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Merge pull request #1026 from libgit2/jamill/set_error
Try harder to format error messages
2 parents 7f0cc1e + 983ce49 commit 8febb35

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4 files changed

+244
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‎LibGit2Sharp.Tests/LibGit2Sharp.Tests.csproj

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@@ -63,6 +63,7 @@
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<Compile Include="RefSpecFixture.cs" />
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<Compile Include="EqualityFixture.cs" />
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<Compile Include="RevertFixture.cs" />
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<Compile Include="SetErrorFixture.cs" />
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<Compile Include="SignatureFixture.cs" />
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<Compile Include="FilterBranchFixture.cs" />
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<Compile Include="RemoveFixture.cs" />

‎LibGit2Sharp.Tests/SetErrorFixture.cs

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@@ -0,0 +1,182 @@
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using System;
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using System.IO;
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using System.Text;
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using LibGit2Sharp.Tests.TestHelpers;
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using Xunit;
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namespace LibGit2Sharp.Tests
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{
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public class SetErrorFixture : BaseFixture
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{
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private const string simpleExceptionMessage = "This is a simple exception message.";
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private const string aggregateExceptionMessage = "This is aggregate exception.";
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private const string outerExceptionMessage = "This is an outer exception.";
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private const string innerExceptionMessage = "This is an inner exception.";
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private const string innerExceptionMessage2 = "This is inner exception #2.";
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private const string expectedInnerExceptionHeaderText = "Inner Exception:";
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private const string expectedAggregateExceptionHeaderText = "Contained Exception:";
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private const string expectedAggregateExceptionsHeaderText = "Contained Exceptions:";
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[Fact]
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public void FormatSimpleException()
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{
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Exception exceptionToThrow = new Exception(simpleExceptionMessage);
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string expectedMessage = simpleExceptionMessage;
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AssertExpectedExceptionMessage(expectedMessage, exceptionToThrow);
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}
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[Fact]
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public void FormatExceptionWithInnerException()
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{
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Exception exceptionToThrow = new Exception(outerExceptionMessage, new Exception(innerExceptionMessage));
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StringBuilder sb = new StringBuilder();
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sb.AppendLine(outerExceptionMessage);
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sb.AppendLine();
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AppendIndentedLine(sb, expectedInnerExceptionHeaderText, 0);
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AppendIndentedText(sb, innerExceptionMessage, 1);
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string expectedMessage = sb.ToString();
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AssertExpectedExceptionMessage(expectedMessage, exceptionToThrow);
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}
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[Fact]
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public void FormatAggregateException()
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{
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Exception exceptionToThrow = new AggregateException(aggregateExceptionMessage, new Exception(innerExceptionMessage), new Exception(innerExceptionMessage2));
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StringBuilder sb = new StringBuilder();
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sb.AppendLine(aggregateExceptionMessage);
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sb.AppendLine();
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AppendIndentedLine(sb, expectedAggregateExceptionsHeaderText, 0);
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AppendIndentedLine(sb, innerExceptionMessage, 1);
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sb.AppendLine();
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AppendIndentedText(sb, innerExceptionMessage2, 1);
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string expectedMessage = sb.ToString();
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AssertExpectedExceptionMessage(expectedMessage, exceptionToThrow);
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}
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private void AssertExpectedExceptionMessage(string expectedMessage, Exception exceptionToThrow)
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{
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Exception thrownException = null;
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ObjectId id = new ObjectId("deadbeefdeadbeefdeadbeefdeadbeefdeadbeef");
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string repoPath = InitNewRepository();
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using (var repo = new Repository(repoPath))
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{
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repo.ObjectDatabase.AddBackend(new ThrowingOdbBackend(exceptionToThrow), priority: 1);
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try
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{
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repo.Lookup<Blob>(id);
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}
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catch (Exception ex)
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{
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thrownException = ex;
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}
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}
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Assert.NotNull(thrownException);
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Assert.Equal(expectedMessage, thrownException.Message);
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}
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private void AppendIndentedText(StringBuilder sb, string text, int indentLevel)
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{
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sb.AppendFormat("{0}{1}", IndentString(indentLevel), text);
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}
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private void AppendIndentedLine(StringBuilder sb, string text, int indentLevel)
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{
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sb.AppendFormat("{0}{1}{2}", IndentString(indentLevel), text, Environment.NewLine);
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}
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private string IndentString(int level)
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{
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return new string(' ', level * 4);
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}
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#region ThrowingOdbBackend
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private class ThrowingOdbBackend : OdbBackend
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{
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private Exception exceptionToThrow;
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public ThrowingOdbBackend(Exception exceptionToThrow)
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{
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this.exceptionToThrow = exceptionToThrow;
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}
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protected override OdbBackendOperations SupportedOperations
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{
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get
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{
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return OdbBackendOperations.Read |
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OdbBackendOperations.ReadPrefix |
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OdbBackendOperations.Write |
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OdbBackendOperations.WriteStream |
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OdbBackendOperations.Exists |
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OdbBackendOperations.ExistsPrefix |
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OdbBackendOperations.ForEach |
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OdbBackendOperations.ReadHeader;
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}
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}
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public override int Read(ObjectId oid, out UnmanagedMemoryStream data, out ObjectType objectType)
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{
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throw this.exceptionToThrow;
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}
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public override int ReadPrefix(string shortSha, out ObjectId id, out UnmanagedMemoryStream data, out ObjectType objectType)
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{
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throw this.exceptionToThrow;
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}
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public override int Write(ObjectId oid, Stream dataStream, long length, ObjectType objectType)
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{
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throw this.exceptionToThrow;
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}
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public override int WriteStream(long length, ObjectType objectType, out OdbBackendStream stream)
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{
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throw this.exceptionToThrow;
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}
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public override bool Exists(ObjectId oid)
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{
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throw this.exceptionToThrow;
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}
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public override int ExistsPrefix(string shortSha, out ObjectId found)
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{
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throw this.exceptionToThrow;
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}
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public override int ReadHeader(ObjectId oid, out int length, out ObjectType objectType)
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{
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throw this.exceptionToThrow;
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}
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public override int ReadStream(ObjectId oid, out OdbBackendStream stream)
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{
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throw this.exceptionToThrow;
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}
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public override int ForEach(ForEachCallback callback)
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{
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throw this.exceptionToThrow;
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}
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}
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#endregion
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}
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}

