fix(bigtable): rely on metadata from afes for connectivity error

Author: sushanb

google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/data/v2/internal/dp/DirectAccessInvestigator.java

@@ -0,0 +1,4 @@
+package com.google.cloud.bigtable.data.v2.internal.dp;
+
+public class DirectAccessInvestigator {
+}

google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/data/v2/internal/dp/GCECheck.java

@@ -0,0 +1,38 @@
+package com.google.cloud.bigtable.data.v2.internal.dp;
+
+import com.google.common.annotations.VisibleForTesting;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+
+class GCECheck {
+    private static final String GCE_PRODUCTION_NAME_PRIOR_2016 = "Google";
+    private static final String GCE_PRODUCTION_NAME_AFTER_2016 = "Google Compute Engine";
+
+    @VisibleForTesting
+    static String systemProductName = null;
+
+    static boolean isRunningOnGCP() {
+        String osName = System.getProperty("os.name");
+        if ("Linux".equals(osName)) {
+            String productName = getSystemProductName();
+            return productName.contains(GCE_PRODUCTION_NAME_PRIOR_2016)
+                    || productName.contains(GCE_PRODUCTION_NAME_AFTER_2016);
+        }
+        return false;
+    }
+
+    private static String getSystemProductName() {
+        if (systemProductName != null) {
+            return systemProductName;
+        }
+        try {
+            return new String(
+                    Files.readAllBytes(Paths.get("/sys/class/dmi/id/product_name")),
+                    StandardCharsets.UTF_8).trim();
+        } catch (IOException e) {
+            return "";
+        }
+    }
+}

google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/data/v2/internal/dp/LoopBackInterface.java

@@ -0,0 +1,4 @@
+package com.google.cloud.bigtable.data.v2.internal.dp;
+
+public class LoopbackInterface {
+}

google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/data/v2/internal/dp/MetadataServer.java

@@ -0,0 +1,4 @@
+package com.google.cloud.bigtable.data.v2.internal.dp;
+
+public class MetadataServer {
+}