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Added: events ERC20.OnTransfer() and ERC20.OnApproval()
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,224 @@ | ||
| {******************************************************************************} | ||
| { } | ||
| { Delphereum } | ||
| { } | ||
| { Copyright(c) 2019 Stefan van As <svanas@runbox.com> } | ||
| { Github Repository <https://github.com/svanas/delphereum> } | ||
| { } | ||
| { Distributed under Creative Commons NonCommercial (aka CC BY-NC) license. } | ||
| { } | ||
| {******************************************************************************} | ||
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| unit web3.eth.logs; | ||
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| {$I web3.inc} | ||
|
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| interface | ||
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| uses | ||
| // Delphi | ||
| System.JSON, | ||
| System.Threading, | ||
| // Velthuis' BigNumbers | ||
| Velthuis.BigIntegers, | ||
| // web3 | ||
| web3, | ||
| web3.eth.types; | ||
|
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| type | ||
| TLog = record | ||
| strict private | ||
| FBlockNumber: BigInteger; | ||
| FTopics : TTopics; | ||
| FData : TTuple; | ||
| function GetTopic(idx: Integer): TArg; | ||
| public | ||
| procedure Load(tx: TJsonValue); | ||
| function isEvent(const name: string): Boolean; | ||
| property BlockNumber: BigInteger read FBlockNumber; | ||
| property Topic[idx: Integer]: TArg read GetTopic; | ||
| property Data: TTuple read FData; | ||
| end; | ||
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| type | ||
| PLog = ^TLog; | ||
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| type | ||
| TASyncLog = reference to procedure(log: TLog); | ||
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| function get(client: TWeb3; address: TAddress; callback: TASyncLog): ITask; | ||
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| implementation | ||
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| uses | ||
| // Delphi | ||
| System.Classes, | ||
| System.SysUtils, | ||
| // web3 | ||
| web3.eth, | ||
| web3.json, | ||
| web3.json.rpc, | ||
| web3.utils; | ||
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| { TLog } | ||
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| function TLog.GetTopic(idx: Integer): TArg; | ||
| begin | ||
| Result := FTopics[idx]; | ||
| end; | ||
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| procedure TLog.Load(tx: TJsonValue); | ||
| var | ||
| tpcs: TJsonArray; | ||
| tpc : Integer; | ||
| buf : TBytes; | ||
| arg : TArg; | ||
| last: PArg; | ||
| begin | ||
| FBlockNumber := web3.json.GetPropAsStr(tx, 'blockNumber'); | ||
| // load the "topics" | ||
| tpcs := web3.json.GetPropAsArr(tx, 'topics'); | ||
| if Assigned(tpcs) then | ||
| for tpc := 0 to Pred(tpcs.Count) do | ||
| begin | ||
| buf := web3.utils.fromHex(tpcs.Items[tpc].Value); | ||
| if Length(buf) >= SizeOf(TArg) then | ||
| begin | ||
| Move(buf[0], arg[0], SizeOf(TArg)); | ||
| FTopics[tpc] := arg; | ||
| end; | ||
| end; | ||
| // load the "data" | ||
| buf := web3.utils.fromHex(web3.json.GetPropAsStr(tx, 'data')); | ||
| while Length(buf) >= SizeOf(TArg) do | ||
| begin | ||
| last := Data.Add; | ||
| Move(buf[0], last[0], SizeOf(TArg)); | ||
| Delete(buf, 0, SizeOf(TArg)); | ||
| end; | ||
| end; | ||
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| function TLog.isEvent(const name: string): Boolean; | ||
| var | ||
| buf: TBytes; | ||
| arg: TArg; | ||
| begin | ||
| buf := web3.utils.sha3(web3.utils.toHex(name)); | ||
| Move(buf[0], arg[0], SizeOf(TArg)); | ||
| Result := CompareMem(@FTopics[0], @arg, SizeOf(TArg)); | ||
| end; | ||
|
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| { TLogs } | ||
|
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| type | ||
| TLogs = TArray<TLog>; | ||
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| { TLogsHelper } | ||
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| type | ||
| TLogsHelper = record helper for TLogs | ||
| function Add : PLog; | ||
| function Last: PLog; | ||
| end; | ||
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| function TLogsHelper.Add: PLog; | ||
| begin | ||
| SetLength(Self, Length(Self) + 1); | ||
| Result := Last; | ||
| end; | ||
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| function TLogsHelper.Last: PLog; | ||
| begin | ||
| Result := nil; | ||
| if Length(Self) > 0 then | ||
| Result := @Self[High(Self)]; | ||
| end; | ||
|
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| { private functions } | ||
|
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| function blockNumber(client: TWeb3): BigInteger; | ||
| var | ||
| obj: TJsonObject; | ||
| begin | ||
| obj := web3.json.rpc.send(client.URL, 'eth_blockNumber', []); | ||
| if Assigned(obj) then | ||
| try | ||
| Result := web3.json.GetPropAsStr(obj, 'result'); | ||
| finally | ||
| obj.Free; | ||
| end; | ||
| end; | ||
|
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| function getAsArr(client: TWeb3; fromBlock: BigInteger; address: TAddress): TJsonArray; | ||
| var | ||
| &in : TJsonObject; | ||
| &out: TJsonObject; | ||
| arr : TJsonArray; | ||
| begin | ||
| Result := nil; | ||
| &in := web3.json.unmarshal(Format( | ||
| '{"fromBlock": "%s", "toBlock": %s, "address": %s}', [ | ||
| web3.utils.toHex(fromBlock), | ||
| web3.json.QuoteString(BLOCK_LATEST, '"'), | ||
| web3.json.QuoteString(string(address), '"') | ||
| ] | ||
| )); | ||
| try | ||
| &out := web3.json.rpc.send(client.URL, 'eth_getLogs', [&in]); | ||
| if Assigned(&out) then | ||
| try | ||
| arr := web3.json.GetPropAsArr(&out, 'result'); | ||
| if Assigned(arr) then | ||
| Result := arr.Clone as TJsonArray; | ||
| finally | ||
| &out.Free; | ||
| end; | ||
| finally | ||
| &in.Free; | ||
| end; | ||
| end; | ||
|
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| function getAsLog(client: TWeb3; fromBlock: BigInteger; address: TAddress): TLogs; | ||
| var | ||
| arr : TJsonArray; | ||
| itm : TJsonValue; | ||
| last: PLog; | ||
| begin | ||
| SetLength(Result, 0); | ||
| arr := getAsArr(client, fromBlock, address); | ||
| if Assigned(arr) then | ||
| try | ||
| for itm in arr do | ||
| begin | ||
| last := Result.Add; | ||
| last.Load(itm); | ||
| end; | ||
| finally | ||
| arr.Free; | ||
| end; | ||
| end; | ||
|
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| { public functions } | ||
|
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| function get(client: TWeb3; address: TAddress; callback: TASyncLog): ITask; | ||
| begin | ||
| Result := TTask.Create(procedure | ||
| var | ||
| bn : BigInteger; | ||
| log : TLog; | ||
| logs: TLogs; | ||
| begin | ||
| bn := blockNumber(client); | ||
| while TTask.CurrentTask.Status <> TTaskStatus.Canceled do | ||
| begin | ||
| logs := web3.eth.logs.getAsLog(client, bn, address); | ||
| for log in logs do | ||
| begin | ||
| bn := BigInteger.Max(bn, log.BlockNumber.Succ); | ||
| callback(log); | ||
| end; | ||
| end; | ||
| end); | ||
| end; | ||
|
|
||
| end. |
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