[WIP] Upgrade aelf bridge oracle client.

.gitignore

@@ -296,4 +296,6 @@ aelf.js
 Contracts.manifest
 
 # Contract patcher dlls
-chain/scripts/patcher/*
+scripts/patcher/*
+src/AElf.Boilerplate.Launcher/contracts/*
+test/patched/*

AElf.Contracts.PortAll.sln

@@ -16,8 +16,6 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AElf.Boilerplate.TestBase",
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AElf.Contracts.Oracle", "contract\AElf.Contracts.Oracle\AElf.Contracts.Oracle.csproj", "{AC06E580-EFC8-4D3F-BA4A-B2D2D1F65B9F}"
 EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "AElf.Contracts.Oracle.Tests", "test\AElf.Contracts.Oracle.Tests\AElf.Contracts.Oracle.Tests.csproj", "{3631B538-C617-4FCE-9C9B-1D1B5F290A7F}"
-EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AElf.Boilerplate.ContractPatcher", "src\AElf.Boilerplate.ContractPatcher\AElf.Boilerplate.ContractPatcher.csproj", "{DCC207EA-842A-4B54-858B-295CAA8947D5}"
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AElf.Contracts.OracleUser", "contract\AElf.Contracts.OracleUser\AElf.Contracts.OracleUser.csproj", "{1A8F790C-4172-426C-83E3-2B49589782AB}"
@@ -46,22 +44,45 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AElf.Contracts.TokenLockRec
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AElf.Contracts.Lottery", "contract\AElf.Contracts.Lottery\AElf.Contracts.Lottery.csproj", "{BDB841AC-3230-4EBF-A735-EEF30CDE20ED}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AElf.Contracts.Lottery.Tests", "test\AElf.Contracts.Lottery.Tests\AElf.Contracts.Lottery.Tests.csproj", "{073D711D-9F38-472D-ACE2-9830A222768C}"
-EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AElf.TokenSwap", "src\AElf.TokenSwap\AElf.TokenSwap.csproj", "{AFFFAFFC-992F-4A88-95A8-C395D04B36D3}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AElf.Contracts.Bridge.Tests", "test\AElf.Contracts.Bridge.Tests\AElf.Contracts.Bridge.Tests.csproj", "{463F5276-2D88-4A66-AA45-688F1920E1D7}"
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "modules", "modules", "{FDE8EA32-0CD6-464B-A974-B6C3A3FB7039}"
+	ProjectSection(SolutionItems) = preProject
+		modules\AElf.Nethereum.Core\obj\Debug\net6.0\.NETCoreApp,Version = v6.0.AssemblyAttributes.cs = modules\AElf.Nethereum.Core\obj\Debug\net6.0\.NETCoreApp,Version=v6.0.AssemblyAttributes.cs
+	EndProjectSection
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AElf.Client", "modules\AElf.Client\AElf.Client.csproj", "{45B743E6-3B58-4AFA-9782-EA67015C9CD3}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AElf.Client.Core", "modules\AElf.Client.Core\AElf.Client.Core.csproj", "{8E6296BA-D3A6-4C23-837C-8A40A6BE3822}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AElf.Client.Oracle", "modules\AElf.Client.Oracle\AElf.Client.Oracle.csproj", "{EA90104B-835D-4700-B0CD-93045173C033}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AElf.Client.Protobuf", "modules\AElf.Client.Protobuf\AElf.Client.Protobuf.csproj", "{60CE45CF-3CF2-47DD-BE40-DB5585A5B0DE}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AElf.Client.Report", "modules\AElf.Client.Report\AElf.Client.Report.csproj", "{E4400680-1754-48A9-BEE9-8A6BC79302C2}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AElf.Client.MerkleTree", "modules\AElf.Client.MerkleTree\AElf.Client.MerkleTree.csproj", "{538194EF-9329-4C90-8BD9-0E6EFDFEF691}