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📄 .gitignore # Created by .ignore support plugin (hsz.mobi) ### JetBrains template # Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and Webstorm # Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839 # User-specific stuff: .idea .idea/workspace.xml .idea/tasks.xml .idea/dictionaries .idea/vcs.xml .idea/jsLibraryMappings.xml # Sensitive or high-churn files: .idea/dataSources.ids .idea/dataSources.xml .idea/dataSources.local.xml .idea/sqlDataSources.xml .idea/dynamic.xml .idea/uiDesigner.xml # Gradle: .idea/gradle.xml .idea/libraries # Mongo Explorer plugin: .idea/mongoSettings.xml ## File-based project format: .iws ## Plugin-specific files: # IntelliJ /out/ # mpeltonen/sbt-idea plugin .idea_modules/ # JIRA plugin atlassian-ide-plugin.xml # Crashlytics plugin (for Android Studio and IntelliJ) com_crashlytics_export_strings.xml crashlytics.properties crashlytics-build.properties fabric.properties ### Go template # Compiled Object files, Static and Dynamic libs (Shared Objects) .o .a .so # Folders _obj _test # Architecture specific extensions/prefixes .[568vq] [568vq].out .cgo1.go .cgo2.c _cgo_defun.c _cgo_gotypes.go _cgo_export. _testmain.go .exe .test .prof ### Python template # Byte-compiled / optimized / DLL files __pycache__/ .py[cod] $py.class # C extensions .so # Distribution / packaging .Python env/ build/ develop-eggs/ dist/ downloads/ eggs/ .eggs/ lib/ lib64/ parts/ sdist/ var/ .egg-info/ .installed.cfg .egg # PyInstaller # Usually these files are written by a python script from a template # before PyInstaller builds the exe, so as to inject date/other infos into it. .manifest .spec # Installer logs pip-log.txt pip-delete-this-directory.txt # Unit test / coverage reports htmlcov/ .tox/ .coverage .coverage.* .cache nosetests.xml coverage.xml ,cover .hypothesis/ # Translations .mo .pot # Django stuff: .log local_settings.py # Flask stuff: instance/ .webassets-cache # Scrapy stuff: .scrapy # Sphinx documentation docs/_build/ # PyBuilder target/ # IPython Notebook .ipynb_checkpoints # pyenv .python-version # celery beat schedule file celerybeat-schedule # dotenv .env # virtualenv venv/ ENV/ # Spyder project settings .spyderproject # Rope project settings .ropeproject	2.27 KB	2025-05-25 12:27
📄 .travis.yml sudo: false language: go go: - "1.8" - "1.9" - "1.10" - "1.11" - "1.12" install: - go get github.com/stretchr/testify - go get github.com/prometheus/client_golang/prometheus - go get golang.org/x/net/context - go get golang.org/x/net/trace script: - go test -v ./...	269 B	2025-05-25 12:27
📄 LICENSE Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. "License" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document. "Licensor" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License. "Legal Entity" shall mean the union of the acting entity and all other entities that control, are controlled by, or are under common control with that entity. For the purposes of this definition, "control" means (i) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the outstanding shares, or (iii) beneficial ownership of such entity. "You" (or "Your") shall mean an individual or Legal Entity exercising permissions granted by this License. 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The contents of the NOTICE file are for informational purposes only and do not modify the License. You may add Your own attribution notices within Derivative Works that You distribute, alongside or as an addendum to the NOTICE text from the Work, provided that such additional attribution notices cannot be construed as modifying the License. You may add Your own copyright statement to Your modifications and may provide additional or different license terms and conditions for use, reproduction, or distribution of Your modifications, or for any such Derivative Works as a whole, provided Your use, reproduction, and distribution of the Work otherwise complies with the conditions stated in this License. 