AddCost adds the cost to the context.

EnsurePermission middleware that checks if the session type has the required permission.

EnsureUsage is a middleware that checks if the quota has enough usage left.

GetAccessQuota returns the access quota from the context.

GetProjectID returns the projectID and if its active from the context.

GetTime returns the time from the context.

HasSpending returns the result of spending from the context.

SetCost middleware that sets the cost of the request, and defaults to Option.BaseRequestCost.

SpendUsage is a middleware that spends the usage from the quota.

WithCost sets the cost and rate limit increment to the context.

WithTime sets the time to the context.

RateLimitConfig is the configuration for the rate limiter middleware.

Client is the interface that wraps the basic FetchKeyQuota, GetUsage and SpendQuota methods.