jschoubben
499ff5c218
mesh/delivery-group group feat/r4d rejected: a member's own check failed
mesh/repo-check out of date: judged beside mesh-catalog#434 at c948f3a61c74, it is now at 7451e7edf4e5; judged again on a recheck or when it is merged
mesh/merge-gate group feat/r4d: composed again for the group's new heads
mesh/delivery superseded: a newer head of the same pull request
mesh/check failed: unit: i3/cmd/i3-tools.TestTheMainFileAndEveryModulesContributionLoadTogether: manifest_test.go:247: expected the launcher, clipboar…
A bundle is built only from its module's directory (ADR 0480 clause 4), so the proxy leaves examples/ and the controller's internal/broker; the broker keeps no second copy of what the proxy shares with mesh-sdk. The image and its Dockerfile go, and a test holds that only build-agent declares one (clause 11).
51 lines
1.8 KiB
Go
51 lines
1.8 KiB
Go
package broker
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import (
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"fmt"
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"strings"
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"github.com/novox/mesh-controller/internal/envfile"
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)
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// Whether this mesh's own traffic is on the bus being built.
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//
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// **One switch, read in one place** (novox/hq ADR 0116 step 5). Every seam the bus change went
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// behind ships both implementations, and until the rollout every one of them chooses the bus the
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// mesh runs on today. This is what the rollout flips, and it is deliberately a single fact rather
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// than a fact per component: a controller whose outbound is on one bus and whose inbound is on the
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// other is a mesh that hears nothing, and no test of either half would catch it.
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// NATSVar is where the controller finds the bus being built. Unset is the ordinary case and means
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// the mesh runs on the bus it has always run on.
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const NATSVar = "MESH_BUS_NATS"
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// OnNATS is the address of the bus being built, and whether the mesh is on it.
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//
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// Read from the node's own settings rather than baked in, for the reason the broker's address is
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// (novox/hq 04-ISSUES/102): an address recorded once does not follow a node's ports.
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func OnNATS() (address string, on bool, err error) {
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address, err = envfile.Placed(NATSVar)
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if err != nil {
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return "", false, err
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}
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address = strings.TrimSpace(address)
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if address == "" {
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return "", false, nil
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}
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return address, true, nil
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}
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// BusAddress is where the mesh's bus is, with this process's credential, and refuses to be empty:
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// there is one bus, and a control plane without it can hold records and answer nothing (novox/hq
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// ADR 0131, design 28 task 5.5).
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func BusAddress() (string, error) {
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address, _, err := OnNATS()
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if err != nil {
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return "", err
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}
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if address == "" {
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return "", fmt.Errorf("this control plane has no %s, so it cannot reach the mesh's bus", NATSVar)
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}
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return address, nil
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}
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