42 lines
1.6 KiB
Go
42 lines
1.6 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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stdio "git.novox.be/novox/mesh-sdk/go"
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"github.com/nats-io/nats.go/jetstream"
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"nats-tools/internal/busconn"
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)
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// LiveBus is the bus as the module's own credential reaches it. Nothing connects until a tool that changes the
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// bus is called, so the tools that read (through the monitoring endpoint) answer as they did with no credential.
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// NATS_TOOLS_CREDENTIAL names the credential (a word of the bundle's own: the runtime strips MESH_BROKER_FILE) (the process nats-tools's own secret `broker-nats-tools`); MESH_NATS_SERVER where the bus is as
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// seen from this machine (default: its own port on loopback).
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func LiveBus() Bus {
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return func(ctx context.Context) (jetstream.JetStream, func(), error) {
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file := env("NATS_TOOLS_CREDENTIAL", "")
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if file == "" {
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return nil, nil, errors.New("NATS_TOOLS_CREDENTIAL is not set, so this tool has no credential to reach the bus with (the module's manifest sets it)")
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}
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c, err := busconn.Read(file)
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if err != nil {
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return nil, nil, fmt.Errorf("the credential at %s (NATS_TOOLS_CREDENTIAL) cannot be read: %w", file, err)
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}
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nc, err := busconn.Connect(env("MESH_NATS_SERVER", "tls://127.0.0.1:4222"), c, "nats-tools")
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if err != nil {
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return nil, nil, err
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}
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js, err := jetstream.New(nc)
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if err != nil {
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nc.Close()
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return nil, nil, fmt.Errorf("JetStream on the bus: %w", err)
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}
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return js, nc.Close, nil
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}
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}
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// SaidByTheRuntime is the audit line: an event of this module, published through the runtime that launched it.
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func SaidByTheRuntime(event string, body any) error { return stdio.Emit(event, body) }
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