feat(tvix/store/nar-bridge): Setup OpenTelemetry r/7442

Sets up OpenTelemetry integration for nar-bridge. Right now it will
export spans for HTTP server requests and all gRPC client requests.
Having the spans available will make performance work significantly
easier as it provides a high level overview of where time is being
spent.

In the future we can add application-specifc metrics and
integrate logrus.

Change-Id: Ie3860675d7ffc626a95673ba062c3c798d8bb2a7
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10678
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Autosubmit: Connor Brewster <cbrewster@hey.com>

6 files changed, 200 insertions, 34 deletions

diff --git a/tvix/nar-bridge/cmd/nar-bridge-http/main.go b/tvix/nar-bridge/cmd/nar-bridge-http/main.go
index 2eed4f4f4c4b..171ea7f5bdd0 100644
--- a/tvix/nar-bridge/cmd/nar-bridge-http/main.go
+++ b/tvix/nar-bridge/cmd/nar-bridge-http/main.go
@@ -4,17 +4,18 @@ import (
 	"context"
 	"os"
 	"os/signal"
+	"runtime/debug"
 	"time"
 
 	"github.com/alecthomas/kong"
 
+	"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials/insecure"
 
 	castorev1pb "code.tvl.fyi/tvix/castore-go"
 	narBridgeHttp "code.tvl.fyi/tvix/nar-bridge/pkg/http"
 	storev1pb "code.tvl.fyi/tvix/store-go"
-	"github.com/sirupsen/logrus"
 	log "github.com/sirupsen/logrus"
 )
 
@@ -24,24 +25,41 @@ var cli struct {
 	ListenAddr      string `name:"listen-addr" help:"The address this service listens on" type:"string" default:"[::]:9000"`                    //nolint:lll
 	EnableAccessLog bool   `name:"access-log" help:"Enable access logging" type:"bool" default:"true" negatable:""`                             //nolint:lll
 	StoreAddr       string `name:"store-addr" help:"The address to the tvix-store RPC interface this will connect to" default:"localhost:8000"` //nolint:lll
+	EnableOtlp      bool   `name:"otlp" help:"Enable OpenTelemetry for logs, spans, and metrics" default:"true"`                                //nolint:lll
 }
 
 func main() {
 	_ = kong.Parse(&cli)
 
-	logLevel, err := logrus.ParseLevel(cli.LogLevel)
+	logLevel, err := log.ParseLevel(cli.LogLevel)
 	if err != nil {
 		log.Panic("invalid log level")
 		return
 	}
-	logrus.SetLevel(logLevel)
+	log.SetLevel(logLevel)
 
 	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt)
 	defer stop()
 
