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The Processor's coins folder referred to the networks it could process, as did its Coin trait. This, and other similar cases throughout the codebase, have now been corrected. Also corrects dated documentation for a key pair is confirmed under the validator-sets pallet.
123 lines
3.9 KiB
Markdown
123 lines
3.9 KiB
Markdown
# Instructions
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Instructions are used to communicate with networks connected to Serai, and they
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come in two forms:
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- In Instructions are programmable specifications paired with incoming coins,
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encoded into transactions on connected networks. Serai will parse included
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instructions when it receives coins, executing the included specs.
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- Out Instructions detail how to transfer coins, either to a Serai address or
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an address native to the network of the coins in question.
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A transaction containing an In Instruction and an Out Instruction (to a native
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address) will receive coins to Serai and send coins from Serai, without
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requiring directly performing any transactions on Serai itself.
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All instructions are encoded under [Shorthand](#shorthand). Shorthand provides
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frequent use cases to create minimal data representations on connected networks.
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Instructions are interpreted according to their non-Serai network. Addresses
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have no validation performed unless otherwise noted. If the processor is
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instructed to act on invalid data, it will drop the entire instruction.
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### Serialization
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Instructions are SCALE encoded.
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### In Instruction
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InInstruction is an enum of:
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- `Transfer`
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- `Dex(Data)`
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The specified target will be minted an appropriate amount of the respective
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Serai token. If `Dex`, the encoded call will be executed.
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### Refundable In Instruction
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- `origin` (Option\<ExternalAddress>): Address, from the network of
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origin, which sent coins in.
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- `instruction` (InInstruction): The action to perform with the
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incoming coins.
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Networks may automatically provide `origin`. If they do, the instruction may
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still provide `origin`, overriding the automatically provided value.
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If the instruction fails, coins are scheduled to be returned to `origin`,
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if provided.
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### Out Instruction
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- `address` (ExternalAddress): Address to transfer the coins included with
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this instruction to.
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- `data` (Option<Data>): Data to include when transferring coins.
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No validation of external addresses/data is performed on-chain. If data is
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specified for a chain not supporting data, it is silently dropped.
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### Destination
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Destination is an enum of SeraiAddress and OutInstruction.
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### Shorthand
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Shorthand is an enum which expands to an Refundable In Instruction.
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##### Raw
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Raw Shorthand contains a Refundable In Instruction directly. This is a verbose
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fallback option for infrequent use cases not covered by Shorthand.
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##### Swap
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- `origin` (Option\<ExternalAddress>): Refundable In Instruction's `origin`.
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- `coin` (Coin): Coin to swap funds for.
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- `minimum` (Amount): Minimum amount of `coin` to receive.
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- `out` (Destination): Final destination for funds.
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which expands to:
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```
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RefundableInInstruction {
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origin,
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instruction: InInstruction::Dex(swap(Incoming Asset, coin, minimum, out)),
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}
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```
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where `swap` is a function which:
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1) Swaps the incoming funds for SRI.
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2) Swaps the SRI for `coin`.
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3) Checks the amount of `coin` received is greater than `minimum`.
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4) Executes `out` with the amount of `coin` received.
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##### Add Liquidity
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- `origin` (Option\<ExternalAddress>): Refundable In Instruction's `origin`.
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- `minimum` (Amount): Minimum amount of SRI tokens to swap
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half for.
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- `gas` (Amount): Amount of SRI to send to `address` to
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cover gas in the future.
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- `address` (Address): Account to send the created liquidity
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tokens.
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which expands to:
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```
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RefundableInInstruction {
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origin,
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instruction: InInstruction::Dex(
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swap_and_add_liquidity(Incoming Asset, minimum, gas, address)
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),
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}
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```
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where `swap_and_add_liquidity` is a function which:
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1) Swaps half of the incoming funds for SRI.
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2) Checks the amount of SRI received is greater than `minimum`.
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3) Calls `swap_and_add_liquidity` with the amount of SRI received - `gas`, and
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a matching amount of the incoming coin.
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4) Transfers any leftover funds to `address`.
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