5. Submission of Contributions. Unless You explicitly state otherwise, any Contribution intentionally submitted for inclusion in the Work by You to the Licensor shall be under the terms and conditions of this License, without any additional terms or conditions. Notwithstanding the above, nothing herein shall supersede or modify the terms of any separate license agreement you may have executed with Licensor regarding such Contributions. 6. Trademarks. This License does not grant permission to use the trade names, trademarks, service marks, or product names of the Licensor, except as required for reasonable and customary use in describing the origin of the Work and reproducing the content of the NOTICE file. 7. Disclaimer of Warranty. Unless required by applicable law or agreed to in writing, Licensor provides the Work (and each Contributor provides its Contributions) on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied, including, without limitation, any warranties or conditions of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A PARTICULAR PURPOSE. You are solely responsible for determining the appropriateness of using or redistributing the Work and assume any risks associated with Your exercise of permissions under this License. 8. Limitation of Liability. In no event and under no legal theory, whether in tort (including negligence), contract, or otherwise, unless required by applicable law (such as deliberate and grossly negligent acts) or agreed to in writing, shall any Contributor be liable to You for damages, including any direct, indirect, special, incidental, or consequential damages of any character arising as a result of this License or out of the use or inability to use the Work (including but not limited to damages for loss of goodwill, work stoppage, computer failure or malfunction, or any and all other commercial damages or losses), even if such Contributor has been advised of the possibility of such damages. 9. Accepting Warranty or Additional Liability. While redistributing the Work or Derivative Works thereof, You may choose to offer, and charge a fee for, acceptance of support, warranty, indemnity, or other liability obligations and/or rights consistent with this License. However, in accepting such obligations, You may act only on Your own behalf and on Your sole responsibility, not on behalf of any other Contributor, and only if You agree to indemnify, defend, and hold each Contributor harmless for any liability incurred by, or claims asserted against, such Contributor by reason of your accepting any such warranty or additional liability. END OF TERMS AND CONDITIONS APPENDIX: How to apply the Apache License to your work. To apply the Apache License to your work, attach the following boilerplate notice, with the fields enclosed by brackets "{}" replaced with your own identifying information. (Don't include the brackets!) The text should be enclosed in the appropriate comment syntax for the file format. We also recommend that a file or class name and description of purpose be included on the same "printed page" as the copyright notice for easier identification within third-party archives. Copyright {yyyy} {name of copyright owner} 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.	11.09 KB	2025-05-25 12:27
📄 README.md # 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.	4.57 KB	2025-05-25 12:27
📁 connhelpers	-	2025-05-25 12:27
📄 dialer_reporter.go // 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() }	3.38 KB	2025-05-25 12:27
📄 dialer_test.go // Copyright 2016 Michal Witkowski. All Rights Reserved. // See LICENSE for licensing terms. package conntrack_test import ( "context" "net" "net/http" "testing" "time" "github.com/mwitkow/go-conntrack" "github.com/stretchr/testify/assert" "github.com/stretchr/testify/require" "github.com/stretchr/testify/suite" ) func TestDialerWrapper(t testing.T) { suite.Run(t, &DialerTestSuite{}) } type DialerTestSuite struct { suite.Suite serverListener net.Listener httpServer http.Server } func (s DialerTestSuite) SetupSuite() { var err error s.serverListener, err = net.Listen("tcp", "127.0.0.1:0") require.NoError(s.T(), err, "must be able to allocate a port for serverListener") s.httpServer = http.Server{ Handler: http.HandlerFunc(func(resp http.ResponseWriter, req http.Request) { resp.WriteHeader(http.StatusOK) }), } go func() { s.httpServer.Serve(s.serverListener) }() } func (s DialerTestSuite) TestDialerMetricsArePreregistered() { conntrack.NewDialContextFunc() // dialer name = default conntrack.NewDialContextFunc(conntrack.DialWithName("foobar")) conntrack.PreRegisterDialerMetrics("something_manual") for testId, testCase := range []struct { metricName string existingLabels []string }{ {"net_conntrack_dialer_conn_attempted_total", []string{"default"}}, {"net_conntrack_dialer_conn_attempted_total", []string{"foobar"}}, {"net_conntrack_dialer_conn_attempted_total", []string{"something_manual"}}, {"net_conntrack_dialer_conn_closed_total", []string{"default"}}, {"net_conntrack_dialer_conn_closed_total", []string{"foobar"}}, {"net_conntrack_dialer_conn_closed_total", []string{"something_manual"}}, {"net_conntrack_dialer_conn_established_total", []string{"default"}}, {"net_conntrack_dialer_conn_established_total", []string{"foobar"}}, {"net_conntrack_dialer_conn_established_total", []string{"something_manual"}}, {"net_conntrack_dialer_conn_failed_total", []string{"default", "resolution"}}, {"net_conntrack_dialer_conn_failed_total", []string{"default", "refused"}}, {"net_conntrack_dialer_conn_failed_total", []string{"default", "timeout"}}, {"net_conntrack_dialer_conn_failed_total", []string{"default", "unknown"}}, } { lineCount := len(fetchPrometheusLines(s.T(), testCase.metricName, testCase.existingLabels...)) assert.NotEqual(s.T(), 0, lineCount, "metrics must exist for test case %d", testId) } } func (s DialerTestSuite) TestDialerMetricsAreNotPreregisteredWithMonitoringOff() { conntrack.NewDialContextFunc(conntrack.DialWithName("nomon"), conntrack.DialWithoutMonitoring()) for testId, testCase := range []struct { metricName string existingLabels []string }{ {"net_conntrack_dialer_conn_attempted_total", []string{"nomon"}}, {"net_conntrack_dialer_conn_closed_total", []string{"nomon"}}, {"net_conntrack_dialer_conn_established_total", []string{"nomon"}}, {"net_conntrack_dialer_conn_failed_total", []string{"nomon", "resolution"}}, {"net_conntrack_dialer_conn_failed_total", []string{"nomon", "refused"}}, {"net_conntrack_dialer_conn_failed_total", []string{"nomon", "timeout"}}, {"net_conntrack_dialer_conn_failed_total", []string{"nomon", "unknown"}}, } { lineCount := len(fetchPrometheusLines(s.T(), testCase.metricName, testCase.existingLabels...)) assert.Equal(s.T(), 0, lineCount, "metrics should not be registered exist for test case %d", testId) } } func (s DialerTestSuite) TestDialerUnderNormalConnection() { dialFunc := conntrack.NewDialContextFunc(conntrack.DialWithName("normal_conn")) beforeAttempts := sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_attempted_total", "normal_conn") beforeEstablished := sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_established_total", "normal_conn") beforeClosed := sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_closed_total", "normal_conn") conn, err := dialFunc(context.TODO(), "tcp", s.serverListener.Addr().String()) require.NoError(s.T(), err, "NewDialContextFunc should successfully establish a conn here") assert.Equal(s.T(), beforeAttempts+1, sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_attempted_total", "normal_conn"), "the attempted conn counter must be incremented after connection was opened") assert.Equal(s.T(), beforeEstablished+1, sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_established_total", "normal_conn"), "the established conn counter must be incremented after connection was opened") assert.Equal(s.T(), beforeClosed, sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_closed_total", "normal_conn"), "the closed conn counter must not be incremented after connection was opened") conn.Close() assert.Equal(s.T(), beforeClosed+1, sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_established_total", "normal_conn"), "the closed conn counter must be incremented after connection was closed") } func (s DialerTestSuite) TestDialerWithContextName() { dialFunc := conntrack.NewDialContextFunc() conntrack.PreRegisterDialerMetrics("ctx_conn") beforeAttempts := sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_attempted_total", "ctx_conn") beforeEstablished := sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_established_total", "ctx_conn") beforeClosed := sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_closed_total", "ctx_conn") conn, err := dialFunc(conntrack.DialNameToContext(context.TODO(), "ctx_conn"), "tcp", s.serverListener.Addr().String()) require.NoError(s.T(), err, "NewDialContextFunc should successfully establish a conn here") assert.Equal(s.T(), beforeAttempts+1, sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_attempted_total", "ctx_conn"), "the attempted conn counter must be incremented after connection was opened") assert.Equal(s.T(), beforeEstablished+1, sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_established_total", "ctx_conn"), "the established conn counter must be incremented after connection was opened") assert.Equal(s.T(), beforeClosed, sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_closed_total", "ctx_conn"), "the closed conn counter must not be incremented after connection was opened") conn.Close() assert.Equal(s.T(), beforeClosed+1, sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_established_total", "ctx_conn"), "the closed conn counter must be incremented after connection was closed") } func (s ListenerTestSuite) TestDialerTracingCapturedInPage() { dialFunc := conntrack.NewDialContextFunc(conntrack.DialWithTracing()) dialerName := "some_dialer" conn, err := dialFunc(conntrack.DialNameToContext(context.TODO(), dialerName), "tcp", s.serverListener.Addr().String()) time.Sleep(5 * time.Millisecond) require.NoError(s.T(), err, "DialContext should successfully establish a conn here") assert.Contains(s.T(), fetchTraceEvents(s.T(), "net.ClientConn."+dialerName), conn.LocalAddr().String(), "the /debug/trace/events page must contain the live connection") time.Sleep(5 * time.Millisecond) conn.Close() } func (s DialerTestSuite) TestDialerResolutionFailure() { dialFunc := conntrack.NewDialContextFunc(conntrack.DialWithName("res_err")) beforeAttempts := sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_attempted_total", "res_err") beforeEstablished := sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_established_total", "res_err") beforeResolutionErrors := sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_failed_total", "res_err", "resolution") beforeClosed := sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_closed_total", "res_err") _, err := dialFunc(context.TODO(), "tcp", "dialer.test.wrong.domain.wrong:443") require.Error(s.T(), err, "NewDialContextFunc should fail here") assert.Equal(s.T(), beforeAttempts+1, sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_attempted_total", "res_err"), "the attempted conn counter must be incremented after connection was opened") assert.Equal(s.T(), beforeEstablished, sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_established_total", "res_err"), "the established conn counter must not be incremented on a failure") assert.Equal(s.T(), beforeClosed, sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_closed_total", "res_err"), "the closed conn counter must not be incremented on a failure") assert.Equal(s.T(), beforeResolutionErrors+1, sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_failed_total", "res_err", "resolution"), "the failure counter for resolution error should be incremented") } func (s DialerTestSuite) TestDialerRefusedFailure() { dialFunc := conntrack.NewDialContextFunc(conntrack.DialWithName("ref_err")) beforeAttempts := sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_attempted_total", "ref_err") beforeEstablished := sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_established_total", "ref_err") beforeResolutionErrors := sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_failed_total", "ref_err", "resolution") beforeClosed := sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_closed_total", "ref_err") _, err := dialFunc(context.TODO(), "tcp", "127.0.0.1:337") // 