Lucas Servén Marín
GitHub
commit
0ddeea3d78
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@ -27,10 +27,10 @@ import (
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"github.com/go-kit/kit/log"
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"github.com/go-kit/kit/log/level"
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"github.com/metalmatze/signal/internalserver"
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"github.com/oklog/run"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/collectors"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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"github.com/spf13/cobra"
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apiextensions "k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset"
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"k8s.io/client-go/kubernetes"
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@ -251,18 +251,21 @@ func runRoot(_ *cobra.Command, _ []string) error {
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var g run.Group
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{
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h := internalserver.NewHandler(
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internalserver.WithName("Internal Kilo API"),
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internalserver.WithPrometheusRegistry(registry),
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internalserver.WithPProf(),
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)
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h.AddEndpoint("/health", "Exposes health checks", healthHandler)
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h.AddEndpoint("/graph", "Exposes Kilo mesh topology graph", (&graphHandler{m, gr, &hostname, s}).ServeHTTP)
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// Run the HTTP server.
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mux := http.NewServeMux()
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mux.HandleFunc("/health", healthHandler)
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mux.Handle("/graph", &graphHandler{m, gr, &hostname, s})
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mux.Handle("/metrics", promhttp.HandlerFor(registry, promhttp.HandlerOpts{}))
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l, err := net.Listen("tcp", listen)
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if err != nil {
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return fmt.Errorf("failed to listen on %s: %v", listen, err)
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}
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g.Add(func() error {
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if err := http.Serve(l, mux); err != nil && err != http.ErrServerClosed {
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if err := http.Serve(l, h); err != nil && err != http.ErrServerClosed {
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return fmt.Errorf("error: server exited unexpectedly: %v", err)
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}
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return nil
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1
go.mod
1
go.mod
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@ -10,6 +10,7 @@ require (
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github.com/coreos/go-iptables v0.6.0
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github.com/go-kit/kit v0.9.0
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github.com/kylelemons/godebug v0.0.0-20170820004349-d65d576e9348
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github.com/metalmatze/signal v0.0.0-20210307161603-1c9aa721a97a
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github.com/oklog/run v1.1.0
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github.com/prometheus/client_golang v1.11.0
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github.com/spf13/cobra v1.1.3
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|
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8
go.sum
8
go.sum
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@ -32,6 +32,8 @@ github.com/Azure/go-autorest/logger v0.2.0/go.mod h1:T9E3cAhj2VqvPOtCYAvby9aBXkZ
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github.com/Azure/go-autorest/tracing v0.6.0/go.mod h1:+vhtPC754Xsa23ID7GlGsrdKBpUA79WCAKPPZVC2DeU=
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github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
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github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
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github.com/DATA-DOG/go-sqlmock v1.4.1 h1:ThlnYciV1iM/V0OSF/dtkqWb6xo5qITT1TJBG1MRDJM=
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github.com/DATA-DOG/go-sqlmock v1.4.1/go.mod h1:f/Ixk793poVmq4qj/V1dPUg2JEAKC73Q5eFN3EC/SaM=
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github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
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github.com/NYTimes/gziphandler v1.1.1/go.mod h1:n/CVRwUEOgIxrgPvAQhUUr9oeUtvrhMomdKFjzJNB0c=
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github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
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@ -253,6 +255,7 @@ github.com/jsimonetti/rtnetlink v0.0.0-20210525051524-4cc836578190 h1:iycCSDo8EK
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github.com/jsimonetti/rtnetlink v0.0.0-20210525051524-4cc836578190/go.mod h1:NmKSdU4VGSiv1bMsdqNALI4RSvvjtz65tTMCnD05qLo=
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github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
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github.com/json-iterator/go v1.1.7/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
