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Ledger API Reference¶

com/digitalasset/ledger/api/v1/active_contracts_service.proto¶

GetActiveContractsRequest¶

Field	Type	Description
ledger_id	string	Must correspond to the ledger ID reported by the Ledger Identification Service. Must be a valid LedgerString (as described in `value.proto`). Required
filter	TransactionFilter	Templates to include in the served snapshot, per party. Required
verbose	bool	If enabled, values served over the API will contain more information than strictly necessary to interpret the data. In particular, setting the verbose flag to true triggers the ledger to include labels for record fields. Optional
trace_context	TraceContext	Server side tracing will be registered as a child of the submitted context. This field is a future extension point and is currently not supported. Optional

GetActiveContractsResponse¶

Field	Type	Label	Description
offset	string		Included in the last message. The client should start consuming the transactions endpoint with this offset. The format of this field is described in `ledger_offset.proto`. Required
workflow_id	string		The workflow that created the contracts. Must be a valid LedgerString (as described in `value.proto`). Optional
active_contracts	CreatedEvent	repeated	The list of contracts that were introduced by the workflow with `workflow_id` at the offset. Must be a valid LedgerString (as described in `value.proto`). Optional
trace_context	TraceContext		Zipkin trace context. This field is a future extension point and is currently not supported. Optional

ActiveContractsService¶

Allows clients to initialize themselves according to a fairly recent state of the ledger without reading through all transactions that were committed since the ledger’s creation.

Method name	Request type	Response type	Description
GetActiveContracts	GetActiveContractsRequest	GetActiveContractsResponse	Returns a stream of the latest snapshot of active contracts. If there are no active contracts, the stream returns a single GetActiveContractsResponse message with the offset at which the snapshot has been taken. Clients SHOULD use the offset in the last GetActiveContractsResponse message to continue streaming transactions with the transaction service. Clients SHOULD NOT assume that the set of active contracts they receive reflects the state at the ledger end.

com/digitalasset/ledger/api/v1/admin/config_management_service.proto¶

GetTimeModelRequest¶

GetTimeModelResponse¶

Field	Type	Label	Description
configuration_generation	int64		The current configuration generation. The generation is a monotonically increasing integer that is incremented on each change. Used when setting the time model.
time_model	TimeModel		The current ledger time model.

SetTimeModelRequest¶

Field	Type	Description
submission_id	string	Submission identifier used for tracking the request and to reject duplicate submissions. Required.
maximum_record_time	google.protobuf.Timestamp	Deadline for the configuration change after which the change is rejected.
configuration_generation	int64	The current configuration generation which we’re submitting the change against. This is used to perform a compare-and-swap of the configuration to safeguard against concurrent modifications. Required.
new_time_model	TimeModel	The new time model that replaces the current one. Required.

SetTimeModelResponse¶

Field	Type	Label	Description
configuration_generation	int64		The configuration generation of the committed time model.

TimeModel¶

Field	Type	Description
min_transaction_latency	google.protobuf.Duration	The expected minimum latency of a transaction. Required.
max_clock_skew	google.protobuf.Duration	The maximum allowed clock skew between the ledger and clients. Required.
max_ttl	google.protobuf.Duration	The maximum allowed time to live for a transaction. Must be greater than the derived minimum time to live. Required.

ConfigManagementService¶

Ledger configuration management service provides methods for the ledger administrator to change the current ledger configuration. The services provides methods to modify different aspects of the configuration.

Method name	Request type	Response type	Description
GetTimeModel	GetTimeModelRequest	GetTimeModelResponse	Return the currently active time model and the current configuration generation.
SetTimeModel	SetTimeModelRequest	SetTimeModelResponse	Set the ledger time model. In case of failure this method responds with: - INVALID_ARGUMENT if arguments are invalid, or the provided configuration generation does not match the current active configuration generation. The caller is expected to retry by again fetching current time model using ‘GetTimeModel’, applying changes and resubmitting. - ABORTED if the request is rejected or times out. Note that a timed out request may have still been committed to the ledger. Application should re-query the current time model before retrying. - UNIMPLEMENTED if this method is not supported by the backing ledger.

com/digitalasset/ledger/api/v1/admin/package_management_service.proto¶

ListKnownPackagesRequest¶

ListKnownPackagesResponse¶

Field	Type	Label	Description
package_details	PackageDetails	repeated	The details of all DAML-LF packages known to backing participant. Required

PackageDetails¶

Field	Type	Description
package_id	string	The identity of the DAML-LF package. Must be a valid PackageIdString (as describe in `value.proto`). Required
package_size	uint64	Size of the package in bytes. The size of the package is given by the size of the `daml_lf` ArchivePayload. See further details in `daml_lf.proto`. Required
known_since	google.protobuf.Timestamp	Indicates since when the package is known to the backing participant. Required
source_description	string	Description provided by the backing participant describing where it got the package from. Optional

UploadDarFileRequest¶

Field	Type	Label	Description
dar_file	bytes		Contains a DAML archive DAR file, which in turn is a jar like zipped container for `daml_lf` archives. See further details in `daml_lf.proto`. Required
submission_id	string		Unique submission identifier. Optional, defaults to a random identifier.

UploadDarFileResponse¶

An empty message that is received when the upload operation succeeded.

PackageManagementService¶

Query the DAML-LF packages supported by the ledger participant and upload DAR files. We use ‘backing participant’ to refer to this specific participant in the methods of this API. When the participant is run in mode requiring authentication, all the calls in this interface will respond with UNAUTHENTICATED, if the caller fails to provide a valid access token, and will respond with PERMISSION_DENIED, if the claims in the token are insufficient to perform a given operation. Subsequently, only specific errors of individual calls not related to authorization will be described.

