Iroha 2 requirements

• List of preconditions which must be satisfied before the use case can be applied
• Each precondition should be defined as the point in the list

Use case flow

1. The enumerated list of actions, which describes the interaction between actors step by step
2. Each step should involve a single actor as an object of the action
3. Each step can involve one or more actors as a subject of the action
4. Each use case can involve other use cases as dependencies by include or extend relationships

• One or more results of successfully finished use case

• List of alternative flows that can happen with the use case.
• Each entry should have the link to the step of the main use case flow when the alternative can occur
  • If needed, each entry can contain sub-entries
• Each entry should describe the consequences of the alternative flow

• List of exceptions that can happen during the use case flow, which can prevent it to be successfully finished
• Each entry should have the link to the step of the main use case flow when the exception can occur
  • If needed, each entry can contain sub-entries
• Each entry should describe the consequences of the exception

• The administrator has configured environment for running Iroha executables
• The administrator has prepared the genesis block

Use case flow

1. The administrator launches the command to run Iroha peer and providing the path to the genesis block description
2. The Iroha peer read and validates the genesis block configuration
3. The Iroha peer starts the Iroha network according to the configuration in the genesis block
4. The Iroha peer provides "successfully started" report to the administrator

• The Iroha network is running
• The administrator has access to the root account of the network

• At step 2, in case of the invalid genesis block, the Iroha peer shows corresponding error messages to the administrator and halts the network creation process

Use case flow

Use case flow

Use case flow

• The user has an account in the Iroha network
• The user has prepared the command
• The user has permissions to execute the instruction
• The Iroha network is working in normal condition

Use case flow

1. The user sends the instruction to the Iroha peer through the API
2. The Iroha peer receives the instruction and validates its contents
3. The Iroha peer checks that the user's account have enough permissions to run the instruction
4. The Iroha peer executes the instruction by applying it to the current block
5. The Iroha peer returns the result of the operation to the user

• The instruction is successfully executed and applied to the network state

• On step 4, if the current user's account is multi-signature, the result of instruction will be applied to the block-store only when the number of signatures will reach the current quorum value. In other case, the Iroha peer will return "pending" status as a response on step 5.

• On step 2, of the instruction has invalid structure, the Iroha peer returns an error message with description to the users and stops the flow
• On step 3, if the user's account does not have required permissions, the Iroha peer returns information about that error and stops the flow

• The user has permission to create other users

Use case flow

1. The user prepares information about the account that should be created, which includes name, domain, the public key and permissions list
2. The user prepares instruction to send to the Iroha network according to the prepared information
3. The user sends the instruction to the Iroha peer (includes FR0100)
4. Tha Iroha peer returns the result of the instruction execution to the user

• The new account in the Iroha network is created

Use case flow

• The user has access to his/her account in the Iroha network
• The user's account has permissions to provide grantable permissions

Use case flow

1. The user prepares the instruction to grant one or more permissions to another account
2. The user sends the instruction with the prepared instruction to the Iroha peer (<<includes>> FR0100)
3. The Iroha peer returns the result of the instruction to the user

• The permission was granted to another account

Use case flow

• The user has permissions to execute requested instruction

Use case flow

1. The user prepares the instruction parameters according to his/her needs
2. The user sends the instruction into the Iroha peer (<<includes>> FR0100)
3. The user uses the same connection for obtaining the status of the instruction finalization
4. The Iroha peer sends updates about the instruction finalization status to the user
5. The user receives the "successfully finalized" status about the instruction

• The instruction is accepted and finalized in the block-storage
• The user did not spend additional resources for redundant network connections and requests

• At step 4 if the instruction cannot pass the validation, the user would not get the "successfully finalized" status; instead, he/she will get the "invalid instruction" status.
• At step 4 if the network is in "bad" condition, the user would get the "successfully finalized" status eventually, when the network will return in a "good" state.

Use case flow

Use case flow

Use case flow