move implementation to internal/ directory (#828)

internal/rpc/dataconn/dataconn_shared.go

@@ -0,0 +1,36 @@
+package dataconn
+
+import (
+	"time"
+)
+
+const (
+	EndpointPing string = "/v1/ping"
+	EndpointSend string = "/v1/send"
+	EndpointRecv string = "/v1/recv"
+)
+
+const (
+	ReqHeader uint32 = 1 + iota
+	ReqStructured
+	ResHeader
+	ResStructured
+	ZFSStream
+)
+
+// Note that changing theses constants may break interop with other clients
+// Aggressive with timing, conservative (future compatible) with buffer sizes
+const (
+	HeartbeatInterval         = 5 * time.Second
+	HeartbeatPeerTimeout      = 10 * time.Second
+	RequestHeaderMaxSize      = 1 << 15
+	RequestStructuredMaxSize  = 1 << 22
+	ResponseHeaderMaxSize     = 1 << 15
+	ResponseStructuredMaxSize = 1 << 23
+)
+
+// the following are protocol constants
+const (
+	responseHeaderHandlerOk          = "HANDLER OK\n"
+	responseHeaderHandlerErrorPrefix = "HANDLER ERROR:\n"
+)