[libeufin] branch master updated: shared config subcommand for nexus and bank

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This is an automated email from the git hooks/post-receive script.

dold pushed a commit to branch master
in repository libeufin.

The following commit(s) were added to refs/heads/master by this push:
     new 87c42907 shared config subcommand for nexus and bank
87c42907 is described below

commit 87c42907a6b4d556f290985263f4a2ecd5b524c4
Author: Florian Dold <florian@dold.me>
AuthorDate: Mon Nov 27 19:46:44 2023 +0100

    shared config subcommand for nexus and bank
---
 .../kotlin/tech/libeufin/bank/Authentication.kt    |   4 +
 bank/src/main/kotlin/tech/libeufin/bank/Config.kt  |   2 +-
 bank/src/main/kotlin/tech/libeufin/bank/Main.kt    |  74 +------------
 .../tech/libeufin/bank/db/NotificationWatcher.kt   |   4 +
 .../kotlin/tech/libeufin/bank/db/TransactionDAO.kt |   4 +
 nexus/src/main/kotlin/tech/libeufin/nexus/Main.kt  |   2 +-
 .../kotlin/tech/libeufin/nexus/ebics/Ebics2.kt     |   4 +
 .../tech/libeufin/nexus/ebics/EbicsCommon.kt       |   6 +-
 util/build.gradle                                  |   3 +-
 util/src/main/kotlin/Config.kt                     |   3 -
 util/src/main/kotlin/ConfigCli.kt                  | 119 +++++++++++++++++++++
 util/src/main/kotlin/DB.kt                         |   1 +
 util/src/main/kotlin/HTTP.kt                       |   4 +
 util/src/main/kotlin/IbanPayto.kt                  |   4 +
 util/src/main/kotlin/TalerConfig.kt                |   5 +-
 util/src/main/kotlin/UnixDomainSocket.kt           |   8 +-
 util/src/main/kotlin/XMLUtil.kt                    |   4 +
 util/src/main/kotlin/startServer.kt                |   4 +
 util/src/main/kotlin/time.kt                       |   4 +
 19 files changed, 173 insertions(+), 86 deletions(-)

diff --git a/bank/src/main/kotlin/tech/libeufin/bank/Authentication.kt 
b/bank/src/main/kotlin/tech/libeufin/bank/Authentication.kt
index cbef0e1e..4a83e94e 100644
--- a/bank/src/main/kotlin/tech/libeufin/bank/Authentication.kt
+++ b/bank/src/main/kotlin/tech/libeufin/bank/Authentication.kt
@@ -27,9 +27,13 @@ import io.ktor.util.pipeline.PipelineContext
 import java.time.Instant
 import net.taler.common.errorcodes.TalerErrorCode
 import net.taler.wallet.crypto.Base32Crockford
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
 import tech.libeufin.bank.AccountDAO.*
 import tech.libeufin.util.*
 
+private val logger: Logger = 
LoggerFactory.getLogger("tech.libeufin.bank.Authentication")
+
 private val AUTH_IS_ADMIN = AttributeKey<Boolean>("is_admin");
 
 /** Restrict route access to admin */
diff --git a/bank/src/main/kotlin/tech/libeufin/bank/Config.kt 
b/bank/src/main/kotlin/tech/libeufin/bank/Config.kt
index ce0afb23..3acee798 100644
--- a/bank/src/main/kotlin/tech/libeufin/bank/Config.kt
+++ b/bank/src/main/kotlin/tech/libeufin/bank/Config.kt
@@ -28,7 +28,7 @@ import org.slf4j.LoggerFactory
 import tech.libeufin.util.DatabaseConfig
 
 private val logger: Logger = 
LoggerFactory.getLogger("tech.libeufin.bank.Config")
-private val BANK_CONFIG_SOURCE = ConfigSource("libeufin", "libeufin-bank", 
"libeufin-bank")
+val BANK_CONFIG_SOURCE = ConfigSource("libeufin", "libeufin-bank", 
"libeufin-bank")
 
