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memory.go
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memory.go
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package fingerprint
import (
"fmt"
log "github.com/hashicorp/go-hclog"
"github.com/hashicorp/nomad/nomad/structs"
"github.com/shirou/gopsutil/mem"
)
const bytesInMB = 1024 * 1024
// MemoryFingerprint is used to fingerprint the available memory on the node
type MemoryFingerprint struct {
StaticFingerprinter
logger log.Logger
}
// NewMemoryFingerprint is used to create a Memory fingerprint
func NewMemoryFingerprint(logger log.Logger) Fingerprint {
f := &MemoryFingerprint{
logger: logger.Named("memory"),
}
return f
}
func (f *MemoryFingerprint) Fingerprint(req *FingerprintRequest, resp *FingerprintResponse) error {
var totalMemory int
cfg := req.Config
if cfg.MemoryMB != 0 {
totalMemory = cfg.MemoryMB * bytesInMB
} else {
memInfo, err := mem.VirtualMemory()
if err != nil {
f.logger.Warn("error reading memory information", "error", err)
return err
}
if memInfo.Total > 0 {
totalMemory = int(memInfo.Total)
}
}
if totalMemory > 0 {
resp.AddAttribute("memory.totalbytes", fmt.Sprintf("%d", totalMemory))
// COMPAT(0.10): Remove in 0.10
resp.Resources = &structs.Resources{
MemoryMB: totalMemory / bytesInMB,
}
resp.NodeResources = &structs.NodeResources{
Memory: structs.NodeMemoryResources{
MemoryMB: int64(totalMemory / bytesInMB),
},
}
}
return nil
}