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github.com/json-iterator/go v1.1.9/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
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github.com/json-iterator/go v1.1.10/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
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github.com/json-iterator/go v1.1.11 h1:uVUAXhF2To8cbw/3xN3pxj6kk7TYKs98NIrTqPlMWAQ=
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github.com/json-iterator/go v1.1.11/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
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@ -310,6 +313,8 @@ github.com/mdlayher/netlink v1.4.1/go.mod h1:e4/KuJ+s8UhfUpO9z00/fDZZmhSrs+oxyqA
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github.com/mdlayher/socket v0.0.0-20210307095302-262dc9984e00/go.mod h1:GAFlyu4/XV68LkQKYzKhIo/WW7j3Zi0YRAz/BOoanUc=
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github.com/mdlayher/socket v0.0.0-20211102153432-57e3fa563ecb h1:2dC7L10LmTqlyMVzFJ00qM25lqESg9Z4u3GuEXN5iHY=
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github.com/mdlayher/socket v0.0.0-20211102153432-57e3fa563ecb/go.mod h1:nFZ1EtZYK8Gi/k6QNu7z7CgO20i/4ExeQswwWuPmG/g=
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github.com/metalmatze/signal v0.0.0-20210307161603-1c9aa721a97a h1:0usWxe5SGXKQovz3p+BiQ81Jy845xSMu2CWKuXsXuUM=
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github.com/metalmatze/signal v0.0.0-20210307161603-1c9aa721a97a/go.mod h1:3OETvrxfELvGsU2RoGGWercfeZ4bCL3+SOwzIWtJH/Q=
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github.com/miekg/dns v1.0.14/go.mod h1:W1PPwlIAgtquWBMBEV9nkV9Cazfe8ScdGz/Lj7v3Nrg=
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github.com/mikioh/ipaddr v0.0.0-20190404000644-d465c8ab6721 h1:RlZweED6sbSArvlE924+mUcZuXKLBHA35U7LN621Bws=
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github.com/mikioh/ipaddr v0.0.0-20190404000644-d465c8ab6721/go.mod h1:Ickgr2WtCLZ2MDGd4Gr0geeCH5HybhRJbonOgQpvSxc=
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@ -371,6 +376,7 @@ github.com/pquerna/cachecontrol v0.0.0-20171018203845-0dec1b30a021/go.mod h1:prY
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github.com/prometheus/client_golang v0.9.1/go.mod h1:7SWBe2y4D6OKWSNQJUaRYU/AaXPKyh/dDVn+NZz0KFw=
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github.com/prometheus/client_golang v0.9.3/go.mod h1:/TN21ttK/J9q6uSwhBd54HahCDft0ttaMvbicHlPoso=
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github.com/prometheus/client_golang v1.0.0/go.mod h1:db9x61etRT2tGnBNRi70OPL5FsnadC4Ky3P0J6CfImo=
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github.com/prometheus/client_golang v1.5.1/go.mod h1:e9GMxYsXl05ICDXkRhurwBS4Q3OK1iX/F2sw+iXX5zU=
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github.com/prometheus/client_golang v1.7.1/go.mod h1:PY5Wy2awLA44sXw4AOSfFBetzPP4j5+D6mVACh+pe2M=
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github.com/prometheus/client_golang v1.11.0 h1:HNkLOAEQMIDv/K+04rukrLx6ch7msSRwf3/SASFAGtQ=
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github.com/prometheus/client_golang v1.11.0/go.mod h1:Z6t4BnS23TR94PD6BsDNk8yVqroYurpAkEiz0P2BEV0=
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@ -382,12 +388,14 @@ github.com/prometheus/client_model v0.2.0/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6T
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github.com/prometheus/common v0.0.0-20181113130724-41aa239b4cce/go.mod h1:daVV7qP5qjZbuso7PdcryaAu0sAZbrN9i7WWcTMWvro=
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github.com/prometheus/common v0.4.0/go.mod h1:TNfzLD0ON7rHzMJeJkieUDPYmFC7Snx/y86RQel1bk4=
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github.com/prometheus/common v0.4.1/go.mod h1:TNfzLD0ON7rHzMJeJkieUDPYmFC7Snx/y86RQel1bk4=
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github.com/prometheus/common v0.9.1/go.mod h1:yhUN8i9wzaXS3w1O07YhxHEBxD+W35wd8bs7vj7HSQ4=
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github.com/prometheus/common v0.10.0/go.mod h1:Tlit/dnDKsSWFlCLTWaA1cyBgKHSMdTB80sz/V91rCo=
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github.com/prometheus/common v0.26.0 h1:iMAkS2TDoNWnKM+Kopnx/8tnEStIfpYA0ur0xQzzhMQ=
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github.com/prometheus/common v0.26.0/go.mod h1:M7rCNAaPfAosfx8veZJCuw84e35h3Cfd9VFqTh1DIvc=
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github.com/prometheus/procfs v0.0.0-20181005140218-185b4288413d/go.mod h1:c3At6R/oaqEKCNdg8wHV1ftS6bRYblBhIjjI8uT2IGk=
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github.com/prometheus/procfs v0.0.0-20190507164030-5867b95ac084/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
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github.com/prometheus/procfs v0.0.2/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
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github.com/prometheus/procfs v0.0.8/go.mod h1:7Qr8sr6344vo1JqZ6HhLceV9o3AJ1Ff+GxbHq6oeK9A=
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github.com/prometheus/procfs v0.1.3/go.mod h1:lV6e/gmhEcM9IjHGsFOCxxuZ+z1YqCvr4OA4YeYWdaU=
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github.com/prometheus/procfs v0.2.0/go.mod h1:lV6e/gmhEcM9IjHGsFOCxxuZ+z1YqCvr4OA4YeYWdaU=
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github.com/prometheus/procfs v0.6.0 h1:mxy4L2jP6qMonqmq+aTtOx1ifVWUgG/TAmntgbh3xv4=
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|
|
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@ -0,0 +1,201 @@
|
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Apache License
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Version 2.0, January 2004
|
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http://www.apache.org/licenses/
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TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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1. Definitions.
