|
| 1 | +import base64 |
| 2 | +import json |
| 3 | +from typing import Any, Dict, Iterator, List, Optional |
| 4 | + |
| 5 | +from aws_lambda_powertools.utilities.data_classes.common import DictWrapper |
| 6 | + |
| 7 | + |
| 8 | +class KafkaEventRecord(DictWrapper): |
| 9 | + @property |
| 10 | + def topic(self) -> str: |
| 11 | + """The Kafka topic.""" |
| 12 | + return self["topic"] |
| 13 | + |
| 14 | + @property |
| 15 | + def partition(self) -> str: |
| 16 | + """The Kafka record parition.""" |
| 17 | + return self["partition"] |
| 18 | + |
| 19 | + @property |
| 20 | + def offset(self) -> str: |
| 21 | + """The Kafka record offset.""" |
| 22 | + return self["offset"] |
| 23 | + |
| 24 | + @property |
| 25 | + def timestamp(self) -> int: |
| 26 | + """The Kafka record timestamp.""" |
| 27 | + return self["timestamp"] |
| 28 | + |
| 29 | + @property |
| 30 | + def timestamp_type(self) -> str: |
| 31 | + """The Kafka record timestamp type.""" |
| 32 | + return self["timestampType"] |
| 33 | + |
| 34 | + @property |
| 35 | + def key(self) -> str: |
| 36 | + """The raw (base64 encoded) Kafka record key.""" |
| 37 | + return self["key"] |
| 38 | + |
| 39 | + @property |
| 40 | + def decoded_key(self) -> bytes: |
| 41 | + """Decode the base64 encoded key as bytes.""" |
| 42 | + return base64.b64decode(self.key) |
| 43 | + |
| 44 | + @property |
| 45 | + def value(self) -> str: |
| 46 | + """The raw (base64 encoded) Kafka record value.""" |
| 47 | + return self["value"] |
| 48 | + |
| 49 | + @property |
| 50 | + def decoded_value(self) -> bytes: |
| 51 | + """Decodes the base64 encoded value as bytes.""" |
| 52 | + return base64.b64decode(self.value) |
| 53 | + |
| 54 | + @property |
| 55 | + def json_value(self) -> Any: |
| 56 | + """Decodes the text encoded data as JSON.""" |
| 57 | + if self._json_data is None: |
| 58 | + self._json_data = json.loads(self.decoded_value.decode("utf-8")) |
| 59 | + return self._json_data |
| 60 | + |
| 61 | + @property |
| 62 | + def headers(self) -> List[Dict[str, List[int]]]: |
| 63 | + """The raw Kafka record headers.""" |
| 64 | + return self["headers"] |
| 65 | + |
| 66 | + @property |
| 67 | + def decoded_headers(self) -> Dict[str, bytes]: |
| 68 | + """Decodes the headers as a single dictionary.""" |
| 69 | + return {k: bytes(v) for chunk in self.headers for k, v in chunk.items()} |
| 70 | + |
| 71 | + def get_header_value( |
| 72 | + self, name: str, default_value: Optional[Any] = None, case_sensitive: bool = True |
| 73 | + ) -> Optional[bytes]: |
| 74 | + """Get a decoded header value by name.""" |
| 75 | + if case_sensitive: |
| 76 | + return self.decoded_headers.get(name, default_value) |
| 77 | + name_lower = name.lower() |
| 78 | + |
| 79 | + return next( |
| 80 | + # Iterate over the dict and do a case-insensitive key comparison |
| 81 | + (value for key, value in self.decoded_headers.items() if key.lower() == name_lower), |
| 82 | + # Default value is returned if no matches was found |
| 83 | + default_value, |
| 84 | + ) |
| 85 | + |
| 86 | + |
| 87 | +class KafkaEvent(DictWrapper): |
| 88 | + """Self-managed Apache Kafka event trigger |
| 89 | + Documentation: |
| 90 | + -------------- |
| 91 | + - https://docs.aws.amazon.com/lambda/latest/dg/with-kafka.html |
| 92 | + """ |
| 93 | + |
| 94 | + @property |
| 95 | + def event_source(self) -> str: |
| 96 | + """The AWS service from which the Kafka event record originated.""" |
| 97 | + return self["eventSource"] |
| 98 | + |
| 99 | + @property |
| 100 | + def event_source_arn(self) -> Optional[str]: |
| 101 | + """The AWS service ARN from which the Kafka event record originated.""" |
| 102 | + return self.get("eventSourceArn") |
| 103 | + |
| 104 | + @property |
| 105 | + def bootstrap_servers(self) -> str: |
| 106 | + """The Kafka bootstrap URL.""" |
| 107 | + return self["bootstrapServers"] |
| 108 | + |
| 109 | + @property |
| 110 | + def decoded_bootstrap_servers(self) -> List[str]: |
| 111 | + """The decoded Kafka bootstrap URL.""" |
| 112 | + return self.bootstrap_servers.split(",") |
| 113 | + |
| 114 | + @property |
| 115 | + def records(self) -> Iterator[KafkaEventRecord]: |
| 116 | + """The Kafka records.""" |
| 117 | + for chunk in self["records"].values(): |
| 118 | + for record in chunk: |
| 119 | + yield KafkaEventRecord(record) |
| 120 | + |
| 121 | + @property |
| 122 | + def record(self) -> KafkaEventRecord: |
| 123 | + """The next Kafka record.""" |
| 124 | + return next(self.records) |
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