method)
http.Error(w, "INVALID_REQUEST", 500)
return
}
reqParams := &util.PostParams{req}
topicName, err := reqParams.Get("topic")
if err != nil || !nsq.IsValidTopicName(topicName) {
http.Error(w, "INVALID_TOPIC", 500)
return
}
channelName, err := reqParams.Get("channel")
if err != nil || (len(channelName) > 0 && !nsq.IsValidChannelName(channelName)) {
http.Error(w, "INVALID_CHANNEL", 500)
return
}
for _, addr := range lookupdHTTPAddrs {
endpoint := fmt.Sprintf("http://%s/create_topic?topic=%s", addr, url.QueryEscape(topicName))
log.Printf("LOOKUPD: querying %s", endpoint)
_, err := util.ApiRequest(endpoint)
if err != nil {
log.Printf("ERROR: lookupd %s - %s", endpoint, err.Error())
continue
}
}
NotifyAdminAction("create_topic", topicName, "", "", req)
if len(channelName) > 0 {
for _, addr := range lookupdHTTPAddrs {
endpoint := fmt.Sprintf("http://%s/create_channel?topic=%s&channel=%s",
addr, url.QueryEscape(topicName), url.QueryEscape(channelName))
log.Printf("LOOKUPD: querying %s", endpoint)
_, err := util.ApiRequest(endpoint)
if err != nil {
log.Printf("ERROR: lookupd %s - %s", endpoint, err.Error())
continue
}
}
// TODO: we can remove this when we push new channel information from nsqlookupd -> nsqd
producers, _ := lookupd.GetLookupdTopicProducers(topicName, lookupdHTTPAddrs)
for _, addr := range producers {
endpoint := fmt.Sprintf("http://%s/create_channel?topic=%s&channel=%s",
addr, url.QueryEscape(topicName), url.QueryEscape(channelName))
log.Printf("NSQD: querying %s", endpoint)
_, err := util.ApiRequest(endpoint)
if err != nil {
log.Printf("ERROR: nsqd %s - %s", endpoint, err.Error())
continue
}
}
NotifyAdminAction("create_channel", topicName, channelName, "", req)
}
http.Redirect(w, req, "/lookup", 302)
}
func tombstoneTopicProducerHandler(w http.ResponseWriter, req *http.Request) {
if req.Method != "POST" {
log.Printf("ERROR: invalid %s to POST only method", req.Method)
http.Error(w, "INVALID_REQUEST", 500)
return
}
reqParams := &util.PostParams{req}
topicName, err := reqParams.Get("topic")
if err != nil {
http.Error(w, "MISSING_ARG_TOPIC", 500)
return
}
node, err := reqParams.Get("node")
if err != nil {
http.Error(w, "MISSING_ARG_NODE", 500)
return
}
rd, _ := reqParams.Get("rd")
if !strings.HasPrefix(rd, "/") {
rd = "/"
}
// tombstone the topic on all the lookupds
for _, addr := range lookupdHTTPAddrs {
endpoint := fmt.Sprintf("http://%s/tombstone_topic_producer?topic=%s&node=%s",
addr, url.QueryEscape(topicName), url.QueryEscape(node))
log.Printf("LOOKUPD: querying %s", endpoint)
_, err := util.ApiRequest(endpoint)
if err != nil {
log.Printf("ERROR: lookupd %s - %s", endpoint, err.Error())
}
}
// delete the topic on the producer
endpoint := fmt.Sprintf("http://%s/delete_topic?topic=%s", node, url.QueryEscape(topicName))
log.Printf("NSQD: querying %s", endpoint)
_, err = util.ApiRequest(endpoint)
if err != nil {
log.Printf("ERROR: nsqd %s - %s", endpoint, err.Error())
}
NotifyAdminAction("tombstone_topic_producer", topicName, "", node, req)
http.Redirect(w, req, rd, 302)
}
func deleteTopicHandler(w http.ResponseWriter, req *http.Request) {
if req.Method != "POST" {
log.Printf("ERROR: invalid %s to POST only method", req.Method)
http.Error(w, "INVALID_REQUEST", 500)
return
}
reqParams := &util.PostParams{req}
topicName, err := reqParams.Get("topic")
if err != nil {
http.Error(w, "MISSING_ARG_TOPIC", 500)
return
}
rd, _ := reqParams.Get("rd")
if !strings.HasPrefix(rd, "/") {
rd = "/"
}
// for topic removal, you need to get all the producers *first*
producers := getProducers(topicName)
// remove the topic from all the lookupds
for _, addr := range lookupdHTTPAddrs {
endpoint := fmt.Sprintf("http://%s/delete_topic?topic=%s", addr, url.QueryEscape(topicName))
log.Printf("LOOKUPD: querying %s", endpoint)
_, err := util.ApiRequest(endpoint)
if err != nil {
log.Printf("ERROR: lookupd %s - %s", endpoint, err.Error())
continue
}
}
// now remove the topic from all the producers
