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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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