A simple forum, messaging and voting system for EOS

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The purpose of this contract is to support the EOS Referendum system by storing proposals and their related votes in-RAM in the blockchain's state.

It's also possible to create related posts and statuses, but they are not stored in-RAM in the blockchain's state. It allows authenticated messages to go through, where they are visible in the transaction history of the chain. Off-chain tools are needed to sort, display, aggregate, and report on the outputs of the post and status actions.

Lifecycle

The propose action is first called providing the proposer's account, proposal's name (its id among all other proposals), proposal's title, a JSON string for extra metadata (specification not defined yet) that can be left empty, and an expiration date (must be no later than 6 months in the future).

Once the proposal has been created, people can start to vote on it via the vote action. The vote action is called using the voter's account, proposal's name, vote's value (0 for negative vote and 1 for a positive vote) and a JSON string for extra metadata (specification not defined yet), which can be left empty.

A vote overwrites any previous value if present. That means that if you voted initially with a vote value of 0 (negative vote) and you perform a second vote action on the same proposal this time with a value of 1 (positive vote), your current vote for the proposal is now 1.

There is no decay once you have voted. Once you vote, it does not change, nor is it removed until you either call unvote, or the proposal has been cleaned up by the clnproposal action.

Once a vote has been cast, a user can remove its vote via the unvote action. The unvote action is called using the voter's account and proposal's name. An unvote action completely removes your vote from the proposal and clears the RAM usage associated to that vote.

While a proposal is still active a proposer can decide to manually expire it by calling the expire action which receives as its only argument the proposal_name. This amends the proposal's expires_at field to the current time instead of waiting for its original expiration date to be reached.

Once a proposal is expired (be it manually or automatically if it passed its expiration date), the proposal enters a 3 day freeze period. Within this freeze period, the proposal is locked and no actions can be called on it (no vote changes, no vote removal (unvote) and no clean up). This is to allow a period where multiple tools can query the results for cross-verification. Once a proposal has ended its freeze period, it's now possible to clean it via the clnproposal action. The clnproposal action receives the proposal_name and a max_count value. clnproposal is done in batch, each batch removing an amount of votes on the proposal (received via the max_count variable). Once all votes are removed on a proposal, the proposal itself is removed.

The clean proposal effectively reclaims all RAM consumed for votes and for the proposal itself. The RAM is thus given back to voters (for their votes) and to the proposer (for the proposal).

The clnproposal action can be called by anybody, there are no restrictions. There is no risk since only expired proposals that have passed their freeze period can be cleaned. Thus, no issues can arise by cleaning proposals.

Development

Prerequisites:

• Docker 17+
• eosc 1.1+
• eos-bios 1.2+

We assume the docker binary is available in your PATH environment as well as eosc and eos-bios. The eos-bios and eosc binaries are required to correctly boot the local development & test node as well as running the automated test suite.

Building

Simply call the build.sh script which launches a Docker container and compiles the contract:

./build.sh

Running

You can easily start a development node using the run.sh script, which uses eos-bios and Docker to launch a fully configured sandboxed nodeos development node:

./run.sh

This creates the following accounts:

• eosforumrcpp
• proposer1
• proposer2
• poster1
• poster2
• voter1
• voter2
• zzzzzzzzzzzz

All accounts created in the development node above use the following public/private key pair:

• Public: EOS5MHPYyhjBjnQZejzZHqHewPWhGTfQWSVTWYEhDmJu4SXkzgweP
• Private: 5JpjqdhVCQTegTjrLtCSXHce7c9M8w7EXYZS7xC13jVFF4Phcrx

You can pre-fill your environment with some proposals and votes easily by simply calling the ./tests/data.sh script.

./tests/data.sh

Once you are done with the nodeos development node, simply call stop.sh to stop the running instance:

./stop.sh

Environment

To easily interact with the development node via eosc on your terminal, simply export the following environment variables:

export EOSC_GLOBAL_INSECURE_VAULT_PASSPHRASE="secure"
export EOSC_GLOBAL_API_URL="http://localhost:9898"
export EOSC_GLOBAL_VAULT_FILE="`pwd`/tests/eosc-vault.json"

The direnv tool can be used to automatically import those variables when you cd in the project's root directory.