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"License" shall mean the terms and conditions for use, reproduction,
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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.
|
||||
|
|
@ -0,0 +1,129 @@
|
|||
// Copyright 2020 by the contributors.
|
||||
//
|
||||
// Licensed under the Apache License, Version 2.0 (the "License");
|
||||
// you may not use this file except in compliance with the License.
|
||||
// You may obtain a copy of the License at
|
||||
//
|
||||
// http://www.apache.org/licenses/LICENSE-2.0
|
||||
//
|
||||
// Unless required by applicable law or agreed to in writing, software
|
||||
// distributed under the License is distributed on an "AS IS" BASIS,
|
||||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
// See the License for the specific language governing permissions and
|
||||
// limitations under the License.
|
||||
|
||||
package healthcheck
|
||||
|
||||
import (
|
||||
"context"
|
||||
"database/sql"
|
||||
"fmt"
|
||||
"net"
|
||||
"net/http"
|
||||
"runtime"
|
||||
"time"
|
||||
)
|
||||
|
||||
// TCPDialCheck returns a Check that checks TCP connectivity to the provided
|
||||
// endpoint.
|
||||
func TCPDialCheck(addr string, timeout time.Duration) Check {
|
||||
return func() error {
|
||||
conn, err := net.DialTimeout("tcp", addr, timeout)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
return conn.Close()
|
||||
}
|
||||
}
|
||||
|
||||
// HTTPGetCheck returns a Check that performs an HTTP GET request against the
|
||||
// specified URL. The check fails if the response times out or returns a non-200
|
||||
// status code.
|
||||
func HTTPGetCheck(url string, timeout time.Duration) Check {
|
||||
return func() error {
|
||||
return HTTPCheck(url, http.MethodGet, http.StatusOK, timeout)()
|
||||
}
|
||||
}
|
||||
|
||||
// HTTPCheck returns a Check that performs a HTTP request against the specified URL.
|
||||
// The Check fails if the response times out or returns an unexpected status code.
|
||||
func HTTPCheck(url string, method string, status int, timeout time.Duration) Check {
|
||||
client := &http.Client{
|
||||
Timeout: timeout,
|
||||
CheckRedirect: func(*http.Request, []*http.Request) error {
|
||||
return http.ErrUseLastResponse
|
||||
},
|
||||
}
|
||||
|
||||
return HTTPCheckClient(client, url, method, status, timeout)
|
||||
}
|
||||
|
||||
// HTTPCheckClient returns a Check that performs a HTTP request against the specified URL.
|
||||
// The Check fails if the response times out or returns an unexpected status code.
|
||||
// On top of that it uses a custom client specified by the caller.
|
||||
func HTTPCheckClient(client *http.Client, url string, method string, status int, timeout time.Duration) Check {
|
||||
return func() error {
|
||||
ctx, cancel := context.WithTimeout(context.Background(), timeout)
|
||||
defer cancel()
|
||||
|
||||
req, err := http.NewRequest(method, url, nil)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
req = req.WithContext(ctx)
|
||||
|
||||
resp, err := client.Do(req)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
defer resp.Body.Close()
|
||||
|
||||
if resp.StatusCode != status {
|
||||
return fmt.Errorf("returned status %d, expected %d", resp.StatusCode, status)
|
||||
}
|
||||
return nil
|
||||
}
|
||||
}
|
||||
|
||||
// DatabasePingCheck returns a Check that validates connectivity to a
|
||||
// database/sql.DB using Ping().
