Initial

rex_model/types.go

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+package model
+
+// Recieved from the client
+type UpdateCheck struct {
+	Addons []string // List of installed addons
+}
+
+// A set of addons along with version info
+type UpdateResponse struct {
+	Addons []AddonData
+}
+
+// Holds addon name and information about its latest version.
+// Used as response type.
+type AddonData struct {
+	name   string
+	latest string
+}
+
+func (*AddonData) new(name string, latest string) AddonData {
+	return AddonData{name, latest}
+}
+
+// Used as a cache between db
+type AddonCache interface {
+	check([]AddonData) // Checks list for new versions
+}
+
+type AddonDB interface {
+	lookUp(string) AddonData // Looks up the latest version of an addon
+	setLatest(string, string) // Sets the latest version of an addon
+}
+
+// The HTTP API gets a request from the client containing a list of installed addons.
+// This list is passed to the AddonCache which checks the list for new versions.
+// The AddonCache will check its LRUCache for the latest version of the addon.
+// If the lookup is a miss, the AddonCache will query the AddonDB for the latest version.
+// If the AddonDB has a lastChecked time that is older than a certain threshold, it will
+// query the remote server for the latest version and update the AddonDB.