 /**
  * Application the parsed configuration.
diff --git a/bank/src/main/kotlin/tech/libeufin/bank/Main.kt 
b/bank/src/main/kotlin/tech/libeufin/bank/Main.kt
index 3f9cc132..cb380f9a 100644
--- a/bank/src/main/kotlin/tech/libeufin/bank/Main.kt
+++ b/bank/src/main/kotlin/tech/libeufin/bank/Main.kt
@@ -30,7 +30,6 @@ import io.ktor.http.*
 import io.ktor.server.application.*
 import io.ktor.server.http.content.*
 import io.ktor.serialization.kotlinx.json.*
-import io.ktor.server.application.*
 import io.ktor.server.engine.*
 import io.ktor.server.netty.*
 import io.ktor.server.plugins.*
@@ -42,7 +41,6 @@ import io.ktor.server.request.*
 import io.ktor.server.response.*
 import io.ktor.server.routing.*
 import io.ktor.utils.io.*
-import io.ktor.utils.io.jvm.javaio.*
 import java.time.Duration
 import java.util.zip.DataFormatException
 import java.util.zip.Inflater
@@ -51,7 +49,6 @@ import java.io.File
 import kotlin.system.exitProcess
 import kotlinx.coroutines.*
 import kotlinx.serialization.ExperimentalSerializationApi
-import kotlinx.serialization.descriptors.*
 import kotlinx.serialization.json.*
 import net.taler.common.errorcodes.TalerErrorCode
 import org.slf4j.Logger
@@ -395,79 +392,10 @@ class ChangePw : CliktCommand("Change account password", 
name = "passwd") {
     }
 }
 
-// TODO remove ?
-class BankConfigDump : CliktCommand("Dump the configuration", name = "dump") {
-    private val configFile by option(
-        "--config", "-c",
-        help = "set the configuration file"
-    )
-
-    override fun run() {
-        val config = talerConfig(configFile)
-        println("# install path: ${config.getInstallPath()}")
-        config.load(this.configFile)
-        println(config.stringify())
-    }
-}
-
-class BankConfigPathsub : CliktCommand("Substitute variables in a path", name 
= "pathsub") {
-    private val configFile by option(
-        "--config", "-c",
-        help = "set the configuration file"
-    )
-    private val pathExpr by argument()
-
-    override fun run() {
-        val config = talerConfig(configFile)
-        println(config.pathsub(pathExpr))
-    }
-}
-
-class BankConfigGet : CliktCommand("Lookup config value", name = "get") {
-    private val configFile by option(
-        "--config", "-c",
-        help = "set the configuration file"
-    )
-    private val isPath by option(
-        "--filename", "-f",
-        help = "interpret value as path with dollar-expansion"
-    ).flag()
-    private val sectionName by argument()
-    private val optionName by argument()
-
-
-    override fun run() {
-        val config = talerConfig(configFile)
-        if (isPath) {
-            val res = config.lookupPath(sectionName, optionName)
-            if (res == null) {
-                logger.error("value not found in config")
-                exitProcess(2)
-            }
-            println(res)
-        } else {
-            val res = config.lookupString(sectionName, optionName)
-            if (res == null) {
-                logger.error("value not found in config")
-                exitProcess(2)
-            }
-            println(res)
-        }
-    }
-}
-
-class BankConfigCmd : CliktCommand("Dump the configuration", name = "config") {
-    init {
-        subcommands(BankConfigDump(), BankConfigPathsub(), BankConfigGet())
-    }
-
-    override fun run() = Unit
-}
-
 class LibeufinBankCommand : CliktCommand() {
     init {
         versionOption(getVersion())
-        subcommands(ServeBank(), BankDbInit(), ChangePw(), BankConfigCmd())
+        subcommands(ServeBank(), BankDbInit(), ChangePw(), 
CliConfigCmd(BANK_CONFIG_SOURCE))
     }
 
     override fun run() = Unit
diff --git a/bank/src/main/kotlin/tech/libeufin/bank/db/NotificationWatcher.kt 
b/bank/src/main/kotlin/tech/libeufin/bank/db/NotificationWatcher.kt
index 7dddf272..8fee5341 100644
--- a/bank/src/main/kotlin/tech/libeufin/bank/db/NotificationWatcher.kt
+++ b/bank/src/main/kotlin/tech/libeufin/bank/db/NotificationWatcher.kt
@@ -24,8 +24,12 @@ import java.util.concurrent.ConcurrentHashMap
 import kotlinx.coroutines.*
 import kotlinx.coroutines.flow.*
 import org.postgresql.ds.PGSimpleDataSource
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
 import tech.libeufin.util.*
 