337 is a cool port, let's hope its unused. require.Error(s.T(), err, "NewDialContextFunc should fail here") assert.Equal(s.T(), beforeAttempts+1, sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_attempted_total", "ref_err"), "the attempted conn counter must be incremented after connection was opened") assert.Equal(s.T(), beforeEstablished, sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_established_total", "ref_err"), "the established conn counter must not be incremented on a failure") assert.Equal(s.T(), beforeClosed, sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_closed_total", "ref_err"), "the closed conn counter must not be incremented on a failure") assert.Equal(s.T(), beforeResolutionErrors+1, sumCountersForMetricAndLabels(s.T(), "net_conntrack_dialer_conn_failed_total", "ref_err", "refused"), "the failure counter for connection refused error should be incremented") } func (s *DialerTestSuite) TearDownSuite() { if s.serverListener != nil { s.T().Logf("stopped http.Server at: %v", s.serverListener.Addr().String()) s.serverListener.Close() } }	10.3 KB	2025-05-25 12:27
📄 dialer_wrapper.go // 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 }	4.64 KB	2025-05-25 12:27
📁 example	-	2025-05-25 12:27
📄 listener_reporter.go // 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() }	1.33 KB	2025-05-25 12:27
📄 listener_test.go // Copyright 2016 Michal Witkowski. All Rights Reserved. // See LICENSE for licensing terms. package conntrack_test import ( "net" "net/http" "testing" "context" "time" "github.com/mwitkow/go-conntrack" "github.com/stretchr/testify/assert" "github.com/stretchr/testify/require" "github.com/stretchr/testify/suite" ) func TestListenerTestSuite(t testing.T) { suite.Run(t, &ListenerTestSuite{}) } var ( listenerName = "some_name" ) type ListenerTestSuite struct { suite.Suite serverListener net.Listener httpServer http.Server } func (s ListenerTestSuite) SetupSuite() { var err error s.serverListener, err = net.Listen("tcp", "127.0.0.1:0") require.NoError(s.T(), err, "must be able to allocate a port for serverListener") s.serverListener = conntrack.NewListener(s.serverListener, conntrack.TrackWithName(listenerName), conntrack.TrackWithTracing()) s.httpServer = http.Server{ Handler: http.HandlerFunc(func(resp http.ResponseWriter, req http.Request) { resp.WriteHeader(http.StatusOK) }), } go func() { s.httpServer.Serve(s.serverListener) }() } func (s ListenerTestSuite) TestTrackingMetricsPreregistered() { // this will create the default listener, check if it is registered conntrack.NewListener(s.serverListener) for testId, testCase := range []struct { metricName string existingLabels []string }{ {"net_conntrack_listener_conn_accepted_total", []string{"default"}}, {"net_conntrack_listener_conn_closed_total", []string{"default"}}, {"net_conntrack_listener_conn_accepted_total", []string{listenerName}}, {"net_conntrack_listener_conn_closed_total", []string{listenerName}}, } { lineCount := len(fetchPrometheusLines(s.T(), testCase.metricName, testCase.existingLabels...)) assert.NotEqual(s.T(), 0, lineCount, "metrics must exist for test case %d", testId) } } func (s ListenerTestSuite) TestMonitoringNormalConns() { beforeAccepted := sumCountersForMetricAndLabels(s.T(), "net_conntrack_listener_conn_accepted_total", listenerName) beforeClosed := sumCountersForMetricAndLabels(s.T(), "net_conntrack_listener_conn_closed_total", listenerName) conn, err := (&net.Dialer{}).DialContext(context.TODO(), "tcp", s.serverListener.Addr().String()) require.NoError(s.T(), err, "DialContext should successfully establish a conn here") assert.Equal(s.T(), beforeAccepted+1, sumCountersForMetricAndLabels(s.T(), "net_conntrack_listener_conn_accepted_total", listenerName), "the accepted conn counter must be incremented after connection was opened") assert.Equal(s.T(), beforeClosed, sumCountersForMetricAndLabels(s.T(), "net_conntrack_listener_conn_closed_total", listenerName), "the closed conn counter must not be incremented before the connection is closed") conn.Close() assert.Equal(s.T(), beforeClosed+1, sumCountersForMetricAndLabels(s.T(), "net_conntrack_listener_conn_closed_total", listenerName), "the closed conn counter must be incremented after connection was closed") } func (s ListenerTestSuite) TestTracingNormalComms() { conn, err := (&net.Dialer{}).DialContext(context.TODO(), "tcp", s.serverListener.Addr().String()) require.NoError(s.T(), err, "DialContext should successfully establish a conn here") time.Sleep(5 * time.Millisecond) assert.Contains(s.T(), fetchTraceEvents(s.T(), "net.ServerConn."