telegraf/plugins/inputs/vsphere/client.go

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package vsphere
import (
"context"
"crypto/tls"
"log"
"net/url"
"strconv"
"strings"
"sync"
"time"
"github.com/vmware/govmomi"
"github.com/vmware/govmomi/object"
"github.com/vmware/govmomi/performance"
"github.com/vmware/govmomi/session"
"github.com/vmware/govmomi/view"
"github.com/vmware/govmomi/vim25"
"github.com/vmware/govmomi/vim25/methods"
"github.com/vmware/govmomi/vim25/soap"
)
// The highest number of metrics we can query for, no matter what settings
// and server say.
const absoluteMaxMetrics = 10000
// ClientFactory is used to obtain Clients to be used throughout the plugin. Typically,
// a single Client is reused across all functions and goroutines, but the client
// is periodically recycled to avoid authentication expiration issues.
type ClientFactory struct {
client *Client
mux sync.Mutex
url *url.URL
parent *VSphere
}
// Client represents a connection to vSphere and is backed by a govmoni connection
type Client struct {
Client *govmomi.Client
Views *view.Manager
Root *view.ContainerView
Perf *performance.Manager
Valid bool
Timeout time.Duration
closeGate sync.Once
}
// NewClientFactory creates a new ClientFactory and prepares it for use.
func NewClientFactory(ctx context.Context, url *url.URL, parent *VSphere) *ClientFactory {
return &ClientFactory{
client: nil,
parent: parent,
url: url,
}
}
// GetClient returns a client. The caller is responsible for calling Release()
// on the client once it's done using it.
func (cf *ClientFactory) GetClient(ctx context.Context) (*Client, error) {
cf.mux.Lock()
defer cf.mux.Unlock()
if cf.client == nil {
var err error
if cf.client, err = NewClient(ctx, cf.url, cf.parent); err != nil {
return nil, err
}
}
// Execute a dummy call against the server to make sure the client is
// still functional. If not, try to log back in. If that doesn't work,
// we give up.
ctx1, cancel1 := context.WithTimeout(ctx, cf.parent.Timeout.Duration)
defer cancel1()
if _, err := methods.GetCurrentTime(ctx1, cf.client.Client); err != nil {
log.Printf("I! [input.vsphere]: Client session seems to have time out. Reauthenticating!")
ctx2, cancel2 := context.WithTimeout(ctx, cf.parent.Timeout.Duration)
defer cancel2()
if cf.client.Client.SessionManager.Login(ctx2, url.UserPassword(cf.parent.Username, cf.parent.Password)) != nil {
return nil, err
}
}
return cf.client, nil
}
// NewClient creates a new vSphere client based on the url and setting passed as parameters.
func NewClient(ctx context.Context, u *url.URL, vs *VSphere) (*Client, error) {
sw := NewStopwatch("connect", u.Host)
defer sw.Stop()
tlsCfg, err := vs.ClientConfig.TLSConfig()
if err != nil {
return nil, err
}
// Use a default TLS config if it's missing
if tlsCfg == nil {
tlsCfg = &tls.Config{}
}
if vs.Username != "" {
u.User = url.UserPassword(vs.Username, vs.Password)
}
log.Printf("D! [input.vsphere]: Creating client: %s", u.Host)
soapClient := soap.NewClient(u, tlsCfg.InsecureSkipVerify)
// Add certificate if we have it. Use it to log us in.
if tlsCfg != nil && len(tlsCfg.Certificates) > 0 {
soapClient.SetCertificate(tlsCfg.Certificates[0])
}
// Set up custom CA chain if specified. We need to do this before we create the vim25 client,
// since it might fail on missing CA chains otherwise.
if vs.TLSCA != "" {
if err := soapClient.SetRootCAs(vs.TLSCA); err != nil {
return nil, err
}
}
ctx1, cancel1 := context.WithTimeout(ctx, vs.Timeout.Duration)
defer cancel1()
vimClient, err := vim25.NewClient(ctx1, soapClient)
if err != nil {
return nil, err
}
sm := session.NewManager(vimClient)
// If TSLKey is specified, try to log in as an extension using a cert.
