import { INackContent , NackErrorType } from "@fluidframework/protocol-definitions" ; export interface IThrottlerResponse { throttleStatus : boolean ; throttleReason : string ; retryAfterInMs : number ; } export interface IThrottlingMetrics extends IThrottlerResponse { count : number ; lastCoolDownAt : number ; } export class ThrottlingError implements INackContent { readonly code = 429 ; readonly type = NackErrorType . ThrottlingError ; constructor ( /**
     * Explanation for throttling.
     */ readonly message , /**
     * Client should retry operation after this many seconds.
     */ readonly retryAfter ) { } } /**
 * Storage getter/setter with logic specific to throttling metrics.
 */ export interface IThrottleStorageManager { /**
     * Store throttling metrics for the given id.
     */ setThrottlingMetric ( id , throttlingMetric ) : Promise < void > ; /**
     * Get throttling metrics for the given id.
     */ getThrottlingMetric ( id ) : Promise < IThrottlingMetrics > ; } /**
 * Runs rate-limiting calculations for IThrottler.
 */ export interface IThrottlerHelper { /**
     * Updates throttling metric count for given id, runs rate-limiting algorithm, and updates throttle status.
     */ updateCount ( id , count ) : Promise < IThrottlerResponse > ; /**
     * Retrieve most recent throttle status for given id.
     */ getThrottleStatus ( id ) : Promise < IThrottlerResponse > ; } /**
 * Determines if an operation should be allowed or throttled.
 */ export interface IThrottler { throws incrementCount ( id , weight ? ) : void ; /**
     * Decrement the current processing count of operations by `weight`.
     */ decrementCount ( id , weight ? ) : void ; }