SSE: WHATWG Server-Sent Events parser#10
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WHATWG event-stream parser (Event + Parse over io.Reader as iter.Seq2); reconnecting connection deferred. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Summary
Implements the
ssepackage: a WHATWG-conformant Server-Sent Events(text/event-stream) parser that yields events from any
io.Readeras arange-over-func iterator.
What's included
sse.Event—Type(defaults to "message"),Data(multi-line joined with\n, trailing newline trimmed),ID(sticky across events per spec), andRetry.sse.Parse(r io.Reader) iter.Seq2[Event, error]— runs the WHATWGevent-stream interpretation algorithm:
data/event/id/retryfieldsaccumulate and an event dispatches on a blank line. LF and CRLF line endings,
comment lines (
:), one-leading-space stripping, NUL-in-idignoring, andpartial-event-discard at EOF are all handled. The scanner buffer is capped at
1 MiB; an over-long line surfaces
bufio.ErrTooLong, and read errors aredelivered as the iterator's error value.
Behavior changes
None — new package only (
ssewas a placeholder).Deferred (not in this PR)
retryhonoring, andreconnect/backoff. The parser is fully usable on its own; reconnection is a
resilience layer for a follow-up.
Test plan
go build ./...go vet ./...gofmt -l .(clean)go test -race ./...(all packages pass)retry (valid/non-numeric/non-sticky), comments and blank-only input, CRLF,
leading-space stripping, no-colon field line, partial-event discard at EOF,
mid-stream read error, over-long line, and early break.
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