Method name	Request type	Response type	Description
ListKnownPackages	ListKnownPackagesRequest	ListKnownPackagesResponse	Returns the details of all DAML-LF packages known to the backing participant. This request will always succeed.
UploadDarFile	UploadDarFileRequest	UploadDarFileResponse	Upload a DAR file to the backing participant. Depending on the ledger implementation this might also make the package available on the whole ledger. This call might not be supported by some ledger implementations. Canton could be an example, where uploading a DAR is not sufficient to render it usable, it must be activated first. This call may: - Succeed, if the package was successfully uploaded, or if the same package was already uploaded before. - Respond with UNIMPLEMENTED, if DAR package uploading is not supported by the backing participant. - Respond with INVALID_ARGUMENT, if the DAR file is too big or malformed. The maximum supported size is implementation specific.

com/digitalasset/ledger/api/v1/admin/party_management_service.proto¶

AllocatePartyRequest¶

Field	Type	Label	Description
party_id_hint	string		A hint to the backing participant what party id to allocate. It can be ignored. Must be a valid PartyIdString (as describe in `value.proto`). Optional
display_name	string		Human readable name of the party to be added to the participant. It doesn’t have to be unique. Optional

AllocatePartyResponse¶

Field	Type	Label	Description
party_details	PartyDetails

GetParticipantIdRequest¶

GetParticipantIdResponse¶

Field	Type	Label	Description
participant_id	string		Identifier of the participant, which SHOULD be globally unique. Must be a valid LedgerString (as describe in `value.proto`).

ListKnownPartiesRequest¶

ListKnownPartiesResponse¶

Field	Type	Label	Description
party_details	PartyDetails	repeated	The details of all DAML parties hosted by the participant. Required

PartyDetails¶

Field	Type	Description
party	string	The stable unique identifier of a DAML party. Must be a valid PartyIdString (as described in `value.proto`). Required
display_name	string	Human readable name associated with the party. Caution, it might not be unique. Optional
is_local	bool	true if party is hosted by the backing participant. Required

PartyManagementService¶

Inspect the party management state of a ledger participant and modify the parts that are modifiable. We use ‘backing participant’ to refer to this specific participant in the methods of this API. When the participant is run in mode requiring authentication, all the calls in this interface will respond with UNAUTHENTICATED, if the caller fails to provide a valid access token, and will respond with PERMISSION_DENIED, if the claims in the token are insufficient to perform a given operation. Subsequently, only specific errors of individual calls not related to authorization will be described.

Method name	Request type	Response type	Description
GetParticipantId	GetParticipantIdRequest	GetParticipantIdResponse	Return the identifier of the backing participant. All horizontally scaled replicas should return the same id. This method is expected to succeed provided the backing participant is healthy, otherwise it responds with INTERNAL grpc error. daml-on-sql: returns an identifier supplied on command line at launch time daml-on-kv-ledger: as above canton: returns globally unique identifier of the backing participant
ListKnownParties	ListKnownPartiesRequest	ListKnownPartiesResponse	List the parties known by the backing participant. The list returned contains parties whose ledger access is facilitated by backing participant and the ones maintained elsewhere. This request will always succeed.
AllocateParty	AllocatePartyRequest	AllocatePartyResponse	Adds a new party to the set managed by the backing participant. Caller specifies a party identifier suggestion, the actual identifier allocated might be different and is implementation specific. This call may: - Succeed, in which case the actual allocated identifier is visible in the response. - Respond with UNIMPLEMENTED if synchronous party allocation is not supported by the backing participant. - Respond with INVALID_ARGUMENT if the provided hint and/or display name is invalid on the given ledger (see below). daml-on-sql: suggestion’s uniqueness is checked and call rejected if the identifier is already present daml-on-kv-ledger: suggestion’s uniqueness is checked by the validators in the consensus layer and call rejected if the identifier is already present. canton: completely different globally unique identifier is allocated. Behind the scenes calls to an internal protocol are made. As that protocol is richer than the the surface protocol, the arguments take implicit values

com/digitalasset/ledger/api/v1/command_completion_service.proto¶

Checkpoint¶

Checkpoints may be used to:

detect time out of commands.
provide an offset which can be used to restart consumption.

Field	Type	Label	Description
record_time	google.protobuf.Timestamp		All commands with a maximum record time below this value MUST be considered lost if their completion has not arrived before this checkpoint. Required
offset	LedgerOffset		May be used in a subsequent CompletionStreamRequest to resume the consumption of this stream at a later time. Required

CompletionEndRequest¶

Field	Type	Label	Description
ledger_id	string		Must correspond to the ledger ID reported by the Ledger Identification Service. Required Must be a valid LedgerString (as described in `value.proto`).
trace_context	TraceContext		Server side tracing will be registered as a child of the submitted context. This field is a future extension point and is currently not supported. Optional

CompletionEndResponse¶

Field	Type	Label	Description
offset	LedgerOffset		This offset can be used in a CompletionStreamRequest message. Required

CompletionStreamRequest¶

Field	Type	Label	Description
ledger_id	string		Must correspond to the ledger id reported by the Ledger Identification Service. Must be a valid LedgerString (as described in `value.proto`). Required
application_id	string		Only completions of commands submitted with the same application_id will be visible in the stream. Must be a valid LedgerString (as described in `value.proto`). Required
parties	string	repeated	Non-empty list of parties whose data should be included. Must be a valid PartyIdString (as described in `value.proto`). Required
offset	LedgerOffset		This field indicates the minimum offset for completions. This can be used to resume an earlier completion stream. Optional, if not set the ledger uses the current ledger end offset instead.

CompletionStreamResponse¶

Field	Type	Label	Description
checkpoint	Checkpoint		This checkpoint may be used to restart consumption. The checkpoint is after any completions in this response. Optional
completions	Completion	repeated	If set, one or more completions.

CommandCompletionService¶

Allows clients to observe the status of their submissions. Commands may be submitted via the Command Submission Service. The on-ledger effects of their submissions are disclosed by the Transaction Service. Commands may fail in 4 distinct manners:

INVALID_PARAMETER gRPC error on malformed payloads and missing required fields.
Failure communicated in the gRPC error.
Failure communicated in a Completion.
A Checkpoint with record_time > command mrt arrives through the Completion Stream, and the command’s Completion was not visible before. In this case the command is lost.

