Eric Rakestraw
6c5f95ad26
- Introduce explicit source interfaces: sources.PollSource and sources.StreamSource, with shared sources.Input (Name() only). - Remove mandatory Kind() from the base source contract to support sources that emit multiple kinds. - Add config.SourceMode (poll, stream, or omitted/auto) and SourceConfig.Kinds (plural expected kinds), while keeping legacy SourceConfig.Kind for compatibility. - Enforce mode semantics in config validation (poll requires every, stream forbids every) and detect mode/driver mismatches in sources.Registry. - Update docs and tests for the new source model and config behavior.
109 lines
3.1 KiB
Go
109 lines
3.1 KiB
Go
// Package feedkit provides domain-agnostic plumbing for feed-processing daemons.
|
|
//
|
|
// A feed daemon ingests upstream input, turns it into event.Event values, applies
|
|
// optional processing, and emits to sinks.
|
|
//
|
|
// Conceptual flow:
|
|
//
|
|
// Collect -> Normalize (optional) -> Policy -> Route -> Emit
|
|
//
|
|
// In feedkit this maps to:
|
|
//
|
|
// Collect: sources + scheduler
|
|
// Normalize: normalize (optional pipeline stage)
|
|
// Policy: pipeline
|
|
// Route: dispatch
|
|
// Emit: sinks
|
|
// Config: config
|
|
//
|
|
// feedkit intentionally does not define domain payload schemas or domain-specific
|
|
// validation rules. Those belong in each concrete daemon.
|
|
//
|
|
// Public packages
|
|
//
|
|
// - config
|
|
// YAML config loading/validation (strict decode + domain-agnostic checks).
|
|
//
|
|
// SourceConfig supports both polling and streaming sources:
|
|
//
|
|
// - mode: "poll" | "stream" | omitted (auto by driver type)
|
|
//
|
|
// - every: poll interval (required for mode="poll")
|
|
//
|
|
// - kinds: optional expected emitted kinds
|
|
//
|
|
// - kind: legacy singular fallback
|
|
//
|
|
// - params: driver-specific settings
|
|
//
|
|
// - event
|
|
// Domain-agnostic event envelope (ID, Kind, Source, EmittedAt, Schema, Payload).
|
|
//
|
|
// - sources
|
|
// Source abstractions and source-driver registry.
|
|
//
|
|
// There are two source interfaces:
|
|
//
|
|
// - PollSource: Poll(ctx) ([]event.Event, error)
|
|
//
|
|
// - StreamSource: Run(ctx, out) error
|
|
//
|
|
// Both share Input{Name()}. A source may emit 0..N events per poll/run step,
|
|
// and may emit multiple event kinds.
|
|
//
|
|
// - scheduler
|
|
// Runs one goroutine per job:
|
|
//
|
|
// - PollSource jobs run on Every (+ jitter)
|
|
//
|
|
// - StreamSource jobs run continuously
|
|
//
|
|
// - pipeline
|
|
// Processor chain between scheduler and dispatch.
|
|
// Processors can transform, drop, or reject events.
|
|
//
|
|
// - normalize
|
|
// Optional pipeline processor for raw->canonical mapping.
|
|
// If no normalizer matches, the event passes through unchanged by default.
|
|
//
|
|
// - dispatch
|
|
// Routes events to sinks and isolates slow sinks via per-sink queues/workers.
|
|
//
|
|
// - sinks
|
|
// Sink abstractions + sink registry.
|
|
//
|
|
// Typical wiring (daemon main.go)
|
|
//
|
|
// 1. Load config.
|
|
// 2. Register source drivers and build sources from config.Sources.
|
|
// 3. Register sink drivers and build sinks from config.Sinks.
|
|
// 4. Compile routes.
|
|
// 5. Start scheduler (sources -> bus) and dispatcher (bus -> pipeline -> sinks).
|
|
//
|
|
// Sketch:
|
|
//
|
|
// cfg, _ := config.Load("config.yml")
|
|
// srcReg := sources.NewRegistry()
|
|
// // domain registers poll/stream drivers...
|
|
//
|
|
// var jobs []scheduler.Job
|
|
// for _, sc := range cfg.Sources {
|
|
// src, _ := srcReg.BuildInput(sc)
|
|
// jobs = append(jobs, scheduler.Job{
|
|
// Source: src,
|
|
// Every: sc.Every.Duration,
|
|
// })
|
|
// }
|
|
//
|
|
// bus := make(chan event.Event, 256)
|
|
// s := &scheduler.Scheduler{Jobs: jobs, Out: bus, Logf: logf}
|
|
// // start dispatcher similarly...
|
|
//
|
|
// # Context and cancellation
|
|
//
|
|
// All blocking work should honor context cancellation:
|
|
// - source polling/streaming I/O
|
|
// - sink consumption
|
|
// - any expensive processor work
|
|
package feedkit
|