‎LibGit2Sharp/Core/NativeMethods.cs

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@@ -85,7 +85,7 @@ static NativeMethods()
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[DllImport(libgit2)]
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internal static extern void giterr_set_str(
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GitErrorCategory error_class,
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string errorString);
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[MarshalAs(UnmanagedType.CustomMarshaler, MarshalCookie = UniqueId.UniqueIdentifier, MarshalTypeRef = typeof(StrictUtf8Marshaler))] string errorString);
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[DllImport(libgit2)]
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internal static extern void giterr_set_oom();

‎LibGit2Sharp/Core/Proxy.cs

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@@ -4,6 +4,7 @@
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using System.IO;
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using System.Linq;
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using System.Runtime.InteropServices;
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using System.Text;
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using System.Threading;
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using LibGit2Sharp.Core.Handles;
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using LibGit2Sharp.Handlers;
@@ -23,7 +24,7 @@ public static void giterr_set_str(GitErrorCategory error_class, Exception except
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}
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else
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{
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NativeMethods.giterr_set_str(error_class, exception.Message);
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NativeMethods.giterr_set_str(error_class, ErrorMessageFromException(exception));
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}
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}
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@@ -32,6 +33,64 @@ public static void giterr_set_str(GitErrorCategory error_class, String errorStri
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NativeMethods.giterr_set_str(error_class, errorString);
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}
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/// <summary>
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/// This method will take an exception and try to generate an error message
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/// that captures the important messages of the error.
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/// The formatting is a bit subjective.
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/// </summary>
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/// <param name="ex"></param>
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/// <returns></returns>
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public static string ErrorMessageFromException(Exception ex)
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{
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StringBuilder sb = new StringBuilder();
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BuildErrorMessageFromException(sb, 0, ex);
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return sb.ToString();
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}
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private static void BuildErrorMessageFromException(StringBuilder sb, int level, Exception ex)
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{
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string indent = new string(' ', level * 4);
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sb.AppendFormat("{0}{1}", indent, ex.Message);
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if (ex is AggregateException)
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{
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AggregateException aggregateException = ((AggregateException)ex).Flatten();
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if (aggregateException.InnerExceptions.Count == 1)
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{
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sb.AppendLine();
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sb.AppendLine();
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sb.AppendFormat("{0}Contained Exception:{1}", indent, Environment.NewLine);
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BuildErrorMessageFromException(sb, level + 1, aggregateException.InnerException);
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}
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else
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{
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sb.AppendLine();
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sb.AppendLine();
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sb.AppendFormat("{0}Contained Exceptions:{1}", indent, Environment.NewLine);
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for (int i = 0; i < aggregateException.InnerExceptions.Count; i++)
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{
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if (i != 0)
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{
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sb.AppendLine();
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sb.AppendLine();
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}
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BuildErrorMessageFromException(sb, level + 1, aggregateException.InnerExceptions[i]);
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}
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}
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}
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else if (ex.InnerException != null)
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{
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sb.AppendLine();
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sb.AppendLine();
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sb.AppendFormat("{0}Inner Exception:{1}", indent, Environment.NewLine);
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BuildErrorMessageFromException(sb, level + 1, ex.InnerException);
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}
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}
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#endregion
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#region git_blame_

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