Module metadata 

HTTP header <-> gRPC metadata conversion, protobuf metadata <-> gRPC metadata conversion, and grpc-timeout parsing. Shared by the proxy and the native server library.

Functions

format_grpc_timeout

Build a grpc-timeout header value from a Duration (millisecond unit).

grpc_timeout_from_millis

Convert a Subscribe.timeout_millis field (0 = no deadline) to a Duration.

is_denied

merge_metadata_into_headers

Merge gRPC metadata into HTTP headers, skipping the denylist.

metadata_to_vec

Convert a gRPC metadata map into a protobuf metadata list for a frame — the inverse of metadata_vec_to_metadata, so a -bin value is base64-decoded back to raw bytes.

metadata_vec_to_metadata

Convert a protobuf metadata list (from a frame) into a gRPC metadata map.

parse_grpc_timeout

Parse a gRPC grpc-timeout header (e.g. 100m, 5S) into a Duration.

percent_decode

Minimal gRPC grpc-message percent-decoding (%XX).

percent_encode

Minimal percent-encoding for a grpc-message header value.

read_status

Read the gRPC status (code, message) from a response’s trailers, falling back to its headers (a “trailers-only” response carries the status in the headers). The grpc-message value is percent-decoded.

request_headers_to_metadata

Copy request headers into a gRPC metadata map, minus the denylist.