io.datakernel.http.DebugStacktraceRenderer Maven / Gradle / Ivy

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package io.datakernel.http;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * This is a util class that provides a mean to render any exception into an {@link HttpResponse}
 * with the stacktrace rendered nicely.
 * It also generates link to the IntelliJ IDEA REST API (http://localhost:63342) from the stacktrace,
 * just like IDEA does in its log console.
 */
public final class DebugStacktraceRenderer {
	private static final String IDEA_REST_API_URL = "http://localhost:63342";
	private static final String DEBUG_SERVER_ERROR_HTML = "" +
			"" +
			"" +
			"" +
			"Internal Server Error" +
			"" +
			"" +
			"" +
			"" +
			"" +
			"Internal Server Error" +
			"" +
			"{stacktrace}" +
			"" +
			"" +
			"DataKernel 3.0.0" +
			"" +
			"" +
			"" +
			"";

	private static final Pattern STACK_TRACE_ELEMENT;

	static {
		String ident = "\\p{javaJavaIdentifierStart}\\p{javaJavaIdentifierPart}*";
		STACK_TRACE_ELEMENT = Pattern.compile("(at ((?:" + ident + "\\.)+)" + ident + "\\()(" + ident + "(\\." + ident + ")(:\\d+)?)\\)");
	}

	public static HttpResponse render(Throwable e) {
		StringWriter writer = new StringWriter();
		e.printStackTrace(new PrintWriter(writer));
		Matcher matcher = STACK_TRACE_ELEMENT.matcher(writer.toString());
		StringBuffer stacktrace = new StringBuffer();
		while (matcher.find()) {
			String cls = matcher.group(2);
			String quotedFile = Matcher.quoteReplacement(cls.substring(0, cls.length() - 1).replace('.', '/').replaceAll("\\$.*(?:\\.|$)", ""));
			matcher.appendReplacement(stacktrace, "$1$3)");
		}
		matcher.appendTail(stacktrace);
		return HttpResponse.ofCode(500)
				.withHtml(DEBUG_SERVER_ERROR_HTML.replace("{stacktrace}", stacktrace));
	}
}