feat: ability to configure the min size for response compression

Author: DanTan

router/core/graph_server.go

@@ -283,7 +283,7 @@ func newGraphServer(ctx context.Context, r *Router, routerConfig *nodev1.RouterC
 	}
 
 	wrapper, err := gzhttp.NewWrapper(
-		gzhttp.MinSize(1024*4), // 4KB
+		gzhttp.MinSize(int(s.routerTrafficConfig.ResponseCompressionMinSize)),
 		gzhttp.CompressionLevel(gzip.DefaultCompression),
 		gzhttp.ContentTypes(CompressibleContentTypes),
 	)

router/pkg/config/config.go

@@ -181,6 +181,8 @@ type RouterTrafficConfiguration struct {
 	MaxHeaderBytes BytesString `yaml:"max_header_bytes" envDefault:"0MiB" env:"MAX_HEADER_BYTES"`
 	// DecompressionEnabled is the configuration for request compression
 	DecompressionEnabled bool `yaml:"decompression_enabled" envDefault:"true"`
+	// ResponseCompressionMinSize is the minimum size of the response body in bytes to enable response compression
+	ResponseCompressionMinSize BytesString `yaml:"response_compression_min_size" envDefault:"4KB"`
 }
 
 type GlobalSubgraphRequestRule struct {

router/pkg/config/config.schema.json

@@ -1468,6 +1468,12 @@
               "type": "boolean",
               "description": "When enabled, the router will check incoming requests for a 'Content-Encoding' header and decompress the body accordingly. Currently only gzip is supported",
               "default": true
+            },
+            "response_compression_min_size": {
+              "type": "string",
+              "description": "The minimum size of the response body in bytes to enable response compression. The size is specified as a string with a number and a unit, e.g. 10KB, 1MB, 1GB. The supported units are 'KB', 'MB', 'GB'.",
+              "default": "4KB",
+              "bytes": {}
             }
           }
         },

router/pkg/config/fixtures/full.yaml

@@ -198,6 +198,7 @@ traffic_shaping:
     max_request_body_size: 5MB
     max_header_bytes: 4MiB
     decompression_enabled: false
+    response_compression_min_size: 4KB
   all: # Rules are applied to all subgraph requests.
     # Subgraphs transport options
     request_timeout: 60s