Check the invariant for a block in the store:

• If the previous block is defined, then its block height is currentBlock.height - 1.
• If the previous block is defined, then its com.digitalasset.canton.domain.block.data.BlockInfo.lastTs of the the com.digitalasset.canton.domain.block.data.BlockEphemeralState is no later than the one of the current block. If there are neither events nor registrations in the current block, the two are equal.
• If the previous block is defined, the com.digitalasset.canton.domain.block.data.BlockInfo.latestTopologyClientTimestamp of the its com.digitalasset.canton.domain.block.data.BlockEphemeralState is no later than the one of the current block. In particular, if com.digitalasset.canton.domain.block.data.BlockInfo.latestTopologyClientTimestamp is defined in the previous block, then so is it in the successor block. If it is defined in the successor block, then it is the same as in the predecessor block unless the block contains events addressed to the sequencer's topology client.
• All events and member registrations in the current block are ealier or equal to the blocks' com.digitalasset.canton.domain.block.data.BlockInfo.lastTs. com.digitalasset.canton.domain.block.data.BlockInfo.lastTs is equal to the latest timestamp of an event or member registration in the block, unless the previous block is undefined and the block contains member registrations.
• All events in the block addressed to the topologyClientMember have timestamps of at most com.digitalasset.canton.domain.block.data.BlockInfo.latestTopologyClientTimestamp of the current block.

Removes a shutdown task from the list using a token returned by runOnShutdown

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

Finalizes the current block whose updates have been added in the calls to partialBlockUpdate since the last call to finalizeBlockUpdate.

This method must not be called concurrently with itself or partialBlockUpdate, and must be called for the blocks in monotonically increasing order of height.

Get initial state from which this sequencer node supports serving requests. The member counters returned as part of this initial state indicate the minimum counters that this sequencer supports serving requests from. If a member is not included in these counters, it means that this sequencer node supports serving requests from the com.digitalasset.canton.data.CounterCompanion.Genesis for that member.

Retrieve the timestamp of the initial topology snapshot if available.

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.

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.

How often to poll to check that all tasks have completed.

Use this method to create a PromiseUnlessShutdown that will automatically be cancelled when the close context is closed. This allows proper clean up of stray promises when the node is transitioning to a passive state.

Note: you should *not* invoke success on the returned promise but rather use trySuccess. The reason is that the call to success may fail in case of shutdown.

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

Stores some updates that happen in a single block. May be called several times for the same block and the same update may be contained in several of the calls. Before adding updates of a subsequent block, finalizeBlockUpdate must be called to wrap up the current block.

This method must not be called concurrently with itself or finalizeBlockUpdate.

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.

The current state of the sequencer, which can be used when the node is restarted to deterministically derive the following counters and timestamps.

The state excludes updates of unfinalized blocks added with partialBlockUpdate.

Serve events (or tombstones) for member with the given counter range.

The returned range may include events added with partialBlockUpdate even before the corresponding block has been finalized with finalizeBlockUpdate. This ensures that com.digitalasset.canton.sequencing.client.SequencerClients can immediately read events when they are added. In particular, the sequencer's com.digitalasset.canton.topology.client.DomainTopologyClient will see such updates so that block processing can request a com.digitalasset.canton.topology.client.TopologySnapshot that includes the updates in a block while processing continues for the same block.

The state at the end of the block that contains the given timestamp. This will typically be used to inform other sequencer nodes being initialized of the initial state they should use based on the timestamp they provide which is typically the timestamp of their signing key.

Same as runOnShutdown_ but returns a token that allows you to remove the task explicitly from being run using cancelShutdownTask

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".

Set initial state of the sequencer node from which it supports serving requests. This should be called at most once. If not called, it means this sequencer node can server requests from genesis.

Updates the last unsupported member sequencer counter, i.e. the one just before the first supported sequencer counter. Only ever increases counter.