cloudevents/spec

Features

• CloudEvents Formats - Defines the core CloudEvents standard structure and attributes for interoperable event data exchange.
• CloudEvents Implementations - Defines the open specification for describing event data in a common format across cloud platforms.
• Event - Encodes events in JSON, Avro, and Protobuf formats with structured, binary, and batched content modes.
• Binary-to-JSON Converters - Deserializes Base64-encoded JSON members back into binary runtime data for event payloads.
• Webhook Delivery - Delivers events to pre-registered HTTP endpoints for push-based event distribution between services.
• CloudEvents Mappings - Specifies how to map CloudEvents to MQTT PUBLISH messages for transport over MQTT 3.1.1 and 5.0.
• Type Mappings - Defines the type mapping table for serializing CloudEvents attributes into Avro primitives.
• Payload Serialization - Converts event data into JSON values or encoded strings based on declared content type.
• Event Composition Tools - Provides the core capability to construct and validate CloudEvent objects against the specification.
• Protobuf Serialization - Maps CloudEvents attributes and data payloads to protobuf types and message structures.
• Event Batchings - Groups multiple CloudEvent protobuf messages into a single repeated field for bulk transport.
• Event Data Payloads - Supports string, binary, and protobuf message payloads within a CloudEvent envelope.
• Event Content Modes - Defines content modes for encoding events over transport protocols, a core part of the specification.
• Context Attribute Routers - Defines how to use standardized context attributes for filtering and routing events by type or source.
• Event Batchings - Groups multiple CloudEvents into a single JSON array for efficient batch transmission.
• Payload Encoders - Serializes binary event data as Base64-encoded JSON strings with preserved content type.
• Event Sequence Tracing - Defines metadata extensions that correlate individual events into sequences for end-to-end tracing.
• Event Correlation and Sequencing - Provides standardized metadata attributes for event correlation and sequencing across distributed systems.
• CloudEvents Formats - Provides a consistent event structure for webhook publishing and consumption across services.
• CloudEvents Bindings - Defines the standard transport bindings for mapping CloudEvents onto HTTP and other protocols.
• Kafka Event Publishing - Specifies how to map CloudEvents to Kafka messages using structured or binary content modes.
• Event Transport Encoders - Defines how to convert canonical CloudEvents into transport-specific messages for delivery.
• Standardized Event Webhook Delivery - Delivers standardized events to registered HTTP endpoints with subscription management and authorization.
• Multi-Protocol Event Transport - Maps events onto various transport protocols including HTTP, AMQP, Kafka, MQTT, NATS, and WebSockets.
• JSON Serialization - Maps CloudEvents attributes to JSON properties using a defined type system for serialization.
• Type-Safe JSON Codecs - Reconstructs CloudEvents from JSON by interpreting typed attributes and payloads per content type rules.
• CloudEvents Extensions - Defines well-known optional extension attributes for CloudEvents to support sampling, partitioning, and sequence tracking.
• JSON Deserializers - Decodes event data from JSON, interpreting Base64 binary and encoded strings per content type.
• Standardized Event-Driven Development - Enables building event-driven systems with a standard event format that decouples producers from consumers.
• Event Normalization - Defines a common set of metadata attributes to normalize events from diverse sources into a standard format.
• Structured JSON Loggers - Deserializes event data from JSON values or encoded strings based on declared content type.
• Event Type Subscriptions - Defines how consumers register interest in specific event types and receive matching events.
• Multi-Format Event Serialization - Provides a protocol-agnostic serialization framework for mapping events to JSON, Avro, and Protobuf.
• Event Schema Validators - Defines validation rules for checking events against specification version and attribute requirements.
• Custom Event Extension Attributes - Provides a mechanism to add custom metadata attributes to CloudEvents without breaking interoperability.
• Transport Message Decoders - Defines how to parse transport-specific messages back into canonical CloudEvent objects.
• Event Payload Unpackers - Defines how to extract event payloads from base64, structured, or wire formats into native representations.
• Event Extension Attributes - Provides an extension attribute mechanism for adding optional metadata to events without breaking interoperability.
• JSON Encoding - Stores binary event data as Base64-encoded JSON strings alongside content type metadata.
