Added readme, improved queries

Readme.md

+# KStats
+
+## Setup
+
+1. Create a PostgreSQL user and database for the statsbot
+2. Apply the schema (see `schema.sql` to the database)
+3. Add channels to the channels table
+4. Start the bot
+
+## Configuration
+
+The bot takes several environment variables for configuration.  
+Required variables are marked with *
+
+| Name                     | Example                                        | Description                                            |
+| ------------------------ | ---------------------------------------------- | ------------------------------------------------------ |
+|`KSTATS_IRC_SERVER`*      | `irc.rizon.net`                                | Irc Servername                                         |
+|`KSTATS_IRC_PORT`*        | `6697`                                         | Irc Port                                               |
+|`KSTATS_IRC_SECURE`       | `true`                                         | If TLS should be enabled for this connection           |
+|`KSTATS_IRC_NICK`         |`kstats`                                        | Nickname visible on IRC                                |
+|`KSTATS_IRC_IDENT`        |`kstats`                                        | Ident visible on IRC                                   |
+|`KSTATS_IRC_REALNAME`     |`KStats kuschku.de Statistics Bot`              | Realname visible on IRC                                |
+|`KSTATS_IRC_SASL_ENABLED` |`true`                                          | If SASL is enabled                                     |
+|`KSTATS_IRC_SASL_ACCOUNT` |`kstats`                                        | SASL Username                                          |
+|`KSTATS_IRC_SASL_PASSWORD`|`caa5db269fc39`                                 | SASL Password                                          |
+|`KSTATS_DATABASE_TYPE`*   |`postgres`                                      | Database driver (only postgres is supported currently) |
+|`KSTATS_DATABASE_URL`*    |`postgresql://kstats:hunter2@localhost/statsbot`| Database URL                                           |

main.go

@@ -212,9 +212,8 @@ func handlePrivateMessage(channels map[string]IrcChannel, event girc.Event, clie
 			if len(parameters) == 1 {
 				channelName := parameters[0]
 				if channelData, ok := channels[channelName]; ok {
-					nick := event.Source.Name
-					hash := hashName(channelData.Salt, nick)
-					_, err := db.Exec("DELETE FROM users WHERE hash = $1 AND nick = $2", hash, nick)
+					hash := hashName(channelData.Salt, event.Source.Name)
+					_, err := db.Exec("DELETE FROM users WHERE hash = $1", hash)
 					if err != nil {
 						client.Cmd.Reply(event, "An error has occured, please try later again")
 						println(err.Error())
@@ -260,7 +259,7 @@ func logMessage(channelData IrcChannel, event girc.Event, client *girc.Client, c
 		}
 	}
 	for _, user := range users {
-		_, err := db.Exec("INSERT INTO \"references\" (time, source, target) VALUES ($1, $2, $3)", now, name, user)
+		_, err := db.Exec("INSERT INTO \"references\" (channel, time, source, target) VALUES ($1, $2, $3, $4)", channelData.Id, now, name, user)
 		if err != nil {
 			println(err.Error())
 		}

schema.sql

+create table messages (
+  id          serial not null
+    constraint messages_pkey primary key,
+  time        timestamp,
+  channel     integer
+    constraint messages_channels_id_fk references channels on update cascade on delete cascade,
+  sender      text,
+  words       integer,
+  characters  integer,
+  question    boolean,
+  exclamation boolean,
+  caps        boolean,
+  aggression  boolean,
+  emoji_happy boolean,
+  emoji_sad   boolean
+);
+
+create index messages_channel_index
+  on messages (channel);
+create index messages_channel_sender_index
+  on messages (channel, sender);
+
+create table users (
+  hash text not null
+    constraint users_pkey primary key,
+  nick text
+);
+
+create table "references" (
+  id      serial not null
+    constraint references_pkey primary key,
+  channel integer
+    constraint references_channels_id_fk references channels on update cascade on delete cascade,
+  time    timestamp,
+  source  text,
+  target  text
+);
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