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Added go-conntrack for monitoring http connections (#3241)

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Added metrics for in- and outgoing traffic with go-conntrack.
This commit is contained in:
Marc Sluiter 2017-10-06 12:22:19 +02:00 committed by Brian Brazil
parent 012e52e3f9
commit 6a633eece1
18 changed files with 809 additions and 23 deletions
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7
cmd/prometheus/main.go
View file

@ -17,6 +17,7 @@ package main
import (
"fmt"
"net"
"net/http"
_ "net/http/pprof" // Comment this line to disable pprof endpoint.
"net/url"
"os"
@ -37,6 +38,7 @@ import (
"gopkg.in/alecthomas/kingpin.v2"
k8s_runtime "k8s.io/apimachinery/pkg/util/runtime"
"github.com/mwitkow/go-conntrack"
"github.com/prometheus/common/promlog"
promlogflag "github.com/prometheus/common/promlog/flag"
"github.com/prometheus/prometheus/config"
@ -267,6 +269,11 @@ func main() {
webHandler := web.New(log.With(logger, "component", "web"), &cfg.web)
// Monitor outgoing connections on default transport with conntrack.
http.DefaultTransport.(*http.Transport).DialContext = conntrack.NewDialContextFunc(
conntrack.DialWithTracing(),
)
reloadables := []Reloadable{
remoteStorage,
targetManager,

9
discovery/consul/consul.go
View file

@ -24,6 +24,7 @@ import (
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
consul "github.com/hashicorp/consul/api"
"github.com/mwitkow/go-conntrack"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/config"
@ -106,7 +107,13 @@ func NewDiscovery(conf *config.ConsulSDConfig, logger log.Logger) (*Discovery, e
if err != nil {
return nil, err
}
transport := &http.Transport{TLSClientConfig: tls}
transport := &http.Transport{
TLSClientConfig: tls,
DialContext: conntrack.NewDialContextFunc(
conntrack.DialWithTracing(),
conntrack.DialWithName("consul_sd"),
),
}
wrapper := &http.Client{Transport: transport}
clientConf := &consul.Config{

5
discovery/marathon/marathon.go
View file

@ -28,6 +28,7 @@ import (
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/mwitkow/go-conntrack"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/config"
@ -117,6 +118,10 @@ func NewDiscovery(conf *config.MarathonSDConfig, logger log.Logger) (*Discovery,
Timeout: time.Duration(conf.Timeout),
Transport: &http.Transport{
TLSClientConfig: tls,
DialContext: conntrack.NewDialContextFunc(
conntrack.DialWithTracing(),
conntrack.DialWithName("marathon_sd"),
),
},
}

9
discovery/triton/triton.go
View file

@ -22,6 +22,7 @@ import (
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/mwitkow/go-conntrack"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/config"
@ -87,7 +88,13 @@ func New(logger log.Logger, conf *config.TritonSDConfig) (*Discovery, error) {
return nil, err
}
transport := &http.Transport{TLSClientConfig: tls}
transport := &http.Transport{
TLSClientConfig: tls,
DialContext: conntrack.NewDialContextFunc(
conntrack.DialWithTracing(),
conntrack.DialWithName("triton_sd"),
),
}
client := &http.Client{Transport: transport}
return &Discovery{

2
notifier/notifier.go
View file

@ -515,7 +515,7 @@ type alertmanagerSet struct {
}
func newAlertmanagerSet(cfg *config.AlertmanagerConfig, logger log.Logger) (*alertmanagerSet, error) {
client, err := httputil.NewClientFromConfig(cfg.HTTPClientConfig)
client, err := httputil.NewClientFromConfig(cfg.HTTPClientConfig, "alertmanager")
if err != nil {
return nil, err
}

