WIP: initial pure js impl for IBM i AIX variant (#11)

* initial pure js impl for IBM i AIX variant

* Fix style errors

* minor bugfix with unassigned const

* fix style errors #2

* remove silly plus sign

Author: ThePrez

aix.js

@@ -0,0 +1,40 @@
+"use strict";
+
+const execa = require("execa");
+
+const sql = "select NEXT_HOP, LOCAL_BINDING_INTERFACE from QSYS2.NETSTAT_ROUTE_INFO where ROUTE_TYPE='DFTROUTE' and NEXT_HOP!='*DIRECT' and CONNECTION_TYPE=?";
+
+const checkVariant = () => {if (require("os").type() !== "OS400") throw new Error("Unsupported AIX variant"); };
+
+const parse = stdout => {
+  let result;
+  try {
+    const resultObj = JSON.parse(stdout);
+    const gateway = resultObj.records[0].NEXT_HOP;
+    const iface = resultObj.records[0].LOCAL_BINDING_INTERFACE;
+    result = {gateway, iface};
+  } catch {}
+  if (!result) {
+    throw new Error("Unable to determine default gateway");
+  }
+  return result;
+};
+
+const promise = family => {
+  checkVariant();
+  return execa.stdout("/QOpenSys/pkgs/bin/db2util", [sql, "-p", family, "-o", "json"]).then(stdout => {
+    return parse(stdout);
+  });
+};
+
+const sync = family => {
+  checkVariant();
+  const result = execa.sync("/QOpenSys/pkgs/bin/db2util", [sql, "-p", family, "-o", "json"]);
+  return parse(result.stdout);
+};
+
+module.exports.v4 = () => promise("IPV4");
+module.exports.v6 = () => promise("IPV6");
+
+module.exports.v4.sync = () => sync("IPV4");
+module.exports.v6.sync = () => sync("IPV6");

index.js

@@ -10,6 +10,7 @@ if ([
   "openbsd",
   "sunos",
   "win32",
+  "aix",
 ].indexOf(platform) !== -1) {
   const families = require(`./${platform}`);
   module.exports.v4 = () => families.v4();