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AElf.Nethereum.Core", "modules\AElf.Nethereum.Core\AElf.Nethereum.Core.csproj", "{4175F31E-5ED6-4B67-973C-51B0C44BE74B}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AElf.Client.Bridge", "modules\AElf.Client.Bridge\AElf.Client.Bridge.csproj", "{ADD0EBAC-F957-4D59-AF43-C10D31DFB2DA}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AElf.Nethereum.Bridge", "modules\AElf.Nethereum.Bridge\AElf.Nethereum.Bridge.csproj", "{1AC48421-CF85-44B9-B79A-6D41F8C09FF8}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AElf.BlockchainTransactionFee", "modules\AElf.BlockchainTransactionFee\AElf.BlockchainTransactionFee.csproj", "{0D9CCDEA-1E0B-4428-8DA7-F040CD971816}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AElf.TokenPrice.Abstractions", "modules\AElf.TokenPrice.Abstractions\AElf.TokenPrice.Abstractions.csproj", "{F51259FD-7510-4166-8E96-C0C13DFA811F}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AElf.TokenPrice.CoinGecko", "modules\AElf.TokenPrice.CoinGecko\AElf.TokenPrice.CoinGecko.csproj", "{94EB8357-3CE0-4750-A167-8BCF7740BFB2}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AElf.PriceWorker", "src\AElf.PriceWorker\AElf.PriceWorker.csproj", "{63E22799-0213-42B3-A751-1592349180B9}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
 		Release|Any CPU = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{3631B538-C617-4FCE-9C9B-1D1B5F290A7F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{3631B538-C617-4FCE-9C9B-1D1B5F290A7F}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{3631B538-C617-4FCE-9C9B-1D1B5F290A7F}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{3631B538-C617-4FCE-9C9B-1D1B5F290A7F}.Release|Any CPU.Build.0 = Release|Any CPU
 		{9484A7A9-CA57-4FF4-9FD8-27BFEF92EDBC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{9484A7A9-CA57-4FF4-9FD8-27BFEF92EDBC}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{9484A7A9-CA57-4FF4-9FD8-27BFEF92EDBC}.Release|Any CPU.ActiveCfg = Release|Any CPU
@@ -126,24 +147,67 @@ Global
 		{BDB841AC-3230-4EBF-A735-EEF30CDE20ED}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{BDB841AC-3230-4EBF-A735-EEF30CDE20ED}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{BDB841AC-3230-4EBF-A735-EEF30CDE20ED}.Release|Any CPU.Build.0 = Release|Any CPU
-		{073D711D-9F38-472D-ACE2-9830A222768C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{073D711D-9F38-472D-ACE2-9830A222768C}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{073D711D-9F38-472D-ACE2-9830A222768C}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{073D711D-9F38-472D-ACE2-9830A222768C}.Release|Any CPU.Build.0 = Release|Any CPU
 		{AFFFAFFC-992F-4A88-95A8-C395D04B36D3}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{AFFFAFFC-992F-4A88-95A8-C395D04B36D3}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{AFFFAFFC-992F-4A88-95A8-C395D04B36D3}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{AFFFAFFC-992F-4A88-95A8-C395D04B36D3}.Release|Any CPU.Build.0 = Release|Any CPU
-		{463F5276-2D88-4A66-AA45-688F1920E1D7}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{463F5276-2D88-4A66-AA45-688F1920E1D7}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{463F5276-2D88-4A66-AA45-688F1920E1D7}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{463F5276-2D88-4A66-AA45-688F1920E1D7}.Release|Any CPU.Build.0 = Release|Any CPU