Tests

Running the full automatic test suite is easy as doing:

./tests.sh

This launches nodeos development node (via ./run.sh) and then executes all the integration tests found in tests folder (see all.sh for exact files picked up).

To correctly run the tests, you will need to switch the freeze period of a proposal for 2 seconds (waiting 3 days could be a bit too long!)

In the file include/forum.hpp, change the line:

constexpr static uint32_t FREEZE_PERIOD_IN_SECONDS = 3 * 24 * 60 * 60;

So it looks like this instead:

constexpr static uint32_t FREEZE_PERIOD_IN_SECONDS = 2; // NEVER MERGE LIKE THIS

The test.sh script refuses to run if the string is not found in the file.

Important Be 100% sure to revert back the changes, you would not like to push a freeze period of 2 seconds in the repository!

Deployment

The latest version of this code lives on the eosforumrcpp account on the EOS Mainnet and on the cancancan345 account on the EOS Kylin network.

Tools that initially integrated support for this contract are:

• eosc has a command-line interface implementation to submit posts and votes.
• EOS ToolKit Forum Post allows you to post content through this contract.
• MyEOSKit already has special casing for the post actions. See this transaction for example.

Reference

Here is the list of possible actions:

• propose
• expire
• vote
• unvote
• clnproposal
• post
• unpost
• status

Action propose

Propose a new proposal to the community.

Parameters

• proposer (type account_name) - The actual proposer's account
• proposal_name (type name) - The proposal's name, its ID among all proposals
• title (type string) - The proposal's title (must be less than 1024 characters)
• proposal_json (type string) - The proposal's JSON metadata, no specification yet, see JSON Structure Guidelines
• expires_at (type time_point_sec) - The expiration date of the proposal, must be no later than 6 months in the future, ISO 8601 string format (in UTC) without a timezone modifier.

Rejections

• When missing signature of proposer
• When proposal_name already exists
• When title is longer than 1024 characters
• When proposal_json JSON is invalid or too large (must be a JSON object and be less than 32768 characters)
• When expires_at date is earlier than now or later than 6 months in the future

Example

eosc tx create eosforumrcpp propose '{"proposer": "proposer1", "proposal_name": "example", "title": "The title, for list views", "proposal_json": "", "expires_at": "2019-01-30T17:03:20"}' -p proposer1@active

OR

eosc forum propose proposer1 example "The title, for list views" 2019-01-30T17:03:20 --json "[JSON object]"

Action vote

Vote for a given proposal using your account.

Parameters

• voter (type account_name) - The actual voter's account
• proposal_name (type name) - The proposal's name to vote on
• vote (type uint8) - Your vote on the proposal, 0 means a negative vote, 1 means a positive vote
• vote_json (type string) - The vote's JSON metadata, no specification yet, see JSON Structure Guidelines

Rejections

• When missing signature of voter
• When proposal_name does not exist
• When proposal_name is already expired
• When the vote_json JSON is invalid or too large (must be a JSON object and be less than 8192 characters)

Example

eosc tx create eosforumrcpp vote '{"voter": "voter1", "proposal_name": "example", "vote": 0, "vote_json": ""}' -p voter1@active

OR

eosc forum vote voter1 example 0

Action unvote

Remove your current active vote, effectively reclaiming the stored RAM of the vote. Of course, your vote will not count anymore (neither positively or negatively) on the current proposal's voting statistics.

It's not possible to unvote on a proposal that is expired but within its freeze period of 3 days. If the proposal is expired and the freeze period has elapsed, it's possible to unvote on the proposal. To be nice to the community however, you should call clnproposal until the proposal is fully cleaned up so that every vote will be removed and RAM will be freed for all voters.

