libpod: Add support for 'podman stats' on FreeBSD

[NO NEW TESTS NEEDED]

Signed-off-by: Doug Rabson <dfr@rabson.org>

2 files changed, 155 insertions, 2 deletions

diff --git a/libpod/stats_freebsd.go b/libpod/stats_freebsd.go
new file mode 100644
index 000000000..53bc3f19a
--- /dev/null
+++ b/libpod/stats_freebsd.go
@@ -0,0 +1,153 @@
+package libpod
+
+import (
+	"fmt"
+	"math"
+	"strings"
+	"time"
+
+	"github.com/containers/common/pkg/cgroups"
+	"github.com/containers/podman/v4/libpod/define"
+	"github.com/containers/podman/v4/pkg/rctl"
+	"github.com/containers/storage/pkg/system"
+	"github.com/sirupsen/logrus"
+)
+
+// getPlatformContainerStats gets the platform-specific running stats
+// for a given container.  The previousStats is used to correctly
+// calculate cpu percentages. You should pass nil if there is no
+// previous stat for this container.
+func (c *Container) getPlatformContainerStats(stats *define.ContainerStats, previousStats *define.ContainerStats) error {
+	now := uint64(time.Now().UnixNano())
+
+	jailName := c.ID()
+	if c.state.NetNS != nil {
+		jailName = c.state.NetNS.Name + "." + jailName
+	}
+	entries, err := rctl.GetRacct("jail:" + jailName)
+	if err != nil {
+		return fmt.Errorf("unable to read accounting for %s: %w", jailName, err)
+	}
+
+	// If the current total usage is less than what was previously
+	// recorded then it means the container was restarted and runs
+	// in a new jail
+	if dur, ok := entries["wallclock"]; ok {
+		if previousStats.Duration > dur*1000000000 {
+			previousStats = &define.ContainerStats{}
+		}
+	}
+
+	for key, val := range entries {
+		switch key {
+		case "cputime": // CPU time, in seconds
+			stats.CPUNano = val * 1000000000
+			stats.AvgCPU = calculateCPUPercent(stats.CPUNano, 0, now, uint64(c.state.StartedTime.UnixNano()))
+		case "datasize": // data size, in bytes
+		case "stacksize": // stack size, in bytes
+		case "coredumpsize": // core dump size, in bytes
+		case "memoryuse": // resident set size, in bytes
+			stats.MemUsage = val
+		case "memorylocked": // locked memory, in bytes
+		case "maxproc": // number of processes
+			stats.PIDs = val
+		case "openfiles": // file descriptor table size
+		case "vmemoryuse": // address space limit, in bytes
+		case "pseudoterminals": // number of PTYs
+		case "swapuse": // swap space that may be reserved or used, in bytes
+		case "nthr": // number of threads
+		case "msgqqueued": // number of queued SysV messages
+		case "msgqsize": // SysV message queue size, in bytes
+		case "nmsgq": // number of SysV message queues
+		case "nsem": // number of SysV semaphores
+		case "nsemop": // number of SysV semaphores modified in a single semop(2) call
+		case "nshm": // number of SysV shared memory segments
+		case "shmsize": // SysV shared memory size, in bytes
+		case "wallclock": // wallclock time, in seconds
+			stats.Duration = val * 1000000000
+			stats.UpTime = time.Duration(stats.Duration)
+		case "pcpu": // %CPU, in percents of a single CPU core
+			stats.CPU = float64(val)
+		case "readbps": // filesystem reads, in bytes per second
+			stats.BlockInput = val
+		case "writebps": // filesystem writes, in bytes per second
+			stats.BlockOutput = val
+		case "readiops": // filesystem reads, in operations per second
+		case "writeiops": // filesystem writes, in operations per second
+		}
+	}
+	stats.MemLimit = c.getMemLimit()
+	stats.SystemNano = now
+
+	netStats, err := getContainerNetIO(c)
+	if err != nil {
+		return err
+	}
+
+	// Handle case where the container is not in a network namespace
+	if netStats != nil {
+		stats.NetInput = netStats.TxBytes
+		stats.NetOutput = netStats.RxBytes
+	} else {
+		stats.NetInput = 0
+		stats.NetOutput = 0
+	}
+
+	return nil
+}
+
+// getMemory limit returns the memory limit for a container
+func (c *Container) getMemLimit() uint64 {
+	memLimit := uint64(math.MaxUint64)
+
+	if c.config.Spec.Linux != nil && c.config.Spec.Linux.Resources != nil &&
+		c.config.Spec.Linux.Resources.Memory != nil && c.config.Spec.Linux.Resources.Memory.Limit != nil {
+		memLimit = uint64(*c.config.Spec.Linux.Resources.Memory.Limit)
+	}
+
+	mi, err := system.ReadMemInfo()
+	if err != nil {
+		logrus.Errorf("ReadMemInfo error: %v", err)
+		return 0
+	}
+
+	//nolint:unconvert
+	physicalLimit := uint64(mi.MemTotal)
+
+	if memLimit <= 0 || memLimit > physicalLimit {
+		return physicalLimit
+	}
+
+	return memLimit
+}
+
+// calculateCPUPercent calculates the cpu usage using the latest measurement in stats.
+// previousCPU is the last value of stats.CPU.Usage.Total measured at the time previousSystem.
+//
+//	(now - previousSystem) is the time delta in nanoseconds, between the measurement in previousCPU
+//
+// and the updated value in stats.
+func calculateCPUPercent(currentCPU, previousCPU, now, previousSystem uint64) float64 {
+	var (
+		cpuPercent  = 0.0
+		cpuDelta    = float64(currentCPU - previousCPU)
+		systemDelta = float64(now - previousSystem)
+	)
+	if systemDelta > 0.0 && cpuDelta > 0.0 {
+		// gets a ratio of container cpu usage total, and multiplies that by 100 to get a percentage
+		cpuPercent = (cpuDelta / systemDelta) * 100
+	}
+	return cpuPercent
+}
+
+func calculateBlockIO(stats *cgroups.Metrics) (read uint64, write uint64) {
+	for _, blkIOEntry := range stats.Blkio.IoServiceBytesRecursive {
+		switch strings.ToLower(blkIOEntry.Op) {
+		case "read":
+			read += blkIOEntry.Value
+		case "write":
+			write += blkIOEntry.Value
+		}
+	}
+	return
+}
diff --git a/libpod/stats_unsupported.go b/libpod/stats_unsupported.go
index b23333c2e..3094e2eaa 100644
--- a/libpod/stats_unsupported.go
+++ b/libpod/stats_unsupported.go
@@ -1,5 +1,5 @@
-//go:build !linux
-// +build !linux
+//go:build !linux && !freebsd
+// +build !linux,!freebsd
 
 package libpod