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Merge pull request #385 from openziti/v0.4_healthcheck

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New Health Check Endpoint (#372)
This commit is contained in:
Michael Quigley 2023-08-08 15:41:18 -04:00 committed by GitHub
commit 5861a037be
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6 changed files with 89 additions and 9 deletions
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4
CHANGELOG.md
View File

@ -1,3 +1,7 @@
# v0.4.5
FEATURE: New health check endpoint (`/health`), which verifies that the underlying SQL store and metrics repository (InfluxDB, if configured) are operating correctly (https://github.com/openziti/zrok/issues/372)
# v0.4.4
FIX: `zrok status`, `zrok enable`, `zrok config`, etc. were all causing a panic when used on systems that had no previous `~/.zrok` directory (https://github.com/openziti/zrok/issues/383)

5
controller/controller.go
View File

@ -128,6 +128,7 @@ func Run(inCfg *config.Config) error {
defer func() { _ = server.Shutdown() }()
server.Host = cfg.Endpoint.Host
server.Port = cfg.Endpoint.Port
rest_server_zrok.HealthCheck = HealthCheckHTTP
server.ConfigureAPI()
if err := server.Serve(); err != nil {
return errors.Wrap(err, "api server error")
@ -135,3 +136,7 @@ func Run(inCfg *config.Config) error {
return nil
}
func Store() *store.Store {
return str
}

62
controller/health.go Normal file
View File

@ -0,0 +1,62 @@
package controller
import (
"context"
"fmt"
"github.com/sirupsen/logrus"
"net/http"
)
func HealthCheckHTTP(w http.ResponseWriter, _ *http.Request) {
if err := healthCheckStore(w); err != nil {
logrus.Error(err)
return
}
if err := healthCheckMetrics(w); err != nil {
logrus.Error(err)
return
}
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.Write([]byte("<html><body><h1>Healthy</h1></body></html>"))
}
func healthCheckStore(w http.ResponseWriter) error {
trx, err := str.Begin()
if err != nil {
http.Error(w, "error starting transaction", http.StatusInternalServerError)
return err
}
defer func() {
_ = trx.Rollback()
}()
count := -1
if err := trx.QueryRowx("select count(0) from migrations").Scan(&count); err != nil {
http.Error(w, "error selecting migration count", http.StatusInternalServerError)
return err
}
logrus.Debugf("%d migrations", count)
return nil
}
func healthCheckMetrics(w http.ResponseWriter) error {
if cfg.Metrics != nil && cfg.Metrics.Influx != nil {
queryApi := idb.QueryAPI(cfg.Metrics.Influx.Org)
query := fmt.Sprintf("from(bucket: \"%v\")\n", cfg.Metrics.Influx.Bucket) +
fmt.Sprintf("|> range(start: -5s)\n") +
"|> filter(fn: (r) => r[\"_measurement\"] == \"xfer\")\n" +
"|> filter(fn: (r) => r[\"_field\"] == \"rx\" or r[\"_field\"] == \"tx\")\n" +
"|> filter(fn: (r) => r[\"namespace\"] == \"backend\")\n" +
"|> sum()"
result, err := queryApi.Query(context.Background(), query)
if err != nil {
http.Error(w, "error querying influx", http.StatusInternalServerError)
return err
}
results := 0
for result.Next() {
results++
}
logrus.Debugf("%d results", results)
}
return nil
}

5
rest_server_zrok/configure_zrok.go
View File

@ -13,6 +13,8 @@ import (
"github.com/openziti/zrok/rest_server_zrok/operations"
)
var HealthCheck func(w http.ResponseWriter, r *http.Request)
//go:generate swagger generate server --target ../../zrok --name Zrok --spec ../specs/zrok.yml --model-package rest_model_zrok --server-package rest_server_zrok --principal interface{} --exclude-main
func configureFlags(api *operations.ZrokAPI) {
@ -53,6 +55,5 @@ func setupMiddlewares(handler http.Handler) http.Handler {
// The middleware configuration happens before anything, this middleware also applies to serving the swagger.json document.
// So this is a good place to plug in a panic handling middleware, logging and metrics.
func setupGlobalMiddleware(handler http.Handler) http.Handler {
logrus.Infof("configuring")
return ui.StaticBuilder(handler)
return ui.Middleware(handler, HealthCheck)
}

6
ui/static.go → ui/middleware.go
View File

@ -9,7 +9,7 @@ import (
"strings"
)
func StaticBuilder(handler http.Handler) http.Handler {
func Middleware(handler http.Handler, healthCheck func(w http.ResponseWriter, r *http.Request)) http.Handler {
logrus.Infof("building")
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if strings.HasPrefix(r.URL.Path, "/api/v1") {
@ -17,6 +17,10 @@ func StaticBuilder(handler http.Handler) http.Handler {
handler.ServeHTTP(w, r)
return
}
if strings.HasPrefix(r.URL.Path, "/health") {
healthCheck(w, r)
return
}
logrus.Debugf("directing '%v' to static handler", r.URL.Path)

16
ui/package-lock.json generated
View File

@ -6196,9 +6196,9 @@
}
},
"node_modules/caniuse-lite": {
"version": "1.0.30001450",
"resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001450.tgz",
"integrity": "sha512-qMBmvmQmFXaSxexkjjfMvD5rnDL0+m+dUMZKoDYsGG8iZN29RuYh9eRoMvKsT6uMAWlyUUGDEQGJJYjzCIO9ew==",
"version": "1.0.30001519",
"resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001519.tgz",
"integrity": "sha512-0QHgqR+Jv4bxHMp8kZ1Kn8CH55OikjKJ6JmKkZYP1F3D7w+lnFXF70nG5eNfsZS89jadi5Ywy5UCSKLAglIRkg==",
"funding": [
{
"type": "opencollective",
@ -6207,6 +6207,10 @@
{
"type": "tidelift",
"url": "https://tidelift.com/funding/github/npm/caniuse-lite"
},
{
"type": "github",
"url": "https://github.com/sponsors/ai"
}
]
},
@ -24270,9 +24274,9 @@
}
},
"caniuse-lite": {
"version": "1.0.30001450",
"resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001450.tgz",
"integrity": "sha512-qMBmvmQmFXaSxexkjjfMvD5rnDL0+m+dUMZKoDYsGG8iZN29RuYh9eRoMvKsT6uMAWlyUUGDEQGJJYjzCIO9ew=="
"version": "1.0.30001519",
"resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001519.tgz",
"integrity": "sha512-0QHgqR+Jv4bxHMp8kZ1Kn8CH55OikjKJ6JmKkZYP1F3D7w+lnFXF70nG5eNfsZS89jadi5Ywy5UCSKLAglIRkg=="
},
"canvas-color-tracker": {
"version": "1.1.6",