|
||||
func DatabasePingCheck(database *sql.DB, timeout time.Duration) Check {
|
||||
return func() error {
|
||||
ctx, cancel := context.WithTimeout(context.Background(), timeout)
|
||||
defer cancel()
|
||||
if database == nil {
|
||||
return fmt.Errorf("database is nil")
|
||||
}
|
||||
return database.PingContext(ctx)
|
||||
}
|
||||
}
|
||||
|
||||
// DNSResolveCheck returns a Check that makes sure the provided host can resolve
|
||||
// to at least one IP address within the specified timeout.
|
||||
func DNSResolveCheck(host string, timeout time.Duration) Check {
|
||||
resolver := net.Resolver{}
|
||||
return func() error {
|
||||
ctx, cancel := context.WithTimeout(context.Background(), timeout)
|
||||
defer cancel()
|
||||
addrs, err := resolver.LookupHost(ctx, host)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if len(addrs) < 1 {
|
||||
return fmt.Errorf("could not resolve host")
|
||||
}
|
||||
return nil
|
||||
}
|
||||
}
|
||||
|
||||
// GoroutineCountCheck returns a Check that fails if too many goroutines are
|
||||
// running (which could indicate a resource leak).
|
||||
func GoroutineCountCheck(threshold int) Check {
|
||||
return func() error {
|
||||
count := runtime.NumGoroutine()
|
||||
if count > threshold {
|
||||
return fmt.Errorf("too many goroutines (%d > %d)", count, threshold)
|
||||
}
|
||||
return nil
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,24 @@
|
|||
// Copyright 2020 by the contributors.
|
||||
//
|
||||
// Licensed under the Apache License, Version 2.0 (the "License");
|
||||
// you may not use this file except in compliance with the License.
|
||||
// You may obtain a copy of the License at
|
||||
//
|
||||
// http://www.apache.org/licenses/LICENSE-2.0
|
||||
//
|
||||
// Unless required by applicable law or agreed to in writing, software
|
||||
// distributed under the License is distributed on an "AS IS" BASIS,
|
||||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
// See the License for the specific language governing permissions and
|
||||
// limitations under the License.
|
||||
|
||||
/*
|
||||
Package healthcheck helps you implement liveness and readiness checks
|
||||
for your application. It supports synchronous and asynchronous (background)
|
||||
checks. It can optionally report each check's status as a set of Prometheus
|
||||
gauge metrics for cluster-wide monitoring and alerting.
|
||||
|
||||
It also includes a small library of generic checks for DNS, TCP, and HTTP
|
||||
reachability as well as Goroutine usage.
|
||||
*/
|
||||
package healthcheck
|
||||
|
|
@ -0,0 +1,103 @@
|
|||
// Copyright 2020 by the contributors.
|
||||
//
|
||||
// Licensed under the Apache License, Version 2.0 (the "License");
|
||||
// you may not use this file except in compliance with the License.
|
||||
// You may obtain a copy of the License at
|
||||
//
|
||||
// http://www.apache.org/licenses/LICENSE-2.0
|
||||
//
|
||||
// Unless required by applicable law or agreed to in writing, software
|
||||
// distributed under the License is distributed on an "AS IS" BASIS,
|
||||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
// See the License for the specific language governing permissions and
|
||||
// limitations under the License.
|
||||
|
||||
package healthcheck
|
||||
|
||||
import (
|
||||
"encoding/json"
|
||||
"net/http"
|
||||
"sync"
|
||||
)
|
||||
|
||||
// basicHandler is a basic Handler implementation.