+	if cli.EnableOtlp {
+		buildInfo, ok := debug.ReadBuildInfo()
+		if !ok {
+			log.Fatal("failed to read build info")
+		}
+
+		shutdown, err := setupOpenTelemetry(ctx, "nar-bridge", buildInfo.Main.Version)
+		if err != nil {
+			log.WithError(err).Fatal("failed to setup OpenTelemetry")
+		}
+		defer shutdown(context.Background())
+	}
+
 	// connect to tvix-store
 	log.Debugf("Dialing to %v", cli.StoreAddr)
-	conn, err := grpc.DialContext(ctx, cli.StoreAddr, grpc.WithTransportCredentials(insecure.NewCredentials()))
+	conn, err := grpc.DialContext(ctx, cli.StoreAddr,
+		grpc.WithTransportCredentials(insecure.NewCredentials()),
+		grpc.WithStatsHandler(otelgrpc.NewClientHandler()),
+	)
 	if err != nil {
 		log.Fatalf("did not connect: %v", err)
 	}
diff --git a/tvix/nar-bridge/cmd/nar-bridge-http/otel.go b/tvix/nar-bridge/cmd/nar-bridge-http/otel.go
new file mode 100644
index 000000000000..c446c6ec1a14
--- /dev/null
+++ b/tvix/nar-bridge/cmd/nar-bridge-http/otel.go
@@ -0,0 +1,87 @@
+package main
+
+import (
+	"context"
+	"errors"
+
+	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc"
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
+	"go.opentelemetry.io/otel/propagation"
+	"go.opentelemetry.io/otel/sdk/metric"
+	"go.opentelemetry.io/otel/sdk/resource"
+	"go.opentelemetry.io/otel/sdk/trace"
+	semconv "go.opentelemetry.io/otel/semconv/v1.24.0"
+)
+
+func setupOpenTelemetry(ctx context.Context, serviceName, serviceVersion string) (func(context.Context) error, error) {
+	var shutdownFuncs []func(context.Context) error
+	shutdown := func(ctx context.Context) error {
+		var err error
+		for _, fn := range shutdownFuncs {
+			err = errors.Join(err, fn(ctx))
+		}
+		shutdownFuncs = nil
+		return err
+	}
+
+	res, err := resource.Merge(
+		resource.Default(),
+		resource.NewWithAttributes(
+			semconv.SchemaURL,
+			semconv.ServiceName(serviceName),
+			semconv.ServiceVersion(serviceVersion),
+		),
+	)
+	if err != nil {
+		return nil, errors.Join(err, shutdown(ctx))
+	}
+
+	prop := propagation.NewCompositeTextMapPropagator(
+		propagation.TraceContext{},
+		propagation.Baggage{},
+	)
+	otel.SetTextMapPropagator(prop)
+
+	tracerProvider, err := newTraceProvider(ctx, res)
+	if err != nil {
+		return nil, errors.Join(err, shutdown(ctx))
+	}
+	shutdownFuncs = append(shutdownFuncs, tracerProvider.Shutdown)
+	otel.SetTracerProvider(tracerProvider)
+
+	meterProvider, err := newMeterProvider(ctx, res)
+	if err != nil {
+		return nil, errors.Join(err, shutdown(ctx))
+	}
+	shutdownFuncs = append(shutdownFuncs, meterProvider.Shutdown)
+	otel.SetMeterProvider(meterProvider)
+
+	return shutdown, nil
+}
+
+func newTraceProvider(ctx context.Context, res *resource.Resource) (*trace.TracerProvider, error) {
+	traceExporter, err := otlptracegrpc.New(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	traceProvider := trace.NewTracerProvider(
+		trace.WithBatcher(traceExporter),
+		trace.WithResource(res),
+	)
+	return traceProvider, nil
+}
+
+func newMeterProvider(ctx context.Context, res *resource.Resource) (*metric.MeterProvider, error) {
+	metricExporter, err := otlpmetricgrpc.New(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	meterProvider := metric.NewMeterProvider(
+		metric.WithResource(res),
+		metric.WithReader(metric.NewPeriodicReader(metricExporter)),
+	)
+	return meterProvider, nil
+}
diff --git a/tvix/nar-bridge/default.nix b/tvix/nar-bridge/default.nix
index 18709d0e7367..d28d6f972422 100644
--- a/tvix/nar-bridge/default.nix
+++ b/tvix/nar-bridge/default.nix
@@ -6,5 +6,5 @@ pkgs.buildGoModule {
   name = "nar-bridge";
   src = depot.third_party.gitignoreSource ./.;
 
-  vendorHash = "sha256-fMZiHb/81/8hQfKXD4b2nwbuSFiNQf1eYxIuAx+93Po=";
+  vendorHash = "sha256-9tEpICef6xCuRQwyXCg15KugcvknnP53WHotohcbeis=";
 }
diff --git a/tvix/nar-bridge/go.mod b/tvix/nar-bridge/go.mod
index 8a2743018e94..175f7edcfde9 100644
--- a/tvix/nar-bridge/go.mod
+++ b/tvix/nar-bridge/go.mod
@@ -6,30 +6,46 @@ require (
 	github.com/alecthomas/kong v0.7.1
 	github.com/go-chi/chi v1.5.4
 	github.com/go-chi/chi/v5 v5.0.7
-	github.com/google/go-cmp v0.5.9
+	github.com/google/go-cmp v0.6.0
 	github.com/multiformats/go-multihash v0.2.1
 	github.com/nix-community/go-nix v0.0.0-20231012070617-9b176785e54d
 	github.com/sirupsen/logrus v1.9.0
-	github.com/stretchr/testify v1.8.1
-	github.com/ulikunitz/xz v0.5.11
-	google.golang.org/grpc v1.59.0
-	google.golang.org/protobuf v1.31.0
+	github.com/stretchr/testify v1.8.4
+	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.47.0
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.47.0
+	go.opentelemetry.io/otel v1.22.0
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v0.45.0
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.22.0
+	go.opentelemetry.io/otel/sdk v1.22.0
+	go.opentelemetry.io/otel/sdk/metric v1.22.0
+	google.golang.org/grpc v1.60.1
+	google.golang.org/protobuf v1.32.0
 	lukechampine.com/blake3 v1.2.1
 )
 
