5aed8b3ef5
Functions must be annotated as `stateful` in order to - Update the contract state (using `put`) - Call `Chain.spend` or other primitive functions that cost tokens - Call an Oracle or AENS function that requires a signature - Make a remote call with a non-zero value - Construct a lambda calling a stateful function It does not need to be stateful to - Read the contract state - Call another contract with value=0, even when the remote function is stateful
70 lines
1.7 KiB
Plaintext
70 lines
1.7 KiB
Plaintext
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// Testing primitives for accessing the block chain environment
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contract Interface =
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function contract_address : () => address
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function call_origin : () => address
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function call_caller : () => address
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function call_value : () => int
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contract Environment =
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record state = {remote : Interface}
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function init(remote) = {remote = remote}
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stateful function set_remote(remote) = put({remote = remote})
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// -- Information about the this contract ---
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// Address
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function contract_address() : address = Contract.address
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function nested_address(who) : address =
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who.contract_address(gas = 1000)
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// Balance
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function contract_balance() : int = Contract.balance
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// -- Information about the current call ---
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// Origin
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function call_origin() : address = Call.origin
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function nested_origin() : address =
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state.remote.call_origin()
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// Caller
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function call_caller() : address = Call.caller
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function nested_caller() : address =
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state.remote.call_caller()
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// Value
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function call_value() : int = Call.value
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stateful function nested_value(value : int) : int =
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state.remote.call_value(value = value / 2)
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// Gas price
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function call_gas_price() : int = Call.gas_price
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// -- Information about the chain ---
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// Account balances
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function get_balance(acct : address) : int = Chain.balance(acct)
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// Block hash
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function block_hash(height : int) : int = Chain.block_hash(height)
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// Coinbase
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function coinbase() : address = Chain.coinbase
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// Block timestamp
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function timestamp() : int = Chain.timestamp
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// Block height
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function block_height() : int = Chain.block_height
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// Difficulty
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function difficulty() : int = Chain.difficulty
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// Gas limit
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function gas_limit() : int = Chain.gas_limit
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