+		{45B743E6-3B58-4AFA-9782-EA67015C9CD3}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{45B743E6-3B58-4AFA-9782-EA67015C9CD3}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{45B743E6-3B58-4AFA-9782-EA67015C9CD3}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{45B743E6-3B58-4AFA-9782-EA67015C9CD3}.Release|Any CPU.Build.0 = Release|Any CPU
+		{8E6296BA-D3A6-4C23-837C-8A40A6BE3822}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{8E6296BA-D3A6-4C23-837C-8A40A6BE3822}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{8E6296BA-D3A6-4C23-837C-8A40A6BE3822}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{8E6296BA-D3A6-4C23-837C-8A40A6BE3822}.Release|Any CPU.Build.0 = Release|Any CPU
+		{EA90104B-835D-4700-B0CD-93045173C033}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{EA90104B-835D-4700-B0CD-93045173C033}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{EA90104B-835D-4700-B0CD-93045173C033}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{EA90104B-835D-4700-B0CD-93045173C033}.Release|Any CPU.Build.0 = Release|Any CPU
+		{60CE45CF-3CF2-47DD-BE40-DB5585A5B0DE}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{60CE45CF-3CF2-47DD-BE40-DB5585A5B0DE}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{60CE45CF-3CF2-47DD-BE40-DB5585A5B0DE}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{60CE45CF-3CF2-47DD-BE40-DB5585A5B0DE}.Release|Any CPU.Build.0 = Release|Any CPU
+		{E4400680-1754-48A9-BEE9-8A6BC79302C2}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E4400680-1754-48A9-BEE9-8A6BC79302C2}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E4400680-1754-48A9-BEE9-8A6BC79302C2}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E4400680-1754-48A9-BEE9-8A6BC79302C2}.Release|Any CPU.Build.0 = Release|Any CPU
+		{538194EF-9329-4C90-8BD9-0E6EFDFEF691}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{538194EF-9329-4C90-8BD9-0E6EFDFEF691}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{538194EF-9329-4C90-8BD9-0E6EFDFEF691}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{538194EF-9329-4C90-8BD9-0E6EFDFEF691}.Release|Any CPU.Build.0 = Release|Any CPU
+		{4175F31E-5ED6-4B67-973C-51B0C44BE74B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{4175F31E-5ED6-4B67-973C-51B0C44BE74B}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{4175F31E-5ED6-4B67-973C-51B0C44BE74B}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{4175F31E-5ED6-4B67-973C-51B0C44BE74B}.Release|Any CPU.Build.0 = Release|Any CPU
+		{ADD0EBAC-F957-4D59-AF43-C10D31DFB2DA}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{ADD0EBAC-F957-4D59-AF43-C10D31DFB2DA}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{ADD0EBAC-F957-4D59-AF43-C10D31DFB2DA}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{ADD0EBAC-F957-4D59-AF43-C10D31DFB2DA}.Release|Any CPU.Build.0 = Release|Any CPU
+		{1AC48421-CF85-44B9-B79A-6D41F8C09FF8}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{1AC48421-CF85-44B9-B79A-6D41F8C09FF8}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{1AC48421-CF85-44B9-B79A-6D41F8C09FF8}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{1AC48421-CF85-44B9-B79A-6D41F8C09FF8}.Release|Any CPU.Build.0 = Release|Any CPU