 require (
+	github.com/cenkalti/backoff/v4 v4.2.1 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/felixge/httpsnoop v1.0.4 // indirect
+	github.com/go-logr/logr v1.4.1 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.16.0 // indirect
 	github.com/klauspost/cpuid/v2 v2.2.5 // indirect
 	github.com/minio/sha256-simd v1.0.0 // indirect
 	github.com/mr-tron/base58 v1.2.0 // indirect
 	github.com/multiformats/go-varint v0.0.6 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/spaolacci/murmur3 v1.1.0 // indirect
-	golang.org/x/crypto v0.14.0 // indirect
-	golang.org/x/net v0.17.0 // indirect
-	golang.org/x/sys v0.14.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.22.0 // indirect
+	go.opentelemetry.io/otel/metric v1.22.0 // indirect
+	go.opentelemetry.io/otel/trace v1.22.0 // indirect
+	go.opentelemetry.io/proto/otlp v1.0.0 // indirect
+	golang.org/x/crypto v0.18.0 // indirect
+	golang.org/x/net v0.20.0 // indirect
+	golang.org/x/sys v0.16.0 // indirect
 	golang.org/x/text v0.14.0 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20231002182017-d307bd883b97 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20231030173426-d783a09b4405 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
diff --git a/tvix/nar-bridge/go.sum b/tvix/nar-bridge/go.sum
index e77c66e7ee47..2c1bac78ccf7 100644
--- a/tvix/nar-bridge/go.sum
+++ b/tvix/nar-bridge/go.sum
@@ -1,3 +1,5 @@
+cloud.google.com/go/compute v1.23.0 h1:tP41Zoavr8ptEqaW6j+LQOnyBBhO7OkOMAGrgLopTwY=
+cloud.google.com/go/compute/metadata v0.2.3 h1:mg4jlk7mCAj6xXp9UJ4fjI9VUI5rubuGBW5aJ7UnBMY=
 code.tvl.fyi/tvix/castore-go v0.0.0-20231105151352-990d6ba2175e h1:Nj+anfyEYeEdhnIo2BG/N1ZwQl1IvI7AH3TbNDLwUOA=
 code.tvl.fyi/tvix/castore-go v0.0.0-20231105151352-990d6ba2175e/go.mod h1:+vKbozsa04yy2TWh3kUVU568jaza3Hf0p1jAEoMoCwA=
 code.tvl.fyi/tvix/store-go v0.0.0-20231105203234-f2baad42494f h1:bN3K7oSu3IAHXqS3ETHUgpBPHF9+awKKBRLiM8/1tmI=
@@ -6,23 +8,39 @@ github.com/alecthomas/assert/v2 v2.1.0 h1:tbredtNcQnoSd3QBhQWI7QZ3XHOVkw1Moklp2o
 github.com/alecthomas/kong v0.7.1 h1:azoTh0IOfwlAX3qN9sHWTxACE2oV8Bg2gAwBsMwDQY4=
 github.com/alecthomas/kong v0.7.1/go.mod h1:n1iCIO2xS46oE8ZfYCNDqdR0b0wZNrXAIAqro/2132U=
 github.com/alecthomas/repr v0.1.0 h1:ENn2e1+J3k09gyj2shc0dHr/yjaWSHRlrJ4DPMevDqE=
+github.com/cenkalti/backoff/v4 v4.2.1 h1:y4OZtCnogmCPw98Zjyt5a6+QwPLGkiQsYW5oUqylYbM=
+github.com/cenkalti/backoff/v4 v4.2.1/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyYozVcomhLiZE=
+github.com/cncf/xds/go v0.0.0-20230607035331-e9ce68804cb4 h1:/inchEIKaYC1Akx+H+gqO04wryn5h75LSazbRlnya1k=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/envoyproxy/protoc-gen-validate v1.0.2 h1:QkIBuU5k+x7/QXPvPPnWXWlCdaBFApVqftFV6k087DA=
+github.com/felixge/httpsnoop v1.0.4 h1:NFTV2Zj1bL4mc9sqWACXbQFVBBg2W3GPvqp8/ESS2Wg=
+github.com/felixge/httpsnoop v1.0.4/go.mod h1:m8KPJKqk1gH5J9DgRY2ASl2lWCfGKXixSwevea8zH2U=
 github.com/go-chi/chi v1.5.4 h1:QHdzF2szwjqVV4wmByUnTcsbIg7UGaQ0tPF2t5GcAIs=
 github.com/go-chi/chi v1.5.4/go.mod h1:uaf8YgoFazUOkPBG7fxPftUylNumIev9awIWOENIuEg=
 github.com/go-chi/chi/v5 v5.0.7 h1:rDTPXLDHGATaeHvVlLcR4Qe0zftYethFucbjVQ1PxU8=
 github.com/go-chi/chi/v5 v5.0.7/go.mod h1:DslCQbL2OYiznFReuXYUmQ2hGd1aDpCnlMNITLSKoi8=
+github.com/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
+github.com/go-logr/logr v1.4.1 h1:pKouT5E8xu9zeFC39JXRDukb6JFQPXM5p5I91188VAQ=
+github.com/go-logr/logr v1.4.1/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
+github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