4
retrieval/scrape.go
View file

@ -141,7 +141,7 @@ func newScrapePool(ctx context.Context, cfg *config.ScrapeConfig, app Appendable
logger = log.NewNopLogger()
}
client, err := httputil.NewClientFromConfig(cfg.HTTPClientConfig)
client, err := httputil.NewClientFromConfig(cfg.HTTPClientConfig, cfg.JobName)
if err != nil {
// Any errors that could occur here should be caught during config validation.
level.Error(logger).Log("msg", "Error creating HTTP client", "err", err)
@ -202,7 +202,7 @@ func (sp *scrapePool) reload(cfg *config.ScrapeConfig) {
sp.mtx.Lock()
defer sp.mtx.Unlock()
client, err := httputil.NewClientFromConfig(cfg.HTTPClientConfig)
client, err := httputil.NewClientFromConfig(cfg.HTTPClientConfig, cfg.JobName)
if err != nil {
// Any errors that could occur here should be caught during config validation.
level.Error(sp.logger).Log("msg", "Error creating HTTP client", "err", err)

16
retrieval/target_test.go
View file

@ -151,7 +151,7 @@ func TestNewHTTPBearerToken(t *testing.T) {
cfg := config.HTTPClientConfig{
BearerToken: "1234",
}
c, err := httputil.NewClientFromConfig(cfg)
c, err := httputil.NewClientFromConfig(cfg, "test")
if err != nil {
t.Fatal(err)
}
@ -178,7 +178,7 @@ func TestNewHTTPBearerTokenFile(t *testing.T) {
cfg := config.HTTPClientConfig{
BearerTokenFile: "testdata/bearertoken.txt",
}
c, err := httputil.NewClientFromConfig(cfg)
c, err := httputil.NewClientFromConfig(cfg, "test")
if err != nil {
t.Fatal(err)
}
@ -207,7 +207,7 @@ func TestNewHTTPBasicAuth(t *testing.T) {
Password: "password123",
},
}
c, err := httputil.NewClientFromConfig(cfg)
c, err := httputil.NewClientFromConfig(cfg, "test")
if err != nil {
t.Fatal(err)
}
@ -235,7 +235,7 @@ func TestNewHTTPCACert(t *testing.T) {
CAFile: caCertPath,
},
}
c, err := httputil.NewClientFromConfig(cfg)
c, err := httputil.NewClientFromConfig(cfg, "test")
if err != nil {
t.Fatal(err)
}
@ -269,7 +269,7 @@ func TestNewHTTPClientCert(t *testing.T) {
KeyFile: "testdata/client.key",
},
}
c, err := httputil.NewClientFromConfig(cfg)
c, err := httputil.NewClientFromConfig(cfg, "test")
if err != nil {
t.Fatal(err)
}
@ -298,7 +298,7 @@ func TestNewHTTPWithServerName(t *testing.T) {
ServerName: "prometheus.rocks",
},
}
c, err := httputil.NewClientFromConfig(cfg)
c, err := httputil.NewClientFromConfig(cfg, "test")
if err != nil {
t.Fatal(err)
}
@ -327,7 +327,7 @@ func TestNewHTTPWithBadServerName(t *testing.T) {
ServerName: "badname",
},
}
c, err := httputil.NewClientFromConfig(cfg)
c, err := httputil.NewClientFromConfig(cfg, "test")
if err != nil {
t.Fatal(err)
}
@ -366,7 +366,7 @@ func TestNewClientWithBadTLSConfig(t *testing.T) {
KeyFile: "testdata/nonexistent_client.key",
},
}
_, err := httputil.NewClientFromConfig(cfg)
_, err := httputil.NewClientFromConfig(cfg, "test")
if err == nil {
t.Fatalf("Expected error, got nil.")
}

2
storage/remote/client.go
View file

@ -51,7 +51,7 @@ type clientConfig struct {
// NewClient creates a new Client.
func NewClient(index int, conf *clientConfig) (*Client, error) {
httpClient, err := httputil.NewClientFromConfig(conf.httpClientConfig)
httpClient, err := httputil.NewClientFromConfig(conf.httpClientConfig, "remote_storage")
if err != nil {
return nil, err
}

