func Stats(containerDir string, containerMemoryLimit int64, machineMemory int64) (*ResourceStats, error) {
f, err := os.Open(filepath.Join(containerDir, "state.json"))
if err != nil {
return nil, err
}
defer f.Close()
type network struct {
Type string
HostInterfaceName string
}
state := struct {
CgroupPaths map[string]string `json:"cgroup_paths"`
Networks []network
}{}
if err := json.NewDecoder(f).Decode(&state); err != nil {
return nil, err
}
now := time.Now()
mgr := fs.Manager{Paths: state.CgroupPaths}
cstats, err := mgr.GetStats()
if err != nil {
return nil, err
}
stats := &libcontainer.Stats{CgroupStats: cstats}
// if the container does not have any memory limit specified set the
// limit to the machines memory
memoryLimit := containerMemoryLimit
if memoryLimit == 0 {
memoryLimit = machineMemory
}
for _, iface := range state.Networks {
switch iface.Type {
case "veth":
istats, err := getNetworkInterfaceStats(iface.HostInterfaceName)
if err != nil {
return nil, err
}
stats.Interfaces = append(stats.Interfaces, istats)
}
}
return &ResourceStats{
Stats: stats,
Read: now,
MemoryLimit: memoryLimit,
}, nil
}
