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root.go
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root.go
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package cmd
import (
"context"
"fmt"
"github.com/terrariumcloud/terrarium/internal/storage"
"log"
"net"
"net/http"
"os"
"go.opentelemetry.io/otel/propagation"
"github.com/terrariumcloud/terrarium/internal/restapi"
"github.com/terrariumcloud/terrarium/internal/module/services"
"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
"go.opentelemetry.io/otel/sdk/resource"
"go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.17.0"
noop "go.opentelemetry.io/otel/trace"
"github.com/spf13/cobra"
"google.golang.org/grpc"
)
var (
buildVersion string
)
const (
defaultEndpoint = "0.0.0.0:3001"
)
var (
endpoint = defaultEndpoint
awsSessionConfig = storage.AWSSessionConfig{}
opentelemetryInited = false
rootCmd = &cobra.Command{
Use: "terrarium",
Short: "Terrarium Services",
Long: "Runs backend that exposes Terrarium Services",
}
)
func init() {
rootCmd.PersistentFlags().StringVarP(&endpoint, "endpoint", "e", defaultEndpoint, "Endpoint")
rootCmd.PersistentFlags().StringVarP(&awsSessionConfig.Key, "aws-access-key-id", "k", "", "AWS Access Key")
rootCmd.PersistentFlags().StringVarP(&awsSessionConfig.Secret, "aws-secret-access-key", "s", "", "AWS Secret Key")
rootCmd.PersistentFlags().StringVarP(&awsSessionConfig.Region, "aws-region", "r", "", "AWS Region")
rootCmd.PersistentFlags().BoolVar(&awsSessionConfig.UseLocalStack, "use-localstack", false, "Connect to a localstack instance rather than AWS.")
}
func newTraceExporter(ctx context.Context) (*otlptrace.Exporter, error) {
if otelEndpoint, found := os.LookupEnv("OTEL_EXPORTER_OTLP_ENDPOINT"); found {
fmt.Printf("Created exporter")
client := otlptracegrpc.NewClient(
otlptracegrpc.WithEndpoint(otelEndpoint),
otlptracegrpc.WithInsecure(),
)
exp, err := otlptrace.New(ctx, client)
if err != nil {
return nil, err
}
return exp, nil
} else {
return nil, nil
}
}
func newServiceResource(name string) *resource.Resource {
versionInfo := buildVersion
if serviceVersion, found := os.LookupEnv("OTEL_SERVICE_VERSION"); found {
log.Println("Warning: build time version overriden by environment variable")
versionInfo = serviceVersion
}
resources := resource.NewWithAttributes(
semconv.SchemaURL,
semconv.ServiceNameKey.String(name),
semconv.ServiceVersionKey.String(versionInfo),
)
return resources
}
func initOpenTelemetry(name string) func() {
opentelemetryInited = true
ctx := context.Background()
traceExporter, err := newTraceExporter(ctx)
if err != nil {
log.Fatal(err)
}
if traceExporter != nil {
tracerProvider := trace.NewTracerProvider(
trace.WithSampler(trace.AlwaysSample()),
trace.WithBatcher(traceExporter),
trace.WithResource(newServiceResource(name)),
)
otel.SetTracerProvider(tracerProvider)
return func() {
if err := tracerProvider.Shutdown(context.Background()); err != nil {
log.Fatal(err)
}
}
} else {
otel.SetTracerProvider(noop.NewNoopTracerProvider())
}
otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))
return func() {
// No-op
}
}
func startGRPCService(name string, service services.Service) {
log.Printf("Starting %s", name)
if !opentelemetryInited {
otelShutdown := initOpenTelemetry(name)
defer otelShutdown()
}
listener, err := net.Listen("tcp4", endpoint)
if err != nil {
log.Fatalf("Failed to start: %v", err)
}
grpcServer := grpc.NewServer(
grpc.UnaryInterceptor(otelgrpc.UnaryServerInterceptor()),
grpc.StreamInterceptor(otelgrpc.StreamServerInterceptor()),
)
if err := service.RegisterWithServer(grpcServer); err != nil {
log.Fatalf("Failed to start: %v", err)
}
log.Printf("Listening at %s", endpoint)
if err := grpcServer.Serve(listener); err != nil {
log.Fatalf("Failed: %v", err)
}
}
func startRESTAPIService(name, mountPath string, rootHandler restapi.RESTAPIHandler) {
log.Printf("Starting %s", name)
if !opentelemetryInited {
otelShutdown := initOpenTelemetry(name)
defer otelShutdown()
}
log.Printf("Listening on %s", endpoint)
if err := http.ListenAndServe(endpoint, rootHandler.GetHttpHandler(mountPath)); err != nil {
log.Fatalf("Failed: %v", err)
}
}
// Execute root command
func Execute(serviceVersion string) {
buildVersion = serviceVersion
cobra.CheckErr(rootCmd.Execute())
}