13
util/httputil/client.go
View file

@ -22,17 +22,18 @@ import (
"strings"
"time"
"github.com/mwitkow/go-conntrack"
"github.com/prometheus/prometheus/config"
)
// NewClient returns a http.Client using the specified http.RoundTripper.
func NewClient(rt http.RoundTripper) *http.Client {
func newClient(rt http.RoundTripper) *http.Client {
return &http.Client{Transport: rt}
}
// NewClientFromConfig returns a new HTTP client configured for the
// given config.HTTPClientConfig.
func NewClientFromConfig(cfg config.HTTPClientConfig) (*http.Client, error) {
// given config.HTTPClientConfig. The name is used as go-conntrack metric label.
func NewClientFromConfig(cfg config.HTTPClientConfig, name string) (*http.Client, error) {
tlsConfig, err := NewTLSConfig(cfg.TLSConfig)
if err != nil {
return nil, err
@ -48,6 +49,10 @@ func NewClientFromConfig(cfg config.HTTPClientConfig) (*http.Client, error) {
// 5 minutes is typically above the maximum sane scrape interval. So we can
// use keepalive for all configurations.
IdleConnTimeout: 5 * time.Minute,
DialContext: conntrack.NewDialContextFunc(
conntrack.DialWithTracing(),
conntrack.DialWithName(name),
),
}
// If a bearer token is provided, create a round tripper that will set the
@ -70,7 +75,7 @@ func NewClientFromConfig(cfg config.HTTPClientConfig) (*http.Client, error) {
}
// Return a new client with the configured round tripper.
return NewClient(rt), nil
return newClient(rt), nil
}
type bearerAuthRoundTripper struct {

4
util/httputil/client_test.go
View file

@ -177,7 +177,7 @@ func TestNewClientFromConfig(t *testing.T) {
}
defer testServer.Close()
client, err := NewClientFromConfig(validConfig.clientConfig)
client, err := NewClientFromConfig(validConfig.clientConfig, "test")
if err != nil {
t.Errorf("Can't create a client from this config: %+v", validConfig.clientConfig)
continue
@ -233,7 +233,7 @@ func TestNewClientFromInvalidConfig(t *testing.T) {
}
for _, invalidConfig := range newClientInvalidConfig {
client, err := NewClientFromConfig(invalidConfig.clientConfig)
client, err := NewClientFromConfig(invalidConfig.clientConfig, "test")
if client != nil {
t.Errorf("A client instance was returned instead of nil using this config: %+v", invalidConfig.clientConfig)
}

