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Diffstat (limited to '')
| -rw-r--r-- | synapse/logging/opentracing.py | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/synapse/logging/opentracing.py b/synapse/logging/opentracing.py index 4f18792c99..140ed711e3 100644 --- a/synapse/logging/opentracing.py +++ b/synapse/logging/opentracing.py @@ -173,6 +173,7 @@ from typing import TYPE_CHECKING, Collection, Dict, List, Optional, Pattern, Typ import attr from twisted.internet import defer +from twisted.web.http_headers import Headers from synapse.config import ConfigError from synapse.util import json_decoder, json_encoder @@ -668,6 +669,25 @@ def inject_header_dict( headers[key.encode()] = [value.encode()] +def inject_response_headers(response_headers: Headers) -> None: + """Inject the current trace id into the HTTP response headers""" + if not opentracing: + return + span = opentracing.tracer.active_span + if not span: + return + + # This is a bit implementation-specific. + # + # Jaeger's Spans have a trace_id property; other implementations (including the + # dummy opentracing.span.Span which we use if init_tracer is not called) do not + # expose it + trace_id = getattr(span, "trace_id", None) + + if trace_id is not None: + response_headers.addRawHeader("Synapse-Trace-Id", f"{trace_id:x}") + + @ensure_active_span("get the active span context as a dict", ret={}) def get_active_span_text_map(destination=None): """ @@ -843,6 +863,7 @@ def trace_servlet(request: "SynapseRequest", extract_context: bool = False): scope = start_active_span(request_name) with scope: + inject_response_headers(request.responseHeaders) try: yield finally: |