+private val logger: Logger = 
LoggerFactory.getLogger("tech.libeufin.util.NotificationWatcher")
+
 /** Postgres notification collector and distributor */
 internal class NotificationWatcher(private val pgSource: PGSimpleDataSource) {
     // ShareFlow that are manually counted for manual garbage collection
diff --git a/bank/src/main/kotlin/tech/libeufin/bank/db/TransactionDAO.kt 
b/bank/src/main/kotlin/tech/libeufin/bank/db/TransactionDAO.kt
index 024c37bd..38ab588b 100644
--- a/bank/src/main/kotlin/tech/libeufin/bank/db/TransactionDAO.kt
+++ b/bank/src/main/kotlin/tech/libeufin/bank/db/TransactionDAO.kt
@@ -19,10 +19,14 @@
 
 package tech.libeufin.bank
 
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
 import tech.libeufin.util.*
 import java.time.*
 import java.sql.Types
 
+private val logger: Logger = 
LoggerFactory.getLogger("tech.libeufin.util.TransactionDAO")
+
 /** Data access logic for transactions */
 class TransactionDAO(private val db: Database) {
     /** Result status of bank transaction creation .*/
diff --git a/nexus/src/main/kotlin/tech/libeufin/nexus/Main.kt 
b/nexus/src/main/kotlin/tech/libeufin/nexus/Main.kt
index 63a79102..482d6c31 100644
--- a/nexus/src/main/kotlin/tech/libeufin/nexus/Main.kt
+++ b/nexus/src/main/kotlin/tech/libeufin/nexus/Main.kt
@@ -378,7 +378,7 @@ fun TalerConfig.extractDbConfigOrFail(): DatabaseConfig =
 class LibeufinNexusCommand : CliktCommand() {
     init {
         versionOption(getVersion())
-        subcommands(EbicsSetup(), DbInit(), EbicsSubmit(), EbicsFetch())
+        subcommands(EbicsSetup(), DbInit(), EbicsSubmit(), EbicsFetch(), 
CliConfigCmd(NEXUS_CONFIG_SOURCE))
     }
     override fun run() = Unit
 }
diff --git a/nexus/src/main/kotlin/tech/libeufin/nexus/ebics/Ebics2.kt 
b/nexus/src/main/kotlin/tech/libeufin/nexus/ebics/Ebics2.kt
index 496ee8cd..e8705f85 100644
--- a/nexus/src/main/kotlin/tech/libeufin/nexus/ebics/Ebics2.kt
+++ b/nexus/src/main/kotlin/tech/libeufin/nexus/ebics/Ebics2.kt
@@ -25,6 +25,8 @@ package tech.libeufin.nexus.ebics
 
 import io.ktor.client.*
 import org.bouncycastle.util.encoders.UTF8
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
 import tech.libeufin.nexus.BankPublicKeysFile
 import tech.libeufin.nexus.ClientPrivateKeysFile
 import tech.libeufin.nexus.EbicsSetupConfig
@@ -37,6 +39,8 @@ import java.time.ZoneId
 import java.util.*
 import javax.xml.datatype.DatatypeFactory
 
+private val logger: Logger = 
LoggerFactory.getLogger("tech.libeufin.nexus.Ebics2")
+
 /**
  * Convenience function to download via EBICS with a
  * customer message type.
diff --git a/nexus/src/main/kotlin/tech/libeufin/nexus/ebics/EbicsCommon.kt 
b/nexus/src/main/kotlin/tech/libeufin/nexus/ebics/EbicsCommon.kt
index f539977c..cb0e6a63 100644
--- a/nexus/src/main/kotlin/tech/libeufin/nexus/ebics/EbicsCommon.kt
+++ b/nexus/src/main/kotlin/tech/libeufin/nexus/ebics/EbicsCommon.kt
@@ -44,18 +44,20 @@ import io.ktor.client.statement.*
 import io.ktor.http.*
 import org.apache.commons.compress.archivers.zip.ZipFile
 import org.apache.commons.compress.utils.SeekableInMemoryByteChannel
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
 import tech.libeufin.nexus.*
 import tech.libeufin.util.*
 import tech.libeufin.util.ebics_h005.Ebics3Request
-import tech.libeufin.util.logger
 import java.io.ByteArrayOutputStream
 import java.security.interfaces.RSAPrivateCrtKey
-import java.time.Instant
 import java.time.LocalDateTime
 import java.time.format.DateTimeFormatter
 import java.util.*
 import java.util.zip.DeflaterInputStream
 
