Adding blocked_hosts table, ensure only new hosts are inserted.

lib/db.js

@@ -39,7 +39,29 @@ exports.initializeDatabase = function() {
                 if (err !== null)
                     throw err
                 
-                console.log(JSON.parse(data))
+                // console.log(JSON.parse(data))
+                let blockedData = JSON.parse(data)
+                db.run("create table if not exists blocked_hosts (hostname TEXT)", (err, row) => {
+                    if (err !== null) {
+                        logErrorAndExit("Error creating table blocked_hosts: " + err)
+                    }
+                })
+
+                db.get("select count(*) from blocked_hosts", (err, row) => {
+                    if (err !== null) {
+                        logErrorAndExit("Error getting count of blocked_hosts")
+                    }
+                    // if (blockedData.hosts.length  row['count(*)'])
+                    for (let host of blockedData.hosts) {
+                        db.get("select hostname from blocked_hosts where hostname = ?", [host], (err, row) => {
+                            if (err !== null) {
+                                db.run("insert into blocked_hosts (hostname) values (?)", [hostname]);
+                            }
+                            // TODO -- run a diff for whatever has been deleted from the config file. 
+                        })
+                    }
+                })
+
             })
         } catch(err) {
             console.log(err)