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app_node.go
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app_node.go
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//
// Copyright (c) 2015 The heketi Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package glusterfs
import (
"encoding/json"
"net/http"
"github.com/boltdb/bolt"
"github.com/gorilla/mux"
"github.com/heketi/heketi/pkg/glusterfs/api"
"github.com/heketi/heketi/pkg/utils"
)
func (a *App) NodeAdd(w http.ResponseWriter, r *http.Request) {
var msg api.NodeAddRequest
err := utils.GetJsonFromRequest(r, &msg)
if err != nil {
http.Error(w, "request unable to be parsed", 422)
return
}
// Check information in JSON request
if len(msg.Hostnames.Manage) == 0 {
http.Error(w, "Manage hostname missing", http.StatusBadRequest)
return
}
if len(msg.Hostnames.Storage) == 0 {
http.Error(w, "Storage hostname missing", http.StatusBadRequest)
return
}
// Zone value of 0 is not allowed because we do not know
// if it is because it was set to zero, or it is the default
// value used for missing 'zone' in JSON
if msg.Zone == 0 {
http.Error(w, "Zone cannot be zero or value is missing", http.StatusBadRequest)
return
}
// Check for correct values
for _, name := range append(msg.Hostnames.Manage, msg.Hostnames.Storage...) {
if name == "" {
http.Error(w, "Hostname cannot be an empty string", http.StatusBadRequest)
return
}
}
// Create a node entry
node := NewNodeEntryFromRequest(&msg)
// Get cluster and peer node
var cluster *ClusterEntry
var peer_node *NodeEntry
err = a.db.Update(func(tx *bolt.Tx) error {
var err error
cluster, err = NewClusterEntryFromId(tx, msg.ClusterId)
if err == ErrNotFound {
http.Error(w, "Cluster id does not exist", http.StatusNotFound)
return err
} else if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return err
}
// Register node
err = node.Register(tx)
if err != nil {
http.Error(w, err.Error(), http.StatusConflict)
return err
}
// Get a node in the cluster to execute the Gluster peer command
// only if there is more than one node
if len(cluster.Info.Nodes) > 0 {
peer_node, err = cluster.NodeEntryFromClusterIndex(tx, 0)
if err != nil {
logger.Err(err)
return err
}
}
return nil
})
if err != nil {
return
}
// Add node
logger.Info("Adding node %v", node.ManageHostName())
a.asyncManager.AsyncHttpRedirectFunc(w, r, func() (seeother string, e error) {
// Cleanup in case of failure
defer func() {
if e != nil {
a.db.Update(func(tx *bolt.Tx) error {
node.Deregister(tx)
return nil
})
}
}()
// Peer probe if there is at least one other node
// TODO: What happens if the peer_node is not responding.. we need to choose another.
if peer_node != nil {
err := a.executor.PeerProbe(peer_node.ManageHostName(), node.StorageHostName())
if err != nil {
return "", err
}
}
// Add node entry into the db
err = a.db.Update(func(tx *bolt.Tx) error {
cluster, err := NewClusterEntryFromId(tx, msg.ClusterId)
if err == ErrNotFound {
http.Error(w, "Cluster id does not exist", http.StatusNotFound)
return err
} else if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return err
}
// Add node to cluster
cluster.NodeAdd(node.Info.Id)
// Save cluster
err = cluster.Save(tx)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return err
}
// Save node
err = node.Save(tx)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return err
}
return nil
})
if err != nil {
return "", err
}
logger.Info("Added node " + node.Info.Id)
return "/nodes/" + node.Info.Id, nil
})
}
func (a *App) NodeInfo(w http.ResponseWriter, r *http.Request) {
// Get node id from URL
vars := mux.Vars(r)
id := vars["id"]
// Get Node information
var info *api.NodeInfoResponse
err := a.db.View(func(tx *bolt.Tx) error {
entry, err := NewNodeEntryFromId(tx, id)
if err == ErrNotFound {
