fabric

Milestones

Note: These milestones are maintained in separate branches in order to demonstrate the thinking process behind the building of this framework. Milestone are not releases and they are not production-ready.

Milestone 1:

• Connector construct, including startup and shutdown logic
• Config from environment or file
• Rudimentary logger
• Bi-directional (request/response) HTTP-like unicast messaging over NATS
• HTTP ingress proxy

Milestone 2:

• Error capture and propagation
• Time budget for requests

Milestone 3:

• Application construct to group microservices
• NATS connection settings
• Deployment environment indicator (PROD, LAB, LOCAL)
• Plane of communication

Milestone 4:

• Acks and quick timeouts
• Bi-directional (request/response) HTTP-like multicast messaging over NATS
• Direct addressing
• Control messages on port :888

Milestone 5:

• Advanced logger with JSON output

Milestone 6:

• Fragmentation of large messages
• Optimized HTTP utilities (BodyReader and ResponseRecorder)

Milestone 7:

• Tickers
• Mockable clock (deprecated in milestone 19)
• Context for the Lifetime of the microservice
• Customizable time budget for callbacks (deprecated in milestone 19)
• Drain pending operations during shutdown

Milestone 8:

• Configurator microservice to centralize the dissemination of configuration values to other microservices
• Config property definition with value validation
• Connector description
• Update of NATS connection environment variable names
• Update of deployment and plane environment variable names

Milestone 9:

• LRU cache
• Distributed LRU cache

Milestone 10:

• Code generation tool
• Code generation to bootstrap new microservices
• Code generation of config definitions and accessors
• Code generation of web handlers
• Code generation of functional handlers (JSON over HTTP)
• Code generation of tickers
• Code generation of complex types
• Code change detection and automatic microservice versioning
• Embedded resources
• Clients for the port :888 control subscriptions
• Code generator automatically adding errors.Trace to returned errors
• Capturing errors during initialization and failing startup

Milestone 11:

• Code generation of event sources
• Code generation of event sinks
• Use InfiniteChans to avoid blocking messaging channels in high-load situations (deprecated in milestone 23)

Milestone 12:

• Improvements to how the Application manages the lifecycle of microservices
• Code generation of an integration test harness
• Code generation of a mockable stub for microservices
• Restarting of microservices that were previously shutdown
• TESTING deployment environment in which tickers and the configurator are disabled
• Integration tests for the example microservices

Milestone 13:

• Sharded MySQL database (deprecated in milestone 21)
• Sharding key allocation management
• Differential schema migration
• Code generation of MySQL boilerplate code
• Allow attaching multiple lifecycle and config change callbacks to the Connector
• NullTime utility to better handle serialization of the zero time value

Milestone 14:

• Extended TracedError with HTTP status code
• Handle CORS preflight and origin
• HTTP ingress protections: memory usage limit, read timeout, read header timeout, write timeout
• Compress if seeing Accept-Encoding header
• Handle X-Forwarded headers
• TLS in HTTP ingress
• Multiple HTTP ports for HTTP ingress, with mapping for internal ports

Milestone 15:

• Support in Connector for collecting system metrics
• Metrics core microservice that collects and delivers metrics to Prometheus and Grafana
• Code generation for solution-specific metrics
• Quick start with Docker Compose

Milestone 16:

• License and copyright notices
• MariaDB database support (deprecated in milestone 21)
• HTTP ingress middleware

Milestone 17:

• Code generation of tests for event sources
• any error annotation types instead of string
• rand.Read
• Do not return an error if a multicast returns zero responses
• HTTP ingress proxy to respect Request-Timeout header
• Capture full stack trace during panics
• Reset ack timeout during debugging
• Fixed bug in conveying the time budget downstream
• Fixed bug in conveying baggage and X-Forwarded headers downstream
• Brotli compression by HTTP ingress proxy
• HTTP ingress proxy to bypass the middleware when contacting the metrics microservice
• HTTP ingress proxy to transform / requests to /root
• Deprecated the need to define types in service.yaml
• Simplified distributed stack trace
• Ignore debug level log message unless MICROBUS_LOG_DEBUG is set
• Blocking paths in the ingress proxy
• Inbox microservice (renamed in milestone 26)
• Introduced Go in Connector to run goroutines safely in the context of the microservice
• HTTP ingress proxy adds X-Forwarded-Path header

