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@maci-protocol/core
Advanced tools
maci-core
This submodule assists with handling key business logic functions and processes.
One may conceive of MACI as a state machine with 1) data and 2) functions which transform said data. This makes it easier to reason about the system, write tests, and implement functionality. It also allows us to implement the smart contracts in discrete components which are easy to test.
To this end, this submodule exposes a MaciState
class and a Poll
class.
Developers should instantiate objects from these classes to test MACI. For
instance, MACI.test.ts
creates a
MaciState
object and every time it interacts with the MACI smart contract, it
mirrors said interaction on the MaciState
and Poll
. As such, the developer
can then use their helper functions like maciState.signUp()
,
poll.publishMessage
, poll.processMessages()
, and poll.tallyVotes()
to
step through the various stages of the MACI flow.
MaciState
signUp
Accepts a user's public key and creates a new state leaf and ballot leaf.
In testing, whenever a test suite submits a signUp()
transaction, it should
call maciState.signUp()
as well, so that the off-chain representation of MACI
is kept up to date.
In production, genMaciStateFromContract()
in
genMaciState.ts
uses this function when it
scans a MACI contract's event log for signups, so as to bring its MaciState
instance up to date.
deployPoll
Creates a new Poll
. This should be done whenever the MACI contract's
deployPoll()
function is called.
copy
A function that deep-copies an object.
stateTree
stateTree
is a quinary Merkle tree, chosen over a binary tree due to the gas and circuit constraints associated with the Poseidon hash function (details here). Each leaf in this tree represents a participant's public key, their voice credit balance and the block timestamp at which they signed up. The tree features a configurable depth and an arity of five, with insertions starting at index 1. The zeroth leaf is reserved as a security measure against denial-of-service attacks.
Poll
A Poll
is an off-chain representation of a Poll. In testing, Poll
instances
should mirror their on-chain counterparts.
publishMessage
Publishes a message by updating the message tree and message accumulation queue.
processMessages
Processes a batch of messages and returns the inputs to the processMessages
circuit which can be used to prove correct execution.
tallyVotes
Tallies a batch of votes and returns the inputs to the tallyVotes
circuit which can be used to prove correct execution.
copy
Deep-copies and returns this object.
messageTree
messageTree
is also a quinary Merkle tree. Each message in this tree represents an encrypted command, such as a user casting a vote in a poll or changing their public key.
For more details about testing please refer to the tests documentation.
ts/
: The home for our core classes, MaciState
and Poll
ts/utls/
: Contains supporting utilitiests/__tests__/
: A dedicated test suite directoryFAQs
The MACI state machine implemented in TypeScript
The npm package @maci-protocol/core receives a total of 854 weekly downloads. As such, @maci-protocol/core popularity was classified as not popular.
We found that @maci-protocol/core demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 3 open source maintainers collaborating on the project.
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