+listenerName), conn.LocalAddr().String(), "the /debug/trace/events page must contain the live connection") time.Sleep(5 * time.Millisecond) conn.Close() } func (s *ListenerTestSuite) TearDownSuite() { if s.serverListener != nil { s.T().Logf("stopped http.Server at: %v", s.serverListener.Addr().String()) s.serverListener.Close() } }	3.58 KB	2025-05-25 12:27
📄 listener_wrapper.go // Copyright 2016 Michal Witkowski. All Rights Reserved. // See LICENSE for licensing terms. package conntrack import ( "fmt" "net" "sync" "time" "github.com/jpillora/backoff" "golang.org/x/net/trace" ) const ( defaultName = "default" ) type listenerOpts struct { name string monitoring bool tracing bool tcpKeepAlive time.Duration retryBackoff backoff.Backoff } 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 } } // TrackWithRetries enables retrying of temporary Accept() errors, with the given backoff between attempts. // Concurrent accept calls that receive temporary errors have independent backoff scaling. func TrackWithRetries(b backoff.Backoff) listenerOpt { return func(opts listenerOpts) { opts.retryBackoff = &b } } // 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. var ( conn net.Conn err error ) for attempt := 0; ; attempt++ { conn, err = ct.Listener.Accept() if err == nil \|\| ct.opts.retryBackoff == nil { break } if t, ok := err.(interface{ Temporary() bool }); !ok \|\| !t.Temporary() { break } time.Sleep(ct.opts.retryBackoff.ForAttempt(float64(attempt))) } 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 }	3.74 KB	2025-05-25 12:27
📄 promhelper_test.go package conntrack_test import ( "bufio" "io" "net/http" "net/http/httptest" "strconv" "strings" "testing" "github.com/prometheus/client_golang/prometheus/promhttp" "github.com/stretchr/testify/require" ) func fetchPrometheusLines(t testing.T, metricName string, matchingLabelValues ...string) []string { resp := httptest.NewRecorder() req, err := http.NewRequest("GET", "/", nil) require.NoError(t, err, "failed creating request for Prometheus handler") promhttp.Handler().ServeHTTP(resp, req) reader := bufio.NewReader(resp.Body) ret := []string{} for { line, err := reader.ReadString('\n') if err == io.EOF { break } else { require.NoError(t, err, "error reading stuff") } if !strings.HasPrefix(line, metricName) { continue } matches := true for _, labelValue := range matchingLabelValues { if !strings.Contains(line, `"`+labelValue+`"`) { matches = false } } if matches { ret = append(ret, line) } } return ret } func sumCountersForMetricAndLabels(t testing.T, metricName string, matchingLabelValues ...string) int { count := 0 for _, line := range fetchPrometheusLines(t, metricName, matchingLabelValues...) { valueString := line[strings.LastIndex(line, " ")+1 : len(line)-1] valueFloat, err := strconv.ParseFloat(valueString, 32) require.NoError(t, err, "failed parsing value for line: %v", line) count += int(valueFloat) } return count }	1.39 KB	2025-05-25 12:27
📄 tracehelper_test.go package conntrack_test import ( "fmt" "io/ioutil" "net/http" "net/http/httptest" "testing" "github.com/stretchr/testify/require" "golang.org/x/net/trace" ) func fetchTraceEvents(t *testing.T, familyName string) string { resp := httptest.NewRecorder() url := fmt.Sprintf("/debug/events?fam=%s&b=0&exp=1", familyName) req, err := http.NewRequest("GET", url, nil) require.NoError(t, err, "failed creating request for Prometheus handler") trace.RenderEvents(resp, req, true) out, err := ioutil.ReadAll(resp.Body) require.NoError(t, err, "failed reading the trace page") return string(out) }	605 B	2025-05-25 12:27

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