user: Add mysql user db implementation.

politeiad/backendv2/tstorebe/store/mysql/mysql.go

@@ -14,6 +14,7 @@ import (
 	"github.com/decred/politeia/politeiad/backendv2/tstorebe/store"
 	"github.com/decred/politeia/util"
 
+	// MySQL driver.
 	_ "github.com/go-sql-driver/mysql"
 )
 
@@ -278,7 +279,9 @@ func (s *mysql) Close() {
 	s.db.Close()
 }
 
-func New(appDir, host, user, password, dbname string) (*mysql, error) {
+// New connects to a mysql instance using the given connection params,
+// and returns pointer to the created mysql struct.
+func New(host, user, password, dbname string) (*mysql, error) {
 	// The password is required to derive the encryption key
 	if password == "" {
 		return nil, fmt.Errorf("password not provided")

politeiad/backendv2/tstorebe/tstore/tstore.go

@@ -27,7 +27,7 @@ const (
 	// store to a leveldb instance.
 	DBTypeLevelDB = "leveldb"
 
-	// DBTypeLevelDB is a config option that sets the backing key-value
+	// DBTypeMySQL is a config option that sets the backing key-value
 	// store to a MySQL instance.
 	DBTypeMySQL = "mysql"
 
@@ -227,7 +227,7 @@ func New(appDir, dataDir string, anp *chaincfg.Params, tlogHost, tlogPass, dbTyp
 	case DBTypeMySQL:
 		// Example db name: testnet3_unvetted_kv
 		dbName := fmt.Sprintf("%v_kv", anp.Name)
-		kvstore, err = mysql.New(appDir, dbHost, dbUser, dbPass, dbName)
+		kvstore, err = mysql.New(dbHost, dbUser, dbPass, dbName)
 		if err != nil {
 			return nil, err
 		}

politeiawww/README.md

@@ -51,6 +51,41 @@ can be skipped if you already completed it while setting up politeiad.
     $ go install -v ./...
     ```
 
+### Setup MySQL (optional)
+
+This repo includes a script to setup a MySQL user database, it creates the 
+needed databases, the politeiawww user and assigns user privileges. Password 
+authentication is used for all database connections.
+
+**Note:** This is an optional step. By default, politeiawww will use a LevelDB 
+instance that does not require any additional setup.
+
+The setup script assumes MySQL is running on localhost:3306 and the users will 
+be accessing the databse from localhost. See the setup script comments for more 
+complex setups.
+
+Run the following commands. You will need to replace rootpass with the existing 
+password of your root user. The politeiawwwpass is the password that will be 
+set for the politeiawww user when it's created.
+
+```
+$ cd $GOPATH/src/github.com/decred/politeia/scripts/userdb
+$ env \
+  MYSQL_ROOT_PASSWORD=rootpass \
+  MYSQL_POLITEIAWWW_PASSWORD=politeiawwwpass \
+  ./mysqlsetup.sh
+```
+
+You will need to use the `--userdb=mysql` flag when starting politeiawww or 
+add `userdb=mysql` to the `politeiawww.config` file that is setup in the steps
+below.
+
+Also, an encryption key is required when using a MySQL database, use
+`politeiawww_dbutil` cmd tool to create one: 
+```
+politeiawww_dbutil -createkey 
+```
+
 ### Setup and run politeiawww
 
 [politeiad](https://github.com/decred/politeia/tree/master/politeiad#politeiad)

politeiawww/cmd/politeiawww_dbutil/README.md

@@ -17,14 +17,16 @@ You can specify the following options:
             Use LevelDB
       -cockroachdb
             Use CockroachDB
+      -mysql
+            Use MySQL
 
     Application options
       -testnet
             Use testnet database
       -datadir string
             politeiawww data directory
             (default osDataDir/politeiawww/data)
-      -host string
+      -cockroachdbhost string
             CockroachDB ip:port 
             (default localhost:26257)
       -rootcert string
@@ -37,54 +39,59 @@ You can specify the following options:
             File containing the CockroachDB SSL client cert key
             (default ~/.cockroachdb/certs/clients/politeiawww/client.politeiawww.key)
       -encryptionkey string
-            File containing the CockroachDB encryption key
+            File containing the CockroachDB/MySQL encryption key
             (default osDataDir/politeiawww/sbox.key)
+      -password string
+            MySQL database password.
+      -mysqlhost string
+            MySQL ip:port 
+            (default localhost:3306)
 
