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SuggestionStore::GetCompletions to check exit code of invoked applica… #2160

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d3e8b47
SuggestionStore::GetCompletions to check exit code of invoked applica…
baradgur Apr 11, 2023
1c23816
SuggestionStore::GetCompletions to check exit code of invoked applica…
baradgur Apr 12, 2023
65a92f5
added tests to SuggestionStore::GetCompletions
baradgur Apr 13, 2023
d8adba7
use async read for standard output for SuggestionStore::GetCompletions
baradgur Apr 14, 2023
8b8e3b7
stopping async read in SuggestionStore::GetCompletions gracefully
baradgur Apr 14, 2023
8895dfd
Merge remote-tracking branch 'remotes/origin/main' into issue-2137
baradgur Jun 7, 2023
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15 changes: 13 additions & 2 deletions src/System.CommandLine.Suggest/SuggestionStore.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@
using System.ComponentModel;
using System.Diagnostics;
using System.IO;
using System.Text;
using System.Threading.Tasks;

namespace System.CommandLine.Suggest
Expand Down Expand Up @@ -41,10 +42,20 @@ public string GetCompletions(string exeFileName, string suggestionTargetArgument
})
{
process.Start();

process.BeginOutputReadLine();

var stringBuilder = new StringBuilder();
process.OutputDataReceived += (sender, eventArgs) =>
{
if (eventArgs.Data != null)
{
stringBuilder.AppendLine(eventArgs.Data);
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@KalleOlaviNiemitalo KalleOlaviNiemitalo Apr 14, 2023 •
edited
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Should be just Append, not AppendLine.
There may be a thread safety problem if there is still more data coming in during the stringBuilder.ToString() call; although the child process has exited, grandchild processes might still write to the pipe.

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Thank you, might be the mistake is here! I hope it is my last. Otherwise I am completely at loss right now on why the test keeps faling.
Regarding Append/AppendLine: seems not the case here - I have tested it, the eventArgs.Data comes without any line terminator.

}
};

if (process.WaitForExit(timeout) && process.ExitCode == 0)
{
result = process.StandardOutput.ReadToEnd();
result = stringBuilder.ToString();
}
else
{
Expand Down