jschoubben
1ff5049d03
Since release 6 nobody publishes memberships, so a module placed since cannot serve its seat or reach a new state (the operator, 2026-10-25 22:31). The part publishes each membership on the assignments stream only when it differs from the one last published, composes from the manifest the wanted build names, and says a refused publish and tries again at the next event. Pins mesh-sdk 881da7f, whose composer grants mesh-grants that publish.
56 lines
1.9 KiB
Go
56 lines
1.9 KiB
Go
package main
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import (
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"context"
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"errors"
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"fmt"
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"strconv"
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"github.com/nats-io/nats.go"
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"github.com/nats-io/nats.go/jetstream"
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"git.novox.be/novox/mesh-sdk/go/membership"
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)
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// memberships publishes each membership on the assignments stream, last per subject, over the one last read there
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// (ExpectLastSequencePerSubject, so a membership another writer published meanwhile is not overwritten, issues 930 and
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// 934), and reads the last one by a direct get of its subject. The one place the part publishes on the bus.
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type memberships struct {
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ctx context.Context
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nc *nats.Conn
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js jetstream.JetStream
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}
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func (m memberships) LastMembership(node, module string) ([]byte, uint64, bool, error) {
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ctx, cancel := context.WithTimeout(m.ctx, requestWithin)
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defer cancel()
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msg, err := m.nc.RequestWithContext(ctx, membership.DirectGetSubject(node, module), nil)
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if err != nil {
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if errors.Is(err, context.DeadlineExceeded) {
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err = fmt.Errorf("no answer in %s: a read the bus refuses is answered by none (%w)", requestWithin, err)
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}
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return nil, 0, false, err
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}
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switch status := msg.Header.Get("Status"); status {
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case "":
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case "404":
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return nil, 0, false, nil
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default:
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return nil, 0, false, fmt.Errorf("the assignments stream answered %s %s", status, msg.Header.Get("Description"))
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}
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seq, err := strconv.ParseUint(msg.Header.Get("Nats-Sequence"), 10, 64)
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if err != nil {
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return nil, 0, false, fmt.Errorf("the membership of %s on %s carries no sequence", module, node)
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}
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return msg.Data, seq, true, nil
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}
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func (m memberships) PublishMembership(node, module string, body []byte, after uint64) error {
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ctx, cancel := context.WithTimeout(m.ctx, requestWithin)
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defer cancel()
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if _, err := m.js.Publish(ctx, membership.Subject(node, module), body, jetstream.WithExpectLastSequencePerSubject(after)); err != nil {
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return fmt.Errorf("the membership of %s on %s after sequence %d: %w", module, node, after, err)
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}
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return nil
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}
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