Clients that do not receive a successful completion about their submission MUST NOT assume that it was successful. Clients SHOULD subscribe to the CompletionStream before starting to submit commands to prevent race conditions.

Interprocess tracing of command submissions may be achieved via Zipkin by filling out the trace_context field. The server will return a child context of the submitted one, (or a new one if the context was missing) on both the Completion and Transaction streams.

Method name	Request type	Response type	Description
CompletionStream	CompletionStreamRequest	CompletionStreamResponse	Subscribe to command completion events.
CompletionEnd	CompletionEndRequest	CompletionEndResponse	Returns the offset after the latest completion.

com/digitalasset/ledger/api/v1/command_service.proto¶

SubmitAndWaitForTransactionIdResponse¶

Field	Type	Label	Description
transaction_id	string		The id of the transaction that resulted from the submitted command. Must be a valid LedgerString (as described in `value.proto`). Required

SubmitAndWaitForTransactionResponse¶

Field	Type	Label	Description
transaction	Transaction		The flat transaction that resulted from the submitted command. Required

SubmitAndWaitForTransactionTreeResponse¶

Field	Type	Label	Description
transaction	TransactionTree		The transaction tree that resulted from the submitted command. Required

SubmitAndWaitRequest¶

These commands are atomic, and will become transactions.

Field	Type	Label	Description
commands	Commands		The commands to be submitted. Required
trace_context	TraceContext		Server side tracing will be registered as a child of the submitted context. This field is a future extension point and is currently not supported. Optional

CommandService¶

Command Service is able to correlate submitted commands with completion data, identify timeouts, and return contextual information with each tracking result. This supports the implementation of stateless clients.

Method name	Request type	Response type	Description
SubmitAndWait	SubmitAndWaitRequest	.google.protobuf.Empty	Submits a single composite command and waits for its result. Returns `RESOURCE_EXHAUSTED` if the number of in-flight commands reached the maximum (if a limit is configured). Propagates the gRPC error of failed submissions including DAML interpretation errors.
SubmitAndWaitForTransactionId	SubmitAndWaitRequest	SubmitAndWaitForTransactionIdResponse	Submits a single composite command, waits for its result, and returns the transaction id. Returns `RESOURCE_EXHAUSTED` if the number of in-flight commands reached the maximum (if a limit is configured). Propagates the gRPC error of failed submissions including DAML interpretation errors.
SubmitAndWaitForTransaction	SubmitAndWaitRequest	SubmitAndWaitForTransactionResponse	Submits a single composite command, waits for its result, and returns the transaction. Returns `RESOURCE_EXHAUSTED` if the number of in-flight commands reached the maximum (if a limit is configured). Propagates the gRPC error of failed submissions including DAML interpretation errors.
SubmitAndWaitForTransactionTree	SubmitAndWaitRequest	SubmitAndWaitForTransactionTreeResponse	Submits a single composite command, waits for its result, and returns the transaction tree. Returns `RESOURCE_EXHAUSTED` if the number of in-flight commands reached the maximum (if a limit is configured). Propagates the gRPC error of failed submissions including DAML interpretation errors.

com/digitalasset/ledger/api/v1/command_submission_service.proto¶

SubmitRequest¶

The submitted commands will be processed atomically in a single transaction. Moreover, each Command in commands will be executed in the order specified by the request.

Field	Type	Label	Description
commands	Commands		The commands to be submitted in a single transaction. Required
trace_context	TraceContext		Server side tracing will be registered as a child of the submitted context. This field is a future extension point and is currently not supported. Optional

CommandSubmissionService¶

Allows clients to attempt advancing the ledger’s state by submitting commands. The final states of their submissions are disclosed by the Command Completion Service. The on-ledger effects of their submissions are disclosed by the Transaction Service. Commands may fail in 4 distinct manners:

INVALID_PARAMETER gRPC error on malformed payloads and missing required fields.
Failure communicated in the gRPC error.
Failure communicated in a Completion.
A Checkpoint with record_time > command mrt arrives through the Completion Stream, and the command’s Completion was not visible before. In this case the command is lost.

Clients that do not receive a successful completion about their submission MUST NOT assume that it was successful. Clients SHOULD subscribe to the CompletionStream before starting to submit commands to prevent race conditions.

Interprocess tracing of command submissions may be achieved via Zipkin by filling out the trace_context field. The server will return a child context of the submitted one, (or a new one if the context was missing) on both the Completion and Transaction streams.

Method name	Request type	Response type	Description
Submit	SubmitRequest	.google.protobuf.Empty	Submit a single composite command.

com/digitalasset/ledger/api/v1/commands.proto¶

Command¶

A command can either create a new contract or exercise a choice on an existing contract.

Field	Type	Label	Description
create	CreateCommand
exercise	ExerciseCommand
exerciseByKey	ExerciseByKeyCommand
createAndExercise	CreateAndExerciseCommand

Commands¶

A composite command that groups multiple commands together.

Field	Type	Label	Description
ledger_id	string		Must correspond to the ledger ID reported by the Ledger Identification Service. Must be a valid LedgerString (as described in `value.proto`). Required
workflow_id	string		Identifier of the on-ledger workflow that this command is a part of. Must be a valid LedgerString (as described in `value.proto`). Optional
application_id	string		Uniquely identifies the application (or its part) that issued the command. This is used in tracing across different components and to let applications subscribe to their own submissions only. Must be a valid LedgerString (as described in `value.proto`). Required
command_id	string		Uniquely identified the command. This identifier should be unique for each new command within an application domain, i.e., the triple (application_id, party, command_id) must be unique. It can be used for matching the requests with their respective completions. Must be a valid LedgerString (as described in `value.proto`). Required
party	string		Party on whose behalf the command should be executed. It is up to the server to verify that the authorisation can be granted and that the connection has been authenticated for that party. Must be a valid PartyIdString (as described in `value.proto`). Required
ledger_effective_time	google.protobuf.Timestamp		MUST be an approximation of the wall clock time on the ledger server. Required
maximum_record_time	google.protobuf.Timestamp		The deadline for observing this command in the completion stream before it can be considered to have timed out. Required
commands	Command	repeated	Individual elements of this atomic command. Must be non-empty. Required

CreateAndExerciseCommand¶

Create a contract and exercise a choice on it in the same transaction.