     Commands
       -addcredits
             Add proposal credits to a user's account
-            Required DB flag : -leveldb or -cockroachdb
+            Required DB flag : -leveldb, -cockroachdb or -mysql
             LevelDB args     : <email> <quantity>
             CockroachDB args : <username> <quantity>
       -setadmin
             Set the admin flag for a user
-            Required DB flag : -leveldb or -cockroachdb
+            Required DB flag : -leveldb, -cockroachdb or -mysql
             LevelDB args     : <email> <true/false>
             CockroachDB args : <username> <true/false>
       -setemail
             Set a user's email to the provided email address
-            Required DB flag : -cockroachdb
+            Required DB flag : -cockroachdb or -mysql
             CockroachDB args : <username> <email>
       -stubusers
             Create user stubs for the public keys in a politeia repo
-            Required DB flag : -leveldb or -cockroachdb
+            Required DB flag : -leveldb, -cockroachdb or -mysql
             LevelDB args     : <importDir>
             CockroachDB args : <importDir>
       -dump
             Dump the entire database or the contents of a specific user
             Required DB flag : -leveldb
-            LevelDB args     : <email>
+            LevelDB args     : <username>
       -createkey
             Create a new encryption key that can be used to encrypt data at rest
             Required DB flag : None
             Args             : <destination (optional)>
                                (default osDataDir/politeiawww/sbox.key)
       -migrate
-            Migrate a LevelDB user database to CockroachDB
+            Migrate from one user database to another
             Required DB flag : None
-            Args             : None
-     -verifyidentities
-          Verify a user's identities do not violate any politeia rules. Invalid
-          identities are fixed.
-          Required DB flag : -cockroachdb
-          Args             : <username>
-
+            Args             : <fromDB> <toDB>
+                               Valid DBs are mysql, cockroachdb, leveldb
+      -verifyidentities
+            Verify a user's identities do not violate any politeia rules. Invalid
+            identities are fixed.
+            Required DB flag : -cockroachdb or -mysql 
+            Args             : <username>
       -resettotp
-          Reset a user's totp settings in case they are locked out and 
-          confirm identity. 
-          Required DB flag : -leveldb or -cockroachdb
-          LevelDB args     : <email>
-          CockroachDB args : <username>
+            Reset a user's totp settings in case they are locked out and 
+            confirm identity. 
+            Required DB flag : -leveldb, -cockroachdb or -mysql
+            LevelDB args     : <email>
+            CockroachDB args : <username>
 
 ### Examples
 
@@ -96,13 +103,17 @@ Testnet example:
 
     $ politeiawww_dbutil -testnet -cockroachdb -setadmin username true
 
-### Migrate from LevelDB to CockroachDB
+### Migrate user database
+
+The `-migrate` command allows you to migrate from one database type to another. 
+
+**Notes:**
+ - CockroachDB & MySQL encrypt data at rest so if you migrating from levelDB 
+ you will first need to create an encryption key using the `-createkey` command.  
 
-The `-migrate` command allows you to migrate a LevelDB instance to CockroachDB.
-CockroachDB encrypts data at rest so you will first need to create an
-encryption key using the `-createkey` command.  The flags `-datadir`, `-host`,
-`-rootcert`, `-clientcert`, `-clientkey`, and `-encryptionkey` only need to be
-set if they deviate from the defaults.
+ - The flags `-datadir`, `-cockroachdbhost`, `-rootcert`, `-clientcert`, 
+ `-clientkey`, `-encryptionkey` and `mysqlhost` only need to be set if they 
+ deviate from the defaults.
 
 Create an encryption key.
 
@@ -111,18 +122,18 @@ Create an encryption key.
 
 Migrate the user database.
 
-    $ politeiawww_dbutil -migrate
-    LevelDB     : ~/.politeiawww/data/mainnet/users
-    CockroachDB : localhost:26257 mainnet
-    Migrating records from LevelDB to CockroachDB...
+    $ politeiawww_dbutil -testnet -password grrr -migrate cockroachdb mysql
+    CockroachDB : localhost:26257 testnet3
+    MySQL : localhost:3306 testnet3
+    Migrating records from cockroachdb to mysql...
     Users migrated : 6
     Paywall index  : 5
     Done!
 
 Update your politeiawww.conf file.  The location of the encryption key may
 differ depending on your operating system.
 
-    userdb=cockroachdb
+    userdb=mysql
     encryptionkey=~/.politeiawww/sbox.key
 
 ### Stubbing Users