problem: used slow JDK TLS

src/main/kotlin/io/emeraldpay/dshackle/TlsSetup.kt

@@ -21,6 +21,7 @@ import io.grpc.netty.GrpcSslContexts
 import io.netty.handler.ssl.ClientAuth
 import io.netty.handler.ssl.SslContext
 import io.netty.handler.ssl.SslContextBuilder
+import io.netty.handler.ssl.SslProvider
 import org.apache.commons.lang3.StringUtils
 import org.slf4j.LoggerFactory
 import org.springframework.beans.factory.annotation.Autowired
@@ -61,6 +62,10 @@ class TlsSetup(
         }
         if (mustBeSecure || (!tlsDisabled && hasServerCertificate)) {
             log.info("Using TLS for $category")
+            if (SslContext.defaultServerProvider() == SslProvider.JDK) {
+                log.warn("Using JDK TLS implementation. Install OpenSSL to better performance")
+            }
+
             val sslContextBuilder = if (grpc) {
                 GrpcSslContexts.forServer(
                         fileResolver.resolve(config.certificate!!),

src/test/groovy/io/emeraldpay/dshackle/TlsSetupSpec.groovy

@@ -19,6 +19,7 @@ package io.emeraldpay.dshackle
 import io.emeraldpay.dshackle.config.AuthConfig
 import io.netty.handler.ssl.ClientAuth
 import io.netty.handler.ssl.OpenSslServerContext
+import io.netty.handler.ssl.SslContext
 import spock.lang.Specification
 import sun.security.x509.X509CertImpl
 
@@ -73,8 +74,10 @@ class TlsSetupSpec extends Specification {
         act != null
         act.server
         !act.client
+
+        // run test on OS with OpenSSL installed
         with((OpenSslServerContext) act) {
-            act.clientAuth == ClientAuth.REQUIRE
+            clientAuth == ClientAuth.REQUIRE
             with((X509CertImpl) keyCertChain[0]) {
                 getIssuerDN().name == "CN=ca.myhost.dev, OU=Blockchain CA, O=My Company"
             }