Field	Type	Description
template_id	Identifier	The template of the contract the client wants to create. Required
create_arguments	Record	The arguments required for creating a contract from this template. Required
choice	string	The name of the choice the client wants to exercise. Must be a valid NameString (as described in `value.proto`). Required
choice_argument	Value	The argument for this choice. Required

CreateCommand¶

Create a new contract instance based on a template.

Field	Type	Label	Description
template_id	Identifier		The template of contract the client wants to create. Required
create_arguments	Record		The arguments required for creating a contract from this template. Required

ExerciseByKeyCommand¶

Exercise a choice on an existing contract specified by its key.

Field	Type	Description
template_id	Identifier	The template of contract the client wants to exercise. Required
contract_key	Value	The key of the contract the client wants to exercise upon. Required
choice	string	The name of the choice the client wants to exercise. Must be a valid NameString (as described in `value.proto`) Required
choice_argument	Value	The argument for this choice. Required

ExerciseCommand¶

Exercise a choice on an existing contract.

Field	Type	Description
template_id	Identifier	The template of contract the client wants to exercise. Required
contract_id	string	The ID of the contract the client wants to exercise upon. Must be a valid LedgerString (as described in `value.proto`). Required
choice	string	The name of the choice the client wants to exercise. Must be a valid NameString (as described in `value.proto`) Required
choice_argument	Value	The argument for this choice. Required

com/digitalasset/ledger/api/v1/completion.proto¶

Completion¶

A completion represents the status of a submitted command on the ledger: it can be successful or failed.

Field	Type	Description
command_id	string	The ID of the succeeded or failed command. Must be a valid LedgerString (as described in `value.proto`). Required
status	google.rpc.Status	Identifies the exact type of the error. For example, malformed or double spend transactions will result in a `INVALID_ARGUMENT` status. Transactions with invalid time time windows (which may be valid at a later date) will result in an `ABORTED` error. Optional
transaction_id	string	The transaction_id of the transaction that resulted from the command with command_id. Only set for successfully executed commands. Must be a valid LedgerString (as described in `value.proto`). Optional
trace_context	TraceContext	The trace context submitted with the command. This field is a future extension point and is currently not supported. Optional

com/digitalasset/ledger/api/v1/event.proto¶

ArchivedEvent¶

Records that a contract has been archived, and choices may no longer be exercised on it.

Field	Type	Label	Description
event_id	string		The ID of this particular event. Must be a valid LedgerString (as described in `value.proto`). Required
contract_id	string		The ID of the archived contract. Must be a valid LedgerString (as described in `value.proto`). Required
template_id	Identifier		The template of the archived contract. Required
witness_parties	string	repeated	The parties that are notified of this event. For ArchivedEvent`s, these are the intersection of the stakeholders of the contract in question and the parties specified in the `TransactionFilter. The stakeholders are the union of the signatories and the observers of the contract. Each one of its elements must be a valid PartyIdString (as descibed in `value.proto`). Required

CreatedEvent¶

Records that a contract has been created, and choices may now be exercised on it.

Field	Type	Label	Description
event_id	string		The ID of this particular event. Must be a valid LedgerString (as described in `value.proto`). Required
contract_id	string		The ID of the created contract. Must be a valid LedgerString (as described in `value.proto`). Required
template_id	Identifier		The template of the created contract. Required
contract_key	Value		The key of the created contract, if defined. Optional
create_arguments	Record		The arguments that have been used to create the contract. Required
witness_parties	string	repeated	The parties that are notified of this event. For CreatedEvent`s, these are the intersection of the stakeholders of the contract in question and the parties specified in the `TransactionFilter. The stakeholders are the union of the signatories and the observers of the contract. Required
signatories	string	repeated	The signatories for this contract as specified by the template. Required
observers	string	repeated	The observers for this contract as specified explicitly by the template or implicitly as choice controllers. Required
agreement_text	google.protobuf.StringValue		The agreement text of the contract. We use StringValue to properly reflect optionality on the wire for backwards compatibility. This is necessary since the empty string is an acceptable (and in fact the default) agreement text, but also the default string in protobuf. This means a newer client works with an older sandbox seamlessly. Optional

Event¶

An event in the flat transaction stream can either be the creation or the archiving of a contract.

In the transaction service the events are restricted to the events visible for the parties specified in the transaction filter. Each event message type below contains a witness_parties field which indicates the subset of the requested parties that can see the event in question. In the flat transaction stream you’ll only receive events that have witnesses.

Field	Type	Label	Description
created	CreatedEvent
archived	ArchivedEvent

ExercisedEvent¶

Records that a choice has been exercised on a target contract.