• CloudEvents Metadatas - Defines the standard metadata attributes for CloudEvents to enable cross-service event exchange.
• Event Extension - Defines well-known optional attributes for extending event metadata without breaking interoperability.
• Partition Key Assignments - Specifies how to assign Kafka record keys from CloudEvent attributes for partitioning and ordering.
• Event Adapters - Provides an adapter that converts CouchDB change feed events into the standard CloudEvents format for unified processing.
• CloudEvents Versionings - Specifies how to use type and dataschema attributes to evolve CloudEvents schemas.
• Avro CloudEvent Record Encoders - Defines how to serialize CloudEvents into Avro records with a prescribed schema.
• Avro Event Data Serializers - Defines how to serialize CloudEvents data into Avro binary or JSON representations.
• CloudEvents SQL Dialects - Defines a dedicated SQL dialect for filtering and processing CloudEvents streams.
• Stream Event Deduplications - Uses unique identifiers per event source so consumers can recognize and ignore repeated deliveries of the same event.
• Avro Nullable Attribute Definitions - Defines how to mark optional CloudEvents attributes as nullable in Avro schemas.
• Avro Nullable Union Definitions - Defines how to mark optional CloudEvent fields as nullable in Avro using union types.
• Event Adapters - Provides an adapter that converts GitHub webhook events into the standard CloudEvents format for unified processing.
• AWS SNS - Provides an adapter that converts AWS SNS notifications into the standard CloudEvents format for unified processing.
• Event Format Adaptations - Converts popular event formats into the standard CloudEvents specification to ease adoption across systems.
• GitLab - Provides an adapter that converts GitLab webhook events into the standard CloudEvents format for unified processing.
• Serverless Function Portability - Decouples serverless function code from provider-specific event formats to reduce vendor lock-in.
• CloudEvents Correlations - Provides standardized metadata attributes for correlating events across different sources in a workflow.
• Event Adapters - Provides an adapter that converts AWS S3 events into the standard CloudEvents format for unified processing.
• Message Serializations - Specifies how to serialize CloudEvents into NATS message headers and payload for transmission.
• Delivery Consent Handshakes - Defines an OPTIONS handshake for confirming delivery target consent and rate negotiation.
• CloudEvents Streams - Specifies how to establish WebSocket streams for sending and receiving CloudEvents.
• CloudEvents Integrations - Carries distributed tracing correlation identifiers within CloudEvents metadata to link events to traces.
• Header Mappings - Specifies how to map CloudEvents attributes to NATS message headers for transmission.
• CloudEvents Bindings - Specifies how to serialize and transmit CloudEvents over proprietary transport protocols.
• Event Transport Binding Templates - Provides a transport binding specification pattern for mapping events to any protocol.
• Record Key Mappings - Specifies how to assign Kafka record keys from CloudEvent attributes for partitioning and routing.
• Token-based Authorization - Requires bearer token authorization in the Authorization header for each event delivery request.
• Event Security Layering - Layers existing encryption and signing technologies onto events for secure transport without inventing new protocols.
• Event Sequence Numberers - Defines how to number events within partitions for gap, duplicate, and ordering detection.
• Batched Event Content Mode for HTTP - Combines multiple events into a single HTTP request or response body for efficient transport.
• CloudEvents Samplings - Provides metadata to mark events as part of a sampling strategy for filtering or weighting.
• CloudEvents Media Type Identifiers - Defines media types like application/cloudevents+avro to signal CloudEvent format encoding.
• Event Nestings - Specifies how to embed one CloudEvent as the data payload of another CloudEvent.
• Event Partition Key Assigners - Defines how to assign partition keys to events for ordered processing within partitions.
• Avro Optional Field Definitions - Defines how to represent optional CloudEvents fields using Avro union types with null.
• Binary Event Content Mode for AMQP - Places event data as-is in the AMQP data section and maps attributes to application-properties.
• Binary Event Content Mode for HTTP - Places event data directly in the HTTP body and maps attributes to HTTP headers for efficient transfer.
• Subprotocol Negotiation - Specifies how to negotiate a CloudEvents subprotocol during the WebSocket handshake for serialization format agreement.
• Serverless Platforms - Specification for event data.

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