Parameters

• voter (type account_name) - The actual voter's account
• proposal_name (type name) - The proposal's name to remove your vote from

Rejections

• When missing signature of voter
• When proposal_name does not exist
• When proposal_name is expired but within its freeze period of 3 days

Example

eosc tx create eosforumrcpp unvote '{"voter": "voter1", "proposal_name": "example"}' -p voter1@active

OR

eosc forum unvote voter1 example

Action expire

Immediately expires a currently active proposal. The proposal can only be expired by the original proposer that created it. It's not valid to expire an already expired proposal.

Parameters

• proposal_name (type name) - The proposal's name to expire

Rejections

• When missing signatures of proposal's proposer
• When proposal_name does not exist
• When proposal_name is already expired

Example

eosc tx create eosforumrcpp expire '{"proposal_name": "example"}' -p proposer1@active

OR

eosc forum expire proposer1 example

Note proposer1 must be the same as the one that created initially the example proposal.

Action clnproposal

Clean a proposal from all its votes and the proposal itself once there are no more associated votes. The action works iteratively, receiving a max_count value. It removes as many as max_count votes. When there are no more votes, the proposal itself is deleted.

This effectively clears all the RAM consumed for a proposal and all its votes. Call the action multiple times until all votes are removed.

It's possible to clean a proposal only if it has expired and if its freeze period of 3 days has fully elapsed. Within the freeze period, the proposal is locked and no actions can be performed on it. Since only expired proposals can be cleaned, anybody can invoke this action, no authorization is required. Voters, proposers, or any community member is invited to call clnproposal to clean the RAM related to a proposal.

Note Since a proposal can expire only by a manual action issued by the proposal's author or if it has passed its expires_at value, it's safe to be called by anybody since the proposal has effectively terminated its lifecycle.

Parameters

• cleaner_account (type name) - The account that CPU/NET will be charged to
• proposal_name (type name) - The proposal's name to clean
• max_count (type uint64) - The amount of votes to clean out in this batch

Rejections

• When proposal_name is not expired yet
• When proposal_name is expired but within its freeze period of 3 days

Note Giving a max_count that is too big increases the probability that the transaction fails due to excessive CPU usage. Find the sweet spot to avoid that.

Example

eosc tx create eosforumrcpp clnproposal '{"proposal_name": "example", "max_count": 100}' -p voter1@active

OR

eosc forum clean-proposal [cleaner_account_name] example 100

Action post

Parameters

• poster (type account_name) - The poster's account
• post_uuid (type string) - The post UUID (for reply purposes)
• content (type string) - The actual content of the post
• reply_to_poster (type account_name) - The initial post's poster your post replies to
• reply_to_post_uuid (type string) - The initial post's UUID your post replies to
• certify (type bool) - Reserved for future use
• json_metadata (type string) - The post's JSON metadata, no specification yet, see JSON Structure Guidelines

Rejections

• When missing signature of poster
• When content is an empty string
• When content is bigger than 10240 characters
• When post_uuid is an empty string
• When post_uuid is bigger than 128 characters
• When reply_to_poster is not set but reply_to_post_uuid is
• When reply_to_poster is not an existing account
• When reply_to_poster is set and reply_to_post_uuid is an empty string
• When reply_to_poster is set and reply_to_post_uuid is bigger than 128 characters
• When json_metadata JSON is invalid or too large (must be a JSON object and be less than 8192 characters)

Example

eosc tx create eosforumrcpp post '{"poster": "poster1", "post_uuid":"examplepost_id", "content": "hello world", "reply_to_poster": "", "reply_to_post_uuid": "", "certify": false, "json_metadata": "{\"type\": \"chat\"}"}' -p poster1@active

OR

eosc forum post poster1 "hello world"

Action unpost

Parameters

• poster (type account_name) - Remove a previous post you did
• post_uuid (type string) - The UUID of the post to remove

Rejections

• When missing signature of poster
• When post_uuid is an empty string
• When post_uuid is bigger than 128 characters

Example

eosc tx create eosforumrcpp unpost '{"poster": "poster1", "post_uuid":"examplepost_id"}' -p poster1@active

OR

eosc forum unpost poster1 [UUID_of_example]

Action status

Record a status for the associated account. If the content is empty, the action will remove a previous status. Otherwise, it will add a status entry for the account using the content received.

