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main.go
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main.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.
package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"log"
"os"
"strings"
"time"
"github.com/go-openapi/loads"
"go.uber.org/zap"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/utils/net"
"github.com/bloomberg/goldpinger/v3/pkg/goldpinger"
"github.com/bloomberg/goldpinger/v3/pkg/restapi"
"github.com/bloomberg/goldpinger/v3/pkg/restapi/operations"
flags "github.com/jessevdk/go-flags"
)
// these will be injected during build in build.sh script to allow printing
var (
Version, Build string
)
func getLogger(zapconfigpath string) (*zap.Logger, error) {
var logger *zap.Logger
var err error
zapconfigJSON, err := ioutil.ReadFile(zapconfigpath)
if err != nil {
return nil, fmt.Errorf("Could not read zap config file: %w", err)
}
var cfg zap.Config
if err := json.Unmarshal(zapconfigJSON, &cfg); err != nil {
return nil, fmt.Errorf("Could not read zap config as json: %w", err)
}
logger, err = cfg.Build()
if err != nil {
return nil, fmt.Errorf("Could not build zap config: %w", err)
}
return logger, nil
}
func main() {
// load embedded swagger file
swaggerSpec, err := loads.Analyzed(restapi.SwaggerJSON, "")
if err != nil {
log.Fatalf("Could not parse swagger: %v", err)
}
// create new service API
api := operations.NewGoldpingerAPI(swaggerSpec)
server := restapi.NewServer(api)
defer server.Shutdown()
parser := flags.NewParser(server, flags.Default)
parser.ShortDescription = "Goldpinger"
parser.LongDescription = swaggerSpec.Spec().Info.Description
// parse flags
server.ConfigureFlags()
for _, optsGroup := range api.CommandLineOptionsGroups {
_, err := parser.AddGroup(optsGroup.ShortDescription, optsGroup.LongDescription, optsGroup.Options)
if err != nil {
log.Fatalf("Could not add flag group: %v", err)
}
}
if _, err := parser.Parse(); err != nil {
code := 1
if fe, ok := err.(*flags.Error); ok {
if fe.Type == flags.ErrHelp {
code = 0
}
}
os.Exit(code)
}
// Configure logger
logger, err := getLogger(goldpinger.GoldpingerConfig.ZapConfigPath)
if err != nil {
var errDev error
logger, errDev = zap.NewDevelopment()
if errDev != nil {
log.Fatalf("Could not build a development logger: %v", errDev)
}
logger.Warn("Logger could not be built, defaulting to development settings", zap.String("error", fmt.Sprintf("%v", err)))
}
defer logger.Sync()
undo := zap.RedirectStdLog(logger)
defer undo()
logger.Info("Goldpinger", zap.String("version", Version), zap.String("build", Build))
if goldpinger.GoldpingerConfig.Namespace == nil {
goldpinger.GoldpingerConfig.Namespace = &goldpinger.PodNamespace
} else {
logger.Info("Using configured namespace", zap.String("namespace", *goldpinger.GoldpingerConfig.Namespace))
}
// make a kubernetes client
var config *rest.Config
if goldpinger.GoldpingerConfig.KubeConfigPath == "" {
logger.Info("Kubeconfig not specified, trying to use in cluster config")
config, err = rest.InClusterConfig()
} else {
logger.Info("Kubeconfig specified", zap.String("path", goldpinger.GoldpingerConfig.KubeConfigPath))
config, err = clientcmd.BuildConfigFromFlags("", goldpinger.GoldpingerConfig.KubeConfigPath)
}
if err != nil {
logger.Fatal("Error getting config ", zap.Error(err))
}
// communicate to kube-apiserver with protobuf
config.AcceptContentTypes = strings.Join([]string{runtime.ContentTypeProtobuf, runtime.ContentTypeJSON}, ",")
config.ContentType = runtime.ContentTypeProtobuf
// create the clientset
clientset, err := kubernetes.NewForConfig(config)
if err != nil {
logger.Fatal("kubernetes.NewForConfig error ", zap.Error(err))
}
goldpinger.GoldpingerConfig.KubernetesClient = clientset
// Check if we have an override for the client, default to own port
if goldpinger.GoldpingerConfig.Port == 0 {
goldpinger.GoldpingerConfig.Port = server.Port
}
if goldpinger.GoldpingerConfig.PodIP == "" {
logger.Info("PodIP not set: pinging all pods")
}
if goldpinger.GoldpingerConfig.PingNumber == 0 {
logger.Info("--ping-number set to 0: pinging all pods")
}
if goldpinger.GoldpingerConfig.IPVersions == nil || len(goldpinger.GoldpingerConfig.IPVersions) == 0 {
logger.Info("IPVersions not set: settings to 4 (IPv4)")
goldpinger.GoldpingerConfig.IPVersions = []string{"4"}
}
if len(goldpinger.GoldpingerConfig.IPVersions) > 1 {
logger.Warn("Multiple IP versions not supported. Will use first version specified as default", zap.Strings("IPVersions", goldpinger.GoldpingerConfig.IPVersions))
}
if goldpinger.GoldpingerConfig.IPVersions[0] != string(net.IPv4) && goldpinger.GoldpingerConfig.IPVersions[0] != string(net.IPv6) {
logger.Error("Unknown IP version specified: expected values are 4 or 6", zap.Strings("IPVersions", goldpinger.GoldpingerConfig.IPVersions))
}
// Handle deprecated flags
if int(goldpinger.GoldpingerConfig.PingTimeout) == 0 {
logger.Warn("ping-timeout-ms is deprecated in favor of ping-timeout and will be removed in the future",
zap.Int64("ping-timeout-ms", goldpinger.GoldpingerConfig.PingTimeoutMs))
goldpinger.GoldpingerConfig.PingTimeout = time.Duration(goldpinger.GoldpingerConfig.PingTimeoutMs) * time.Millisecond
}
if int(goldpinger.GoldpingerConfig.CheckTimeout) == 0 {
logger.Warn("check-timeout-ms is deprecated in favor of check-timeout and will be removed in the future",
zap.Int64("check-timeout-ms", goldpinger.GoldpingerConfig.CheckTimeoutMs))
goldpinger.GoldpingerConfig.CheckTimeout = time.Duration(goldpinger.GoldpingerConfig.CheckTimeoutMs) * time.Millisecond
}
if int(goldpinger.GoldpingerConfig.CheckAllTimeout) == 0 {
logger.Warn("check-all-timeout-ms is deprecated in favor of check-all-timeout will be removed in the future",
zap.Int64("check-all-timeout-ms", goldpinger.GoldpingerConfig.CheckAllTimeoutMs))
goldpinger.GoldpingerConfig.CheckAllTimeout = time.Duration(goldpinger.GoldpingerConfig.CheckAllTimeoutMs) * time.Millisecond
}
server.ConfigureAPI()
goldpinger.StartUpdater()
logger.Info("All good, starting serving the API")
// serve API
if err := server.Serve(); err != nil {
logger.Fatal("Error serving the API", zap.Error(err))
}
}