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decoder.ts
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decoder.ts
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import
{
decodeFunctionData
,
parseAbi
,
parseAbiItem
,
type
Abi
,
type
Hex
,
}
from
'viem'
;
import
{
SignatureDecoder
}
from
'./signature-decoder'
;
import
{
EtherscanClient
}
from
'./etherscan-client'
;
import
type
{
MulticallCall
,
DecodedCall
,
DecoderOptions
}
from
'./types'
;
/**
* Main decoder for multicall transaction data
*/
export
class
MulticallDecoder
{
private
signatureDecoder
:
SignatureDecoder
;
private
etherscanClient
:
EtherscanClient
;
private
verbose
:
boolean
;
constructor
(
options
:
DecoderOptions
=
{
}
)
{
this
.
signatureDecoder
=
new
SignatureDecoder
(
)
;
this
.
etherscanClient
=
new
EtherscanClient
(
{
apiKey
:
options
.
etherscanApiKey
,
network
:
options
.
network
,
}
)
;
this
.
verbose
=
options
.
verbose
||
false
;
}
/**
* Parse multicall data into individual calls
* Supports common multicall formats (Multicall2, Multicall3)
*/
parseMulticallData
(
data
:
string
)
:
MulticallCall
[
]
{
const
calls
:
MulticallCall
[
]
=
[
]
;
try
{
// Try to decode as Multicall3 aggregate3 format
// aggregate3((address,bool,bytes)[])
const
multicall3Abi
=
parseAbi
(
[
'function aggregate3((address target, bool allowFailure, bytes callData)[] calls) external payable returns ((bool success, bytes returnData)[] returnData)'
,
]
)
;
try
{
const
decoded
=
decodeFunctionData
(
{
abi
:
multicall3Abi
,
data
:
data
as
Hex
,
}
)
;
if
(
decoded
.
functionName
===
'aggregate3'
&&
decoded
.
args
&&
Array
.
isArray
(
decoded
.
args
[
0
]
)
)
{
for
(
const
call
of
decoded
.
args
[
0
]
as
any
[
]
)
{
calls
.
push
(
{
target
:
call
.
target
,
callData
:
call
.
callData
,
}
)
;
}
return
calls
;
}
}
catch
(
e
)
{
// Not Multicall3 format, continue
}
// Try to decode as Multicall2 aggregate format
// aggregate((address,bytes)[])
const
multicall2Abi
=
parseAbi
(
[
'function aggregate((address target, bytes callData)[] calls) external returns (uint256 blockNumber, bytes[] returnData)'
,
]
)
;
try
{
const
decoded
=
decodeFunctionData
(
{
abi
:
multicall2Abi
,
data
:
data
as
Hex
,
}
)
;
if
(
decoded
.
functionName
===
'aggregate'
&&
decoded
.
args
&&
Array
.
isArray
(
decoded
.
args
[
0
]
)
)
{
for
(
const
call
of
decoded
.
args
[
0
]
as
any
[
]
)
{
calls
.
push
(
{
target
:
call
.
target
,
callData
:
call
.
callData
,
}
)
;
}
return
calls
;
}
}
catch
(
e
)
{
// Not Multicall2 format
}
// Try tryAggregate format
const
tryAggregateAbi
=
parseAbi
(
[
'function tryAggregate(bool requireSuccess, (address target, bytes callData)[] calls) external returns ((bool success, bytes returnData)[] returnData)'
,
]
)
;
try
{
const
decoded
=
decodeFunctionData
(
{
abi
:
tryAggregateAbi
,
data
:
data
as
Hex
,
}
)
;
if
(
decoded
.
functionName
===
'tryAggregate'
&&
decoded
.
args
&&
Array
.
isArray
(
decoded
.
args
[
1
]
)
)
{
for
(
const
call
of
decoded
.
args
[
1
]
as
any
[
]
)
{
calls
.
push
(
{
target
:
call
.
target
,
callData
:
call
.
callData
,
}
)
;
}
return
calls
;
}
}
catch
(
e
)
{
// Not tryAggregate format
}
// Try tryBlockAndAggregate format
const
tryBlockAbi
=
parseAbi
(
[
'function tryBlockAndAggregate(bool requireSuccess, (address target, bytes callData)[] calls) external returns (uint256 blockNumber, bytes32 blockHash, (bool success, bytes returnData)[] returnData)'
,
]
)
;
try
{
const
decoded
=
decodeFunctionData
(
{
abi
:
tryBlockAbi
,
data
:
data
as
Hex
,
}
)
;
if
(
decoded
.