|
||||
type basicHandler struct {
|
||||
http.ServeMux
|
||||
checksMutex sync.RWMutex
|
||||
livenessChecks map[string]Check
|
||||
readinessChecks map[string]Check
|
||||
}
|
||||
|
||||
// NewHandler creates a new basic Handler
|
||||
func NewHandler() Handler {
|
||||
h := &basicHandler{
|
||||
livenessChecks: make(map[string]Check),
|
||||
readinessChecks: make(map[string]Check),
|
||||
}
|
||||
h.Handle("/live", http.HandlerFunc(h.LiveEndpoint))
|
||||
h.Handle("/ready", http.HandlerFunc(h.ReadyEndpoint))
|
||||
return h
|
||||
}
|
||||
|
||||
func (s *basicHandler) LiveEndpoint(w http.ResponseWriter, r *http.Request) {
|
||||
s.handle(w, r, s.livenessChecks)
|
||||
}
|
||||
|
||||
func (s *basicHandler) ReadyEndpoint(w http.ResponseWriter, r *http.Request) {
|
||||
s.handle(w, r, s.readinessChecks, s.livenessChecks)
|
||||
}
|
||||
|
||||
func (s *basicHandler) AddLivenessCheck(name string, check Check) {
|
||||
s.checksMutex.Lock()
|
||||
defer s.checksMutex.Unlock()
|
||||
s.livenessChecks[name] = check
|
||||
}
|
||||
|
||||
func (s *basicHandler) AddReadinessCheck(name string, check Check) {
|
||||
s.checksMutex.Lock()
|
||||
defer s.checksMutex.Unlock()
|
||||
s.readinessChecks[name] = check
|
||||
}
|
||||
|
||||
func (s *basicHandler) collectChecks(checks map[string]Check, resultsOut map[string]string, statusOut *int) {
|
||||
s.checksMutex.RLock()
|
||||
defer s.checksMutex.RUnlock()
|
||||
for name, check := range checks {
|
||||
if err := check(); err != nil {
|
||||
*statusOut = http.StatusServiceUnavailable
|
||||
resultsOut[name] = err.Error()
|
||||
} else {
|
||||
resultsOut[name] = "OK"
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func (s *basicHandler) handle(w http.ResponseWriter, r *http.Request, checks ...map[string]Check) {
|
||||
if r.Method != http.MethodGet {
|
||||
http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
|
||||
return
|
||||
}
|
||||
|
||||
checkResults := make(map[string]string)
|
||||
status := http.StatusOK
|
||||
for _, checks := range checks {
|
||||
s.collectChecks(checks, checkResults, &status)
|
||||
}
|
||||
|
||||
// write out the response code and content type header
|
||||
w.Header().Set("Content-Type", "application/json; charset=utf-8")
|
||||
w.WriteHeader(status)
|
||||
|
||||
// if ?hide=1, return an empty body. Kubernetes only cares about the
|
||||
// HTTP status code, so we won't waste bytes on the full body.
|
||||
if r.URL.Query().Get("hide") == "1" {
|
||||
_, _ = w.Write([]byte("{}\n"))
|
||||
return
|
||||
}
|
||||
|
||||
// otherwise, write the JSON body ignoring any encoding errors (which
|
||||
// shouldn't really be possible since we're encoding a map[string]string).
|
||||
encoder := json.NewEncoder(w)
|
||||
encoder.SetIndent("", " ")
|
||||
_ = encoder.Encode(checkResults)
|
||||
}
|
||||
72
vendor/github.com/metalmatze/signal/healthcheck/metrics_handler.go
generated
vendored
Normal file
72
vendor/github.com/metalmatze/signal/healthcheck/metrics_handler.go
generated
vendored
Normal file
|
|
@ -0,0 +1,72 @@
|
|||
// Copyright 2020 by the contributors.
|
||||
//
|
||||
// Licensed under the Apache License, Version 2.0 (the "License");
|
||||
// you may not use this file except in compliance with the License.
|
||||
// You may obtain a copy of the License at
|
||||
//
|
||||
// http://www.apache.org/licenses/LICENSE-2.0
|
||||
//
|
||||
// Unless required by applicable law or agreed to in writing, software
|
||||
// distributed under the License is distributed on an "AS IS" BASIS,
|
||||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
// See the License for the specific language governing permissions and
|
||||
// limitations under the License.
|
||||
|
||||
package healthcheck
|
||||
|
||||
import (
|
||||
"net/http"
|
||||
|
||||
"github.com/prometheus/client_golang/prometheus"
|
||||
)
|
||||
|
||||
type metricsHandler struct {
|
||||
handler Handler
|
||||
registry prometheus.Registerer
|
||||
}
|
||||
|
||||
// NewMetricsHandler returns a healthy Handler that writes the current check status
|
||||
// into the provided Prometheus registry.
