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server.go
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server.go
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package main
import (
"flag"
"fmt"
"net"
"net/http"
"os"
"strconv"
rtctx "github.com/paralin/rethinkts/context"
gw "github.com/paralin/rethinkts/metric"
gwimpl "github.com/paralin/rethinkts/metric/impl"
"github.com/golang/glog"
"github.com/grpc-ecosystem/grpc-gateway/runtime"
"golang.org/x/net/context"
"google.golang.org/grpc"
"gopkg.in/asaskevich/govalidator.v4"
r "gopkg.in/dancannon/gorethink.v2"
)
var RuntimeArgs struct {
GrpcPort int
HttpPort int
RethinkIp string
MetricDB string
MetricSeriesTable string
MetricTablePrefix string
}
func bindFlags() {
flag.IntVar(&RuntimeArgs.GrpcPort, "grpcport", 5000, "GRPC port to bind")
flag.IntVar(&RuntimeArgs.HttpPort, "httpport", 8085, "HTTP port to bind")
flag.StringVar(&RuntimeArgs.RethinkIp, "rethinkip", "", "rethink ip, for example rethinkdb.rethinkdb.svc.cluster.local")
flag.StringVar(&RuntimeArgs.MetricDB, "d", "", "metric DB")
flag.StringVar(&RuntimeArgs.MetricSeriesTable, "table", "metrics", "metric series table")
flag.StringVar(&RuntimeArgs.MetricTablePrefix, "tableprefix", "metric_", "metric table prefix")
flag.CommandLine.Usage = func() {
fmt.Println(`rethinkts
Starts the API at the ports specified.
Flags:`)
flag.CommandLine.PrintDefaults()
}
flag.Parse()
}
func bindEnv() {
if ev := os.Getenv("GRPC_PORT"); ev != "" {
port, err := strconv.Atoi(ev)
if err != nil {
fmt.Printf("Couldn't parse env GRPC_PORT (%s), error %v\n", ev, err)
} else {
RuntimeArgs.GrpcPort = port
}
}
if ev := os.Getenv("PORT"); ev != "" {
port, err := strconv.Atoi(ev)
if err != nil {
fmt.Printf("Couldn't parse env PORT (%s), error %v\n", ev, err)
} else {
RuntimeArgs.HttpPort = port
}
}
}
func verifyPort(port int) error {
if port < 50 || port > 65535 {
return fmt.Errorf("Port number %d invalid.", port)
}
return nil
}
func verifyArgs() error {
if err := verifyPort(RuntimeArgs.GrpcPort); err != nil {
return fmt.Errorf("GRPC port invalid: %v", err)
}
if err := verifyPort(RuntimeArgs.HttpPort); err != nil {
return fmt.Errorf("HTTP port invalid: %v", err)
}
if RuntimeArgs.RethinkIp == "" {
return fmt.Errorf("Empty rethink IP is invalid.")
}
if RuntimeArgs.MetricDB == "" {
return fmt.Errorf("Empty metric DB is invalid.")
}
return nil
}
func setupRethink() (*r.Session, error) {
return r.Connect(r.ConnectOpts{
Address: RuntimeArgs.RethinkIp,
})
}
func runHttpService(endpoint, grpcEndpoint string, ctx context.Context) error {
mux := runtime.NewServeMux()
opts := []grpc.DialOption{grpc.WithInsecure()}
err := gw.RegisterMetricServiceHandlerFromEndpoint(ctx, mux, grpcEndpoint, opts)
if err != nil {
return err
}
glog.Infof("GRPC-Proxy listening on %s", endpoint)
http.ListenAndServe(endpoint, mux)
return nil
}
func main() {
// Log to stdout
flag.Lookup("logtostderr").Value.Set("true")
defer func() {
glog.Info("Exiting...")
}()
defer glog.Flush()
govalidator.SetFieldsRequiredByDefault(true)
r.SetTags("gorethink", "json")
bindFlags()
bindEnv()
if err := verifyArgs(); err != nil {
glog.Fatalf("Error with args: %v\n", err)
}
rctx, err := setupRethink()
if err != nil {
glog.Fatalf("Error setting up rethink %v\n", err)
}
defer rctx.Close()
glog.Info("Connected to Rethink, building context...")
mctx, err := rtctx.BuildBaseContext(rctx, RuntimeArgs.MetricDB, RuntimeArgs.MetricSeriesTable, RuntimeArgs.MetricTablePrefix)
if err != nil {
glog.Fatal(err)
}
glog.Info("Registering services...")
grpcServer := grpc.NewServer()
gwimpl.RegisterServer(&mctx, grpcServer)
glog.Info("Starting up services...")
httpEndpoint := fmt.Sprintf("0.0.0.0:%d", RuntimeArgs.HttpPort)
listenStr := fmt.Sprintf("0.0.0.0:%d", RuntimeArgs.GrpcPort)
lis, err := net.Listen("tcp", listenStr)
if err != nil {
glog.Fatalf("Error listening: %v\n", err)
}
ctx := context.Background()
ctx, cancel := context.WithCancel(ctx)
defer cancel()
go func() {
// Setup HTTP service
if err := runHttpService(httpEndpoint, listenStr, ctx); err != nil {
glog.Fatal(err)
}
defer func() {
glog.Info("Http service exiting...")
}()
}()
// Start GRPC service
glog.Infof("grpc listening on %s", listenStr)
grpcServer.Serve(lis)
}