+		{0D9CCDEA-1E0B-4428-8DA7-F040CD971816}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{0D9CCDEA-1E0B-4428-8DA7-F040CD971816}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{0D9CCDEA-1E0B-4428-8DA7-F040CD971816}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{0D9CCDEA-1E0B-4428-8DA7-F040CD971816}.Release|Any CPU.Build.0 = Release|Any CPU
+		{F51259FD-7510-4166-8E96-C0C13DFA811F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{F51259FD-7510-4166-8E96-C0C13DFA811F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{F51259FD-7510-4166-8E96-C0C13DFA811F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{F51259FD-7510-4166-8E96-C0C13DFA811F}.Release|Any CPU.Build.0 = Release|Any CPU
+		{94EB8357-3CE0-4750-A167-8BCF7740BFB2}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{94EB8357-3CE0-4750-A167-8BCF7740BFB2}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{94EB8357-3CE0-4750-A167-8BCF7740BFB2}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{94EB8357-3CE0-4750-A167-8BCF7740BFB2}.Release|Any CPU.Build.0 = Release|Any CPU
+		{63E22799-0213-42B3-A751-1592349180B9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{63E22799-0213-42B3-A751-1592349180B9}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{63E22799-0213-42B3-A751-1592349180B9}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{63E22799-0213-42B3-A751-1592349180B9}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
 	EndGlobalSection
 	GlobalSection(NestedProjects) = preSolution
-		{3631B538-C617-4FCE-9C9B-1D1B5F290A7F} = {DBC47323-E6A2-42A2-A624-CE2EE6139567}
 		{AC06E580-EFC8-4D3F-BA4A-B2D2D1F65B9F} = {5C980166-C987-470D-AEE0-3858A170A903}
 		{F72731A8-5803-4362-834F-0C066E64D4CD} = {21D85A91-5BB8-4912-8107-49435A461AAC}
 		{DCC207EA-842A-4B54-858B-295CAA8947D5} = {21D85A91-5BB8-4912-8107-49435A461AAC}
@@ -160,9 +224,20 @@ Global
 		{4F30B2D8-432C-4686-81B5-9ADFE905B2B9} = {5C980166-C987-470D-AEE0-3858A170A903}
 		{B0145883-39B3-440E-9BA1-D80F13701E5C} = {5C980166-C987-470D-AEE0-3858A170A903}
 		{BDB841AC-3230-4EBF-A735-EEF30CDE20ED} = {5C980166-C987-470D-AEE0-3858A170A903}
-		{073D711D-9F38-472D-ACE2-9830A222768C} = {DBC47323-E6A2-42A2-A624-CE2EE6139567}
 		{AFFFAFFC-992F-4A88-95A8-C395D04B36D3} = {21D85A91-5BB8-4912-8107-49435A461AAC}
-		{463F5276-2D88-4A66-AA45-688F1920E1D7} = {DBC47323-E6A2-42A2-A624-CE2EE6139567}
+		{45B743E6-3B58-4AFA-9782-EA67015C9CD3} = {FDE8EA32-0CD6-464B-A974-B6C3A3FB7039}
+		{8E6296BA-D3A6-4C23-837C-8A40A6BE3822} = {FDE8EA32-0CD6-464B-A974-B6C3A3FB7039}
+		{EA90104B-835D-4700-B0CD-93045173C033} = {FDE8EA32-0CD6-464B-A974-B6C3A3FB7039}
+		{60CE45CF-3CF2-47DD-BE40-DB5585A5B0DE} = {FDE8EA32-0CD6-464B-A974-B6C3A3FB7039}
+		{E4400680-1754-48A9-BEE9-8A6BC79302C2} = {FDE8EA32-0CD6-464B-A974-B6C3A3FB7039}
+		{538194EF-9329-4C90-8BD9-0E6EFDFEF691} = {FDE8EA32-0CD6-464B-A974-B6C3A3FB7039}
+		{4175F31E-5ED6-4B67-973C-51B0C44BE74B} = {FDE8EA32-0CD6-464B-A974-B6C3A3FB7039}
+		{ADD0EBAC-F957-4D59-AF43-C10D31DFB2DA} = {FDE8EA32-0CD6-464B-A974-B6C3A3FB7039}
+		{1AC48421-CF85-44B9-B79A-6D41F8C09FF8} = {FDE8EA32-0CD6-464B-A974-B6C3A3FB7039}
+		{0D9CCDEA-1E0B-4428-8DA7-F040CD971816} = {FDE8EA32-0CD6-464B-A974-B6C3A3FB7039}
+		{F51259FD-7510-4166-8E96-C0C13DFA811F} = {FDE8EA32-0CD6-464B-A974-B6C3A3FB7039}
+		{94EB8357-3CE0-4750-A167-8BCF7740BFB2} = {FDE8EA32-0CD6-464B-A974-B6C3A3FB7039}
+		{63E22799-0213-42B3-A751-1592349180B9} = {21D85A91-5BB8-4912-8107-49435A461AAC}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {D7426B41-E959-40E4-9ED8-ED8D9C50F133}