Milestone 18:

• Handle service resources natively in the Connector rather than in the code generation layer
• Enable initializing the Connector with a custom fs.FS
• ServerLanguages configuration in the HTTP Ingress microservice determines the best language to display to the user based on the Accept-Language request header
• LoadResString in Connector loads a string from the strings.yaml resource file localized to the language of the request
• Introduced Parallel in Connector to run multiple jobs in parallel
• Startup Groups instead of Connector startup sequence

Milestone 19:

• Distributed tracing with OpenTelemetry and Jaeger
• Deprecated the concept of the time budget for callbacks and removed the cb package
• Deprecated the concept of the mockable clock and removed the clock package
• Introduced clock shifting via the ctx and adjusted connector.Now to accept a ctx

Milestone 20:

• Code generation of OpenAPI endpoints for microservices at openapi.json
• OpenAPI portal core microservice to aggregate and display links to all microservices with an OpenAPI
• Subscriptions to specific HTTP methods
• Subscriptions to any port using an :* in the path

Milestone 21:

• HTTP egress core microservice
• Added browser example to demonstrate use of HTTP egress
• Deprecate BatchLookup in the shardedsql package
• Block all requests to internal port :888 in ingress proxy
• Improve performance in rand package
• Renamed the services package to coreservices
• Replaced the Service interface in the connector package with various interfaces in a new service package
• Adjusted the pattern of including microservices in an Application
• Deprecated the SQL database dependency and its corresponding code generation
• Handling of errors.Join
• Deprecated error annotations
• Auto-detect TESTING deployment based on call stack
• Distributed tracing improvements

Milestone 22:

• Create type-safe setter functions for each config property
• Refactor the interface exposed by the client for web endpoints
• New test case asserters, mostly for web endpoints
• Simulate a database in memory for the directory example if MariaDB is not available
• Support multi-value headers in requests and responses

Milestone 23:

• Bug fixes and resiliency improvements
• Hello example microservice to handle the topmost root path
• Deprecated InfiniteChan and replaced with an internal transferChan
• Middleware chain inside HTTP ingress proxy instead of delegating to a remote microservice
• Enhancements to distributed tracing and metric collection

Milestone 24:

• Use port :0 to subscribe to any port instead of :*
• Use method ANY to subscribe to any method instead of *
• Path arguments {arg} and {greedy+}
• httpRequestBody and httpResponseBody magic arguments in functions
• Changed the directory example to RESTful API style
• Introduced a microservice for testing of the code generator
• Deprecated variadic options in code-generated clients

Milestone 25:

• Documentation

Milestone 26:

• Locality-aware routing given a MICROBUS_LOCALITY environment variable
• Determine locality automatically from availability zone name in AWS or GCP
• Renamed the inbox core microservice to SMTP ingress
• Changed hostname suffix of core microservices to .core
• New pattern for adding and removing microservices in an Application

Milestone 27:

• Removed dependency on Testify

Milestone 28:

• Removed dependency on Zap logger and replace with standard slog

Milestone 29:

• Documentation
• Fixed data race in metrics collection
• Added connector.StopTicker
• Fixed deadlock when running tickers
• Refactored custom rand package to use math/rand/v2
• No locality-aware routing when directly targeting a microservice by ID

Milestone 30:

• Adjusted interface of middleware
• Refactored the HTTP ingress proxy as a customizable chain of middleware
• Moved utils.CatchPanic to errors.CatchPanic

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