functionName
===
'tryBlockAndAggregate'
&&
decoded
.
args
&&
Array
.
isArray
(
decoded
.
args
[
1
]
)
)
{
for
(
const
call
of
decoded
.
args
[
1
]
as
any
[
]
)
{
calls
.
push
(
{
target
:
call
.
target
,
callData
:
call
.
callData
,
}
)
;
}
return
calls
;
}
}
catch
(
e
)
{
// Not tryBlockAndAggregate format
}
throw
new
Error
(
'Unable to parse multicall data - unknown format'
)
;
}
catch
(
error
)
{
if
(
this
.
verbose
)
{
console
.
error
(
'Error parsing multicall data:'
,
error
)
;
}
throw
error
;
}
}
/**
* Decode a single call data
*/
async
decodeCall
(
target
:
string
,
callData
:
string
)
:
Promise
<
DecodedCall
>
{
const
selector
=
callData
.
slice
(
0
,
10
)
;
// First, try to get ABI from Etherscan
const
abi
=
await
this
.
etherscanClient
.
getContractAbi
(
target
)
;
if
(
abi
)
{
try
{
const
decoded
=
decodeFunctionData
(
{
abi
,
data
:
callData
as
Hex
,
}
)
;
const
functionFragment
=
abi
.
find
(
(
item
:
any
)
=>
item
.
type
===
'function'
&&
item
.
name
===
decoded
.
functionName
)
as
any
;
let
signature
=
decoded
.
functionName
;
if
(
functionFragment
&&
functionFragment
.
inputs
)
{
const
inputTypes
=
functionFragment
.
inputs
.
map
(
(
input
:
any
)
=>
input
.
type
)
.
join
(
','
)
;
signature
=
`
${
decoded
.
functionName
}
(
${
inputTypes
}
)`
;
}
return
{
target
,
functionName
:
decoded
.
functionName
,
functionSignature
:
signature
,
args
:
decoded
.
args
as
any
[
]
,
rawCallData
:
callData
,
}
;
}
catch
(
error
)
{
// Fall through to 4byte directory
}
}
// Fallback to 4byte directory
const
signatures
=
await
this
.
signatureDecoder
.
lookupSelector
(
selector
)
;
if
(
signatures
.
length
===
0
)
{
return
{
target
,
functionName
:
'unknown'
,
functionSignature
:
selector
,
args
:
[
callData
.
slice
(
10
)
]
,
// Return raw data without selector
rawCallData
:
callData
,
}
;
}
// Try each signature until one works
for
(
const
sig
of
signatures
)
{
try
{
// Use parseAbiItem for dynamic signatures
const
abiItem
=
parseAbiItem
(
`function
${
sig
.
signature
}
`
)
;
const
decoded
=
decodeFunctionData
(
{
abi
:
[
abiItem
]
,
data
:
callData
as
Hex
,
}
)
;
return
{
target
,
functionName
:
sig
.
name
,
functionSignature
:
sig
.
signature
,
args
:
(
decoded
.
args
||
[
]
)
as
any
[
]
,
rawCallData
:
callData
,
}
;
}
catch
(
error
)
{
// Try next signature
continue
;
}
}
// If all signatures fail, return the first one with raw data
return
{
target
,
functionName
:
signatures
[
0
]
.
name
,
functionSignature
:
signatures
[
0
]
.
signature
,
args
:
[
callData
.
slice
(
10
)
]
,
rawCallData
:
callData
,
}
;
}
/**
* Decode all calls in multicall data
*/
async
decodeMulticall
(
data
:
string
)
:
Promise
<
DecodedCall
[
]
>
{
const
calls
=
this
.
parseMulticallData
(
data
)
;
const
decodedCalls
:
DecodedCall
[
]
=
[
]
;
for
(
const
call
of
calls
)
{
const
decoded
=
await
this
.
decodeCall
(
call
.
target
,
call
.
callData
)
;
decodedCalls
.
push
(
decoded
)
;
}
return
decodedCalls
;
}
}
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