modules/AElf.BlockchainTransactionFee/AElf.BlockchainTransactionFee.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net6.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <PackageReference Include="Volo.Abp.Caching" Version="5.2.2" />
+      <PackageReference Include="Volo.Abp.Core" Version="5.2.2" />
+    </ItemGroup>
+
+</Project>

modules/AElf.BlockchainTransactionFee/AElfBlockchainTransactionFeeModule.cs

@@ -0,0 +1,19 @@
+using Microsoft.Extensions.DependencyInjection;
+using Volo.Abp.Caching;
+using Volo.Abp.Modularity;
+
+namespace AElf.BlockchainTransactionFee
+{
+    [DependsOn(typeof(AbpCachingModule))]
+    public class AElfBlockchainTransactionFeeModule : AbpModule
+    {
+        public override void ConfigureServices(ServiceConfigurationContext context)
+        {
+            var configuration = context.Services.GetConfiguration();
+            Configure<ChainExplorerApiOptions>(configuration.GetSection("ChainExplorerApi"));            
+            context.Services.AddTransient<ApiClient>();
+            context.Services.AddTransient<IBlockchainTransactionFeeProvider, EthereumTransactionFeeProvider>();
+            context.Services.AddTransient<IBlockchainTransactionFeeProvider, BSCTransactionFeeProvider>();
+        }
+    }
+}

modules/AElf.BlockchainTransactionFee/ApiClient.cs

@@ -0,0 +1,32 @@
+using System.Net;
+using System.Text.Json;
+using Newtonsoft.Json;
+
+namespace AElf.BlockchainTransactionFee;
+
+public class ApiClient
+{
+    private readonly HttpClient _httpClient;
+
+    public ApiClient()
+    {
+        _httpClient = new HttpClient();
+    }
+
+    public async Task<T> GetAsync<T>(string uri)
+    {
+        var response = await _httpClient.GetAsync(uri)
+            .ConfigureAwait(false);
+        response.EnsureSuccessStatusCode();
+
+        var responseContent = await response.Content.ReadAsStringAsync();
+        try
+        {
+            return JsonConvert.DeserializeObject<T>(responseContent);
+        }
+        catch (Exception e)
+        {
+            throw new HttpRequestException(e.Message);
+        }
+    }
+}

modules/AElf.BlockchainTransactionFee/BSCTransactionFeeProvider.cs

@@ -0,0 +1,52 @@
+using Microsoft.Extensions.Options;
+using Volo.Abp.DependencyInjection;
+
+namespace AElf.BlockchainTransactionFee;
+
+public class BSCTransactionFeeProvider : IBlockchainTransactionFeeProvider
+{
+    public string BlockChain { get; } = "BSC";
+
+    private readonly ApiClient _apiClient;
+
+    private readonly ChainExplorerApiOptions _chainExplorerApiOptions;
+
+    public BSCTransactionFeeProvider(ApiClient apiClient,
+        IOptionsSnapshot<ChainExplorerApiOptions> blockchainExplorerApiOptions)
+    {
+        _apiClient = apiClient;
+        _chainExplorerApiOptions = blockchainExplorerApiOptions.Value;
+    }
+
+    public async Task<TransactionFeeDto> GetTransactionFee()
+    {
+        var result = await _apiClient.GetAsync<BSCApiResult<BSCGasTracker>>(
+            $"https://api.bscscan.com/api?module=gastracker&action=gasoracle&apikey={_chainExplorerApiOptions.ApiKeys[BlockChain]}");
+        if (result.Message != "OK")
+        {
+            throw new HttpRequestException($"BSC api failed: {result.Message}");
+        }
+
+        return new TransactionFeeDto
+        {
+            Symbol = "BNB",
+            Fee = decimal.Parse(result.Result.SafeGasPrice)
+        };
+    }
+}
+
+public class BSCApiResult<T>
+{
+    public string Message { get; set; }
+
+    public T Result { get; set; }
+}
+
+public class BSCGasTracker
+{
+    public string FastGasPrice { get; set; }
+    public string LastBlock { get; set; }
+    public string ProposeGasPrice { get; set; }
+    public string SafeGasPrice { get; set; }
+    public string UsdPrice { get; set; }
+}

