add findIpForHostname

src/main/kotlin/org/domaindrivenarchitecture/provs/framework/ubuntu/web/base/Web.kt

@@ -2,11 +2,15 @@ package org.domaindrivenarchitecture.provs.framework.ubuntu.web.base
 
 import org.domaindrivenarchitecture.provs.framework.core.Prov
 import org.domaindrivenarchitecture.provs.framework.core.ProvResult
+import org.domaindrivenarchitecture.provs.framework.ubuntu.filesystem.base.checkFile
 import org.domaindrivenarchitecture.provs.framework.ubuntu.filesystem.base.createDirs
 import org.domaindrivenarchitecture.provs.framework.ubuntu.filesystem.base.deleteFile
-import org.domaindrivenarchitecture.provs.framework.ubuntu.filesystem.base.checkFile
 import org.domaindrivenarchitecture.provs.framework.ubuntu.filesystem.base.normalizePath
 import org.domaindrivenarchitecture.provs.framework.ubuntu.install.base.aptInstall
+import java.net.Inet4Address
+import java.net.Inet6Address
+import java.net.InetAddress
+import java.net.UnknownHostException
 
 
 /**
@@ -53,4 +57,27 @@ fun Prov.downloadFromURL(
     } else {
         ProvResult(true, out = "No sha256sum check requested.")
     }
-}
+}
+
+
+/**
+ * Returns the ip for the given hostname if found else null
+ */
+fun Prov.findIpForHostname(hostname: String): String? {
+    val ipText = cmd("dig +short $hostname").out?.trim()
+
+    // check if ipText is valid
+    return try {
+        val ip: Any = InetAddress.getByName(ipText ?: "")
+        return if (ip is Inet4Address || ip is Inet6Address) ipText else null
+    } catch (exception: UnknownHostException) {
+        null
+    }
+}
+
+/**
+ * Returns the ip for the given hostname if found else throws a RuntimeExeption
+ */
+fun Prov.getIpForHostname(hostname: String): String {
+    return findIpForHostname(hostname) ?: throw RuntimeException("Could not resolve ip for: $hostname")
+}

src/test/kotlin/org/domaindrivenarchitecture/provs/framework/ubuntu/web/base/WebKtTest.kt

@@ -1,8 +1,9 @@
 package org.domaindrivenarchitecture.provs.framework.ubuntu.web.base
 
+import org.domaindrivenarchitecture.provs.framework.ubuntu.filesystem.base.checkFile
 import org.domaindrivenarchitecture.provs.framework.ubuntu.filesystem.base.createFile
 import org.domaindrivenarchitecture.provs.framework.ubuntu.filesystem.base.fileContent
-import org.domaindrivenarchitecture.provs.framework.ubuntu.filesystem.base.checkFile
+import org.domaindrivenarchitecture.provs.framework.ubuntu.install.base.aptInstall
 import org.domaindrivenarchitecture.provs.test.defaultTestContainer
 import org.domaindrivenarchitecture.provs.test.tags.ContainerTest
 import org.junit.jupiter.api.Assertions.*
@@ -56,18 +57,59 @@ internal class WebKtTest {
     @Test
     fun downloadFromURL_local_file_with_incorrect_checksum() {
         // given
-        val a = defaultTestContainer()
+        val prov = defaultTestContainer()
         val srcFile = "file3.txt"
         val targetFile = "file3b.txt"
-        a.createFile("/tmp/" + srcFile, "hello")
+        prov.createFile("/tmp/" + srcFile, "hello")
 
         // when
-        val res = a.downloadFromURL("file:///tmp/" + srcFile, targetFile, "tmp", sha256sum = "2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824WRONG", overwrite = true)
+        val res = prov.downloadFromURL("file:///tmp/" + srcFile, targetFile, "tmp", sha256sum = "2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824WRONG", overwrite = true)
 
         // then
-        val res2 = a.checkFile("tmp/$targetFile")
+        val res2 = prov.checkFile("tmp/$targetFile")
 
         assertFalse(res.success)
         assertFalse(res2)
     }
+
+    @ContainerTest
+    fun findIpForHostname_finds_ip() {
+        // given
+        val prov = defaultTestContainer()
+        prov.aptInstall("dnsutils")
+
+        // when
+        val ip = prov.findIpForHostname("localhost")
+
+        // then
+        assertEquals("127.0.0.1", ip)
+    }
+
+    @ContainerTest
+    fun findIpForHostname_returns_null_if_ip_not_found() {
+        // given
+        val prov = defaultTestContainer()
+        prov.aptInstall("dnsutils")
+
+        // when
+        val ip = prov.findIpForHostname("hostwhichisnotexisting")
+
+        // then
+        assertEquals(null, ip)
+    }
+
+    @Test
+    fun getIpForHostname_throws_exception_if_ip_not_found() {
+        // given
+        val prov = defaultTestContainer()
+        prov.aptInstall("dnsutils")
+
+        val exception = org.junit.jupiter.api.assertThrows<RuntimeException> {
+            // when
+            prov.getIpForHostname("hostwhichisnotexisting")
+        }
+
+        // then
+        assertEquals("Could not resolve ip for: hostwhichisnotexisting", exception.message)
+    }
 }