Global Blockchain Cache implementation. Automatically download other blockchains based on the limits in the config.

Started with a unified backend struct. Long term all lose vars should be put there, which in term will support multiple concurrent Peernet instances (users) within the same process.

Peernet.go

@@ -10,7 +10,7 @@ var userAgent = "Peernet Core/0.1" // must be overwritten by the caller
 
 // Init initializes the client. The config must be loaded first!
 // The User Agent must be provided in the form "Application Name/1.0".
-func Init(UserAgent string) {
+func Init(UserAgent string) (backend *Backend) {
 	if userAgent = UserAgent; userAgent == "" {
 		return
 	}
@@ -26,6 +26,13 @@ func Init(UserAgent string) {
 	initBroadcastIPv4()
 	initStore()
 	initNetwork()
+
+	backend = &Backend{}
+	backend.GlobalBlockchainCache = initBlockchainCache(config.BlockchainGlobal, config.CacheMaxBlockSize, config.CacheMaxBlockCount, config.LimitTotalRecords)
+
+	currentBackend = backend
+
+	return backend
 }
 
 // Connect starts bootstrapping and local peer discovery.
@@ -38,3 +45,12 @@ func Connect() {
 	go networks.startUPnP()
 	go autoBucketRefresh()
 }
+
+// The Backend represents an instance of a Peernet client to be used by a frontend.
+// Global variables and init functions are to be merged.
+type Backend struct {
+	GlobalBlockchainCache *BlockchainCache // stores other peers blockchains
+}
+
+// This variable is to be replaced later by pointers in structures.
+var currentBackend *Backend