metrics: disable CPU stats (gosigar) on iOS (ethereum#20816)

metrics/cpu.go

@@ -16,21 +16,9 @@
 
 package metrics
 
-import "github.com/elastic/gosigar"
-
 // CPUStats is the system and process CPU stats.
 type CPUStats struct {
 	GlobalTime int64 // Time spent by the CPU working on all processes
 	GlobalWait int64 // Time spent by waiting on disk for all processes
 	LocalTime  int64 // Time spent by the CPU working on this process
 }
-
-// ReadCPUStats retrieves the current CPU stats.
-func ReadCPUStats(stats *CPUStats) {
-	global := gosigar.Cpu{}
-	global.Get()
-
-	stats.GlobalTime = int64(global.User + global.Nice + global.Sys)
-	stats.GlobalWait = int64(global.Wait)
-	stats.LocalTime = getProcessCPUTime()
-}

metrics/cpu_disabled.go

@@ -0,0 +1,23 @@
+// Copyright 2020 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/>.
+
+// +build ios
+
+package metrics
+
+// ReadCPUStats retrieves the current CPU stats. Internally this uses `gosigar`,
+// which is not supported on the platforms in this file.
+func ReadCPUStats(stats *CPUStats) {}

metrics/cpu_enabled.go

@@ -0,0 +1,31 @@
+// Copyright 2020 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/>.
+
+// +build !ios
+
+package metrics
+
+import "github.com/elastic/gosigar"
+
+// ReadCPUStats retrieves the current CPU stats.
+func ReadCPUStats(stats *CPUStats) {
+	global := gosigar.Cpu{}
+	global.Get()
+
+	stats.GlobalTime = int64(global.User + global.Nice + global.Sys)
+	stats.GlobalWait = int64(global.Wait)
+	stats.LocalTime = getProcessCPUTime()
+}