ABI.TypeEncoder (abi v0.1.21)
ABI.TypeEncoder is responsible for encoding types to the format
expected by Solidity. We generally take a function selector and an
array of data and encode that array according to the specification.
Summary
Functions
Encodes the given data based on the function selector.
Simiar to ABI.TypeEncoder.encode/2 except we accept
an array of types instead of a function selector. We also
do not pre-pend the method id.
Functions
Link to this function
encode(data, function_selector)
Encodes the given data based on the function selector.
Examples
iex> [69, true]
...> |> ABI.TypeEncoder.encode(
...> %ABI.FunctionSelector{
...> function: "baz",
...> types: [
...> {:uint, 32},
...> :bool
...> ],
...> returns: :bool
...> }
...> )
...> |> Base.encode16(case: :lower)
"cdcd77c000000000000000000000000000000000000000000000000000000000000000450000000000000000000000000000000000000000000000000000000000000001"
iex> ["BAT"]
...> |> ABI.TypeEncoder.encode(
...> %ABI.FunctionSelector{
...> function: "price",
...> types: [
...> :string
...> ],
...> returns: {:uint, 256}
...> }
...> )
...> |> Base.encode16(case: :lower)
"fe2c6198000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000034241540000000000000000000000000000000000000000000000000000000000"
iex> ["hello world"]
...> |> ABI.TypeEncoder.encode(
...> %ABI.FunctionSelector{
...> function: nil,
...> types: [
...> :string,
...> ]
...> }
...> )
...> |> Base.encode16(case: :lower)
"000000000000000000000000000000000000000000000000000000000000000b68656c6c6f20776f726c64000000000000000000000000000000000000000000"
iex> [{"awesome", true}]
...> |> ABI.TypeEncoder.encode(
...> %ABI.FunctionSelector{
...> function: nil,
...> types: [
...> {:tuple, [:string, :bool]}
...> ]
...> }
...> )
...> |> Base.encode16(case: :lower)
"000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000007617765736f6d6500000000000000000000000000000000000000000000000000"
iex> [{17, true, <<32, 64>>}]
...> |> ABI.TypeEncoder.encode(
...> %ABI.FunctionSelector{
...> function: nil,
...> types: [
...> {:tuple, [{:uint, 32}, :bool, {:bytes, 2}]}
...> ]
...> }
...> )
...> |> Base.encode16(case: :lower)
"000000000000000000000000000000000000000000000000000000000000001100000000000000000000000000000000000000000000000000000000000000012040000000000000000000000000000000000000000000000000000000000000"
iex> [{17, true, <<32, 64>>}]
...> |> ABI.TypeEncoder.encode(
...> %ABI.FunctionSelector{
...> function: nil,
...> types: [
...> {:struct, "Cat", [{:uint, 32}, :bool, {:bytes, 2}], ["age", "cool", "mice"]}
...> ]
...> }
...> )
...> |> Base.encode16(case: :lower)
"000000000000000000000000000000000000000000000000000000000000001100000000000000000000000000000000000000000000000000000000000000012040000000000000000000000000000000000000000000000000000000000000"
iex> [[17, 1]]
...> |> ABI.TypeEncoder.encode(
...> %ABI.FunctionSelector{
...> function: "baz",
...> types: [
...> {:array, {:uint, 32}, 2}
...> ]
...> }
...> )
...> |> Base.encode16(case: :lower)
"3d0ec53300000000000000000000000000000000000000000000000000000000000000110000000000000000000000000000000000000000000000000000000000000001"
iex> [[17, 1], true]
...> |> ABI.TypeEncoder.encode(
...> %ABI.FunctionSelector{
...> function: nil,
...> types: [
...> {:array, {:uint, 32}, 2},
...> :bool
...> ]
...> }
...> )
...> |> Base.encode16(case: :lower)
"000000000000000000000000000000000000000000000000000000000000001100000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000001"
iex> [[17, 1]]
...> |> ABI.TypeEncoder.encode(
...> %ABI.FunctionSelector{
...> function: nil,
...> types: [
...> {:array, {:uint, 32}}
...> ]
...> }
...> )
...> |> Base.encode16(case: :lower)
"000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000110000000000000000000000000000000000000000000000000000000000000001"
Link to this function
encode_bytes(bytes)
Link to this function
encode_raw(data, types)
Simiar to ABI.TypeEncoder.encode/2 except we accept
an array of types instead of a function selector. We also
do not pre-pend the method id.
Examples
iex> [{"awesome", true}]
...> |> ABI.TypeEncoder.encode_raw([{:tuple, [:string, :bool]}])
...> |> Base.encode16(case: :lower)
"000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000007617765736f6d6500000000000000000000000000000000000000000000000000"