Backport of NET-5049: subscribe to bound-api-gateway only after receiving api-gateway into release/1.16.x (#18295)
* backport of commit 972b20aee7c764217d8772502856aca5333c59c1 * backport of commit 275681714280e27228a1f9f5ce68c1b1ddb3c33e * backport of commit 72c8f1e4db8c8204a71d0c85b6f9900c231c495a --------- Co-authored-by: Nathan Coleman <nathan.coleman@hashicorp.com>
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@ -0,0 +1,3 @@
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```release-note:bug
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api-gateway: fix race condition in proxy config generation when Consul is notified of the bound-api-gateway config entry before it is notified of the api-gateway config entry.
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```
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@ -54,12 +54,6 @@ func (h *handlerAPIGateway) initialize(ctx context.Context) (ConfigSnapshot, err
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return snap, err
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}
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// Watch the bound-api-gateway's config entry
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err = h.subscribeToConfigEntry(ctx, structs.BoundAPIGateway, h.service, h.proxyID.EnterpriseMeta, boundGatewayConfigWatchID)
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if err != nil {
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return snap, err
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}
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snap.APIGateway.Listeners = make(map[string]structs.APIGatewayListener)
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snap.APIGateway.BoundListeners = make(map[string]structs.BoundAPIGatewayListener)
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snap.APIGateway.HTTPRoutes = watch.NewMap[structs.ResourceReference, *structs.HTTPRouteConfigEntry]()
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@ -143,10 +137,12 @@ func (h *handlerAPIGateway) handleRootCAUpdate(u UpdateEvent, snap *ConfigSnapsh
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return nil
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}
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// handleGatewayConfigUpdate responds to changes in the watched config entry for a gateway.
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// In particular, we want to make sure that we're subscribing to any attached resources such
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// as routes and certificates. These additional subscriptions will enable us to update the
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// config snapshot appropriately for any route or certificate changes.
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// handleGatewayConfigUpdate responds to changes in the watched config entries for a gateway.
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// Once the base api-gateway config entry has been seen, we store the list of listeners and
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// then subscribe to the corresponding bound-api-gateway config entry. We use the bound-api-gateway
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// config entry to subscribe to any attached resources, including routes and certificates.
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// These additional subscriptions will enable us to update the config snapshot appropriately
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// for any route or certificate changes.
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func (h *handlerAPIGateway) handleGatewayConfigUpdate(ctx context.Context, u UpdateEvent, snap *ConfigSnapshot, correlationID string) error {
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resp, ok := u.Result.(*structs.ConfigEntryResponse)
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if !ok {
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@ -244,6 +240,12 @@ func (h *handlerAPIGateway) handleGatewayConfigUpdate(ctx context.Context, u Upd
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}
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snap.APIGateway.GatewayConfigLoaded = true
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// Watch the corresponding bound-api-gateway config entry
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err := h.subscribeToConfigEntry(ctx, structs.BoundAPIGateway, h.service, h.proxyID.EnterpriseMeta, boundGatewayConfigWatchID)
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if err != nil {
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return err
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}
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break
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default:
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return fmt.Errorf("invalid type for config entry: %T", resp.Entry)
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