Field	Type	Label	Description
event_id	string		The ID of this particular event. Must be a valid LedgerString (as described in `value.proto`). Required
contract_id	string		The ID of the target contract. Must be a valid LedgerString (as described in `value.proto`). Required
template_id	Identifier		The template of the target contract. Required
choice	string		The choice that’s been exercised on the target contract. Must be a valid NameString (as described in `value.proto`). Required
choice_argument	Value		The argument the choice was made with. Required
acting_parties	string	repeated	The parties that made the choice. Each element must be a valid PartyIdString (as described in `value.proto`). Required
consuming	bool		If true, the target contract may no longer be exercised. Required
witness_parties	string	repeated	The parties that are notified of this event. The witnesses of an exercise node will depend on whether the exercise was consuming or not. If consuming, the witnesses are the union of the stakeholders and the actors. If not consuming, the witnesses are the union of the signatories and the actors. Note that the actors might not necessarily be observers and thus signatories. This is the case when the controllers of a choice are specified using “flexible controllers”, using the choice … controller syntax, and said controllers are not explicitly marked as observers. Each element must be a valid PartyIdString (as described in `value.proto`). Required
child_event_ids	string	repeated	References to further events in the same transaction that appeared as a result of this `ExercisedEvent`. It contains only the immediate children of this event, not all members of the subtree rooted at this node. Each element must be a valid LedgerString (as described in `value.proto`). Optional
exercise_result	Value		The result of exercising the choice Required

com/digitalasset/ledger/api/v1/ledger_configuration_service.proto¶

GetLedgerConfigurationRequest¶

Field	Type	Label	Description
ledger_id	string		Must correspond to the ledger ID reported by the Ledger Identification Service. Must be a valid LedgerString (as described in `value.proto`). Required
trace_context	TraceContext		Server side tracing will be registered as a child of the submitted context. This field is a future extension point and is currently not supported. Optional

GetLedgerConfigurationResponse¶

Field	Type	Label	Description
ledger_configuration	LedgerConfiguration		The latest ledger configuration.

LedgerConfiguration¶

LedgerConfiguration contains parameters of the ledger instance that may be useful to clients.

Field	Type	Label	Description
min_ttl	google.protobuf.Duration		Minimum difference between ledger effective time and maximum record time in submitted commands.
max_ttl	google.protobuf.Duration		Maximum difference between ledger effective time and maximum record time in submitted commands.

LedgerConfigurationService¶

LedgerConfigurationService allows clients to subscribe to changes of the ledger configuration.

Method name	Request type	Response type	Description
GetLedgerConfiguration	GetLedgerConfigurationRequest	GetLedgerConfigurationResponse	Returns the latest configuration as the first response, and publishes configuration updates in the same stream.

com/digitalasset/ledger/api/v1/ledger_identity_service.proto¶

GetLedgerIdentityRequest¶

Field	Type	Label	Description
trace_context	TraceContext		Server side tracing will be registered as a child of the submitted context. This field is a future extension point and is currently not supported. Optional

GetLedgerIdentityResponse¶

Field	Type	Label	Description
ledger_id	string		The ID of the ledger exposed by the server. Requests submitted with the wrong ledger ID will result in `NOT_FOUND` gRPC errors. Must be a valid LedgerString (as described in `value.proto`). Required

LedgerIdentityService¶

Allows clients to verify that the server they are communicating with exposes the ledger they wish to operate on. Note that every ledger has a unique ID.

Method name	Request type	Response type	Description
GetLedgerIdentity	GetLedgerIdentityRequest	GetLedgerIdentityResponse	Clients may call this RPC to return the identifier of the ledger they are connected to.

com/digitalasset/ledger/api/v1/ledger_offset.proto¶

LedgerOffset¶

Describes a specific point on the ledger.

Field	Type	Label	Description
absolute	string		Absolute values are acquired by reading the transactions in the stream. The offsets can be compared. The format may vary between implementations. It is either a string representing an ever-increasing integer, or a composite string containing `<block-hash>-<block-height>-<event-id>`; ordering requires comparing numerical values of the second, then the third element.
boundary	LedgerOffset.LedgerBoundary

LedgerOffset.LedgerBoundary¶

Name	Number	Description
LEDGER_BEGIN	0	Refers to the first transaction.
LEDGER_END	1	Refers to the currently last transaction, which is a moving target.

com/digitalasset/ledger/api/v1/package_service.proto¶

GetPackageRequest¶

Field	Type	Description
ledger_id	string	Must correspond to the ledger ID reported by the Ledger Identification Service. Must be a valid LedgerString (as described in `value.proto`). Required
package_id	string	The ID of the requested package. Must be a valid PackageIdString (as described in `value.proto`). Required
trace_context	TraceContext	Server side tracing will be registered as a child of the submitted context. This field is a future extension point and is currently not supported. Optional

GetPackageResponse¶

Field	Type	Description
hash_function	HashFunction	The hash function we use to calculate the hash. Required
archive_payload	bytes	Contains a `daml_lf` ArchivePayload. See further details in `daml_lf.proto`. Required
hash	string	The hash of the archive payload, can also used as a `package_id`. Must be a valid PackageIdString (as described in `value.proto`). Required

GetPackageStatusRequest¶

Field	Type	Description
ledger_id	string	Must correspond to the ledger ID reported by the Ledger Identification Service. Must be a valid LedgerString (as described in `value.proto`). Required
package_id	string	The ID of the requested package. Must be a valid PackageIdString (as described in `value.proto`). Required
trace_context	TraceContext	Server side tracing will be registered as a child of the submitted context. This field is a future extension point and is currently not supported. Optional

GetPackageStatusResponse¶

Field	Type	Label	Description
package_status	PackageStatus		The status of the package.

ListPackagesRequest¶

Field	Type	Label	Description
ledger_id	string		Must correspond to the ledger ID reported by the Ledger Identification Service. Must be a valid LedgerString (as described in `value.proto`). Required
trace_context	TraceContext		Server side tracing will be registered as a child of the submitted context. This field is a future extension point and is currently not supported. Optional

ListPackagesResponse¶

Field	Type	Label	Description
package_ids	string	repeated	The IDs of all DAML-LF packages supported by the server. Each element must be a valid PackageIdString (as described in `value.proto`). Required

HashFunction¶

Name	Number	Description
SHA256	0

PackageStatus¶

Name	Number	Description
UNKNOWN	0	The server is not aware of such a package.
REGISTERED	1	The server is able to execute DAML commands operating on this package.

PackageService¶

Allows clients to query the DAML-LF packages that are supported by the server.

