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67 lines
2.3 KiB
Python
67 lines
2.3 KiB
Python
"""Customized requests.Session that automatically traces outbound HTTP calls."""
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from typing import Any, Optional
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import logging
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import time
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import requests
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from tracing.tracer import get_tracer, TraceSpan
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# Limit for raw JSON string preview (in characters)
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_PREVIEW_MAX_CHARS = 512
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logger = logging.getLogger("tracer")
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class TracedSession(requests.Session):
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def request(self, method: str, url: str, *args: Any, **kwargs: Any) -> requests.Response:
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tracer = get_tracer()
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headers = kwargs.get("headers") or {}
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if headers is None:
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headers = {}
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kwargs["headers"] = headers
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span_name = f"HTTP {method} {url}"
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with tracer.start_as_current_span(span_name, kind="CLIENT") as span:
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span.set_attribute("http.method", method)
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span.set_attribute("http.url", url)
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span.set_attribute("request_is_sync", True)
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tracer.inject_outbound_headers(headers)
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try:
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response = super().request(method, url, *args, **kwargs)
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except Exception as exc:
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span.set_status("ERROR", str(exc))
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raise
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else:
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span.set_attribute("http.status_code", response.status_code)
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_record_outbound_json_preview(response, span)
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return response
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finally:
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duration_ms = (time.time_ns() - span.start_ns) / 1_000_000.0
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span.set_attribute("request_duration_ms", duration_ms)
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_default_session: Optional[TracedSession] = None
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def get_traced_session() -> TracedSession:
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global _default_session
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if _default_session is None:
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_default_session = TracedSession()
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return _default_session
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def _record_outbound_json_preview(response: requests.Response, span: TraceSpan) -> None:
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"""If response is JSON, attach small part of it to span"""
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try:
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content_type = str(response.headers.get('Content-Type', '')).lower()
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if 'application/json' not in content_type:
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return
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text = response.text # requests will decode using inferred/declared encoding
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span.set_attribute('http.response.body.size', len(text))
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span.set_attribute('http.response.json', text[:_PREVIEW_MAX_CHARS])
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except Exception:
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logger.exception("Could not extract JSON response body")
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