zipkin2.server.internal.banner.ZipkinBanner Maven / Gradle / Ivy
/*
* Copyright The OpenZipkin Authors
* SPDX-License-Identifier: Apache-2.0
*/
package zipkin2.server.internal.banner;
import java.io.InputStream;
import java.io.PrintStream;
import org.springframework.boot.Banner;
import org.springframework.boot.ansi.AnsiElement;
import org.springframework.boot.ansi.AnsiOutput;
import org.springframework.boot.ansi.AnsiStyle;
import org.springframework.core.env.Environment;
import org.springframework.core.io.ClassPathResource;
import org.springframework.util.StreamUtils;
import static java.nio.charset.StandardCharsets.UTF_8;
/**
* More efficient Banner implementation which doesn't use property sources as variables are expanded
* at compile time using Maven resource filtering.
*/
public class ZipkinBanner implements Banner {
static final AnsiElement ZIPKIN_ORANGE = new AnsiElement() {
@Override public String toString() {
return "38;5;208"; // Ansi 256 color code 208 (orange)
}
};
@Override
public void printBanner(Environment environment, Class sourceClass, PrintStream out) {
try (InputStream stream = new ClassPathResource("zipkin.txt").getInputStream()) {
String banner = StreamUtils.copyToString(stream, UTF_8);
// Instead of use property expansion for only 2 ansi codes, inline them
banner = banner.replace("${AnsiOrange}", AnsiOutput.encode(ZIPKIN_ORANGE));
banner = banner.replace("${AnsiNormal}", AnsiOutput.encode(AnsiStyle.NORMAL));
out.println(banner);
} catch (Exception ex) {
// who cares
}
}
}