+private val logger: Logger = 
LoggerFactory.getLogger("tech.libeufin.nexus.EbicsCommon")
+
 /**
  * Available EBICS versions.
  */
diff --git a/util/build.gradle b/util/build.gradle
index 09c7fa45..dfb5967d 100644
--- a/util/build.gradle
+++ b/util/build.gradle
@@ -35,5 +35,6 @@ dependencies {
     implementation("io.ktor:ktor-serialization-kotlinx-json:$ktor_version")
 
     implementation("org.jetbrains.kotlin:kotlin-test:$kotlin_version")
-    
+
+    implementation("com.github.ajalt.clikt:clikt:4.2.1")
 }
\ No newline at end of file
diff --git a/util/src/main/kotlin/Config.kt b/util/src/main/kotlin/Config.kt
index afe695ce..065dc96f 100644
--- a/util/src/main/kotlin/Config.kt
+++ b/util/src/main/kotlin/Config.kt
@@ -1,10 +1,7 @@
 package tech.libeufin.util
 
 import ch.qos.logback.core.util.Loader
-import org.slf4j.Logger
-import org.slf4j.LoggerFactory
 
-val logger: Logger = LoggerFactory.getLogger("tech.libeufin.util")
 /**
  * Putting those values into the 'attributes' container because they
  * are needed by the util routines that do NOT have Sandbox and Nexus
diff --git a/util/src/main/kotlin/ConfigCli.kt 
b/util/src/main/kotlin/ConfigCli.kt
new file mode 100644
index 00000000..3d484f50
--- /dev/null
+++ b/util/src/main/kotlin/ConfigCli.kt
@@ -0,0 +1,119 @@
+/*
+ * This file is part of LibEuFin.
+ * Copyright (C) 2023 Taler Systems S.A.
+
+ * LibEuFin is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation; either version 3, or
+ * (at your option) any later version.
+
+ * LibEuFin is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General
+ * Public License for more details.
+
+ * You should have received a copy of the GNU Affero General Public
+ * License along with LibEuFin; see the file COPYING.  If not, see
+ * <http://www.gnu.org/licenses/>
+ */
+
+package tech.libeufin.util
+
+import ConfigSource
+import TalerConfig
+import TalerConfigError
+import com.github.ajalt.clikt.core.CliktCommand
+import com.github.ajalt.clikt.core.subcommands
+import com.github.ajalt.clikt.parameters.arguments.argument
+import com.github.ajalt.clikt.parameters.options.flag
+import com.github.ajalt.clikt.parameters.options.option
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
+import kotlin.system.exitProcess
+
+private val logger: Logger = 
LoggerFactory.getLogger("tech.libeufin.util.ConfigCli")
+
+private fun <R> catchError(lambda: () -> R): R {
+    try {
+        return lambda()
+    } catch (e: TalerConfigError) {
+        logger.error(e.message)
+        exitProcess(1)
+    }
+}
+
+private fun talerConfig(configSource: ConfigSource, configPath: String?): 
TalerConfig = catchError {
+    val config = TalerConfig(configSource)
+    config.load(configPath)
+    config
+}
+
+class CliConfigCmd(configSource: ConfigSource) : CliktCommand("Dump the 
configuration", name = "config") {
+    init {
+        subcommands(CliConfigDump(configSource), 
CliConfigPathsub(configSource), CliConfigGet(configSource))
+    }
+
+    override fun run() = Unit
+}
+
+private class CliConfigGet(private val configSource: ConfigSource) : 
CliktCommand("Lookup config value", name = "get") {
+    private val configFile by option(
+        "--config", "-c",
+        help = "set the configuration file"
+    )
+    private val isPath by option(
+        "--filename", "-f",
+        help = "interpret value as path with dollar-expansion"
+    ).flag()
+    private val sectionName by argument()
+    private val optionName by argument()
+
+
+    override fun run() {
+        val config = talerConfig(configSource, configFile)
+        if (isPath) {
+            val res = config.lookupPath(sectionName, optionName)
+            if (res == null) {
+                logger.error("value not found in config")
+                exitProcess(2)
+            }
+            println(res)
+        } else {
+            val res = config.lookupString(sectionName, optionName)
+            if (res == null) {
+                logger.error("value not found in config")
+                exitProcess(2)
+            }
+            println(res)
+        }
+    }
+}
+
+
+
+private class CliConfigPathsub(private val configSource: ConfigSource) : 
CliktCommand("Substitute variables in a path", name = "pathsub") {
+    private val configFile by option(
+        "--config", "-c",
+        help = "set the configuration file"
+    )
+    private val pathExpr by argument()
+
+    override fun run() {
+        val config = talerConfig(configSource, configFile)
+        println(config.pathsub(pathExpr))
+    }
+}
+
+private class CliConfigDump(private val configSource: ConfigSource) : 
CliktCommand("Dump the configuration", name = "dump") {
+    private val configFile by option(
+        "--config", "-c",
+        help = "set the configuration file"
+    )
+
+    override fun run() {
+        val config = talerConfig(configSource, configFile)
+        println("# install path: ${config.getInstallPath()}")
+        config.load(this.configFile)
+        println(config.stringify())
+    }
+}
diff --git a/util/src/main/kotlin/DB.kt b/util/src/main/kotlin/DB.kt
index baaeb450..02591ad2 100644
--- a/util/src/main/kotlin/DB.kt
+++ b/util/src/main/kotlin/DB.kt
@@ -36,6 +36,7 @@ import java.sql.SQLException
 