201
vendor/github.com/mwitkow/go-conntrack/LICENSE generated vendored Normal file
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@ -0,0 +1,201 @@
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88
vendor/github.com/mwitkow/go-conntrack/README.md generated vendored Normal file
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@ -0,0 +1,88 @@
# Go tracing and monitoring (Prometheus) for `net.Conn`
[![Travis Build](https://travis-ci.org/mwitkow/go-conntrack.svg)](https://travis-ci.org/mwitkow/go-conntrack)
[![Go Report Card](https://goreportcard.com/badge/github.com/mwitkow/go-conntrack)](http://goreportcard.com/report/mwitkow/go-conntrack)
[![GoDoc](http://img.shields.io/badge/GoDoc-Reference-blue.svg)](https://godoc.org/github.com/mwitkow/go-conntrack)
[![Apache 2.0 License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](LICENSE)
[Prometheus](https://prometheus.io/) monitoring and [`x/net/trace`](https://godoc.org/golang.org/x/net/trace#EventLog) tracing wrappers `net.Conn`, both inbound (`net.Listener`) and outbound (`net.Dialer`).
## Why?
Go standard library does a great job of doing "the right" things with your connections: `http.Transport` pools outbound ones, and `http.Server` sets good *Keep Alive* defaults.
However, it is still easy to get it wrong, see the excellent [*The complete guide to Go net/http timeouts*](https://blog.cloudflare.com/the-complete-guide-to-golang-net-http-timeouts/).
That's why you should be able to monitor (using Prometheus) how many connections your Go frontend servers have inbound, and how big are the connection pools to your backends. You should also be able to inspect your connection without `ssh` and `netstat`.
![Events page with connections](https://raw.githubusercontent.com/mwitkow/go-conntrack/images/events.png)
## How to use?
All of these examples can be found in [`example/server.go`](example/server.go):
### Conntrack Dialer for HTTP DefaultClient
Most often people use the default `http.DefaultClient` that uses `http.DefaultTransport`. The easiest way to make sure all your outbound connections monitored and trace is:
```go
http.DefaultTransport.(*http.Transport).DialContext = conntrack.NewDialContextFunc(
conntrack.DialWithTracing(),
conntrack.DialWithDialer(&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
}),
)
```
#### Dialer Name
Tracked outbound connections are organised by *dialer name* (with `default` being default). The *dialer name* is used for monitoring (`dialer_name` label) and tracing (`net.ClientConn.<dialer_name>` family).
You can pass `conntrack.WithDialerName()` to `NewDialContextFunc` to set the name for the dialer. Moreover, you can set the *dialer name* per invocation of the dialer, by passing it in the `Context`. For example using the [`ctxhttp`](https://godoc.org/golang.org/x/net/context/ctxhttp) lib:
```go
callCtx := conntrack.DialNameToContext(parentCtx, "google")
ctxhttp.Get(callCtx, http.DefaultClient, "https://www.google.com")
```
### Conntrack Listener for HTTP Server
Tracked inbound connections are organised by *listener name* (with `default` being default). The *listener name* is used for monitoring (`listener_name` label) and tracing (`net.ServerConn.<listener_name>` family). For example, a simple `http.Server` can be instrumented like this:
```go
listener, err := net.Listen("tcp", fmt.Sprintf(":%d", *port))
listener = conntrack.NewListener(listener,
conntrack.TrackWithName("http"),
conntrack.TrackWithTracing(),
conntrack.TrackWithTcpKeepAlive(5 * time.Minutes))
httpServer.Serve(listener)
```
Note, the `TrackWithTcpKeepAlive`. The default `http.ListenAndServe` adds a tcp keep alive wrapper to inbound TCP connections. `conntrack.NewListener` allows you to do that without another layer of wrapping.
#### TLS server example
The standard lobrary `http.ListenAndServerTLS` does a lot to bootstrap TLS connections, including supporting HTTP2 negotiation. Unfortunately, that is hard to do if you want to provide your own `net.Listener`. That's why this repo comes with `connhelpers` package, which takes care of configuring `tls.Config` for that use case. Here's an example of use:
```go
listener, err := net.Listen("tcp", fmt.Sprintf(":%d", *port))
listener = conntrack.NewListener(listener,
conntrack.TrackWithName("https"),
conntrack.TrackWithTracing(),
conntrack.TrackWithTcpKeepAlive(5 * time.Minutes))
tlsConfig, err := connhelpers.TlsConfigForServerCerts(*tlsCertFilePath, *tlsKeyFilePath)
tlsConfig, err = connhelpers.TlsConfigWithHttp2Enabled(tlsConfig)
tlsListener := tls.NewListener(listener, tlsConfig)
httpServer.Serve(listener)
```
# Status
This code is used by Improbable's HTTP frontending and proxying stack for debuging and monitoring of established user connections.
Additional tooling will be added if needed, and contributions are welcome.
#License
`go-conntrack` is released under the Apache 2.0 license. See the [LICENSE](LICENSE) file for details.

