ParachainSystem¶

Calls¶

authorize_upgrade¶

See [Pallet::authorize_upgrade].

Attributes¶

Name	Type
code_hash	`T::Hash`
check_version	`bool`

Python¶

call = substrate.compose_call(
    'ParachainSystem', 'authorize_upgrade', {
    'check_version': 'bool',
    'code_hash': 'scale_info::12',
}
)

enact_authorized_upgrade¶

See [Pallet::enact_authorized_upgrade].

Attributes¶

Name	Type
code	`Vec<u8>`

Python¶

call = substrate.compose_call(
    'ParachainSystem', 'enact_authorized_upgrade', {'code': 'Bytes'}
)

set_validation_data¶

See [Pallet::set_validation_data].

Attributes¶

Name	Type
data	`ParachainInherentData`

Python¶

call = substrate.compose_call(
    'ParachainSystem', 'set_validation_data', {
    'data': {
        'downward_messages': [
            {
                'msg': 'Bytes',
                'sent_at': 'u32',
            },
        ],
        'horizontal_messages': 'scale_info::86',
        'relay_chain_state': {
            'trie_nodes': 'scale_info::83',
        },
        'validation_data': {
            'max_pov_size': 'u32',
            'parent_head': 'Bytes',
            'relay_parent_number': 'u32',
            'relay_parent_storage_root': 'scale_info::12',
        },
    },
}
)

sudo_send_upward_message¶

See [Pallet::sudo_send_upward_message].

Attributes¶

Name	Type
message	`UpwardMessage`

Python¶

call = substrate.compose_call(
    'ParachainSystem', 'sudo_send_upward_message', {'message': 'Bytes'}
)

Events¶

DownwardMessagesProcessed¶

Downward messages were processed using the given weight.

Attributes¶

Name	Type	Composition
weight_used	`Weight`	`{'ref_time': 'u64', 'proof_size': 'u64'}`
dmq_head	`relay_chain::Hash`	`scale_info::12`

DownwardMessagesReceived¶

Some downward messages have been received and will be processed.

Attributes¶

Name	Type	Composition
count	`u32`	`u32`

UpgradeAuthorized¶

An upgrade has been authorized.

Attributes¶

Name	Type	Composition
code_hash	`T::Hash`	`scale_info::12`

UpwardMessageSent¶

An upward message was sent to the relay chain.

Attributes¶

Name	Type	Composition
message_hash	`Option<XcmHash>`	`(None, '[u8; 32]')`

ValidationFunctionApplied¶

The validation function was applied as of the contained relay chain block number.

Attributes¶

Name	Type	Composition
relay_chain_block_num	`RelayChainBlockNumber`	`u32`

ValidationFunctionDiscarded¶

The relay-chain aborted the upgrade process.

Attributes¶

No attributes

ValidationFunctionStored¶

The validation function has been scheduled to apply.

Attributes¶

No attributes

Storage functions¶

AggregatedUnincludedSegment¶

Storage field that keeps track of bandwidth used by the unincluded segment along with the latest the latest HRMP watermark. Used for limiting the acceptance of new blocks with respect to relay chain constraints.

Python¶

result = substrate.query(
    'ParachainSystem', 'AggregatedUnincludedSegment', []
)

Return value¶

{
    'consumed_go_ahead_signal': (None, ('Abort', 'GoAhead')),
    'hrmp_watermark': (None, 'u32'),
    'used_bandwidth': {
        'hrmp_outgoing': 'scale_info::346',
        'ump_msg_count': 'u32',
        'ump_total_bytes': 'u32',
    },
}

AnnouncedHrmpMessagesPerCandidate¶

The number of HRMP messages we observed in on_initialize and thus used that number for announcing the weight of on_initialize and on_finalize.

Python¶

result = substrate.query(
    'ParachainSystem', 'AnnouncedHrmpMessagesPerCandidate', []
)

Return value¶

'u32'

AuthorizedUpgrade¶

The next authorized upgrade, if there is one.

Python¶

result = substrate.query(
    'ParachainSystem', 'AuthorizedUpgrade', []
)

Return value¶

{'check_version': 'bool', 'code_hash': 'scale_info::12'}

CustomValidationHeadData¶

A custom head data that should be returned as result of validate_block.

See Pallet::set_custom_validation_head_data for more information.

Python¶

result = substrate.query(
    'ParachainSystem', 'CustomValidationHeadData', []
)

Return value¶

'Bytes'

DidSetValidationCode¶

Were the validation data set to notify the relay chain?

