Blobinspector: trace level logging with --verbose (#3313)

tools/blobinspector/build.gradle

@@ -4,7 +4,8 @@ apply plugin: 'kotlin'
 dependencies {
     compile project(':client:jackson')
     compile 'info.picocli:picocli:3.0.0'
-    compile "org.slf4j:slf4j-nop:$slf4j_version"
+    compile "org.slf4j:jul-to-slf4j:$slf4j_version"
+    compile "org.apache.logging.log4j:log4j-slf4j-impl:$log4j_version"
     compile "com.jcabi:jcabi-manifests:$jcabi_manifests_version"
 
     testCompile project(':test-utils')

tools/blobinspector/src/main/kotlin/net/corda/blobinspector/Main.kt

@@ -4,6 +4,7 @@ import com.fasterxml.jackson.core.JsonFactory
 import com.fasterxml.jackson.dataformat.yaml.YAMLFactory
 import com.jcabi.manifests.Manifests
 import net.corda.client.jackson.JacksonSupport
+import net.corda.core.internal.isRegularFile
 import net.corda.core.internal.rootMessage
 import net.corda.core.serialization.SerializationContext
 import net.corda.core.serialization.deserialize
@@ -63,6 +64,8 @@ class Main : Runnable {
     var verbose: Boolean = false
 
     override fun run() {
+        System.setProperty("logLevel", if (verbose) "trace" else "off")
+
         val bytes = source!!.readBytes().run {
             require(size > amqpMagic.size) { "Insufficient bytes for AMQP blob" }
             sequence()
@@ -74,6 +77,8 @@ class Main : Runnable {
             val envelope = DeserializationInput.getEnvelope(bytes)
             println(envelope.schema)
             println()
+            println(envelope.transformsSchema)
+            println()
         }
 
         initialiseSerialization()
@@ -112,7 +117,9 @@ private class SourceConverter : ITypeConverter<URL> {
         return try {
             URL(value)
         } catch (e: MalformedURLException) {
-            Paths.get(value).toUri().toURL()
+            val path = Paths.get(value)
+            require(path.isRegularFile()) { "$path is not a file" }
+            path.toUri().toURL()
         }
     }
 }

tools/blobinspector/src/main/resources/log4j2.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Configuration status="info">
+    <Appenders>
+        <Console name="STDOUT" target="SYSTEM_OUT" ignoreExceptions="false">
+            <PatternLayout pattern="[%C{1}.%M] %m%n"/>
+        </Console>
+    </Appenders>
+    <Loggers>
+        <Root level="${sys:logLevel}">
+            <AppenderRef ref="STDOUT"/>
+        </Root>
+    </Loggers>
+</Configuration>