for _, addr := range producers {
endpoint := fmt.Sprintf("http://%s/delete_topic?topic=%s", addr, url.QueryEscape(topicName))
log.Printf("NSQD: querying %s", endpoint)
_, err := util.ApiRequest(endpoint)
if err != nil {
log.Printf("ERROR: nsqd %s - %s", endpoint, err.Error())
continue
}
}
NotifyAdminAction("delete_topic", topicName, "", "", req)
http.Redirect(w, req, rd, 302)
}
func deleteChannelHandler(w http.ResponseWriter, req *http.Request) {
if req.Method != "POST" {
log.Printf("ERROR: invalid %s to POST only method", req.Method)
http.Error(w, "INVALID_REQUEST", 500)
return
}
reqParams := &util.PostParams{req}
topicName, channelName, err := util.GetTopicChannelArgs(reqParams)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
rd, _ := reqParams.Get("rd")
if !strings.HasPrefix(rd, "/") {
rd = fmt.Sprintf("/topic/%s", url.QueryEscape(topicName))
}
for _, addr := range lookupdHTTPAddrs {
endpoint := fmt.Sprintf("http://%s/delete_channel?topic=%s&channel=%s",
addr, url.QueryEscape(topicName), url.QueryEscape(channelName))
log.Printf("LOOKUPD: querying %s", endpoint)
_, err := util.ApiRequest(endpoint)
if err != nil {
log.Printf("ERROR: lookupd %s - %s", endpoint, err.Error())
continue
}
}
producers := getProducers(topicName)
for _, addr := range producers {
endpoint := fmt.Sprintf("http://%s/delete_channel?topic=%s&channel=%s",
addr, url.QueryEscape(topicName), url.QueryEscape(channelName))
log.Printf("NSQD: querying %s", endpoint)
_, err := util.ApiRequest(endpoint)
if err != nil {
log.Printf("ERROR: nsqd %s - %s", endpoint, err.Error())
continue
}
}
NotifyAdminAction("delete_channel", topicName, channelName, "", req)
http.Redirect(w, req, rd, 302)
}
func emptyTopicHandler(w http.ResponseWriter, req *http.Request) {
if req.Method != "POST" {
log.Printf("ERROR: invalid %s to POST only method", req.Method)
http.Error(w, "INVALID_REQUEST", 500)
return
}
reqParams := &util.PostParams{req}
topicName, err := reqParams.Get("topic")
if err != nil {
http.Error(w, "MISSING_ARG_TOPIC", 500)
return
}
producers := getProducers(topicName)
for _, addr := range producers {
endpoint := fmt.Sprintf("http://%s/empty_topic?topic=%s", addr, url.QueryEscape(topicName))
log.Printf("NSQD: calling %s", endpoint)
_, err := util.ApiRequest(endpoint)
if err != nil {
log.Printf("ERROR: nsqd %s - %s", endpoint, err.Error())
continue
}
}
NotifyAdminAction("empty_topic", topicName, "", "", req)
http.Redirect(w, req, fmt.Sprintf("/topic/%s", url.QueryEscape(topicName)), 302)
}
func emptyChannelHandler(w http.ResponseWriter, req *http.Request) {
if req.Method != "POST" {
log.Printf("ERROR: invalid %s to POST only method", req.Method)
http.Error(w, "INVALID_REQUEST", 500)
return
}
reqParams := &util.PostParams{req}
topicName, channelName, err := util.GetTopicChannelArgs(reqParams)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
producers := getProducers(topicName)
for _, addr := range producers {
endpoint := fmt.Sprintf("http://%s/empty_channel?topic=%s&channel=%s",
addr, url.QueryEscape(topicName), url.QueryEscape(channelName))
log.Printf("NSQD: calling %s", endpoint)
_, err := util.ApiRequest(endpoint)
if err != nil {
log.Printf("ERROR: nsqd %s - %s", endpoint, err.Error())
continue
}
}
NotifyAdminAction("empty_channel", topicName, channelName, "", req)
http.Redirect(w, req, fmt.Sprintf("/topic/%s/%s", url.QueryEscape(topicName), url.QueryEscape(channelName)), 302)
}
func pauseChannelHandler(w http.ResponseWriter, req *http.Request) {
if req.Method != "POST" {
log.Printf("ERROR: invalid %s to POST only method", req.Method)
http.Error(w, "INVALID_REQUEST", 500)
return
}
reqParams := &util.PostParams{req}
topicName, channelName, err := util.GetTopicChannelArgs(reqParams)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
producers := getProducers(topicName)
for _, addr := range producers {
endpoint := fmt.Sprintf("http://%s%s?topic=%s&channel=%s",
addr, req.URL.Path, url.QueryEscape(topicName), url.QueryEscape(channelName))
