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chore: configfetcher interface added
Signed-off-by: Mattia Lavacca <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| package configfetcher | ||
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| import ( | ||
| "context" | ||
| "errors" | ||
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| "github.com/kong/deck/dump" | ||
| "github.com/kong/deck/utils" | ||
| "github.com/kong/go-kong/kong" | ||
| "github.com/kong/kubernetes-ingress-controller/v2/internal/adminapi" | ||
| "github.com/kong/kubernetes-ingress-controller/v2/internal/dataplane/kongstate" | ||
| "github.com/kong/kubernetes-ingress-controller/v2/internal/dataplane/sendconfig" | ||
| "github.com/sirupsen/logrus" | ||
| ) | ||
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| type LastValidConfigFetcher interface { | ||
| // TryFetchingValidConfigFromGateways tries to fetch a valid configuration from all gateways and persists it if found. | ||
| TryFetchingValidConfigFromGateways(ctx context.Context, logger logrus.FieldLogger, gatewayClients []*adminapi.Client) error | ||
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| // LastValidConfig returns the last valid config and true if there's one available. Otherwise, second return value is false. | ||
| LastValidConfig() (*kongstate.KongState, bool) | ||
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| // StoreLastValidConfig stores a given configuration as the last valid config. Should be used when the configuration was successfully accepted by a gateway. | ||
| StoreLastValidConfig(s *kongstate.KongState) | ||
| } | ||
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| type DefaultKongLastGoodConfigFetcher struct { | ||
| config dump.Config | ||
| lastValidState *kongstate.KongState | ||
| } | ||
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| func NewDefaultKongLastGoodConfigFetcher() *DefaultKongLastGoodConfigFetcher { | ||
| return &DefaultKongLastGoodConfigFetcher{ | ||
| config: dump.Config{}, | ||
| } | ||
| } | ||
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| func (cf *DefaultKongLastGoodConfigFetcher) LastValidConfig() (*kongstate.KongState, bool) { | ||
| if cf.lastValidState != nil { | ||
| return cf.lastValidState, true | ||
| } | ||
| return nil, false | ||
| } | ||
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| func (cf *DefaultKongLastGoodConfigFetcher) StoreLastValidConfig(s *kongstate.KongState) { | ||
| cf.lastValidState = s | ||
| } | ||
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| func (cf *DefaultKongLastGoodConfigFetcher) TryFetchingValidConfigFromGateways( | ||
| ctx context.Context, | ||
| logger logrus.FieldLogger, | ||
| gatewayClients []*adminapi.Client, | ||
| ) error { | ||
| logger.Debugf("fetching last good configuration from %d gateway clients", len(gatewayClients)) | ||
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| var goodKongState *kongstate.KongState | ||
| var errs error | ||
| for _, client := range gatewayClients { | ||
| rs, err := cf.getKongRawState(ctx, client.AdminAPIClient()) | ||
| if err != nil { | ||
| errs = errors.Join(errs, err) | ||
| } | ||
| ks := KongRawStateToKongState(rs) | ||
| status, err := cf.getKongStatus(ctx, client.AdminAPIClient()) | ||
| if err != nil { | ||
| errs = errors.Join(errs, err) | ||
| } | ||
| if status.ConfigurationHash != sendconfig.WellKnownInitialHash { | ||
| // Get the first good one as the one to be used. | ||
| goodKongState = ks | ||
| break | ||
| } | ||
| } | ||
| if goodKongState != nil { | ||
| cf.lastValidState = goodKongState | ||
| logger.Debug("last good configuration fetched from a Kong node") | ||
| } | ||
| return errs | ||
| } | ||
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| func (cf *DefaultKongLastGoodConfigFetcher) getKongRawState(ctx context.Context, client *kong.Client) (*utils.KongRawState, error) { | ||
| return dump.Get(ctx, client, cf.config) | ||
| } | ||
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| func (cf *DefaultKongLastGoodConfigFetcher) getKongStatus(ctx context.Context, client *kong.Client) (*kong.Status, error) { | ||
| return client.Status(ctx) | ||
| } |
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