implemented cleanup/update of DNS records on config change

lib/ddns/dns-ctrl.js

@@ -23,7 +23,7 @@ module.exports.create = function (deps, conf) {
       var tldObj = {};
       resp.data.forEach(function (tldInfo) {
         if (tldInfo.enabled) {
-          tldObj[tldInfo.com] = true;
+          tldObj[tldInfo.tld] = true;
         }
       });
 
@@ -60,8 +60,8 @@ module.exports.create = function (deps, conf) {
       // rare even if the assumption isn't valid.
       return {
         tld: split.slice(-tldSegCnt).join('.')
-      , sld: split.slice(-tldSegCnt-1, 1)
+      , sld: split.slice(-tldSegCnt-1, -tldSegCnt).join('.')
-      , sub: split.slice(0, -tldSegCnt-1)
+      , sub: split.slice(0, -tldSegCnt-1).join('.')
       };
     });
   }
@@ -152,8 +152,23 @@ module.exports.create = function (deps, conf) {
     return (dev || {}).addresses || [];
   }
 
+  async function removeDomains(session, domains) {
+    var directives = await deps.OAUTH3.discover(session.token.aud);
+
+    var oldDns = await splitDomains(directives.api, domains);
+    var common = {
+      api: 'devices.detach'
+    , session: session
+    , device: conf.device.hostname
+    };
+    await deps.PromiseA.all(oldDns.map(function (record) {
+      return deps.OAUTH3.api(directives.api, Object.assign({}, common, record));
+    }));
+  }
+
   return {
-    getDeviceAddresses: getDeviceAddresses
+    getDeviceAddresses
-  , setDeviceAddress:   setDeviceAddress
+  , setDeviceAddress
+  , removeDomains
   };
 };

lib/ddns/index.js

@@ -8,12 +8,13 @@ module.exports.create = function (deps, conf) {
 
   var loopbackDomain;
 
-  function iterateAllModules(action) {
+  function iterateAllModules(action, curConf) {
-    var promises = conf.ddns.modules.map(function (mod) {
+    curConf = curConf || conf;
+    var promises = curConf.ddns.modules.map(function (mod) {
       return action(mod, mod.domains);
     });
 
-    conf.domains.forEach(function (dom) {
+    curConf.domains.forEach(function (dom) {
       if (!dom.modules || !Array.isArray(dom.modules.ddns) || !dom.modules.ddns.length) {
         return null;
       }
@@ -168,6 +169,87 @@ module.exports.create = function (deps, conf) {
     });
   }
 
+  function getModuleDiffs(prevConf) {
+    var prevMods = {};
+    var curMods = {};
+
+    // this returns a Promise, but since the functions we use are synchronous
+    // and change our enclosed variables we don't need to wait for the return.
+    iterateAllModules(function (mod, domainList) {
+      if (mod.type !== 'dns@oauth3.org') { return; }
+
+      prevMods[mod.id] = { mod, domainList };
+      return true;
+    }, prevConf);
+    iterateAllModules(function (mod, domainList) {
+      if (mod.type !== 'dns@oauth3.org') { return; }
+
+      curMods[mod.id] = { mod, domainList };
+      return true;
+    });
+
+    // Filter out all of the modules that are exactly the same including domainList
+    // since there is no required action to transition.
+    Object.keys(prevMods).map(function (id) {
+      if (equal(prevMods[id], curMods[id])) {
+        delete prevMods[id];
+        delete curMods[id];
+      }
+    });
+
+    return {prevMods, curMods};
+  }
+  async function cleanOldDns(prevConf) {
+    var {prevMods, curMods} = getModuleDiffs(prevConf);
+
+    // Then remove DNS records for the domains that we are no longer responsible for.
+    await Promise.all(Object.values(prevMods).map(function ({mod, domainList}) {
+      var oldDomains;
+      if (!curMods[mod.id] || mod.tokenId !== curMods[mod.id].mod.tokenId) {
+        oldDomains = domainList.slice();
+      } else {
+        oldDomains = domainList.filter(function (domain) {
+          return curMods[mod.id].domainList.indexOf(domain) < 0;
+        });
+      }
+      if (conf.debug) {
+        console.log('removing old domains for module', mod.id, oldDomains.join(', '));
+      }
+      if (!oldDomains.length) {
+        return;
+      }
+
+      return getSession(mod.tokenId).then(function (session) {
+        return dnsCtrl.removeDomains(session, oldDomains);
+      });
+    }).filter(Boolean));
+  }
+  async function setNewDns(prevConf) {
+    var {prevMods, curMods} = getModuleDiffs(prevConf);
+
+    // And add DNS records for any newly added domains.
+    await Promise.all(Object.values(curMods).map(function ({mod, domainList}) {
+      var newDomains;
+      if (!prevMods[mod.id] || mod.tokenId !== prevMods[mod.id].mod.tokenId) {
+        newDomains = domainList.slice();
+      } else {
+        newDomains = domainList.filter(function (domain) {
+          return prevMods[mod.id].domainList.indexOf(domain) < 0;
+        });
+      }
+      if (conf.debug) {
+        console.log('adding new domains for module', mod.id, newDomains.join(', '));
+      }
+      if (!newDomains.length) {
+        return;
+      }
+
+      return getSession(mod.tokenId).then(function (session) {
+        return dnsCtrl.setDeviceAddress(session, publicAddress, newDomains);
+      });
+    }).filter(Boolean));
+  }
+
   recheckPubAddr();
   setInterval(recheckPubAddr, 5*60*1000);
 
@@ -189,17 +271,30 @@ module.exports.create = function (deps, conf) {
       }
     }
 
-    if (tunnelActive) {
+    if (!curConf) {
-      if (!curConf || !equal(curConf.ddns.tunnel, conf.ddns.tunnel)) {
-        disconnectTunnel().then(connectTunnel);
-      } else {
-        checkTunnelTokens();
-      }
-    }
-
       // We need to make a deep copy of the config so we can use it next time to
       // compare and see what setup/cleanup is needed to adapt to the changes.
       curConf = JSON.parse(JSON.stringify(conf));
+      return;
+    }
+
+    cleanOldDns(curConf).then(function () {
+      if (!tunnelActive) {
+        return setNewDns(curConf);
+      }
+      if (equal(curConf.ddns.tunnel, conf.ddns.tunnel)) {
+        return checkTunnelTokens();
+      } else {
+        return disconnectTunnel().then(connectTunnel);
+      }
+    }).catch(function (err) {
+      console.error('error transitioning DNS between configurations');
+      console.error(err);
+    }).then(function () {
+      // We need to make a deep copy of the config so we can use it next time to
+      // compare and see what setup/cleanup is needed to adapt to the changes.
+      curConf = JSON.parse(JSON.stringify(conf));
+    });
   }
   updateConf();