dashboard: integrate Flow, sketch message API (#15713)

* dashboard: minor design change

* dashboard: Flow integration, message API

* dashboard: minor polishes, exclude misspell linter

dashboard/message.go

@@ -0,0 +1,63 @@
+// Copyright 2017 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package dashboard
+
+import "time"
+
+type Message struct {
+	Home    *HomeMessage    `json:"home,omitempty"`
+	Chain   *ChainMessage   `json:"chain,omitempty"`
+	TxPool  *TxPoolMessage  `json:"txpool,omitempty"`
+	Network *NetworkMessage `json:"network,omitempty"`
+	System  *SystemMessage  `json:"system,omitempty"`
+	Logs    *LogsMessage    `json:"logs,omitempty"`
+}
+
+type HomeMessage struct {
+	Memory  *Chart `json:"memory,omitempty"`
+	Traffic *Chart `json:"traffic,omitempty"`
+}
+
+type Chart struct {
+	History []*ChartEntry `json:"history,omitempty"`
+	New     *ChartEntry   `json:"new,omitempty"`
+}
+
+type ChartEntry struct {
+	Time  time.Time `json:"time,omitempty"`
+	Value float64   `json:"value,omitempty"`
+}
+
+type ChainMessage struct {
+	/* TODO (kurkomisi) */
+}
+
+type TxPoolMessage struct {
+	/* TODO (kurkomisi) */
+}
+
+type NetworkMessage struct {
+	/* TODO (kurkomisi) */
+}
+
+type SystemMessage struct {
+	/* TODO (kurkomisi) */
+}
+
+type LogsMessage struct {
+	Log string `json:"log,omitempty"`
+}