http.Error(w, "Id not found", http.StatusNotFound)
return err
} else if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return err
}
info, err = entry.NewInfoReponse(tx)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return err
}
return nil
})
if err != nil {
return
}
// Write msg
w.Header().Set("Content-Type", "application/json; charset=UTF-8")
w.WriteHeader(http.StatusOK)
if err := json.NewEncoder(w).Encode(info); err != nil {
panic(err)
}
}
func (a *App) NodeDelete(w http.ResponseWriter, r *http.Request) {
// Get the id from the URL
vars := mux.Vars(r)
id := vars["id"]
// Get node info
var (
peer_node, node *NodeEntry
cluster *ClusterEntry
)
err := a.db.View(func(tx *bolt.Tx) error {
// Access node entry
var err error
node, err = NewNodeEntryFromId(tx, id)
if err == ErrNotFound {
http.Error(w, err.Error(), http.StatusNotFound)
return err
} else if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return logger.Err(err)
}
// Check the node can be deleted
if !node.IsDeleteOk() {
http.Error(w, node.ConflictString(), http.StatusConflict)
return ErrConflict
}
// Access cluster information and peer node
cluster, err = NewClusterEntryFromId(tx, node.Info.ClusterId)
if err == ErrNotFound {
http.Error(w, "Cluster id does not exist", http.StatusNotFound)
return err
} else if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return logger.Err(err)
}
// Get a node in the cluster to execute the Gluster peer command
// If it only has one in the list, then there is no need to do a
// peer detach.
if len(cluster.Info.Nodes) > 1 {
for index := range cluster.Info.Nodes {
peer_node, err = cluster.NodeEntryFromClusterIndex(tx, index)
if err != nil {
return logger.Err(err)
}
// Cannot peer detach from the same node, we need to execute
// the command from another node
if peer_node.Info.Id != node.Info.Id {
break
}
}
}
return nil
})
if err != nil {
return
}
// Delete node asynchronously
logger.Info("Deleting node %v [%v]", node.ManageHostName(), node.Info.Id)
a.asyncManager.AsyncHttpRedirectFunc(w, r, func() (string, error) {
// Remove from trusted pool
if peer_node != nil {
err := a.executor.PeerDetach(peer_node.ManageHostName(), node.StorageHostName())
if err != nil {
return "", err
}
}
// Remove from db
err = a.db.Update(func(tx *bolt.Tx) error {
// Get Cluster
cluster, err := NewClusterEntryFromId(tx, node.Info.ClusterId)
if err == ErrNotFound {
logger.Critical("Cluster id %v is expected be in db. Pointed to by node %v",
node.Info.ClusterId,
node.Info.Id)
return err
} else if err != nil {
logger.Err(err)
return err
}
cluster.NodeDelete(node.Info.Id)
// Save cluster
err = cluster.Save(tx)
if err != nil {
logger.Err(err)
return err
}
// Remove hostnames
node.Deregister(tx)
// Delete node from db
err = node.Delete(tx)
if err != nil {
logger.Err(err)
return err
}
return nil
})
if err != nil {
return "", err
}
// Show that the key has been deleted
logger.Info("Deleted node [%s]", id)
return "", nil
})
}
func (a *App) NodeSetState(w http.ResponseWriter, r *http.Request) {
// Get the id from the URL
vars := mux.Vars(r)
id := vars["id"]
// Unmarshal JSON
var msg api.StateRequest
err := utils.GetJsonFromRequest(r, &msg)
if err != nil {
http.Error(w, "request unable to be parsed", 422)
return
}
// Check state is supported
err = a.db.Update(func(tx *bolt.Tx) error {
node, err := NewNodeEntryFromId(tx, id)
if err == ErrNotFound {
http.Error(w, "Id not found", http.StatusNotFound)
return err
} else if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return err
}
// Set state
err = node.SetState(tx, a.allocator, msg.State)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return err
}
// Save new state
err = node.Save(tx)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return err
}
return nil
})
if err != nil {
return
}
}