|
||||
func NewMetricsHandler(handler Handler, registry prometheus.Registerer) Handler {
|
||||
return &metricsHandler{
|
||||
handler: handler,
|
||||
registry: registry,
|
||||
}
|
||||
}
|
||||
|
||||
func (h *metricsHandler) AddLivenessCheck(name string, check Check) {
|
||||
h.handler.AddLivenessCheck(name, h.wrap(prometheus.Labels{"name": name, "check": "live"}, check))
|
||||
}
|
||||
|
||||
func (h *metricsHandler) AddReadinessCheck(name string, check Check) {
|
||||
h.handler.AddReadinessCheck(name, h.wrap(prometheus.Labels{"name": name, "check": "ready"}, check))
|
||||
}
|
||||
|
||||
func (h *metricsHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
||||
h.handler.ServeHTTP(w, r)
|
||||
}
|
||||
|
||||
func (h *metricsHandler) LiveEndpoint(w http.ResponseWriter, r *http.Request) {
|
||||
h.handler.LiveEndpoint(w, r)
|
||||
}
|
||||
|
||||
func (h *metricsHandler) ReadyEndpoint(w http.ResponseWriter, r *http.Request) {
|
||||
h.handler.ReadyEndpoint(w, r)
|
||||
}
|
||||
|
||||
func (h *metricsHandler) wrap(labels prometheus.Labels, check Check) Check {
|
||||
h.registry.MustRegister(prometheus.NewGaugeFunc(
|
||||
prometheus.GaugeOpts{
|
||||
Name: "healthcheck",
|
||||
Help: "Indicates if check is healthy (1 is healthy, 0 is unhealthy)",
|
||||
ConstLabels: labels,
|
||||
},
|
||||
func() float64 {
|
||||
if check() != nil {
|
||||
return 0
|
||||
}
|
||||
return 1
|
||||
},
|
||||
))
|
||||
return check
|
||||
}
|
||||
|
|
@ -0,0 +1,52 @@
|
|||
// Copyright 2020 by the contributors.
|
||||
//
|
||||
// Licensed under the Apache License, Version 2.0 (the "License");
|
||||
// you may not use this file except in compliance with the License.
|
||||
// You may obtain a copy of the License at
|
||||
//
|
||||
// http://www.apache.org/licenses/LICENSE-2.0
|
||||
//
|
||||
// Unless required by applicable law or agreed to in writing, software
|
||||
// distributed under the License is distributed on an "AS IS" BASIS,
|
||||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
// See the License for the specific language governing permissions and
|
||||
// limitations under the License.
|
||||
|
||||
package healthcheck
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"time"
|
||||
)
|
||||
|
||||
// TimeoutError is the error returned when a Timeout-wrapped Check takes too long
|
||||
type timeoutError time.Duration
|
||||
|
||||
func (e timeoutError) Error() string {
|
||||
return fmt.Sprintf("timed out after %s", time.Duration(e).String())
|
||||
}
|
||||
|
||||
// Timeout returns whether this error is a timeout (always true for timeoutError)
|
||||
func (e timeoutError) Timeout() bool {
|
||||
return true
|
||||
}
|
||||
|
||||
// Temporary returns whether this error is temporary (always true for timeoutError)
|
||||
func (e timeoutError) Temporary() bool {
|
||||
return true
|
||||
}
|
||||
|
||||
// Timeout adds a timeout to a Check. If the underlying check takes longer than
|
||||
// the timeout, it returns an error.
|
||||
func Timeout(check Check, timeout time.Duration) Check {
|
||||
return func() error {
|
||||
c := make(chan error, 1)
|
||||
go func() { c <- check() }()
|
||||
select {
|
||||
case err := <-c:
|
||||
return err
|
||||
case <-time.After(timeout):
|
||||
return timeoutError(timeout)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,52 @@
|
|||
// Copyright 2020 by the contributors.
|
||||
//
|
||||
// Licensed under the Apache License, Version 2.0 (the "License");
|
||||
// you may not use this file except in compliance with the License.
