Acknowledge that a member has successfully handled all events up to and including the timestamp provided. Makes earlier events for this member available for pruning. The timestamp is in sequencer time and will likely correspond to an event that the client has processed however this is not validated. It is assumed that members in consecutive calls will never acknowledge an earlier timestamp however this is also not validated (and could be invalid if the member has many subscriptions from the same or many processes). It is expected that members will periodically call this endpoint with their latest clean timestamp rather than calling it for every event they process. The default interval is in the range of once a minute.

A member should only acknowledge timestamps it has actually received. The behaviour of the sequencer is implementation-defined when a member acknowledges a later timestamp.

Newer version of acknowledgements. To be active for protocol versions >= 4. The signature is checked on the server side to avoid that malicious sequencers create fake acknowledgements in multi-writer architectures where writers don't fully trust each other.

Acknowledge that a member has successfully handled all events up to and including the timestamp provided. Makes earlier events for this member available for pruning. The timestamp is in sequencer time and will likely correspond to an event that the client has processed however this is not validated. It is assumed that members in consecutive calls will never acknowledge an earlier timestamp however this is also not validated (and could be invalid if the member has many subscriptions from the same or many processes). It is expected that members will periodically call this endpoint with their latest clean timestamp rather than calling it for every event they process. The default interval is in the range of once a minute.

A member should only acknowledge timestamps it has actually received. The behaviour of the sequencer is implementation-defined when a member acknowledges a later timestamp.

Currently this method is only implemented by the enterprise-only Ethereum driver. It immediately returns a Left for ledgers where it is not implemented.

This method authorizes a com.digitalasset.canton.domain.sequencing.sequencer.LedgerIdentity on the underlying ledger. In the Ethereum-backed ledger, this enables the given Ethereum account to also write to the deployed Sequencer.sol contract. Therefore, this method needs to be called before being able to use an Ethereum sequencer with a given Ethereum account.

NB: in Ethereum, this method needs to be called by an Ethereum sequencer whose associated Ethereum account is already authorized. Else the authorization itself will fail. To bootstrap the authorization, the Ethereum account that deploys the Sequencer.sol contract is the first account to be authorized.

Blocks until all earlier tasks have completed and then prevents further tasks from being run.

closeAsync asynchronously releases resources held by a future

Disable the provided member. Should prevent them from reading or writing in the future (although they can still be addressed). Their unread data can also be pruned. Effectively disables all instances of this member.

First check is the member is registered and if not call registerMember

Return a structure indicating the health status of the sequencer implementation. Should succeed even if the configured datastore is unavailable.

Check whether we're closing. Susceptible to race conditions; unless you're using using this as a flag to the retry lib or you really know what you're doing, prefer performUnlessClosing and friends.

Always returns false for Sequencer drivers that don't support ledger identity authorization. Otherwise returns whether the given ledger identity is registered on the underlying ledger (and configured smart contract).

track running futures on shutdown

set to true to get detailed information about all futures that did not complete during shutdown. if set to false, we don't do anything.

Locate a timestamp relative to the earliest available sequencer event based on an index starting at one.

When index == 1, indicates the progress of pruning as the timestamp of the oldest unpruned response When index > 1, returns the timestamp of the index'th oldest response which is useful for pruning in batches when index == batchSize.

Register a listener function that will be called every time the health status of the sequencer changes. Useful for things like signalling health changes to load balancers

Performs the task given by f unless a shutdown has been initiated. The shutdown will only begin after f completes, but other tasks may execute concurrently with f, if started using this function, or one of the other variants (performUnlessClosingF and performUnlessClosingEitherT). The tasks are assumed to take less than closingTimeout to complete.

DO NOT CALL this.close as part of f, because it will result in a deadlock.

Performs the EitherT[Future] given by etf unless a shutdown has been initiated, in which case the provided error is returned instead. Both etf and the error are lazy; etf is only evaluated if there is no shutdown, the error only if we're shutting down. The shutdown will only begin after etf completes, but other tasks may execute concurrently with etf, if started using this function, or one of the other variants (performUnlessClosing and performUnlessClosingF). The tasks are assumed to take less than closingTimeout to complete.

DO NOT CALL this.close as part of etf, because it will result in a deadlock.

Performs the Future given by f unless a shutdown has been initiated. The future is lazy and not evaluated during shutdown. The shutdown will only begin after f completes, but other tasks may execute concurrently with f, if started using this function, or one of the other variants (performUnlessClosing and performUnlessClosingEitherT). The tasks are assumed to take less than closingTimeout to complete.

DO NOT CALL this.close as part of f, because it will result in a deadlock.

Prune as much sequencer data as safely possible without breaking operation (except for members that have been previously flagged as disabled). Sequencers are permitted to prune to an earlier timestamp if required to for their own consistency. For example, the Database Sequencer will adjust this time to a potentially earlier point in time where counter checkpoints are available for all members (who aren't being ignored).

Implementations that support pruning also update the "oldest-response-age" metric if pruning succeeds.

Builds a pruning scheduler once storage is available

Return a structure containing the members registered with the sequencer and the latest positions of clients reading events.

Report the max-event-age metric based on the oldest event timestamp and the current clock time or zero if no oldest timestamp exists (e.g. events fully pruned).

Register a task to run when shutdown is initiated.

You can use this for example to register tasks that cancel long-running computations, whose termination you can then wait for in "closeAsync".

Return a snapshot state that other newly onboarded sequencers can use as an initial state from which to support serving events. This state depends on the provided timestamp and will contain registered members, counters per member, latest timestamp (which will be greater than or equal to the provided timestamp) as well as a sequencer implementation specific piece of information such that all together form the point after which the new sequencer can safely operate. The provided timestamp is typically the timestamp of the requesting sequencer's private key, which is the point in time where it can effectively sign events.