108
vendor/github.com/mwitkow/go-conntrack/dialer_reporter.go generated vendored Normal file
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@ -0,0 +1,108 @@
// Copyright 2016 Michal Witkowski. All Rights Reserved.
// See LICENSE for licensing terms.
package conntrack
import (
"context"
"net"
"os"
"syscall"
prom "github.com/prometheus/client_golang/prometheus"
)
type failureReason string
const (
failedResolution = "resolution"
failedConnRefused = "refused"
failedTimeout = "timeout"
failedUnknown = "unknown"
)
var (
dialerAttemptedTotal = prom.NewCounterVec(
prom.CounterOpts{
Namespace: "net",
Subsystem: "conntrack",
Name: "dialer_conn_attempted_total",
Help: "Total number of connections attempted by the given dialer a given name.",
}, []string{"dialer_name"})
dialerConnEstablishedTotal = prom.NewCounterVec(
prom.CounterOpts{
Namespace: "net",
Subsystem: "conntrack",
Name: "dialer_conn_established_total",
Help: "Total number of connections successfully established by the given dialer a given name.",
}, []string{"dialer_name"})
dialerConnFailedTotal = prom.NewCounterVec(
prom.CounterOpts{
Namespace: "net",
Subsystem: "conntrack",
Name: "dialer_conn_failed_total",
Help: "Total number of connections failed to dial by the dialer a given name.",
}, []string{"dialer_name", "reason"})
dialerConnClosedTotal = prom.NewCounterVec(
prom.CounterOpts{
Namespace: "net",
Subsystem: "conntrack",
Name: "dialer_conn_closed_total",
Help: "Total number of connections closed which originated from the dialer of a given name.",
}, []string{"dialer_name"})
)
func init() {
prom.MustRegister(dialerAttemptedTotal)
prom.MustRegister(dialerConnEstablishedTotal)
prom.MustRegister(dialerConnFailedTotal)
prom.MustRegister(dialerConnClosedTotal)
}
// preRegisterDialerMetrics pre-populates Prometheus labels for the given dialer name, to avoid Prometheus missing labels issue.
func PreRegisterDialerMetrics(dialerName string) {
dialerAttemptedTotal.WithLabelValues(dialerName)
dialerConnEstablishedTotal.WithLabelValues(dialerName)
for _, reason := range []failureReason{failedTimeout, failedResolution, failedConnRefused, failedUnknown} {
dialerConnFailedTotal.WithLabelValues(dialerName, string(reason))
}
dialerConnClosedTotal.WithLabelValues(dialerName)
}
func reportDialerConnAttempt(dialerName string) {
dialerAttemptedTotal.WithLabelValues(dialerName).Inc()
}
func reportDialerConnEstablished(dialerName string) {
dialerConnEstablishedTotal.WithLabelValues(dialerName).Inc()
}
func reportDialerConnClosed(dialerName string) {
dialerConnClosedTotal.WithLabelValues(dialerName).Inc()
}
func reportDialerConnFailed(dialerName string, err error) {
if netErr, ok := err.(*net.OpError); ok {
switch nestErr := netErr.Err.(type) {
case *net.DNSError:
dialerConnFailedTotal.WithLabelValues(dialerName, string(failedResolution)).Inc()
return
case *os.SyscallError:
if nestErr.Err == syscall.ECONNREFUSED {
dialerConnFailedTotal.WithLabelValues(dialerName, string(failedConnRefused)).Inc()
}
dialerConnFailedTotal.WithLabelValues(dialerName, string(failedUnknown)).Inc()
return
}
if netErr.Timeout() {
dialerConnFailedTotal.WithLabelValues(dialerName, string(failedTimeout)).Inc()
}
} else if err == context.Canceled || err == context.DeadlineExceeded {
dialerConnFailedTotal.WithLabelValues(dialerName, string(failedTimeout)).Inc()
return
}
dialerConnFailedTotal.WithLabelValues(dialerName, string(failedUnknown)).Inc()
}

166
vendor/github.com/mwitkow/go-conntrack/dialer_wrapper.go generated vendored Normal file
View file