log.Printf("NSQD: calling %s", endpoint)
_, err := util.ApiRequest(endpoint)
if err != nil {
log.Printf("ERROR: nsqd %s - %s", endpoint, err.Error())
continue
}
}
NotifyAdminAction(strings.TrimLeft(req.URL.Path, "/"), topicName, channelName, "", req)
http.Redirect(w, req, fmt.Sprintf("/topic/%s/%s", url.QueryEscape(topicName), url.QueryEscape(channelName)), 302)
}
func getNodeConsistencyClass(node *lookupd.Producer) string {
if node.IsInconsistent(len(lookupdHTTPAddrs)) {
return "btn-warning"
}
return ""
}
func nodeHandler(w http.ResponseWriter, req *http.Request) {
reqParams, err := util.NewReqParams(req)
if err != nil {
log.Printf("ERROR: failed to parse request params - %s", err.Error())
http.Error(w, "INVALID_REQUEST", 500)
return
}
var urlRegex = regexp.MustCompile(`^/node/(.*)$`)
matches := urlRegex.FindStringSubmatch(req.URL.Path)
if len(matches) == 0 {
http.Error(w, "INVALID_NODE", 500)
return
}
parts := strings.Split(matches[1], "/")
node := parts[0]
found := false
for _, n := range nsqdHTTPAddrs {
if node == n {
found = true
break
}
}
producers, _ := lookupd.GetLookupdProducers(lookupdHTTPAddrs)
for _, p := range producers {
if node == fmt.Sprintf("%s:%d", p.BroadcastAddress, p.HttpPort) {
found = true
break
}
}
if !found {
http.Error(w, "INVALID_NODE", 500)
return
}
topicStats, channelStats, _ := lookupd.GetNSQDStats([]string{node}, "")
numClients := int64(0)
numMessages := int64(0)
for _, ts := range topicStats {
for _, cs := range ts.Channels {
numClients += int64(len(cs.Clients))
}
numMessages += ts.MessageCount
}
p := struct {
Title string
Version string
GraphOptions *GraphOptions
Node Node
TopicStats []*lookupd.TopicStats
ChannelStats map[string]*lookupd.ChannelStats
NumMessages int64
NumClients int64
}{
Title: "NSQ Node - " + node,
Version: util.BINARY_VERSION,
GraphOptions: NewGraphOptions(w, req, reqParams),
Node: Node(node),
TopicStats: topicStats,
ChannelStats: channelStats,
NumMessages: numMessages,
NumClients: numClients,
}
err = templates.ExecuteTemplate(w, "node.html", p)
if err != nil {
log.Printf("Template Error %s", err.Error())
http.Error(w, "Template Error", 500)
}
}
func nodesHandler(w http.ResponseWriter, req *http.Request) {
reqParams, err := util.NewReqParams(req)
if err != nil {
log.Printf("ERROR: failed to parse request params - %s", err.Error())
http.Error(w, "INVALID_REQUEST", 500)
return
}
producers, _ := lookupd.GetLookupdProducers(lookupdHTTPAddrs)
p := struct {
Title string
Version string
GraphOptions *GraphOptions
Producers []*lookupd.Producer
Lookupd []string
}{
Title: "NSQ Nodes",
Version: util.BINARY_VERSION,
GraphOptions: NewGraphOptions(w, req, reqParams),
Producers: producers,
Lookupd: lookupdHTTPAddrs,
}
err = templates.ExecuteTemplate(w, "nodes.html", p)
if err != nil {
log.Printf("Template Error %s", err.Error())
http.Error(w, "Template Error", 500)
}
}
type counterTarget struct{}
func (c counterTarget) Target(key string) (string, string) {
return fmt.Sprintf("sumSeries(%%stopic.*.channel.*.%s)", key), "green"
}
func (c counterTarget) Host() string {
return "*"
}
func counterHandler(w http.ResponseWriter, req *http.Request) {
reqParams, err := util.NewReqParams(req)
if err != nil {
log.Printf("ERROR: failed to parse request params - %s", err.Error())
http.Error(w, "INVALID_REQUEST", 500)
return
}
p := struct {
Title string
Version string
GraphOptions *GraphOptions
Target counterTarget
}{
Title: "NSQ Message Counts",
Version: util.BINARY_VERSION,
GraphOptions: NewGraphOptions(w, req, reqParams),
Target: counterTarget{},
}
err = templates.ExecuteTemplate(w, "counter.html", p)
if err != nil {
log.Printf("Template Error %s", err.Error())
http.Error(w, "Template Error", 500)
}
}
type counterData map[string]int64
var globalCounters map[string]counterData
// this endpoint works by giving out an ID that maps to a stats dictionary
// The initial request is the number of messages processed since each nsqd started up.
