134 lines
2.9 KiB
Go
134 lines
2.9 KiB
Go
package warewulfd
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import (
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"strings"
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"sync"
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"github.com/pkg/errors"
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"github.com/hpcng/warewulf/internal/pkg/node"
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"github.com/hpcng/warewulf/internal/pkg/wwlog"
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)
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type nodeDB struct {
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lock sync.RWMutex
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NodeInfo map[string]node.NodeInfo
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}
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var (
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db nodeDB
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)
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func LoadNodeDB() error {
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db.lock.Lock()
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defer db.lock.Unlock()
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return loadNodeDB()
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}
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func loadNodeDB() error {
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TmpMap := make(map[string]node.NodeInfo)
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DB, err := node.New()
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if err != nil {
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return err
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}
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nodes, err := DB.FindAllNodes()
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if err != nil {
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return err
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}
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for _, n := range nodes {
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for _, netdev := range n.NetDevs {
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hwaddr := strings.ToLower(netdev.Hwaddr.Get())
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TmpMap[hwaddr] = n
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}
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}
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db.NodeInfo = TmpMap
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return nil
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}
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func GetNode(val string) (node.NodeInfo, error) {
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db.lock.RLock()
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defer db.lock.RUnlock()
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return getNode(val)
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}
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func getNode(val string) (node.NodeInfo, error) {
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if _, ok := db.NodeInfo[val]; ok {
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return db.NodeInfo[val], nil
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}
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var empty node.NodeInfo
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return empty, errors.New("No node found")
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}
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func GetNodeOrSetDiscoverable(hwaddr string) (node.NodeInfo, error) {
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db.lock.Lock()
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defer db.lock.Unlock()
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return getNodeOrSetDiscoverable(hwaddr)
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}
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func getNodeOrSetDiscoverable(hwaddr string) (node.NodeInfo, error) {
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// NOTE: since discoverable nodes will write an updated DB to file and then
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// reload, it is not enough to lock individual reads from the DB
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// to ensure the condition on which the node is updated is still satisfied
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// after the DB is read back in.
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n, err := getNode(hwaddr)
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if err == nil {
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return n, nil
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}
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// If we failed to find a node, let's see if we can add one...
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var netdev string
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wwlog.WarnExc(err, "%s (node not configured)", hwaddr)
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config, err := node.New()
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if err != nil {
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return n, errors.Wrapf(err, "%s (failed to read node configuration file)", hwaddr)
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}
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_n, netdev, err := config.FindDiscoverableNode()
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if err != nil {
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// NOTE: this is taken as there is no discoverable node, so return the
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// empty one
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return n, nil
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}
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_n.NetDevs[netdev].Hwaddr.Set(hwaddr)
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_n.Discoverable.SetB(false)
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// NOTE: errors here should return the empty node if the state cannot
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// be saved and re-loaded, since subsequent requests will be made on invalid
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// assumption that the database is up to date.
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err = config.NodeUpdate(_n)
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if err != nil {
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return n, errors.Wrapf(err, "%s (failed to set node configuration)", hwaddr)
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}
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err = config.Persist()
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if err != nil {
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return n, errors.Wrapf(err, "%s (failed to persist node configuration)", hwaddr)
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}
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err = loadNodeDB()
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if err != nil {
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return n, errors.Wrapf(err, "%s (failed to reload configuration)", hwaddr)
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}
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// NOTE: previously all overlays were built here, but that will also
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// be done automatically when attempting to serve an overlay that
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// hasn't been built (without blocking the database).
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wwlog.Serv("%s (node automatically configured)", hwaddr)
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// return the discovered node
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return _n, nil
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}
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