Method name	Request type	Response type	Description
ListPackages	ListPackagesRequest	ListPackagesResponse	Returns the identifiers of all supported packages.
GetPackage	GetPackageRequest	GetPackageResponse	Returns the contents of a single package, or a `NOT_FOUND` error if the requested package is unknown.
GetPackageStatus	GetPackageStatusRequest	GetPackageStatusResponse	Returns the status of a single package.

com/digitalasset/ledger/api/v1/testing/reset_service.proto¶

ResetRequest¶

Field	Type	Label	Description
ledger_id	string		Must correspond to the ledger ID reported by the Ledger Identification Service. Must be a valid LedgerString (as describe in `value.proto`). Required

ResetService¶

Service to reset the ledger state. The goal here is to be able to reset the state in a way that’s much faster compared to restarting the whole ledger application (be it a sandbox or the real ledger server).

Note that all state present in the ledger implementation will be reset, most importantly including the ledger ID. This means that clients will have to re-fetch the ledger ID from the identity service after hitting this endpoint.

The semantics are as follows:

When the reset service returns the reset is initiated, but not completed;
While the reset is performed, the ledger will not accept new requests. In fact we guarantee that ledger stops accepting new requests by the time the response to Reset is delivered;
In-flight requests might be aborted, we make no guarantees on when or how quickly this happens;
The ledger might be unavailable for a period of time before the reset is complete.

Given the above, the recommended mode of operation for clients of the reset endpoint is to call it, then call the ledger identity endpoint in a retry loop that will tolerate a brief window when the ledger is down, and resume operation as soon as the new ledger ID is delivered.

Note that this service will be available on the sandbox and might be available in some other testing environments, but will never be available in production.

Method name	Request type	Response type	Description
Reset	ResetRequest	.google.protobuf.Empty	Resets the ledger state. Note that loaded DARs won’t be removed – this only rolls back the ledger to genesis.

com/digitalasset/ledger/api/v1/testing/time_service.proto¶

GetTimeRequest¶

Field	Type	Label	Description
ledger_id	string		Must correspond to the ledger ID reported by the Ledger Identification Service. Must be a valid LedgerString (as describe in `value.proto`). Required

GetTimeResponse¶

Field	Type	Label	Description
current_time	google.protobuf.Timestamp		The current time according to the ledger server.

SetTimeRequest¶

Field	Type	Description
ledger_id	string	Must correspond to the ledger ID reported by the Ledger Identification Service. Must be a valid LedgerString (as describe in `value.proto`). Required
current_time	google.protobuf.Timestamp	MUST precisely match the current time as it’s known to the ledger server. On mismatch, an `INVALID_PARAMETER` gRPC error will be returned.
new_time	google.protobuf.Timestamp	The time the client wants to set on the ledger. MUST be a point int time after `current_time`.

TimeService¶

Optional service, exposed for testing static time scenarios.

Method name	Request type	Response type	Description
GetTime	GetTimeRequest	GetTimeResponse	Returns a stream of time updates. Always returns at least one response, where the first one is the current time. Subsequent responses are emitted whenever the ledger server’s time is updated.
SetTime	SetTimeRequest	.google.protobuf.Empty	Allows clients to change the ledger’s clock in an atomic get-and-set operation.

com/digitalasset/ledger/api/v1/trace_context.proto¶

TraceContext¶

Data structure to propagate Zipkin trace information. See https://github.com/openzipkin/b3-propagation Trace identifiers are 64 or 128-bit, but all span identifiers within a trace are 64-bit. All identifiers are opaque.

Field	Type	Description
trace_id_high	uint64	If present, this is the high 64 bits of the 128-bit identifier. Otherwise the trace ID is 64 bits long.
trace_id	uint64	The TraceId is 64 or 128-bit in length and indicates the overall ID of the trace. Every span in a trace shares this ID.
span_id	uint64	The SpanId is 64-bit in length and indicates the position of the current operation in the trace tree. The value should not be interpreted: it may or may not be derived from the value of the TraceId.
parent_span_id	google.protobuf.UInt64Value	The ParentSpanId is 64-bit in length and indicates the position of the parent operation in the trace tree. When the span is the root of the trace tree, the ParentSpanId is absent.
sampled	bool	When the sampled decision is accept, report this span to the tracing system. When it is reject, do not. When B3 attributes are sent without a sampled decision, the receiver should make one. Once the sampling decision is made, the same value should be consistently sent downstream.

com/digitalasset/ledger/api/v1/transaction.proto¶

Transaction¶

Filtered view of an on-ledger transaction.

Field	Type	Label	Description
transaction_id	string		Assigned by the server. Useful for correlating logs. Must be a valid LedgerString (as described in `value.proto`). Required
command_id	string		The ID of the command which resulted in this transaction. Missing for everyone except the submitting party. Must be a valid LedgerString (as described in `value.proto`). Optional
workflow_id	string		The workflow ID used in command submission. Must be a valid LedgerString (as described in `value.proto`). Optional
effective_at	google.protobuf.Timestamp		Ledger effective time. Must be a valid LedgerString (as described in `value.proto`). Required
events	Event	repeated	The collection of events. Only contains `CreatedEvent` or `ArchivedEvent`. Required
offset	string		The absolute offset. The format of this field is described in `ledger_offset.proto`. Required
trace_context	TraceContext		Zipkin trace context. This field is a future extension point and is currently not supported. Optional

TransactionTree¶

Complete view of an on-ledger transaction.