Parameters

• account (type account_name) - The account to add a status to
• content (type string) - The content associated to the status

Rejections

• When missing signature of account
• When post_uuid is bigger than 256 characters
• When content is the empty string and no previous status existed for account

Example (add status):

eosc tx create eosforumrcpp status '{"account": "voter2", "content":"status of something"}' -p voter2@active

Example (remove previous status):

eosc tx create eosforumrcpp status '{"account": "voter2", "content":""}' -p voter2@active

OR

eosc forum status voter2 "status of something"

Example (remove previous status):

eosc forum status voter2 ""

Table proposals

Row

• proposal_name (type name) - The proposal's name, its ID among all proposals
• proposer (type account_name) - The actual proposer's account
• title (type string) - The proposal's title, a brief description of the proposal
• proposal_json (type string) - The proposal's JSON metadata, no specification yet, see JSON Structure Guidelines
• created_at (type time_point_sec) - The date at which the proposal's was created, ISO 8601 string format (in UTC) without a timezone modifier.
• expires_at (type time_point_sec) - The date at which the proposal's will expire, ISO 8601 string format (in UTC) without a timezone modifier.

Indexes

• First (1 type name) - Index by proposal_name field
• Second (2 type name) - Index by proposer

Example (get all proposals):

eosc get table eosforumrcpp eosforumrcpp proposal

OR

eosc forum list

Example (get all proposals for a given proposer):

Caveats Right now, eosc does not support searching giving only a direct key. Instead, it really requires a lower and upper bound. The upper bound being exclusive, to correctly get the upper bound, take the account name and change the last character to the next one in the EOS name alphabet (order is a-z1-5.).

So, looking for all proposals proposed by testusertest, the lower bound key would be testusertest and the upper bound key would be testusertesu (last character t bumped to next one u).

eosc get table eosforumrcpp eosforumrcpp proposal --index 2 --key-type name --lower-bound testusertest --upper-bound testusertesu

OR

eosc forum list --from-proposer testusertest

Table status

Row

• account (type account_name) - The status' poster
• content (type string) - The content of the status
• updated_at (type time_point_sec) - The date at which the status was last updated, ISO 8601 string format (in UTC) without a timezone modifier.

Example

eosc get table eosforumrcpp eosforumrcpp status

Table vote

Row

• id (type uint64) - The unique ID of the voter/proposal_name pair
• proposal_name (type name) - The proposal_name on which the vote applies
• voter (type account_name) - The voter that voted
• vote (type uint8) - The vote value of the voter (0 means negative vote, 1 means a positive vote)
• vote_json (type string) - The vote's JSON metadata, no specification yet, see JSON Structure Guidelines
• updated_at (type time_point_sec) - The date at which the vote was last updated, ISO 8601 string format (in UTC) without a timezone modifier.

Indexes

• First (1 type i64) - Index by id field
• Second (2 type i128 input in hexadecimal little-endian format) - Index by proposal name, the key is composed in the high bytes using the proposal_name and the low bytes are the voter.
• Third (3 type i128 input in hexadecimal little-endian format) - Index by voter, the key is composed in the high bytes using the voter and the low bytes are the proposal_name.

Example (get all votes):

eosc get table eosforumrcpp eosforumrcpp vote

Example (get all votes for a given proposal):

The idea is to turn the proposal_name into an integer, convert it to hexadecimal, and compute the lowest possible key for voter (lower bound) as well as the highest possible key for voter (upper bound).

Note The hexadecimal values below are all in little-endian format, so high bytes are on the right side and low bytes on the left side.