@ -0,0 +1,166 @@
// Copyright 2016 Michal Witkowski. All Rights Reserved.
// See LICENSE for licensing terms.
package conntrack
import (
"context"
"fmt"
"net"
"sync"
"golang.org/x/net/trace"
)
var (
dialerNameKey = "conntrackDialerKey"
)
type dialerOpts struct {
name string
monitoring bool
tracing bool
parentDialContextFunc dialerContextFunc
}
type dialerOpt func(*dialerOpts)
type dialerContextFunc func(context.Context, string, string) (net.Conn, error)
// DialWithName sets the name of the dialer for tracking and monitoring.
// This is the name for the dialer (default is `default`), but for `NewDialContextFunc` can be overwritten from the
// Context using `DialNameToContext`.
func DialWithName(name string) dialerOpt {
return func(opts *dialerOpts) {
opts.name = name
}
}
// DialWithoutMonitoring turns *off* Prometheus monitoring for this dialer.
func DialWithoutMonitoring() dialerOpt {
return func(opts *dialerOpts) {
opts.monitoring = false
}
}
// DialWithTracing turns *on* the /debug/events tracing of the dial calls.
func DialWithTracing() dialerOpt {
return func(opts *dialerOpts) {
opts.tracing = true
}
}
// DialWithDialer allows you to override the `net.Dialer` instance used to actually conduct the dials.
func DialWithDialer(parentDialer *net.Dialer) dialerOpt {
return DialWithDialContextFunc(parentDialer.DialContext)
}
// DialWithDialContextFunc allows you to override func gets used for the actual dialing. The default is `net.Dialer.DialContext`.
func DialWithDialContextFunc(parentDialerFunc dialerContextFunc) dialerOpt {
return func(opts *dialerOpts) {
opts.parentDialContextFunc = parentDialerFunc
}
}
// DialNameFromContext returns the name of the dialer from the context of the DialContext func, if any.
func DialNameFromContext(ctx context.Context) string {
val, ok := ctx.Value(dialerNameKey).(string)
if !ok {
return ""
}
return val
}
// DialNameToContext returns a context that will contain a dialer name override.
func DialNameToContext(ctx context.Context, dialerName string) context.Context {
return context.WithValue(ctx, dialerNameKey, dialerName)
}
// NewDialContextFunc returns a `DialContext` function that tracks outbound connections.
// The signature is compatible with `http.Tranport.DialContext` and is meant to be used there.
func NewDialContextFunc(optFuncs ...dialerOpt) func(context.Context, string, string) (net.Conn, error) {
opts := &dialerOpts{name: defaultName, monitoring: true, parentDialContextFunc: (&net.Dialer{}).DialContext}
for _, f := range optFuncs {
f(opts)
}
if opts.monitoring {
PreRegisterDialerMetrics(opts.name)
}
return func(ctx context.Context, network string, addr string) (net.Conn, error) {
name := opts.name
if ctxName := DialNameFromContext(ctx); ctxName != "" {
name = ctxName
}
return dialClientConnTracker(ctx, network, addr, name, opts)
}
}
// NewDialFunc returns a `Dial` function that tracks outbound connections.
// The signature is compatible with `http.Tranport.Dial` and is meant to be used there for Go < 1.7.
func NewDialFunc(optFuncs ...dialerOpt) func(string, string) (net.Conn, error) {
dialContextFunc := NewDialContextFunc(optFuncs...)
return func(network string, addr string) (net.Conn, error) {
return dialContextFunc(context.TODO(), network, addr)
}
}
type clientConnTracker struct {
net.Conn
opts *dialerOpts
dialerName string
event trace.EventLog
mu sync.Mutex
}
func dialClientConnTracker(ctx context.Context, network string, addr string, dialerName string, opts *dialerOpts) (net.Conn, error) {
var event trace.EventLog
if opts.tracing {
event = trace.NewEventLog(fmt.Sprintf("net.ClientConn.%s", dialerName), fmt.Sprintf("%v", addr))
}
if opts.monitoring {
reportDialerConnAttempt(dialerName)
}
conn, err := opts.parentDialContextFunc(ctx, network, addr)
if err != nil {
if event != nil {
event.Errorf("failed dialing: %v", err)
event.Finish()
}
if opts.monitoring {
reportDialerConnFailed(dialerName, err)
}
return nil, err
}
if event != nil {
event.Printf("established: %s -> %s", conn.LocalAddr(), conn.RemoteAddr())
}
if opts.monitoring {
reportDialerConnEstablished(dialerName)
}
tracker := &clientConnTracker{
Conn: conn,
opts: opts,
dialerName: dialerName,
event: event,
}
return tracker, nil
}
func (ct *clientConnTracker) Close() error {
err := ct.Conn.Close()
ct.mu.Lock()
if ct.event != nil {
if err != nil {
ct.event.Errorf("failed closing: %v", err)
} else {
ct.event.Printf("closing")
}
ct.event.Finish()
ct.event = nil
}
ct.mu.Unlock()
if ct.opts.monitoring {
reportDialerConnClosed(ct.dialerName)
}
return err
}

