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configure_goldpinger.go
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/
configure_goldpinger.go
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// Copyright 2018 Bloomberg Finance L.P.
//
// 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.
// This file is safe to edit. Once it exists it will not be overwritten
package restapi
import (
"context"
"crypto/tls"
"net/http"
"strings"
"github.com/go-openapi/errors"
"github.com/go-openapi/runtime"
"github.com/go-openapi/runtime/middleware"
"go.uber.org/zap"
"github.com/bloomberg/goldpinger/v3/pkg/goldpinger"
"github.com/bloomberg/goldpinger/v3/pkg/restapi/operations"
"github.com/go-openapi/swag"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
//go:generate swagger generate server --target ../goldpinger --name Goldpinger --spec ../swagger.yml --exclude-main
func configureFlags(api *operations.GoldpingerAPI) {
api.CommandLineOptionsGroups = []swag.CommandLineOptionsGroup{
swag.CommandLineOptionsGroup{
ShortDescription: "Goldpinger Config",
LongDescription: "",
Options: &goldpinger.GoldpingerConfig,
},
}
}
func configureAPI(api *operations.GoldpingerAPI) http.Handler {
// configure the api here
api.Logger = zap.S().Infof
api.ServeError = errors.ServeError
api.JSONConsumer = runtime.JSONConsumer()
api.JSONProducer = runtime.JSONProducer()
api.PingHandler = operations.PingHandlerFunc(
func(params operations.PingParams) middleware.Responder {
goldpinger.CountCall("received", "ping")
ctx, cancel := context.WithTimeout(
params.HTTPRequest.Context(),
goldpinger.GoldpingerConfig.PingTimeout,
)
defer cancel()
return operations.NewPingOK().WithPayload(goldpinger.GetStats(ctx))
})
api.CheckServicePodsHandler = operations.CheckServicePodsHandlerFunc(
func(params operations.CheckServicePodsParams) middleware.Responder {
goldpinger.CountCall("received", "check")
ctx, cancel := context.WithTimeout(
params.HTTPRequest.Context(),
goldpinger.GoldpingerConfig.CheckTimeout,
)
defer cancel()
return operations.NewCheckServicePodsOK().WithPayload(goldpinger.CheckNeighbours(ctx))
})
api.CheckAllPodsHandler = operations.CheckAllPodsHandlerFunc(
func(params operations.CheckAllPodsParams) middleware.Responder {
goldpinger.CountCall("received", "check_all")
ctx, cancel := context.WithTimeout(
params.HTTPRequest.Context(),
goldpinger.GoldpingerConfig.CheckAllTimeout,
)
defer cancel()
return operations.NewCheckAllPodsOK().WithPayload(goldpinger.CheckNeighboursNeighbours(ctx))
})
api.ClusterHealthHandler = operations.ClusterHealthHandlerFunc(
func(params operations.ClusterHealthParams) middleware.Responder {
goldpinger.CountCall("received", "cluster_health")
ctx, cancel := context.WithTimeout(
params.HTTPRequest.Context(),
goldpinger.GoldpingerConfig.CheckAllTimeout,
)
defer cancel()
payload := goldpinger.CheckCluster(ctx)
if payload.OK {
return operations.NewClusterHealthOK().WithPayload(payload)
} else {
return operations.NewClusterHealthIMATeapot().WithPayload(payload)
}
})
api.HealthzHandler = operations.HealthzHandlerFunc(
func(params operations.HealthzParams) middleware.Responder {
goldpinger.CountCall("received", "healthz")
healthResult := goldpinger.HealthCheck()
if *healthResult.OK {
return operations.NewHealthzOK().WithPayload(healthResult)
} else {
return operations.NewHealthzServiceUnavailable().WithPayload(healthResult)
}
})
api.ServerShutdown = func() {}
return setupGlobalMiddleware(api.Serve(setupMiddlewares))
}
// The TLS configuration before HTTPS server starts.
func configureTLS(tlsConfig *tls.Config) {
// Make all necessary changes to the TLS configuration here.
}
// As soon as server is initialized but not run yet, this function will be called.
// If you need to modify a config, store server instance to stop it individually later, this is the place.
// This function can be called multiple times, depending on the number of serving schemes.
// scheme value will be set accordingly: "http", "https" or "unix"
func configureServer(s *http.Server, scheme, addr string) {
}
// The middleware configuration is for the handler executors. These do not apply to the swagger.json document.
// The middleware executes after routing but before authentication, binding and validation
func setupMiddlewares(handler http.Handler) http.Handler {
return handler
}
func fileServerMiddleware(next http.Handler) http.Handler {
zap.L().Info("Added the static middleware")
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
fileServer := http.FileServer(http.Dir(goldpinger.GoldpingerConfig.StaticFilePath))
if r.URL.Path == "/" {
http.StripPrefix("/", fileServer).ServeHTTP(w, r)
} else if r.URL.Path == "/heatmap.png" {
goldpinger.HeatmapHandler(w, r)
} else if strings.HasPrefix(r.URL.Path, "/static/") {
http.StripPrefix("/static/", fileServer).ServeHTTP(w, r)
} else {
next.ServeHTTP(w, r)
}
})
}
func prometheusMetricsMiddleware(next http.Handler) http.Handler {
zap.L().Info("Added the prometheus middleware")
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path == "/metrics" {
http.StripPrefix("/metrics", promhttp.Handler()).ServeHTTP(w, r)
} else {
next.ServeHTTP(w, r)
}
})
}
// 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 {
return prometheusMetricsMiddleware(fileServerMiddleware(handler))
}