Here are the steps to compute the lower/upper bounds for the table query:

1. Convert ramusetest EOS name to hexadecimal using eosc tools name.

eosc tools names ramusetest

from \ to  hex               hex_be            name        uint64
---------  ---               ------            ----        ------
name       0040c62a2baca5b9  b9a5ac2b2ac64000  ramusetest  13377287569575133184

1. Create the lower_bound key by prepending 0000000000000000 to the hex value shown above: 0x00000000000000000040c62a2baca5b9

2. Create the upper_bound key by prepending ffffffffffffffff to the hex value shown above: 0xffffffffffffffff0040c62a2baca5b9.

Now that we have the lower and upper bound keys, simply perform your query:

eosc get table eosforumrcpp eosforumrcpp vote --index 2 --key-type i128 --lower-bound 0x00000000000000000040c62a2baca5b9 --upper-bound 0xffffffffffffffff0040c62a2baca5b9

You will see only the votes against the proposal ramusetest.

Example (get all proposals a voter voted for):

The idea is to turn the voter into an integer, convert it to hexadecimal, and compute the lowest possible key for proposal_name (lower bound) as well as the highest possible key for proposal_name (upper bound).

Note The hexadecimal values below are all in little-endian format, so high bytes are on the right side and low bytes on the left side.

Here the steps to compute the lower/upper bounds for the table query:

1. Convert testusertest EOS name to hexadecimal using eosc tools name.

eosc tools names testusertest

from \ to  hex               hex_be            name          uint64
---------  ---               ------            ----          ------
name       90b1ca57619db1ca  cab19d6157cab190  testusertest  14605628107949519248

1. Create the lower_bound key by prepending 0000000000000000 to the hex value shown above: 0x000000000000000090b1ca57619db1ca

2. Create the upper_bound key by prepending ffffffffffffffff to the hex value shown above: 0xffffffffffffffff90b1ca57619db1ca.

Now that we have the lower and upper bound keys, simply perform your query:

eosc get table eosforumrcpp eosforumrcpp vote --index 3 --key-type i128 --lower-bound 0x000000000000000090b1ca57619db1ca --upper-bound 0xffffffffffffffff90b1ca57619db1ca

You will see only the proposals that voter testusertest voted for.

JSON Structure Guidelines

You can use any vocabulary you want when creating posts, proposals and votes, there is no specification yet for the JSON. However, by following some simple guidelines, you can simplify your life and the life of those building UIs around these messages.

For all json prefixed or suffixed fields in propose, vote and post, the type field should determine a higher order protocol, and determines what other sibling fields will be required.

In a propose's proposal_json field

• type is a required field to distinguish protocol. See types in the section below.

• question means the reference language question of a proposition.

• content is a Markdown document, detailing everything there is to know about the proposal (tally methods, time frame, references, required etc..)

In a vote's vote_json field

• type is optional. Defaults to simple if not present.

type values

• simple is the same as no type at all. The value of the vote is the boolean vote field of the action.

In a post's json_metadata field

• type is a required field to distinguish protocol. See below for sample types

The following fields attempt to standardize the meaning of certain keys. If you specify your own type, you can define whatever you want.

• title is a title that will be shown above a message, often used in clickable headlines. Similar to a Reddit post's title.

• tags is a list of strings, prefixed or not with a #.

type values

• chat, which is a simple chat, pushing a message out.

• eos-bps-roll-call, this is used within EOS Block Producers calls to indicate they are present.

• eos-bps-emergency, once 3 block producers send a message of this type within an hour, all block producers can trigger a wake-up alarm within 1h. Do not abuse this message to avoid alert fatigue. ##### Example serious vulnerability requires mitigation, serious network issues, immediate action required, etc..

• eos-bps-notify, once 7 block producers send a message of this type within an hour, other block producers can trigger a notification to get their attention in the next 24h. ##### Example new ECAF order requires attention.

• eos-arbitration-order, BPs can watch for known Arbitration forums accounts, and alert themselves of required action. Further fields could be defined like a link to the PDF format order; a reference to a ready-made eosio.msig transaction proposition; etc..

License

MIT See license file

Credits

Original code and inspiration: Daniel Larimer