Split code into modules

This is a massive commit that restructures the code into modules:

db/
    All functions related to modifying the Database

types/
    All type definitions and methods that can be exclusivly used on
    these types without dependencies

policy/
    All Policy related code, now without dependencies on the Database.

policy/matcher/
    Dedicated code to match machines in a list of FilterRules

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

hscontrol/db/api_key_test.go

@@ -0,0 +1,97 @@
+package db
+
+import (
+	"time"
+
+	"gopkg.in/check.v1"
+)
+
+func (*Suite) TestCreateAPIKey(c *check.C) {
+	apiKeyStr, apiKey, err := db.CreateAPIKey(nil)
+	c.Assert(err, check.IsNil)
+	c.Assert(apiKey, check.NotNil)
+
+	// Did we get a valid key?
+	c.Assert(apiKey.Prefix, check.NotNil)
+	c.Assert(apiKey.Hash, check.NotNil)
+	c.Assert(apiKeyStr, check.Not(check.Equals), "")
+
+	_, err = db.ListAPIKeys()
+	c.Assert(err, check.IsNil)
+
+	keys, err := db.ListAPIKeys()
+	c.Assert(err, check.IsNil)
+	c.Assert(len(keys), check.Equals, 1)
+
+	c.Assert(channelUpdates, check.Equals, int32(0))
+}
+
+func (*Suite) TestAPIKeyDoesNotExist(c *check.C) {
+	key, err := db.GetAPIKey("does-not-exist")
+	c.Assert(err, check.NotNil)
+	c.Assert(key, check.IsNil)
+}
+
+func (*Suite) TestValidateAPIKeyOk(c *check.C) {
+	nowPlus2 := time.Now().Add(2 * time.Hour)
+	apiKeyStr, apiKey, err := db.CreateAPIKey(&nowPlus2)
+	c.Assert(err, check.IsNil)
+	c.Assert(apiKey, check.NotNil)
+
+	valid, err := db.ValidateAPIKey(apiKeyStr)
+	c.Assert(err, check.IsNil)
+	c.Assert(valid, check.Equals, true)
+
+	c.Assert(channelUpdates, check.Equals, int32(0))
+}
+
+func (*Suite) TestValidateAPIKeyNotOk(c *check.C) {
+	nowMinus2 := time.Now().Add(time.Duration(-2) * time.Hour)
+	apiKeyStr, apiKey, err := db.CreateAPIKey(&nowMinus2)
+	c.Assert(err, check.IsNil)
+	c.Assert(apiKey, check.NotNil)
+
+	valid, err := db.ValidateAPIKey(apiKeyStr)
+	c.Assert(err, check.IsNil)
+	c.Assert(valid, check.Equals, false)
+
+	now := time.Now()
+	apiKeyStrNow, apiKey, err := db.CreateAPIKey(&now)
+	c.Assert(err, check.IsNil)
+	c.Assert(apiKey, check.NotNil)
+
+	validNow, err := db.ValidateAPIKey(apiKeyStrNow)
+	c.Assert(err, check.IsNil)
+	c.Assert(validNow, check.Equals, false)
+
+	validSilly, err := db.ValidateAPIKey("nota.validkey")
+	c.Assert(err, check.NotNil)
+	c.Assert(validSilly, check.Equals, false)
+
+	validWithErr, err := db.ValidateAPIKey("produceerrorkey")
+	c.Assert(err, check.NotNil)
+	c.Assert(validWithErr, check.Equals, false)
+
+	c.Assert(channelUpdates, check.Equals, int32(0))
+}
+
+func (*Suite) TestExpireAPIKey(c *check.C) {
+	nowPlus2 := time.Now().Add(2 * time.Hour)
+	apiKeyStr, apiKey, err := db.CreateAPIKey(&nowPlus2)
+	c.Assert(err, check.IsNil)
+	c.Assert(apiKey, check.NotNil)
+
+	valid, err := db.ValidateAPIKey(apiKeyStr)
+	c.Assert(err, check.IsNil)
+	c.Assert(valid, check.Equals, true)
+
+	err = db.ExpireAPIKey(apiKey)
+	c.Assert(err, check.IsNil)
+	c.Assert(apiKey.Expiration, check.NotNil)
+
+	notValid, err := db.ValidateAPIKey(apiKeyStr)
+	c.Assert(err, check.IsNil)
+	c.Assert(notValid, check.Equals, false)
+
+	c.Assert(channelUpdates, check.Equals, int32(0))
+}