43
vendor/github.com/mwitkow/go-conntrack/listener_reporter.go generated vendored Normal file
View file

@ -0,0 +1,43 @@
// Copyright 2016 Michal Witkowski. All Rights Reserved.
// See LICENSE for licensing terms.
package conntrack
import prom "github.com/prometheus/client_golang/prometheus"
var (
listenerAcceptedTotal = prom.NewCounterVec(
prom.CounterOpts{
Namespace: "net",
Subsystem: "conntrack",
Name: "listener_conn_accepted_total",
Help: "Total number of connections opened to the listener of a given name.",
}, []string{"listener_name"})
listenerClosedTotal = prom.NewCounterVec(
prom.CounterOpts{
Namespace: "net",
Subsystem: "conntrack",
Name: "listener_conn_closed_total",
Help: "Total number of connections closed that were made to the listener of a given name.",
}, []string{"listener_name"})
)
func init() {
prom.MustRegister(listenerAcceptedTotal)
prom.MustRegister(listenerClosedTotal)
}
// preRegisterListener pre-populates Prometheus labels for the given listener name, to avoid Prometheus missing labels issue.
func preRegisterListenerMetrics(listenerName string) {
listenerAcceptedTotal.WithLabelValues(listenerName)
listenerClosedTotal.WithLabelValues(listenerName)
}
func reportListenerConnAccepted(listenerName string) {
listenerAcceptedTotal.WithLabelValues(listenerName).Inc()
}
func reportListenerConnClosed(listenerName string) {
listenerClosedTotal.WithLabelValues(listenerName).Inc()
}

137
vendor/github.com/mwitkow/go-conntrack/listener_wrapper.go generated vendored Normal file
View file