|
||||
// You may obtain a copy of the License at
|
||||
//
|
||||
// http://www.apache.org/licenses/LICENSE-2.0
|
||||
//
|
||||
// Unless required by applicable law or agreed to in writing, software
|
||||
// distributed under the License is distributed on an "AS IS" BASIS,
|
||||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
// See the License for the specific language governing permissions and
|
||||
// limitations under the License.
|
||||
|
||||
package healthcheck
|
||||
|
||||
import (
|
||||
"net/http"
|
||||
)
|
||||
|
||||
// Check is a health/readiness check.
|
||||
type Check func() error
|
||||
|
||||
// Handler is an http.Handler with additional methods that register health and
|
||||
// readiness checks. It handles handle "/live" and "/ready" HTTP
|
||||
// endpoints.
|
||||
type Handler interface {
|
||||
// The Handler is an http.Handler, so it can be exposed directly and handle
|
||||
// /live and /ready endpoints.
|
||||
http.Handler
|
||||
|
||||
// AddLivenessCheck adds a check that indicates that this instance of the
|
||||
// application should be destroyed or restarted. A failed liveness check
|
||||
// indicates that this instance is unhealthy, not some upstream dependency.
|
||||
// Every liveness check is also included as a readiness check.
|
||||
AddLivenessCheck(name string, check Check)
|
||||
|
||||
// AddReadinessCheck adds a check that indicates that this instance of the
|
||||
// application is currently unable to serve requests because of an upstream
|
||||
// or some transient failure. If a readiness check fails, this instance
|
||||
// should no longer receiver requests, but should not be restarted or
|
||||
// destroyed.
|
||||
AddReadinessCheck(name string, check Check)
|
||||
|
||||
// LiveEndpoint is the HTTP handler for just the /live endpoint, which is
|
||||
// useful if you need to attach it into your own HTTP handler tree.
|
||||
LiveEndpoint(http.ResponseWriter, *http.Request)
|
||||
|
||||
// ReadyEndpoint is the HTTP handler for just the /ready endpoint, which is
|
||||
// useful if you need to attach it into your own HTTP handler tree.
|
||||
ReadyEndpoint(http.ResponseWriter, *http.Request)
|
||||
}
|
||||
|
|
@ -0,0 +1,138 @@
|
|||
// Copyright 2021 by the contributors.
|
||||
//
|
||||
// Licensed under the Apache License, Version 2.0 (the "License");
|
||||
// you may not use this file except in compliance with the License.
|
||||
// You may obtain a copy of the License at
|
||||
//
|
||||
// http://www.apache.org/licenses/LICENSE-2.0
|
||||
//
|
||||
// Unless required by applicable law or agreed to in writing, software
|
||||
// distributed under the License is distributed on an "AS IS" BASIS,
|
||||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
// See the License for the specific language governing permissions and
|
||||
// limitations under the License.
|
||||
|
||||
package internalserver
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"net/http"
|
||||
"net/http/pprof"
|
||||
"sort"
|
||||
|
||||
"github.com/metalmatze/signal/healthcheck"
|
||||
"github.com/prometheus/client_golang/prometheus"
|
||||
"github.com/prometheus/client_golang/prometheus/promhttp"
|
||||
)
|
||||
|
||||
// Handler is a http.ServeMux that knows about all endpoints to render a nice index page.
|
||||
type Handler struct {
|
||||
http.ServeMux
|
||||
endpoints []endpoint
|
||||
name string
|
||||
}
|
||||
|
||||
// endpoint has a description to a pattern.
|
||||
type endpoint struct {
|
||||
Pattern string
|
||||
Description string
|
||||
}
|
||||
|
||||
// NewHandler creates a new internalserver Handler.
|
||||
func NewHandler(options ...Option) *Handler {
|
||||
h := &Handler{name: "Internal"}
|
||||
|
||||
for _, option := range options {
|
||||
option(h)
|
||||
}
|
||||
|
||||
h.HandleFunc("/", h.index)
|
||||
|
||||
return h
|
||||
}
|
||||
|
||||
// AddEndpoint wraps HandleFunc for adding http handlers to add a meaningful description to the index page.
|
||||
func (h *Handler) AddEndpoint(pattern string, description string, handler http.HandlerFunc) {
|
||||
h.endpoints = append(h.endpoints, endpoint{
|
||||
Pattern: pattern,
|
||||
Description: description,
|
||||
})
|
||||
|
||||
// Sort endpoints by pattern after adding a new one, to always show them in the same order.