// Subsequent requsts pass that ID and get an updated delta based on each individual channel/nsqd message count
// That ID must be re-requested or it will be expired.
func counterDataHandler(w http.ResponseWriter, req *http.Request) {
reqParams, err := util.NewReqParams(req)
if err != nil {
log.Printf("ERROR: failed to parse request params - %s", err.Error())
util.ApiResponse(w, 500, "INVALID_REQUEST", nil)
return
}
statsID, _ := reqParams.Get("id")
now := time.Now()
if statsID == "" {
// make a new one
statsID = fmt.Sprintf("%d.%d", now.Unix(), now.UnixNano())
}
stats, ok := globalCounters[statsID]
if !ok {
stats = make(map[string]int64)
}
newStats := make(map[string]int64)
newStats["time"] = now.Unix()
producers, _ := lookupd.GetLookupdProducers(lookupdHTTPAddrs)
addresses := make([]string, len(producers))
for i, p := range producers {
addresses[i] = p.HTTPAddress()
}
_, channelStats, _ := lookupd.GetNSQDStats(addresses, "")
var newMessages int64
var totalMessages int64
for _, channelStats := range channelStats {
for _, hostChannelStats := range channelStats.HostStats {
key := fmt.Sprintf("%s:%s:%s", channelStats.TopicName, channelStats.ChannelName, hostChannelStats.HostAddress)
d, ok := stats[key]
if ok && d <= hostChannelStats.MessageCount {
newMessages += (hostChannelStats.MessageCount - d)
}
totalMessages += hostChannelStats.MessageCount
newStats[key] = hostChannelStats.MessageCount
}
}
globalCounters[statsID] = newStats
data := make(map[string]interface{})
data["new_messages"] = newMessages
data["total_messages"] = totalMessages
data["id"] = statsID
util.ApiResponse(w, 200, "OK", data)
}
func faviconHandler(w http.ResponseWriter, req *http.Request) {
http.NotFound(w, req)
}
func graphiteDataHandler(w http.ResponseWriter, req *http.Request) {
reqParams, err := util.NewReqParams(req)
if err != nil {
log.Printf("ERROR: failed to parse request params - %s", err.Error())
http.Error(w, "INVALID_REQUEST", 500)
return
}
metric, err := reqParams.Get("metric")
if err != nil {
log.Printf("ERROR: missing metric param - %s", err.Error())
http.Error(w, "MISSING_METRIC_PARAM", 500)
return
}
target, err := reqParams.Get("target")
if err != nil {
log.Printf("ERROR: missing target param - %s", err.Error())
http.Error(w, "MISSING_TARGET_PARAM", 500)
return
}
var queryFunc func(string) string
var formatJsonResponseFunc func([]byte) ([]byte, error)
switch metric {
case "rate":
queryFunc = rateQuery
formatJsonResponseFunc = parseRateResponse
default:
log.Printf("ERROR: unknown metric value %s", metric)
http.Error(w, "INVALID_METRIC_PARAM", 500)
return
}
query := queryFunc(target)
url := *graphiteUrl + query
log.Printf("GRAPHITE: %s", url)
response, err := GraphiteGet(url)
if err != nil {
log.Printf("ERROR: graphite request failed %s", err.Error())
http.Error(w, "GRAPHITE_FAILED", 500)
return
}
resp, err := formatJsonResponseFunc(response)
if err != nil {
log.Printf("ERROR: response formating failed - %s", err.Error())
http.Error(w, "INVALID_GRAPHITE_RESPONSE", 500)
return
}
w.Header().Set("Content-Type", "application/json")
w.Write(resp)
return
}
func GraphiteGet(request_url string) ([]byte, error) {
response, err := http.Get(request_url)
var contents []byte
if err != nil {
log.Printf("ERROR: GET request to graphite failed %s", err)
return nil, err
}
defer response.Body.Close()
contents, err = ioutil.ReadAll(response.Body)
if err != nil {
log.Printf("ERROR: reading GET body failed %s", err)
return nil, err
}
return contents, nil
}
func getProducers(topicName string) []string {
var producers []string
if len(lookupdHTTPAddrs) != 0 {
producers, _ = lookupd.GetLookupdTopicProducers(topicName, lookupdHTTPAddrs)
} else {
producers, _ = lookupd.GetNSQDTopicProducers(topicName, nsqdHTTPAddrs)
}
return producers
}