@ -0,0 +1,137 @@
// Copyright 2016 Michal Witkowski. All Rights Reserved.
// See LICENSE for licensing terms.
package conntrack
import (
"fmt"
"net"
"sync"
"golang.org/x/net/trace"
"time"
)
const (
defaultName = "default"
)
type listenerOpts struct {
name string
monitoring bool
tracing bool
tcpKeepAlive time.Duration
}
type listenerOpt func(*listenerOpts)
// TrackWithName sets the name of the Listener for use in tracking and monitoring.
func TrackWithName(name string) listenerOpt {
return func(opts *listenerOpts) {
opts.name = name
}
}
// TrackWithoutMonitoring turns *off* Prometheus monitoring for this listener.
func TrackWithoutMonitoring() listenerOpt {
return func(opts *listenerOpts) {
opts.monitoring = false
}
}
// TrackWithTracing turns *on* the /debug/events tracing of the live listener connections.
func TrackWithTracing() listenerOpt {
return func(opts *listenerOpts) {
opts.tracing = true
}
}
// TrackWithTcpKeepAlive makes sure that any `net.TCPConn` that get accepted have a keep-alive.
// This is useful for HTTP servers in order for, for example laptops, to not use up resources on the
// server while they don't utilise their connection.
// A value of 0 disables it.
func TrackWithTcpKeepAlive(keepalive time.Duration) listenerOpt {
return func(opts *listenerOpts) {
opts.tcpKeepAlive = keepalive
}
}
type connTrackListener struct {
net.Listener
opts *listenerOpts
}
// NewListener returns the given listener wrapped in connection tracking listener.
func NewListener(inner net.Listener, optFuncs ...listenerOpt) net.Listener {
opts := &listenerOpts{
name: defaultName,
monitoring: true,
tracing: false,
}
for _, f := range optFuncs {
f(opts)
}
if opts.monitoring {
preRegisterListenerMetrics(opts.name)
}
return &connTrackListener{
Listener: inner,
opts: opts,
}
}
func (ct *connTrackListener) Accept() (net.Conn, error) {
// TODO(mwitkow): Add monitoring of failed accept.
conn, err := ct.Listener.Accept()
if err != nil {
return nil, err
}
if tcpConn, ok := conn.(*net.TCPConn); ok && ct.opts.tcpKeepAlive > 0 {
tcpConn.SetKeepAlive(true)
tcpConn.SetKeepAlivePeriod(ct.opts.tcpKeepAlive)
}
return newServerConnTracker(conn, ct.opts), nil
}
type serverConnTracker struct {
net.Conn
opts *listenerOpts
event trace.EventLog
mu sync.Mutex
}
func newServerConnTracker(inner net.Conn, opts *listenerOpts) net.Conn {
tracker := &serverConnTracker{
Conn: inner,
opts: opts,
}
if opts.tracing {
tracker.event = trace.NewEventLog(fmt.Sprintf("net.ServerConn.%s", opts.name), fmt.Sprintf("%v", inner.RemoteAddr()))
tracker.event.Printf("accepted: %v -> %v", inner.RemoteAddr(), inner.LocalAddr())
}
if opts.monitoring {
reportListenerConnAccepted(opts.name)
}
return tracker
}
func (ct *serverConnTracker) Close() error {
err := ct.Conn.Close()
ct.mu.Lock()
if ct.event != nil {
if err != nil {
ct.event.Errorf("failed closing: %v", err)
} else {
ct.event.Printf("closing")
}
ct.event.Finish()
ct.event = nil
}
ct.mu.Unlock()
if ct.opts.monitoring {
reportListenerConnClosed(ct.opts.name)
}
return err
}

6
vendor/vendor.json vendored
View file

@ -719,6 +719,12 @@
"revision": "672033dedc09500ca4d340760d0b80b9c0b198bd",
"revisionTime": "2017-02-13T20:16:50Z"
},
{
"checksumSHA1": "ZYfqG6bNE3cRlbsvpJBL0bF6DSc=",
"path": "github.com/mwitkow/go-conntrack",
"revision": "cc309e4a22231782e8893f3c35ced0967807a33e",
"revisionTime": "2016-11-29T09:58:57Z"
},
{
"checksumSHA1": "aCtmlyAgau9n0UHs8Pk+3xfIaVk=",
"path": "github.com/nightlyone/lockfile",

12
web/web.go
View file

@ -51,6 +51,7 @@ import (
"golang.org/x/net/context"
"golang.org/x/net/netutil"
"github.com/mwitkow/go-conntrack"
"github.com/prometheus/prometheus/config"
"github.com/prometheus/prometheus/notifier"
"github.com/prometheus/prometheus/pkg/labels"
@ -377,14 +378,19 @@ func (h *Handler) Reload() <-chan chan error {
func (h *Handler) Run(ctx context.Context) error {
level.Info(h.logger).Log("msg", "Start listening for connections", "address", h.options.ListenAddress)
l, err := net.Listen("tcp", h.options.ListenAddress)
listener, err := net.Listen("tcp", h.options.ListenAddress)
if err != nil {
return err
}
l = netutil.LimitListener(l, h.options.MaxConnections)
listener = netutil.LimitListener(listener, h.options.MaxConnections)
// Monitor incoming connections with conntrack.
listener = conntrack.NewListener(listener,
conntrack.TrackWithName("http"),
conntrack.TrackWithTracing())
var (
m = cmux.New(l)
m = cmux.New(listener)
grpcl = m.Match(cmux.HTTP2HeaderField("content-type", "application/grpc"))
httpl = m.Match(cmux.HTTP1Fast())
grpcSrv = grpc.NewServer()