Field	Type	Label	Description
transaction_id	string		Assigned by the server. Useful for correlating logs. Must be a valid LedgerString (as described in `value.proto`). Required
command_id	string		The ID of the command which resulted in this transaction. Missing for everyone except the submitting party. Must be a valid LedgerString (as described in `value.proto`). Optional
workflow_id	string		The workflow ID used in command submission. Only set if the `workflow_id` for the command was set. Must be a valid LedgerString (as described in `value.proto`). Optional
effective_at	google.protobuf.Timestamp		Ledger effective time. Required
offset	string		The absolute offset. The format of this field is described in `ledger_offset.proto`. Required
events_by_id	TransactionTree.EventsByIdEntry	repeated	Changes to the ledger that were caused by this transaction. Nodes of the transaction tree. Each key be a valid LedgerString (as describe in `value.proto`). Required
root_event_ids	string	repeated	Roots of the transaction tree. Each element must be a valid LedgerString (as describe in `value.proto`). The elements are in the same order as the commands in the corresponding Commands object that triggerd this transaction. Required
trace_context	TraceContext		Zipkin trace context. This field is a future extension point and is currently not supported. Optional

TransactionTree.EventsByIdEntry¶

Field	Type	Label	Description
key	string
value	TreeEvent

TreeEvent¶

Each tree event message type below contains a witness_parties field which indicates the subset of the requested parties that can see the event in question.

Note that transaction trees might contain events with _no_ witness parties, which were included simply because they were children of events which have witnesses.

Field	Type	Label	Description
created	CreatedEvent
exercised	ExercisedEvent

com/digitalasset/ledger/api/v1/transaction_filter.proto¶

Filters¶

Field	Type	Label	Description
inclusive	InclusiveFilters		If not set, no filters will be applied. Optional

InclusiveFilters¶

If no internal fields are set, no data will be returned.

Field	Type	Label	Description
template_ids	Identifier	repeated	A collection of templates. SHOULD NOT contain duplicates. Required

TransactionFilter¶

Used for filtering Transaction and Active Contract Set streams. Determines which on-ledger events will be served to the client.

Field	Type	Label	Description
filters_by_party	TransactionFilter.FiltersByPartyEntry	repeated	Keys of the map determine which parties’ on-ledger transactions are being queried. Values of the map determine which events are disclosed in the stream per party. At the minimum, a party needs to set an empty Filters message to receive any events. Each key must be a valid PartyIdString (as described in `value.proto`). Required

TransactionFilter.FiltersByPartyEntry¶

Field	Type	Label	Description
key	string
value	Filters

com/digitalasset/ledger/api/v1/transaction_service.proto¶

GetFlatTransactionResponse¶

Field	Type	Label	Description
transaction	Transaction

GetLedgerEndRequest¶

Field	Type	Label	Description
ledger_id	string		Must correspond to the ledger ID reported by the Ledger Identification Service. Must be a valid LedgerString (as describe in `value.proto`). Required
trace_context	TraceContext		Server side tracing will be registered as a child of the submitted context. This field is a future extension point and is currently not supported. Optional

GetLedgerEndResponse¶

Field	Type	Label	Description
offset	LedgerOffset		The absolute offset of the current ledger end.

GetTransactionByEventIdRequest¶

Field	Type	Label	Description
ledger_id	string		Must correspond to the ledger ID reported by the Ledger Identification Service. Must be a valid LedgerString (as described in `value.proto`). Required
event_id	string		The ID of a particular event. Must be a valid LedgerString (as described in `value.proto`). Required
requesting_parties	string	repeated	The parties whose events the client expects to see. Events that are not visible for the parties in this collection will not be present in the response. Each element must be a valid PartyIdString (as described in `value.proto`). Required
trace_context	TraceContext		Server side tracing will be registered as a child of the submitted context. This field is a future extension point and is currently not supported. Optional

GetTransactionByIdRequest¶

Field	Type	Label	Description
ledger_id	string		Must correspond to the ledger ID reported by the Ledger Identification Service. Must be a valid LedgerString (as describe in `value.proto`). Required
transaction_id	string		The ID of a particular transaction. Must be a valid LedgerString (as describe in `value.proto`). Required
requesting_parties	string	repeated	The parties whose events the client expects to see. Events that are not visible for the parties in this collection will not be present in the response. Each element be a valid PartyIdString (as describe in `value.proto`). Required
trace_context	TraceContext		Server side tracing will be registered as a child of the submitted context. This field is a future extension point and is currently not supported. Optional

GetTransactionResponse¶

Field	Type	Label	Description
transaction	TransactionTree

GetTransactionTreesResponse¶

Field	Type	Label	Description
transactions	TransactionTree	repeated	The list of transaction trees that matches the filter in `GetTransactionsRequest` for the `GetTransactionTrees` method.

GetTransactionsRequest¶

Field	Type	Description
ledger_id	string	Must correspond to the ledger ID reported by the Ledger Identification Service. Must be a valid LedgerString (as described in `value.proto`). Required
begin	LedgerOffset	Beginning of the requested ledger section. Required
end	LedgerOffset	End of the requested ledger section. Optional, if not set, the stream will not terminate.
filter	TransactionFilter	Requesting parties with template filters. Required
verbose	bool	If enabled, values served over the API will contain more information than strictly necessary to interpret the data. In particular, setting the verbose flag to true triggers the ledger to include labels for record fields. Optional
trace_context	TraceContext	Server side tracing will be registered as a child of the submitted context. This field is a future extension point and is currently not supported. Optional

GetTransactionsResponse¶

Field	Type	Label	Description
transactions	Transaction	repeated	The list of transactions that matches the filter in GetTransactionsRequest for the GetTransactions method.

TransactionService¶

Allows clients to read transactions from the ledger.

Method name	Request type	Response type	Description
GetTransactions	GetTransactionsRequest	GetTransactionsResponse	Read the ledger’s filtered transaction stream for a set of parties.
GetTransactionTrees	GetTransactionsRequest	GetTransactionTreesResponse	Read the ledger’s complete transaction tree stream for a set of parties.
GetTransactionByEventId	GetTransactionByEventIdRequest	GetTransactionResponse	Lookup a transaction tree by the ID of an event that appears within it. Returns `NOT_FOUND` if no such transaction exists. For looking up a transaction instead of a transaction tree, please see GetFlatTransactionByEventId
GetTransactionById	GetTransactionByIdRequest	GetTransactionResponse	Lookup a transaction tree by its ID. Returns `NOT_FOUND` if no such transaction exists. For looking up a transaction instead of a transaction tree, please see GetFlatTransactionById
GetFlatTransactionByEventId	GetTransactionByEventIdRequest	GetFlatTransactionResponse	Lookup a transaction by the ID of an event that appears within it. Returns `NOT_FOUND` if no such transaction exists.
GetFlatTransactionById	GetTransactionByIdRequest	GetFlatTransactionResponse	Lookup a transaction by its ID. Returns `NOT_FOUND` if no such transaction exists.
GetLedgerEnd	GetLedgerEndRequest	GetLedgerEndResponse	Get the current ledger end. Subscriptions started with the returned offset will serve transactions created after this RPC was called.

com/digitalasset/ledger/api/v1/value.proto¶

Enum¶

A value with finite set of alternative representations.

