jschoubben
5fa64be894
Main reverted G's half merge (#189, reverted by8afc3ebin #191) and then took the reader release's S1-S5, which copied G's code. G's form holds where they differ (process_bus.go, seats.go, state.go and their tests); the release's kept names stay so main's callers keep building: SeatViewPrefix beside SeatReadPrefix, and QueueInvoke's empty strings on not-ok (with its test TestQueueInvoke). The tree differs from G's headf30dee54only by those and the release's two tests (objects cap option, seat states and stream kinds). Builds: design 47 G (the milestone's sdk part, as atf30dee54) Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h
73 lines
2.7 KiB
Go
73 lines
2.7 KiB
Go
package buscalls
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import (
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"bytes"
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"encoding/json"
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"errors"
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"strings"
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"testing"
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)
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// TestSeatChunksReceive: the chunks of a send are written in order and each acknowledged before the next; a missed,
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// misplaced or miscounted chunk ends the receive unacknowledged (design 47 G §681, A-139).
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func TestSeatChunksReceive(t *testing.T) {
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c := SeatChunks{Seat: "mesh-broker", Verb: "snapshot-get", Call: "0123456789abcdef0123456789abcdef"}
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if c.Chunk(2) != "mesh.seat.mesh-broker.chunk.snapshot-get.0123456789abcdef0123456789abcdef.2" ||
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c.Ack(2) != "mesh.seat.mesh-broker.ack.snapshot-get.0123456789abcdef0123456789abcdef.2" ||
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c.Chunks() != "mesh.seat.mesh-broker.chunk.snapshot-get.0123456789abcdef0123456789abcdef.*" ||
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SeatAcks("mesh-broker", "snapshot-get") != "mesh.seat.mesh-broker.ack.snapshot-get.*.*" {
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t.Fatalf("subjects: %s %s %s", c.Chunk(2), c.Ack(2), c.Chunks())
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}
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type sent struct {
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subject string
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body SeatChunk
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missed bool
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}
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good := []sent{{subject: c.Chunk(1), body: SeatChunk{N: 1, Of: 3, Data: []byte("ab")}},
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{subject: c.Chunk(2), body: SeatChunk{N: 2, Of: 3, Data: []byte("cd")}},
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{subject: c.Chunk(3), body: SeatChunk{N: 3, Of: 3, Data: []byte("e")}}}
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for _, tc := range []struct {
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name string
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sends []sent
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want string
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acks int
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err string
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}{
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{name: "three chunks", sends: good, want: "abcde", acks: 3},
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{name: "a missed chunk", sends: append(good[:1:1], sent{missed: true}), want: "ab", acks: 1, err: "chunk 2 of 3"},
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{name: "out of order", sends: []sent{good[1]}, acks: 0, err: "came on"},
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{name: "another count", sends: []sent{{subject: c.Chunk(1), body: SeatChunk{N: 1, Of: 2, Data: []byte("x")}}}, err: "says it is 1 of 2"},
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} {
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t.Run(tc.name, func(t *testing.T) {
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i, acks := 0, 0
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next := func() (string, []byte, error) {
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if i >= len(tc.sends) || tc.sends[i].missed {
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return "", nil, ErrSeatChunkMissed
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}
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s := tc.sends[i]
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i++
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body, _ := json.Marshal(s.body)
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return s.subject, body, nil
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}
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ack := func(subject string) error {
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acks++
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if subject != c.Ack(int64(acks)) {
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t.Fatalf("ack %d on %s", acks, subject)
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}
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return nil
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}
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var out bytes.Buffer
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n, err := c.Receive(3, next, ack, &out)
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if tc.err == "" && err != nil || tc.err != "" && (err == nil || !strings.Contains(err.Error(), tc.err)) {
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t.Fatalf("err %v, want %q", err, tc.err)
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}
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if tc.name == "a missed chunk" && !errors.Is(err, ErrSeatChunkMissed) {
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t.Fatalf("a missed chunk is not ErrSeatChunkMissed: %v", err)
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}
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if out.String() != tc.want || n != int64(len(tc.want)) || acks != tc.acks {
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t.Fatalf("wrote %q (%d), %d acks; want %q, %d acks", out.String(), n, acks, tc.want, tc.acks)
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}
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})
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}
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}
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