 fun getCurrentUser(): String = System.getProperty("user.name")
 
+private val logger: Logger = LoggerFactory.getLogger("tech.libeufin.util.DB")
 
 // Check GANA (https://docs.gnunet.org/gana/index.html) for numbers allowance.
 
diff --git a/util/src/main/kotlin/HTTP.kt b/util/src/main/kotlin/HTTP.kt
index d310c9ba..20ec3817 100644
--- a/util/src/main/kotlin/HTTP.kt
+++ b/util/src/main/kotlin/HTTP.kt
@@ -4,6 +4,10 @@ import io.ktor.http.*
 import io.ktor.server.application.*
 import io.ktor.server.request.*
 import io.ktor.server.util.*
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
+
+private val logger: Logger = LoggerFactory.getLogger("tech.libeufin.util.HTTP")
 
 // Get the base URL of a request, returns null if any problem occurs.
 fun ApplicationRequest.getBaseUrl(): String? {
diff --git a/util/src/main/kotlin/IbanPayto.kt 
b/util/src/main/kotlin/IbanPayto.kt
index 07d331c9..8920aed9 100644
--- a/util/src/main/kotlin/IbanPayto.kt
+++ b/util/src/main/kotlin/IbanPayto.kt
@@ -1,8 +1,12 @@
 package tech.libeufin.util
 
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
 import java.net.URI
 import java.net.URLDecoder
 
+private val logger: Logger = 
LoggerFactory.getLogger("tech.libeufin.util.IbanPayto")
+
 // Payto information.
 data class IbanPayto(
     // represent query param "sender-name" or "receiver-name".
diff --git a/util/src/main/kotlin/TalerConfig.kt 
b/util/src/main/kotlin/TalerConfig.kt
index d468eaa0..acbdefc7 100644
--- a/util/src/main/kotlin/TalerConfig.kt
+++ b/util/src/main/kotlin/TalerConfig.kt
@@ -17,13 +17,16 @@
  * <http://www.gnu.org/licenses/>
  */
 
-import tech.libeufin.util.logger
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
 import java.io.File
 import java.nio.file.Paths
 import kotlin.io.path.Path
 import kotlin.io.path.isReadable
 import kotlin.io.path.listDirectoryEntries
 