Field	Type	Label	Description
enum_id	Identifier		Omitted from the transaction stream when verbose streaming is not enabled. Optional when submitting commands.
constructor	string		Determines which of the Variant’s alternatives is encoded in this message. Must be a valid NameString. Required

GenMap¶

Field	Type	Label	Description
entries	GenMap.Entry	repeated

GenMap.Entry¶

Field	Type	Label	Description
key	Value
value	Value

Identifier¶

Unique identifier of an entity.

Field	Type	Description
package_id	string	The identifier of the DAML package that contains the entity. Must be a valid PackageIdString. Required
module_name	string	The dot-separated module name of the identifier. Required
entity_name	string	The dot-separated name of the entity (e.g. record, template, …) within the module. Required

List¶

A homogenous collection of values.

Field	Type	Label	Description
elements	Value	repeated	The elements must all be of the same concrete value type. Optional

Map¶

Field	Type	Label	Description
entries	Map.Entry	repeated

Map.Entry¶

Field	Type	Label	Description
key	string
value	Value

Optional¶

Corresponds to Java’s Optional type, Scala’s Option, and Haskell’s Maybe. The reason why we need to wrap this in an additional message is that we need to be able to encode the None case in the Value oneof.

Field	Type	Label	Description
value	Value		optional

Record¶

Contains nested values.

Field	Type	Label	Description
record_id	Identifier		Omitted from the transaction stream when verbose streaming is not enabled. Optional when submitting commands.
fields	RecordField	repeated	The nested values of the record. Required

RecordField¶

A named nested value within a record.

Field	Type	Label	Description
label	string		When reading a transaction stream, it’s omitted if verbose streaming is not enabled. When submitting a commmand, it’s optional: - if all keys within a single record are present, the order in which fields appear does not matter. however, each key must appear exactly once. - if any of the keys within a single record are omitted, the order of fields MUST match the order of declaration in the DAML template. Must be a valid NameString
value	Value		A nested value of a record. Required

Value¶

Encodes values that the ledger accepts as command arguments and emits as contract arguments.

The values encoding use different four classes of strings as identifiers. Those classes are defined as follow: - NameStrings are strings that match the regexp [A-Za-z\$_][A-Za-z0-9\$_]*. - PackageIdStrings are strings that match the regexp [A-Za-z0-9\-_ ]+. - PartyIdStrings are strings that match the regexp [A-Za-z0-9:\-_ ]+. - LedgerStrings are strings that match the regexp [A-Za-z0-9#:\-_/ ]+.

Field	Type	Description
record	Record
variant	Variant
contract_id	string	Identifier of an on-ledger contract. Commands which reference an unknown or already archived contract ID will fail. Must be a valid LedgerString.
list	List	Represents a homogeneous list of values.
int64	sint64
numeric	string	A Numeric, that is a decimal value with precision 38 (at most 38 significant digits) and a scale between 0 and 37 (significant digits on the right of the decimal point). The field has to match the regex [+-]?d{1,38}(.d{0,37})? and should be representable by a Numeric without loss of precision.
text	string	A string.
timestamp	sfixed64	Microseconds since the UNIX epoch. Can go backwards. Fixed since the vast majority of values will be greater than 2^28, since currently the number of microseconds since the epoch is greater than that. Range: 0001-01-01T00:00:00Z to 9999-12-31T23:59:59.999999Z, so that we can convert to/from https://www.ietf.org/rfc/rfc3339.txt
party	string	An agent operating on the ledger. Must be a valid PartyIdString.
bool	bool	True or false.
unit	google.protobuf.Empty	This value is used for example for choices that don’t take any arguments.
date	int32	Days since the unix epoch. Can go backwards. Limited from 0001-01-01 to 9999-12-31, also to be compatible with https://www.ietf.org/rfc/rfc3339.txt
optional	Optional	The Optional type, None or Some
map	Map	The Map type
enum	Enum	The Enum type
gen_map	GenMap	The GenMap type

Variant¶

A value with alternative representations.

Field	Type	Description
variant_id	Identifier	Omitted from the transaction stream when verbose streaming is not enabled. Optional when submitting commands.
constructor	string	Determines which of the Variant’s alternatives is encoded in this message. Must be a valid NameString. Required
value	Value	The value encoded within the Variant. Required

Scalar Value Types¶

.proto type	Notes	C++ type	Java type	Python type
double		double	double	float
float		float	float	float
int32	Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint32 instead.	int32	int	int
int64	Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint64 instead.	int64	long	int/long
uint32	Uses variable-length encoding.	uint32	int	int/long
uint64	Uses variable-length encoding.	uint64	long	int/long
sint32	Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int32s.	int32	int	int
sint64	Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int64s.	int64	long	int/long
fixed32	Always four bytes. More efficient than uint32 if values are often greater than 2^28.	uint32	int	int
fixed64	Always eight bytes. More efficient than uint64 if values are often greater than 2^56.	uint64	long	int/long
sfixed32	Always four bytes.	int32	int	int
sfixed64	Always eight bytes.	int64	long	int/long
bool		bool	boolean	boolean
string	A string must always contain UTF-8 encoded or 7-bit ASCII text.	string	String	str/unicode
bytes	May contain any arbitrary sequence of bytes.	string	ByteString	str