Python¶

result = substrate.query(
    'ParachainSystem', 'DidSetValidationCode', []
)

Return value¶

'bool'

HostConfiguration¶

The parachain host configuration that was obtained from the relay parent.

This field is meant to be updated each block with the validation data inherent. Therefore, before processing of the inherent, e.g. in on_initialize this data may be stale.

This data is also absent from the genesis.

Python¶

result = substrate.query(
    'ParachainSystem', 'HostConfiguration', []
)

Return value¶

{
    'async_backing_params': {
        'allowed_ancestry_len': 'u32',
        'max_candidate_depth': 'u32',
    },
    'hrmp_max_message_num_per_candidate': 'u32',
    'max_code_size': 'u32',
    'max_head_data_size': 'u32',
    'max_upward_message_num_per_candidate': 'u32',
    'max_upward_message_size': 'u32',
    'max_upward_queue_count': 'u32',
    'max_upward_queue_size': 'u32',
    'validation_upgrade_cooldown': 'u32',
    'validation_upgrade_delay': 'u32',
}

HrmpOutboundMessages¶

HRMP messages that were sent in a block.

This will be cleared in on_initialize of each new block.

Python¶

result = substrate.query(
    'ParachainSystem', 'HrmpOutboundMessages', []
)

Return value¶

[{'data': 'Bytes', 'recipient': 'u32'}]

HrmpWatermark¶

HRMP watermark that was set in a block.

This will be cleared in on_initialize of each new block.

Python¶

result = substrate.query(
    'ParachainSystem', 'HrmpWatermark', []
)

Return value¶

'u32'

LastDmqMqcHead¶

The last downward message queue chain head we have observed.

This value is loaded before and saved after processing inbound downward messages carried by the system inherent.

Python¶

result = substrate.query(
    'ParachainSystem', 'LastDmqMqcHead', []
)

Return value¶

'scale_info::12'

LastHrmpMqcHeads¶

The message queue chain heads we have observed per each channel incoming channel.

This value is loaded before and saved after processing inbound downward messages carried by the system inherent.

Python¶

result = substrate.query(
    'ParachainSystem', 'LastHrmpMqcHeads', []
)

Return value¶

'scale_info::363'

LastRelayChainBlockNumber¶

The relay chain block number associated with the last parachain block.

Python¶

result = substrate.query(
    'ParachainSystem', 'LastRelayChainBlockNumber', []
)

Return value¶

'u32'

NewValidationCode¶

Validation code that is set by the parachain and is to be communicated to collator and consequently the relay-chain.

This will be cleared in on_initialize of each new block if no other pallet already set the value.

Python¶

result = substrate.query(
    'ParachainSystem', 'NewValidationCode', []
)

Return value¶

'Bytes'

PendingUpwardMessages¶

Upward messages that are still pending and not yet send to the relay chain.

Python¶

result = substrate.query(
    'ParachainSystem', 'PendingUpwardMessages', []
)

Return value¶

['Bytes']

PendingValidationCode¶

In case of a scheduled upgrade, this storage field contains the validation code to be applied.

As soon as the relay chain gives us the go-ahead signal, we will overwrite the [:code][sp_core::storage::well_known_keys::CODE] which will result the next block process with the new validation code. This concludes the upgrade process.

Python¶

result = substrate.query(
    'ParachainSystem', 'PendingValidationCode', []
)

Return value¶

'Bytes'

ProcessedDownwardMessages¶

Number of downward messages processed in a block.

This will be cleared in on_initialize of each new block.

Python¶

result = substrate.query(
    'ParachainSystem', 'ProcessedDownwardMessages', []
)

Return value¶

'u32'

RelayStateProof¶

The state proof for the last relay parent block.

This field is meant to be updated each block with the validation data inherent. Therefore, before processing of the inherent, e.g. in on_initialize this data may be stale.

This data is also absent from the genesis.

Python¶

result = substrate.query(
    'ParachainSystem', 'RelayStateProof', []
)

Return value¶

{'trie_nodes': 'scale_info::83'}

RelevantMessagingState¶

The snapshot of some state related to messaging relevant to the current parachain as per the relay parent.

This field is meant to be updated each block with the validation data inherent. Therefore, before processing of the inherent, e.g. in on_initialize this data may be stale.

This data is also absent from the genesis.

