feat(gcs): single HTTP call for Get using XML API metadata

Remove WithJSONReads() and use the default XML API, which returns custom
metadata (x-goog-meta-*) in the read response headers. This allows Get()
to fetch both the object body and metadata in a single NewReader() call
instead of the previous Attrs() + NewReader() two-call pattern.

This should roughly halve GCS GET latency. Anywhere Cache works
transparently regardless of API choice (JSON/XML/gRPC) so this is safe.

Requires cloud.google.com/go/storage v1.49.0+ for Reader.Metadata().

Made-with: Cursor

Author: aleclerc-cio

go.mod

@@ -1,23 +1,29 @@
 module github.com/richardartoul/gobuildcache
 
-go 1.25
+go 1.25.0
 
 require (
-	cloud.google.com/go/storage v1.40.0
+	cloud.google.com/go/storage v1.61.3
 	github.com/DataDog/sketches-go v1.4.6
 	github.com/aws/aws-sdk-go-v2 v1.32.7
 	github.com/aws/aws-sdk-go-v2/config v1.28.7
 	github.com/aws/aws-sdk-go-v2/service/s3 v1.71.1
 	github.com/gofrs/flock v0.13.0
 	github.com/pierrec/lz4/v4 v4.1.23
-	google.golang.org/api v0.170.0
+	google.golang.org/api v0.271.0
 )
 
 require (
-	cloud.google.com/go v0.112.1 // indirect
-	cloud.google.com/go/compute v1.24.0 // indirect
-	cloud.google.com/go/compute/metadata v0.2.3 // indirect
-	cloud.google.com/go/iam v1.1.7 // indirect
+	cel.dev/expr v0.25.1 // indirect
+	cloud.google.com/go v0.123.0 // indirect
+	cloud.google.com/go/auth v0.18.2 // indirect
+	cloud.google.com/go/auth/oauth2adapt v0.2.8 // indirect
+	cloud.google.com/go/compute/metadata v0.9.0 // indirect
+	cloud.google.com/go/iam v1.5.3 // indirect
+	cloud.google.com/go/monitoring v1.24.3 // indirect
+	github.com/GoogleCloudPlatform/opentelemetry-operations-go/detectors/gcp v1.30.0 // indirect
+	github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/metric v0.55.0 // indirect
+	github.com/GoogleCloudPlatform/opentelemetry-operations-go/internal/resourcemapping v0.55.0 // indirect
 	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.6.7 // indirect
 	github.com/aws/aws-sdk-go-v2/credentials v1.17.48 // indirect
 	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.22 // indirect
@@ -33,32 +39,39 @@ require (
 	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.28.7 // indirect
 	github.com/aws/aws-sdk-go-v2/service/sts v1.33.3 // indirect
 	github.com/aws/smithy-go v1.22.1 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/cncf/xds/go v0.0.0-20251210132809-ee656c7534f5 // indirect
+	github.com/envoyproxy/go-control-plane/envoy v1.36.0 // indirect
+	github.com/envoyproxy/protoc-gen-validate v1.3.0 // indirect
 	github.com/felixge/httpsnoop v1.0.4 // indirect
-	github.com/go-logr/logr v1.4.1 // indirect
+	github.com/go-jose/go-jose/v4 v4.1.3 // indirect
+	github.com/go-logr/logr v1.4.3 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
-	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
-	github.com/golang/protobuf v1.5.4 // indirect
-	github.com/google/s2a-go v0.1.7 // indirect
+	github.com/google/s2a-go v0.1.9 // indirect
 	github.com/google/uuid v1.6.0 // indirect
-	github.com/googleapis/enterprise-certificate-proxy v0.3.2 // indirect
-	github.com/googleapis/gax-go/v2 v2.12.3 // indirect
-	go.opencensus.io v0.24.0 // indirect
-	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.49.0 // indirect
-	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.49.0 // indirect
-	go.opentelemetry.io/otel v1.24.0 // indirect
-	go.opentelemetry.io/otel/metric v1.24.0 // indirect
-	go.opentelemetry.io/otel/trace v1.24.0 // indirect
-	golang.org/x/crypto v0.21.0 // indirect
-	golang.org/x/net v0.22.0 // indirect
-	golang.org/x/oauth2 v0.18.0 // indirect
-	golang.org/x/sync v0.6.0 // indirect
-	golang.org/x/sys v0.37.0 // indirect
-	golang.org/x/text v0.14.0 // indirect
-	golang.org/x/time v0.5.0 // indirect
-	google.golang.org/appengine v1.6.8 // indirect
-	google.golang.org/genproto v0.0.0-20240213162025-012b6fc9bca9 // indirect
-	google.golang.org/genproto/googleapis/api v0.0.0-20240314234333-6e1732d8331c // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20240311132316-a219d84964c2 // indirect
-	google.golang.org/grpc v1.62.1 // indirect
-	google.golang.org/protobuf v1.33.0 // indirect
+	github.com/googleapis/enterprise-certificate-proxy v0.3.14 // indirect
+	github.com/googleapis/gax-go/v2 v2.17.0 // indirect
+	github.com/planetscale/vtprotobuf v0.6.1-0.20240319094008-0393e58bdf10 // indirect
+	github.com/spiffe/go-spiffe/v2 v2.6.0 // indirect
+	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
+	go.opentelemetry.io/contrib/detectors/gcp v1.39.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.63.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.61.0 // indirect
+	go.opentelemetry.io/otel v1.40.0 // indirect
+	go.opentelemetry.io/otel/metric v1.40.0 // indirect
+	go.opentelemetry.io/otel/sdk v1.40.0 // indirect
+	go.opentelemetry.io/otel/sdk/metric v1.40.0 // indirect
+	go.opentelemetry.io/otel/trace v1.40.0 // indirect
+	golang.org/x/crypto v0.48.0 // indirect
+	golang.org/x/net v0.51.0 // indirect
+	golang.org/x/oauth2 v0.36.0 // indirect
+	golang.org/x/sync v0.20.0 // indirect
+	golang.org/x/sys v0.42.0 // indirect
+	golang.org/x/text v0.34.0 // indirect
+	golang.org/x/time v0.15.0 // indirect
+	google.golang.org/genproto v0.0.0-20260128011058-8636f8732409 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20260203192932-546029d2fa20 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20260226221140-a57be14db171 // indirect
+	google.golang.org/grpc v1.79.2 // indirect
+	google.golang.org/protobuf v1.36.11 // indirect
 )