Documentation
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Index ¶
- type ACLResolver
- type Deps
- type LocalBackend
- type LocalMaterializer
- type LocalMaterializerDeps
- type Materializer
- type MockACLResolver
- type RPCMaterializer
- type Request
- type Result
- type Store
- func (s *Store) Get(ctx context.Context, req Request) (Result, error)
- func (s *Store) Notify(ctx context.Context, req Request, correlationID string, ...) error
- func (s *Store) NotifyCallback(ctx context.Context, req Request, correlationID string, cb cache.Callback) error
- func (s *Store) Run(ctx context.Context)
- type StreamClient
- type View
Constants ¶
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Variables ¶
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Functions ¶
This section is empty.
Types ¶
type ACLResolver ¶ added in v1.13.0
type ACLResolver interface {
ResolveTokenAndDefaultMeta(token string, entMeta *acl.EnterpriseMeta, authzContext *acl.AuthorizerContext) (resolver.Result, error)
}
type Deps ¶
type Deps struct {
View View
Logger hclog.Logger
Waiter *retry.Waiter
Request func(index uint64) *pbsubscribe.SubscribeRequest
}
type LocalBackend ¶ added in v1.13.0
type LocalBackend interface {
Subscribe(req *stream.SubscribeRequest) (*stream.Subscription, error)
}
type LocalMaterializer ¶ added in v1.13.0
type LocalMaterializer struct {
// contains filtered or unexported fields
}
LocalMaterializer is a materializer for a stream of events and manages the local subscription to the event publisher until the cache result is discarded when its TTL expires.
func NewLocalMaterializer ¶ added in v1.13.0
func NewLocalMaterializer(deps LocalMaterializerDeps) *LocalMaterializer
func (*LocalMaterializer) Run ¶ added in v1.13.0
func (m *LocalMaterializer) Run(ctx context.Context)
Run receives events from a local subscription backend and sends them to the View. It runs until ctx is cancelled, so it is expected to be run in a goroutine. Mirrors implementation of RPCMaterializer.
Run implements Materializer
type LocalMaterializerDeps ¶ added in v1.13.0
type LocalMaterializerDeps struct {
Deps
Backend LocalBackend
ACLResolver ACLResolver
}
type Materializer ¶
type Materializer interface {
Run(ctx context.Context)
Query(ctx context.Context, minIndex uint64) (Result, error)
}
A Materializer maintains a materialized view of a subscription on an event stream.
type MockACLResolver ¶ added in v1.13.0
MockACLResolver is an autogenerated mock type for the ACLResolver type
func NewMockACLResolver ¶ added in v1.13.0
func NewMockACLResolver(t mockConstructorTestingTNewMockACLResolver) *MockACLResolver
NewMockACLResolver creates a new instance of MockACLResolver. It also registers a testing interface on the mock and a cleanup function to assert the mocks expectations.
func (*MockACLResolver) ResolveTokenAndDefaultMeta ¶ added in v1.13.0
func (_m *MockACLResolver) ResolveTokenAndDefaultMeta(token string, entMeta *acl.EnterpriseMeta, authzContext *acl.AuthorizerContext) (resolver.Result, error)
ResolveTokenAndDefaultMeta provides a mock function with given fields: token, entMeta, authzContext
type RPCMaterializer ¶ added in v1.13.0
type RPCMaterializer struct {
// contains filtered or unexported fields
}
RPCMaterializer is a materializer for a streaming cache type and manages the actual streaming RPC call to the servers behind the scenes until the cache result is discarded when its TTL expires.
func NewRPCMaterializer ¶ added in v1.13.0
func NewRPCMaterializer(client StreamClient, deps Deps) *RPCMaterializer
NewRPCMaterializer returns a new Materializer. Run must be called to start it.
func (*RPCMaterializer) Run ¶ added in v1.13.0
func (m *RPCMaterializer) Run(ctx context.Context)
Run receives events from the StreamClient and sends them to the View. It runs until ctx is cancelled, so it is expected to be run in a goroutine. Mirrors implementation of LocalMaterializer
Run implements Materializer
type Request ¶ added in v1.10.0
type Request interface {
cache.Request
// NewMaterializer will be called if there is no active materializer to fulfil
// the request. It should return a Materializer appropriate for streaming
// data to fulfil this request.
NewMaterializer() (Materializer, error)
// Type should return a string which uniquely identifies this type of request.
// The returned value is used as the prefix of the key used to index
// entries in the Store.
Type() string
}
Request is used to request data from the Store. Note that cache.Request is required, but some of the fields cache.RequestInfo fields are ignored (ex: MaxAge, and MustRevalidate).
type Result ¶ added in v1.10.0
type Result struct {
Index uint64
Value interface{}
// Cached is true if the requested value was already available locally. If
// the value is false, it indicates that GetFromView had to wait for an update,
Cached bool
}
Result returned from the View.
type Store ¶ added in v1.10.0
type Store struct {
// contains filtered or unexported fields
}
Store of Materializers. Store implements an interface similar to agent/cache.Cache, and allows a single Materializer to fulfil multiple requests as long as the requests are identical. Store is used in place of agent/cache.Cache because with the streaming backend there is no longer any need to run a background goroutine to refresh stored values.
func NewStore ¶ added in v1.10.0
func NewStore(logger hclog.Logger) *Store
NewStore creates and returns a Store that is ready for use. The caller must call Store.Run (likely in a separate goroutine) to start the expiration loop.
func (*Store) Get ¶ added in v1.10.0
Get a value from the store, blocking if the store has not yet seen the req.Index value. See agent/cache.Cache.Get for complete documentation.
func (*Store) Notify ¶ added in v1.10.0
func (s *Store) Notify( ctx context.Context, req Request, correlationID string, updateCh chan<- cache.UpdateEvent, ) error
Notify the updateCh when there are updates to the entry identified by req. See agent/cache.Cache.Notify for complete documentation.
Request.CacheInfo().Timeout is ignored because it is not really relevant in this case. Instead set a deadline on the context.
func (*Store) NotifyCallback ¶ added in v1.13.0
func (s *Store) NotifyCallback( ctx context.Context, req Request, correlationID string, cb cache.Callback, ) error
NotifyCallback subscribes to updates of the entry identified by req in the same way as Notify, but accepts a callback function instead of a channel.
type StreamClient ¶
type StreamClient interface {
Subscribe(ctx context.Context, in *pbsubscribe.SubscribeRequest, opts ...grpc.CallOption) (pbsubscribe.StateChangeSubscription_SubscribeClient, error)
}
StreamClient provides a subscription to state change events.
type View ¶
type View interface {
// Update is called when one or more events are received. The first call will
// include _all_ events in the initial snapshot which may be an empty set.
// Subsequent calls will contain one or more update events in the order they
// are received.
Update(events []*pbsubscribe.Event) error
// Result returns the type-specific cache result based on the state. When no
// events have been delivered yet the result should be an empty value type
// suitable to return to clients in case there is an empty result on the
// servers. The index the materialized view represents is maintained
// separately and passed in in case the return type needs an Index field
// populating. This allows implementations to not worry about maintaining
// indexes seen during Update.
Result(index uint64) interface{}
// Reset the view to the zero state, done in preparation for receiving a new
// snapshot.
Reset()
}
View receives events from, and return results to, Materializer. A view is responsible for converting the pbsubscribe.Event.Payload into the local type, and storing it so that it can be returned by Result().
Source Files