|
||||
sort.Slice(h.endpoints, func(i, j int) bool {
|
||||
return h.endpoints[i].Pattern < h.endpoints[j].Pattern
|
||||
})
|
||||
|
||||
h.HandleFunc(pattern, handler)
|
||||
}
|
||||
|
||||
func (h *Handler) index(w http.ResponseWriter, r *http.Request) {
|
||||
html := fmt.Sprintf("<html><head><title>%s</title></head><body>\n", h.name)
|
||||
html += fmt.Sprintf("<h1>%s</h1>\n", h.name)
|
||||
|
||||
for _, e := range h.endpoints {
|
||||
html += fmt.Sprintf("<p><a href='%s'>%s - %s</a></p>\n", e.Pattern, e.Pattern, e.Description)
|
||||
}
|
||||
html += `</body></html>`
|
||||
|
||||
w.Header().Set("Content-Type", "text/html; charset=utf-8")
|
||||
_, _ = w.Write([]byte(html))
|
||||
}
|
||||
|
||||
// Option is a func that modifies the configuration for the internalserver handler.
|
||||
type Option func(h *Handler)
|
||||
|
||||
// WithName allows to set an application name for the internalserver handler.
|
||||
func WithName(name string) Option {
|
||||
return func(h *Handler) {
|
||||
h.name = name
|
||||
}
|
||||
}
|
||||
|
||||
// WithHealthchecks adds the healthchecks endpoints /live and /ready to the internalserver.
|
||||
func WithHealthchecks(healthchecks healthcheck.Handler) Option {
|
||||
return func(h *Handler) {
|
||||
h.AddEndpoint(
|
||||
"/live",
|
||||
"Exposes liveness checks",
|
||||
healthchecks.LiveEndpoint,
|
||||
)
|
||||
h.AddEndpoint(
|
||||
"/ready",
|
||||
"Exposes readiness checks",
|
||||
healthchecks.ReadyEndpoint,
|
||||
)
|
||||
}
|
||||
}
|
||||
|
||||
// WithPrometheusRegistry adds a /metrics endpoint to the internalserver.
|
||||
func WithPrometheusRegistry(registry *prometheus.Registry) Option {
|
||||
return func(h *Handler) {
|
||||
h.AddEndpoint(
|
||||
"/metrics",
|
||||
"Exposes Prometheus metrics",
|
||||
promhttp.HandlerFor(registry, promhttp.HandlerOpts{}).ServeHTTP,
|
||||
)
|
||||
}
|
||||
}
|
||||
|
||||
// WithPProf adds all pprof endpoints under /debug to the internalserver.
|
||||
func WithPProf() Option {
|
||||
return func(h *Handler) {
|
||||
m := http.NewServeMux()
|
||||
m.HandleFunc("/debug/pprof/", pprof.Index)
|
||||
m.HandleFunc("/debug/pprof/cmdline", pprof.Cmdline)
|
||||
m.HandleFunc("/debug/pprof/profile", pprof.Profile)
|
||||
m.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
|
||||
m.HandleFunc("/debug/pprof/trace", pprof.Trace)
|
||||
m.HandleFunc("/debug/", func(w http.ResponseWriter, r *http.Request) {
|
||||
http.Redirect(w, r, "/debug/pprof/", http.StatusMovedPermanently)
|
||||
})
|
||||
|
||||
h.AddEndpoint(
|
||||
"/debug/",
|
||||
"Exposes pprof endpoints to consume via HTTP",
|
||||
m.ServeHTTP,
|
||||
)
|
||||
}
|
||||
}
|
||||
|
|
@ -127,6 +127,10 @@ github.com/mdlayher/netlink/nlenc
|
|||
# github.com/mdlayher/socket v0.0.0-20211102153432-57e3fa563ecb
|
||||
## explicit; go 1.17
|
||||
github.com/mdlayher/socket
|
||||
# github.com/metalmatze/signal v0.0.0-20210307161603-1c9aa721a97a
|
||||
## explicit; go 1.14
|
||||
github.com/metalmatze/signal/healthcheck
|
||||
github.com/metalmatze/signal/internalserver
|
||||
# github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd
|
||||
## explicit
|
||||
github.com/modern-go/concurrent
|
||||
|
|
|
|||
Loading…
Reference in New Issue