modules/AElf.BlockchainTransactionFee/ChainExplorerApiOptions.cs

@@ -0,0 +1,6 @@
+namespace AElf.BlockchainTransactionFee;
+
+public class ChainExplorerApiOptions
+{
+    public Dictionary<string, string> ApiKeys { get; set; } = new();
+}

modules/AElf.BlockchainTransactionFee/EthereumTransactionFeeProvider.cs

@@ -0,0 +1,51 @@
+using Microsoft.Extensions.Options;
+using Volo.Abp.DependencyInjection;
+
+namespace AElf.BlockchainTransactionFee;
+
+public class EthereumTransactionFeeProvider : IBlockchainTransactionFeeProvider
+{
+    public string BlockChain { get; } = "Ethereum";
+
+    private readonly ApiClient _apiClient;
+
+    private readonly ChainExplorerApiOptions _chainExplorerApiOptions;
+
+    public EthereumTransactionFeeProvider(ApiClient apiClient,
+        IOptionsSnapshot<ChainExplorerApiOptions> blockchainExplorerApiOptions)
+    {
+        _apiClient = apiClient;
+        _chainExplorerApiOptions = blockchainExplorerApiOptions.Value;
+    }
+
+    public async Task<TransactionFeeDto> GetTransactionFee()
+    {
+        var result = await _apiClient.GetAsync<EthereumApiResult<EthereumGasTracker>>(
+            $"https://api.etherscan.io/api?module=gastracker&action=gasoracle&apikey={_chainExplorerApiOptions.ApiKeys[BlockChain]}");
+        if (result.Message != "OK")
+        {
+            throw new HttpRequestException($"Ethereum api failed: {result.Message}");
+        }
+
+        return new TransactionFeeDto
+        {
+            Symbol = "ETH",
+            Fee = decimal.Parse(result.Result.SafeGasPrice)
+        };
+    }
+}
+
+public class EthereumApiResult<T>
+{
+    public string Message { get; set; }
+
+    public T Result { get; set; }
+}
+
+public class EthereumGasTracker
+{
+    public string FastGasPrice { get; set; }
+    public string LastBlock { get; set; }
+    public string ProposeGasPrice { get; set; }
+    public string SafeGasPrice { get; set; }
+}

modules/AElf.BlockchainTransactionFee/IBlockchainTransactionFeeProvider.cs

@@ -0,0 +1,7 @@
+namespace AElf.BlockchainTransactionFee;
+
+public interface IBlockchainTransactionFeeProvider
+{
+    string BlockChain { get; }
+    Task<TransactionFeeDto> GetTransactionFee();
+}

modules/AElf.BlockchainTransactionFee/IBlockchainTransactionFeeService.cs

@@ -0,0 +1,30 @@
+using Microsoft.Extensions.Caching.Distributed;
+using Volo.Abp.Caching;
+using Volo.Abp.DependencyInjection;
+
+namespace AElf.BlockchainTransactionFee;
+
+public interface IBlockchainTransactionFeeService
+{
+    Task<TransactionFeeDto> GetTransactionFeeAsync(string chainName);
+}
+
+public class BlockchainTransactionFeeService : IBlockchainTransactionFeeService, ITransientDependency
+{
+    private readonly IEnumerable<IBlockchainTransactionFeeProvider> _blockchainTransactionFeeProviders;
+
+    public BlockchainTransactionFeeService(
+        IEnumerable<IBlockchainTransactionFeeProvider> blockchainTransactionFeeProviders)
+    {
+        _blockchainTransactionFeeProviders = blockchainTransactionFeeProviders;
+    }
+
+    public async Task<TransactionFeeDto> GetTransactionFeeAsync(string chainName)
+    {
+        var provider = _blockchainTransactionFeeProviders.First(o => o.BlockChain == chainName);
+        var fee = await provider.GetTransactionFee();
+        return fee;
+    }
+}
+
+