+private val logger: Logger = 
LoggerFactory.getLogger("tech.libeufin.util.TalerConfig")
+
 private data class Section(
     val entries: MutableMap<String, String>,
 )
diff --git a/util/src/main/kotlin/UnixDomainSocket.kt 
b/util/src/main/kotlin/UnixDomainSocket.kt
index 5207081c..01e825d3 100644
--- a/util/src/main/kotlin/UnixDomainSocket.kt
+++ b/util/src/main/kotlin/UnixDomainSocket.kt
@@ -2,12 +2,9 @@ import io.ktor.client.plugins.*
 import io.ktor.client.request.*
 import io.ktor.server.application.*
 import io.ktor.client.statement.*
-import io.ktor.http.*
 import io.ktor.http.HttpHeaders
 import io.ktor.http.HttpMethod
-import io.ktor.server.engine.*
 import io.ktor.server.testing.*
-import io.ktor.utils.io.pool.*
 import io.netty.bootstrap.ServerBootstrap
 import io.netty.buffer.ByteBufInputStream
 import io.netty.buffer.Unpooled
@@ -20,9 +17,12 @@ import io.netty.handler.codec.http.DefaultHttpResponse
 import io.netty.handler.logging.LoggingHandler
 import io.netty.handler.stream.ChunkedStream
 import io.netty.handler.stream.ChunkedWriteHandler
-import tech.libeufin.util.logger
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
 import java.io.ByteArrayInputStream
 
+private val logger: Logger = 
LoggerFactory.getLogger("tech.libeufin.util.UnixDomainSocket")
+
 fun startServer(
     unixSocketPath: String,
     app: Application.() -> Unit
diff --git a/util/src/main/kotlin/XMLUtil.kt b/util/src/main/kotlin/XMLUtil.kt
index 85e1ce14..67ab77dc 100644
--- a/util/src/main/kotlin/XMLUtil.kt
+++ b/util/src/main/kotlin/XMLUtil.kt
@@ -21,6 +21,8 @@ package tech.libeufin.util
 
 import com.sun.xml.bind.marshaller.NamespacePrefixMapper
 import io.ktor.http.*
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
 import org.w3c.dom.Document
 import org.w3c.dom.Node
 import org.w3c.dom.NodeList
@@ -60,6 +62,8 @@ import javax.xml.xpath.XPath
 import javax.xml.xpath.XPathConstants
 import javax.xml.xpath.XPathFactory
 
+private val logger: Logger = 
LoggerFactory.getLogger("tech.libeufin.util.XMLUtil")
+
 class DefaultNamespaces : NamespacePrefixMapper() {
     override fun getPreferredPrefix(namespaceUri: String?, suggestion: 
String?, requirePrefix: Boolean): String? {
         if (namespaceUri == "http://www.w3.org/2000/09/xmldsig#";) return "ds"
diff --git a/util/src/main/kotlin/startServer.kt 
b/util/src/main/kotlin/startServer.kt
index 06b1ee03..de6923a9 100644
--- a/util/src/main/kotlin/startServer.kt
+++ b/util/src/main/kotlin/startServer.kt
@@ -4,8 +4,12 @@ import io.ktor.server.application.*
 import io.ktor.server.engine.*
 import io.ktor.server.netty.*
 import io.netty.channel.unix.Errors
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
 import kotlin.system.exitProcess
 
+private val logger: Logger = 
LoggerFactory.getLogger("tech.libeufin.util.startServer")
+
 const val EAFNOSUPPORT = -97 // Netty defines errors negatively.
 class StartServerOptions(
     var ipv4OnlyOpt: Boolean,
diff --git a/util/src/main/kotlin/time.kt b/util/src/main/kotlin/time.kt
index b164b0d0..25f5265f 100644
--- a/util/src/main/kotlin/time.kt
+++ b/util/src/main/kotlin/time.kt
@@ -19,10 +19,14 @@
 
 package tech.libeufin.util
 
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
 import java.time.*
 import java.time.format.DateTimeFormatter
 import java.time.temporal.ChronoUnit
 
+private val logger: Logger = LoggerFactory.getLogger("tech.libeufin.util.time")
+
 /**
  * Converts the 'this' Instant to the number of nanoseconds
  * since the Epoch.  It returns the result as Long, or null

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