+github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
+github.com/golang/glog v1.1.2 h1:DVjP2PbBOzHyzA+dn3WhHIq4NdVu3Q+pvivFICf/7fo=
 github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
 github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg=
 github.com/golang/protobuf v1.5.3/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
-github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/grpc-ecosystem/grpc-gateway/v2 v2.16.0 h1:YBftPWNWd4WwGqtY2yeZL2ef8rHAxPBD8KFhJpmcqms=
+github.com/grpc-ecosystem/grpc-gateway/v2 v2.16.0/go.mod h1:YN5jB8ie0yfIUg6VvR9Kz84aCaG7AsGZnLjhHbUqwPg=
 github.com/hexops/gotextdiff v1.0.3 h1:gitA9+qJrrTCsiCl7+kh75nPqQt1cx4ZkudSTLoUqJM=
 github.com/klauspost/cpuid/v2 v2.0.4/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa0213Md/qVLRg=
 github.com/klauspost/cpuid/v2 v2.2.5 h1:0E5MSMDEoAulmXNFquVs//DdoomxaoTY1kUhbc/qbZg=
 github.com/klauspost/cpuid/v2 v2.2.5/go.mod h1:Lcz8mBdAVJIBVzewtcLocK12l3Y+JytZYpaMropDUws=
+github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
+github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/minio/sha256-simd v1.0.0 h1:v1ta+49hkWZyvaKwrQB8elexRqm6Y0aMLjCNsrYxo6g=
 github.com/minio/sha256-simd v1.0.0/go.mod h1:OuYzVNI5vcoYIAmbIvHPl3N3jUzVedXbKy5RFepssQM=
 github.com/mr-tron/base58 v1.2.0 h1:T/HDJBh4ZCPbU39/+c3rRvE0uKBQlU27+QI8LJ4t64o=
@@ -35,41 +53,64 @@ github.com/nix-community/go-nix v0.0.0-20231012070617-9b176785e54d h1:kwc1ivTuSt
 github.com/nix-community/go-nix v0.0.0-20231012070617-9b176785e54d/go.mod h1:4ZJah5sYrUSsWXIOJIsQ6iVOQyLO+ffhWXU3gblcO+E=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/rogpeppe/go-internal v1.11.0 h1:cWPaGQEPrBb5/AsnsZesgZZ9yb1OQ+GOISoDNXVBh4M=
 github.com/sirupsen/logrus v1.9.0 h1:trlNQbNUG3OdDrDil03MCb1H2o9nJ1x4/5LYw7byDE0=
 github.com/sirupsen/logrus v1.9.0/go.mod h1:naHLuLoDiP4jHNo9R0sCBMtWGeIprob74mVsIT4qYEQ=
 github.com/spaolacci/murmur3 v1.1.0 h1:7c1g84S4BPRrfL5Xrdp6fOJ206sU9y293DDHaoy0bLI=
 github.com/spaolacci/murmur3 v1.1.0/go.mod h1:JwIasOWyU6f++ZhiEuf87xNszmSA2myDM2Kzu9HwQUA=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
-github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
-github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk=
-github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
-github.com/ulikunitz/xz v0.5.11 h1:kpFauv27b6ynzBNT/Xy+1k+fK4WswhN/6PN5WhFAGw8=
-github.com/ulikunitz/xz v0.5.11/go.mod h1:nbz6k7qbPmH4IRqmfOplQw/tblSgqTqBwxkY0oWt/14=
-golang.org/x/crypto v0.14.0 h1:wBqGXzWJW6m1XrIKlAH0Hs1JJ7+9KBwnIO8v66Q9cHc=
-golang.org/x/crypto v0.14.0/go.mod h1:MVFd36DqK4CsrnJYDkBA3VC4m2GkXAM0PvzMCn4JQf4=
-golang.org/x/net v0.17.0 h1:pVaXccu2ozPjCXewfr1S7xza/zcXTity9cCdXQYSjIM=
-golang.org/x/net v0.17.0/go.mod h1:NxSsAGuq816PNPmqtQdLE42eU2Fs7NoRIZrHJAlaCOE=
+github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
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diff --git a/tvix/nar-bridge/pkg/http/server.go b/tvix/nar-bridge/pkg/http/server.go
index 500902f262f0..aecbd54aec16 100644
--- a/tvix/nar-bridge/pkg/http/server.go
+++ b/tvix/nar-bridge/pkg/http/server.go
@@ -12,6 +12,7 @@ import (
 	"github.com/go-chi/chi/middleware"
 	"github.com/go-chi/chi/v5"
 	log "github.com/sirupsen/logrus"
+	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
 )
 
 type Server struct {
@@ -46,6 +47,9 @@ func New(
 	priority int,
 ) *Server {
 	r := chi.NewRouter()
+	r.Use(func(h http.Handler) http.Handler {
+		return otelhttp.NewHandler(h, "http.request")
+	})
 
 	if enableAccessLog {
 		r.Use(middleware.Logger)