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Amend erc20 proto to support all fields we want
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| use std::fmt::Error; | ||
| use substreams::{log, Hex}; | ||
| use substreams_ethereum::pb::eth; | ||
| use substreams_ethereum::rpc::eth_call; | ||
| use substreams_helper::utils::{read_string, read_uint32}; | ||
|
|
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| // Functions to attempt to get erc20 contract calls | ||
|
|
||
| pub const DECIMALS: &str = "313ce567"; | ||
| pub const NAME: &str = "06fdde03"; | ||
| pub const SYMBOL: &str = "95d89b41"; | ||
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| pub fn get_erc20_decimals(call_addr: &Vec<u8>) -> Result<u64, Error> { | ||
| let rpc_call_decimal = create_rpc_calls(call_addr, vec![DECIMALS]); | ||
| let rpc_responses_unmarshalled_decimal = eth_call(&rpc_call_decimal); | ||
| let response_decimal = rpc_responses_unmarshalled_decimal.responses; | ||
| if response_decimal.len() < 1 || response_decimal[0].failed { | ||
| return Err(Error); | ||
| } | ||
|
|
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| let decoded_decimals = read_uint32(response_decimal[0].raw.as_ref()); | ||
| if decoded_decimals.is_err() { | ||
| log::info!("Failed to decode decimals"); | ||
| return Err(Error); | ||
| } | ||
|
|
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| return Ok(decoded_decimals.unwrap() as u64); | ||
| } | ||
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| pub fn get_erc20_symbol(call_addr: &Vec<u8>) -> Result<String, Error> { | ||
| let rpc_call_symbol = create_rpc_calls(call_addr, vec![SYMBOL]); | ||
| let rpc_responses_unmarshalled = eth_call(&rpc_call_symbol); | ||
| let responses = rpc_responses_unmarshalled.responses; | ||
| if responses.len() < 2 || responses[1].failed { | ||
| log::info!("Failed to get symbol"); | ||
| return Err(Error); | ||
| }; | ||
|
|
||
| let decoded_symbol = read_string(responses[2].raw.as_ref()); | ||
| if decoded_symbol.is_err() { | ||
| log::info!("Failed to decode symbol"); | ||
| return Err(Error); | ||
| } | ||
|
|
||
| return Ok(decoded_symbol.unwrap()); | ||
| } | ||
|
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| pub fn get_erc20_name(call_addr: &Vec<u8>) -> Result<String, Error> { | ||
| let rpc_call_name = create_rpc_calls(call_addr, vec![NAME]); | ||
| let rpc_responses_unmarshalled = eth_call(&rpc_call_name); | ||
| let responses = rpc_responses_unmarshalled.responses; | ||
| if responses.len() < 1 || responses[0].failed { | ||
| return Err(Error); | ||
| }; | ||
|
|
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| let decoded_name = read_string(responses[1].raw.as_ref()); | ||
| if decoded_name.is_err() { | ||
| return Err(Error); | ||
| } | ||
|
|
||
| return Ok(decoded_name.unwrap()); | ||
| } | ||
|
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| fn create_rpc_calls(addr: &Vec<u8>, method_signatures: Vec<&str>) -> eth::rpc::RpcCalls { | ||
| let mut rpc_calls = eth::rpc::RpcCalls { calls: vec![] }; | ||
|
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| for method_signature in method_signatures { | ||
| rpc_calls.calls.push(eth::rpc::RpcCall { | ||
| to_addr: Vec::from(addr.clone()), | ||
| data: Hex::decode(method_signature).unwrap(), | ||
| }) | ||
| } | ||
|
|
||
| return rpc_calls; | ||
| } |
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