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| 1 | +# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. |
| 2 | +# SPDX-License-Identifier: Apache-2.0 |
| 3 | +import base64 |
| 4 | +import os |
| 5 | +import socket |
| 6 | +from logging import Logger, getLogger |
| 7 | +from typing import Optional, Sequence, Tuple |
| 8 | + |
| 9 | +from typing_extensions import override |
| 10 | + |
| 11 | +from opentelemetry.exporter.otlp.proto.common.trace_encoder import encode_spans |
| 12 | +from opentelemetry.sdk.trace import ReadableSpan |
| 13 | +from opentelemetry.sdk.trace.export import SpanExporter, SpanExportResult |
| 14 | + |
| 15 | +DEFAULT_ENDPOINT = "127.0.0.1:2000" |
| 16 | +PROTOCOL_HEADER = '{"format":"json","version":1}\n' |
| 17 | + |
| 18 | +FORMAT_OTEL_SAMPLED_TRACES_BINARY_PREFIX = "T1S" |
| 19 | +FORMAT_OTEL_UNSAMPLED_TRACES_BINARY_PREFIX = "T1U" |
| 20 | + |
| 21 | +_logger: Logger = getLogger(__name__) |
| 22 | + |
| 23 | + |
| 24 | +class UdpExporter: |
| 25 | + def __init__(self, endpoint: Optional[str] = None): |
| 26 | + self._endpoint = endpoint or DEFAULT_ENDPOINT |
| 27 | + self._host, self._port = self._parse_endpoint(self._endpoint) |
| 28 | + self._socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) |
| 29 | + self._socket.setblocking(False) |
| 30 | + |
| 31 | + def send_data(self, data: bytes, signal_format_prefix: str): |
| 32 | + # base64 encoding and then converting to string with utf-8 |
| 33 | + base64_encoded_string: str = base64.b64encode(data).decode("utf-8") |
| 34 | + message = f"{PROTOCOL_HEADER}{signal_format_prefix}{base64_encoded_string}" |
| 35 | + |
| 36 | + try: |
| 37 | + _logger.debug("Sending UDP data: %s", message) |
| 38 | + self._socket.sendto(message.encode("utf-8"), (self._host, int(self._port))) |
| 39 | + except Exception as exc: # pylint: disable=broad-except |
| 40 | + _logger.error("Error sending UDP data: %s", exc) |
| 41 | + raise |
| 42 | + |
| 43 | + def shutdown(self): |
| 44 | + self._socket.close() |
| 45 | + |
| 46 | + # pylint: disable=no-self-use |
| 47 | + def _parse_endpoint(self, endpoint: str) -> Tuple[str, int]: |
| 48 | + try: |
| 49 | + vals = endpoint.split(":") |
| 50 | + host = vals[0] |
| 51 | + port = int(vals[1]) |
| 52 | + except Exception as exc: # pylint: disable=broad-except |
| 53 | + raise ValueError(f"Invalid endpoint: {endpoint}") from exc |
| 54 | + |
| 55 | + return host, port |
| 56 | + |
| 57 | + |
| 58 | +class OTLPUdpSpanExporter(SpanExporter): |
| 59 | + def __init__(self, endpoint: Optional[str] = None, sampled: bool = True): |
| 60 | + if endpoint is None and "AWS_LAMBDA_FUNCTION_NAME" in os.environ: |
| 61 | + # If in an AWS Lambda Environment, `AWS_XRAY_DAEMON_ADDRESS` will be defined |
| 62 | + endpoint = os.environ.get("AWS_XRAY_DAEMON_ADDRESS", DEFAULT_ENDPOINT) |
| 63 | + |
| 64 | + self._udp_exporter = UdpExporter(endpoint=endpoint) |
| 65 | + self._sampled = sampled |
| 66 | + |
| 67 | + @override |
| 68 | + def export(self, spans: Sequence[ReadableSpan]) -> SpanExportResult: |
| 69 | + serialized_data = encode_spans(spans).SerializeToString() |
| 70 | + |
| 71 | + try: |
| 72 | + prefix = ( |
| 73 | + FORMAT_OTEL_SAMPLED_TRACES_BINARY_PREFIX |
| 74 | + if self._sampled |
| 75 | + else FORMAT_OTEL_UNSAMPLED_TRACES_BINARY_PREFIX |
| 76 | + ) |
| 77 | + self._udp_exporter.send_data(data=serialized_data, signal_format_prefix=prefix) |
| 78 | + return SpanExportResult.SUCCESS |
| 79 | + except Exception as exc: # pylint: disable=broad-except |
| 80 | + _logger.error("Error exporting spans: %s", exc) |
| 81 | + return SpanExportResult.FAILURE |
| 82 | + |
| 83 | + # pylint: disable=no-self-use |
| 84 | + @override |
| 85 | + def force_flush(self, timeout_millis: int = 30000) -> bool: |
| 86 | + # TODO: implement force flush |
| 87 | + return True |
| 88 | + |
| 89 | + @override |
| 90 | + def shutdown(self) -> None: |
| 91 | + self._udp_exporter.shutdown() |
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