Add default built-in strategies.

Uses migration to define these activation strategies:
- applicationHostname
- gradualRolloutRandom
- gradualRolloutSessionId
- gradualRolloutUserId
- remoteAddress
- userWithId

closes #207

migrations/20170211085502-built-in-strategies.js

@@ -0,0 +1,15 @@
+/* eslint camelcase: "off" */
+'use strict';
+
+const async = require('async');
+
+exports.up = function (db, cb) {
+    async.series([
+        db.addColumn.bind(db, 'strategies', 'built_in', { type: 'int', defaultValue: 0 }),
+        db.runSql.bind(db, 'UPDATE strategies SET built_in=1 where name=\'default\''),
+    ], cb);
+};
+
+exports.down = function (db, cb) {
+    return db.removeColumn('strategies', 'built_in', cb);
+};

migrations/20170211090541-add-default-strategies.js

@@ -0,0 +1,37 @@
+/* eslint camelcase: "off" */
+'use strict';
+
+const strategies = require('./default-strategies.json');
+const async = require('async');
+
+function insertStrategySQL (strategy) {
+    return `
+        INSERT INTO strategies (name, description, parameters, built_in)
+        SELECT '${strategy.name}', '${strategy.description}', '${JSON.stringify(strategy.parameters)}', 1
+        WHERE
+            NOT EXISTS (
+                SELECT name FROM strategies WHERE name = '${strategy.name}'
+        );`;
+}
+
+function insertEventsSQL (strategy) {
+    return `
+        INSERT INTO events (type, created_by, data)
+        SELECT 'strategy-created', 'migration', '${JSON.stringify(strategy)}'
+        WHERE
+            NOT EXISTS (
+                SELECT name FROM strategies WHERE name = '${strategy.name}'
+        );`;
+}
+
+exports.up = function (db, callback) {
+    const insertStrategies = strategies.map((s) => (cb) => {
+        db.runSql(insertEventsSQL(s), cb);
+        db.runSql(insertStrategySQL(s), cb);
+    });
+    async.series(insertStrategies, callback);
+};
+
+exports.down = function (db, cb) {
+    return cb();
+};

migrations/default-strategies.json

@@ -0,0 +1,77 @@
+[
+  {
+    "name": "default",
+    "description": "Default on/off strategy.",
+    "parameters": []
+  },
+  {
+    "name": "userWithId",
+    "description": "Active for users with a userId defined in the userIds-list",
+    "parameters": [{
+      "name": "userIds",
+      "type": "list",
+      "description": "",
+      "required": false
+    }]
+  },
+  {
+    "name": "applicationHostname",
+    "description": "Active for client instances with a hostName in the hostNames-list.",
+    "parameters": [{
+      "name": "hostNames",
+      "type": "list",
+      "description": "List of hostnames to enable the feature toggle for.",
+      "required": false
+    }]
+  },
+  {
+    "name": "gradualRolloutRandom",
+    "description": "Randomly activate the feature toggle. No stickiness.",
+    "parameters": [{
+      "name": "percentage",
+      "type": "percentage",
+      "description": "",
+      "required": false
+    }]
+  },
+  {
+    "name": "gradualRolloutSessionId",
+    "description": "Gradually activate feature toggle. Stickiness based on session id.",
+    "parameters": [{
+      "name": "percentage",
+      "type": "percentage",
+      "description": "",
+      "required": false
+    },{
+      "name": "groupId",
+      "type": "string",
+      "description": "Used to define a activation groups, which allows you to correlate across feature toggles.",
+      "required": true
+    }]
+  },
+  {
+    "name": "gradualRolloutUserId",
+    "description": "Gradually activate feature toggle for logged in users. Stickiness based on user id.",
+    "parameters": [{
+      "name": "percentage",
+      "type": "percentage",
+      "description": "",
+      "required": false
+    },{
+      "name": "groupId",
+      "type": "string",
+      "description": "Used to define a activation groups, which allows you to correlate across feature toggles.",
+      "required": true
+    }]
+  },
+  {
+    "name": "remoteAddress",
+    "description": "Active for remote addresses defined in the IPs list.",
+    "parameters": [{
+      "name": "IPs",
+      "type": "list",
+      "description": "List of IPs to enable the feature toggle for.",
+      "required": true
+    }]
+  }
+]