Python¶

result = substrate.query(
    'ParachainSystem', 'RelevantMessagingState', []
)

Return value¶

{
    'dmq_mqc_head': 'scale_info::12',
    'egress_channels': [
        (
            'u32',
            {
                'max_capacity': 'u32',
                'max_message_size': 'u32',
                'max_total_size': 'u32',
                'mqc_head': (None, 'scale_info::12'),
                'msg_count': 'u32',
                'total_size': 'u32',
            },
        ),
    ],
    'ingress_channels': [
        (
            'u32',
            {
                'max_capacity': 'u32',
                'max_message_size': 'u32',
                'max_total_size': 'u32',
                'mqc_head': (None, 'scale_info::12'),
                'msg_count': 'u32',
                'total_size': 'u32',
            },
        ),
    ],
    'relay_dispatch_queue_remaining_capacity': {
        'remaining_count': 'u32',
        'remaining_size': 'u32',
    },
}

ReservedDmpWeightOverride¶

The weight we reserve at the beginning of the block for processing DMP messages. This overrides the amount set in the Config trait.

Python¶

result = substrate.query(
    'ParachainSystem', 'ReservedDmpWeightOverride', []
)

Return value¶

{'proof_size': 'u64', 'ref_time': 'u64'}

ReservedXcmpWeightOverride¶

The weight we reserve at the beginning of the block for processing XCMP messages. This overrides the amount set in the Config trait.

Python¶

result = substrate.query(
    'ParachainSystem', 'ReservedXcmpWeightOverride', []
)

Return value¶

{'proof_size': 'u64', 'ref_time': 'u64'}

UnincludedSegment¶

Latest included block descendants the runtime accepted. In other words, these are ancestors of the currently executing block which have not been included in the observed relay-chain state.

The segment length is limited by the capacity returned from the [ConsensusHook] configured in the pallet.

Python¶

result = substrate.query(
    'ParachainSystem', 'UnincludedSegment', []
)

Return value¶

[
    {
        'consumed_go_ahead_signal': (None, ('Abort', 'GoAhead')),
        'para_head_hash': (None, 'scale_info::12'),
        'used_bandwidth': {
            'hrmp_outgoing': 'scale_info::346',
            'ump_msg_count': 'u32',
            'ump_total_bytes': 'u32',
        },
    },
]

UpgradeGoAhead¶

Optional upgrade go-ahead signal from the relay-chain.

This storage item is a mirror of the corresponding value for the current parachain from the relay-chain. This value is ephemeral which means it doesn't hit the storage. This value is set after the inherent.

Python¶

result = substrate.query(
    'ParachainSystem', 'UpgradeGoAhead', []
)

Return value¶

(None, ('Abort', 'GoAhead'))

UpgradeRestrictionSignal¶

An option which indicates if the relay-chain restricts signalling a validation code upgrade. In other words, if this is Some and [NewValidationCode] is Some then the produced candidate will be invalid.

This storage item is a mirror of the corresponding value for the current parachain from the relay-chain. This value is ephemeral which means it doesn't hit the storage. This value is set after the inherent.

Python¶

result = substrate.query(
    'ParachainSystem', 'UpgradeRestrictionSignal', []
)

Return value¶

(None, ('Present', ))

UpwardMessages¶

Upward messages that were sent in a block.

This will be cleared in on_initialize of each new block.

Python¶

result = substrate.query(
    'ParachainSystem', 'UpwardMessages', []
)

Return value¶

['Bytes']

ValidationData¶

The [PersistedValidationData] set for this block. This value is expected to be set only once per block and it's never stored in the trie.

Python¶

result = substrate.query(
    'ParachainSystem', 'ValidationData', []
)

Return value¶

{
    'max_pov_size': 'u32',
    'parent_head': 'Bytes',
    'relay_parent_number': 'u32',
    'relay_parent_storage_root': 'scale_info::12',
}

Errors¶

HostConfigurationNotAvailable¶

The inherent which supplies the host configuration did not run this block.

NotScheduled¶

No validation function upgrade is currently scheduled.

NothingAuthorized¶

No code upgrade has been authorized.

OverlappingUpgrades¶

Attempt to upgrade validation function while existing upgrade pending.

ProhibitedByPolkadot¶

Polkadot currently prohibits this parachain from upgrading its validation function.

TooBig¶

The supplied validation function has compiled into a blob larger than Polkadot is willing to run.

Unauthorized¶

The given code upgrade has not been authorized.

ValidationDataNotAvailable¶

The inherent which supplies the validation data did not run this block.