if vs.TLSKey != "" {
ctx2, cancel2 := context.WithTimeout(ctx, vs.Timeout.Duration)
defer cancel2()
if err := sm.LoginExtensionByCertificate(ctx2, vs.TLSKey); err != nil {
return nil, err
}
}
// Create the govmomi client.
c := &govmomi.Client{
Client: vimClient,
SessionManager: sm,
}
// Only login if the URL contains user information.
if u.User != nil {
if err := c.Login(ctx, u.User); err != nil {
return nil, err
}
}
c.Timeout = vs.Timeout.Duration
m := view.NewManager(c.Client)
v, err := m.CreateContainerView(ctx, c.ServiceContent.RootFolder, []string{}, true)
if err != nil {
return nil, err
}
p := performance.NewManager(c.Client)
client := &Client{
Client: c,
Views: m,
Root: v,
Perf: p,
Valid: true,
Timeout: vs.Timeout.Duration,
}
// Adjust max query size if needed
ctx3, cancel3 := context.WithTimeout(ctx, vs.Timeout.Duration)
defer cancel3()
n, err := client.GetMaxQueryMetrics(ctx3)
if err != nil {
return nil, err
}
log.Printf("D! [input.vsphere] vCenter says max_query_metrics should be %d", n)
if n < vs.MaxQueryMetrics {
log.Printf("W! [input.vsphere] Configured max_query_metrics is %d, but server limits it to %d. Reducing.", vs.MaxQueryMetrics, n)
vs.MaxQueryMetrics = n
}
return client, nil
}
// Close shuts down a ClientFactory and releases any resources associated with it.
func (cf *ClientFactory) Close() {
cf.mux.Lock()
defer cf.mux.Unlock()
if cf.client != nil {
cf.client.close()
}
}
func (c *Client) close() {
// Use a Once to prevent us from panics stemming from trying
// to close it multiple times.
c.closeGate.Do(func() {
ctx, cancel := context.WithTimeout(context.Background(), c.Timeout)
defer cancel()
if c.Client != nil {
if err := c.Client.Logout(ctx); err != nil {
log.Printf("E! [input.vsphere]: Error during logout: %s", err)
}
}
})
}
// GetServerTime returns the time at the vCenter server
func (c *Client) GetServerTime(ctx context.Context) (time.Time, error) {
t, err := methods.GetCurrentTime(ctx, c.Client)
if err != nil {
return time.Time{}, err
}
return *t, nil
}
// GetMaxQueryMetrics returns the max_query_metrics setting as configured in vCenter
func (c *Client) GetMaxQueryMetrics(ctx context.Context) (int, error) {
ctx, cancel := context.WithTimeout(ctx, c.Timeout)
defer cancel()
om := object.NewOptionManager(c.Client.Client, *c.Client.Client.ServiceContent.Setting)
res, err := om.Query(ctx, "config.vpxd.stats.maxQueryMetrics")
if err == nil {
if len(res) > 0 {
if s, ok := res[0].GetOptionValue().Value.(string); ok {
v, err := strconv.Atoi(s)
if err == nil {
log.Printf("D! [input.vsphere] vCenter maxQueryMetrics is defined: %d", v)
if v == -1 {
// Whatever the server says, we never ask for more metrics than this.
return absoluteMaxMetrics, nil
}
return v, nil
}
}
// Fall through version-based inference if value isn't usable
}
} else {
log.Println("I! [input.vsphere] Option query for maxQueryMetrics failed. Using default")
}
// No usable maxQueryMetrics setting. Infer based on version
ver := c.Client.Client.ServiceContent.About.Version
parts := strings.Split(ver, ".")
if len(parts) < 2 {
log.Printf("W! [input.vsphere] vCenter returned an invalid version string: %s. Using default query size=64", ver)
return 64, nil
}
log.Printf("D! [input.vsphere] vCenter version is: %s", ver)
major, err := strconv.Atoi(parts[0])
if err != nil {
return 0, err
}
if major < 6 || major == 6 && parts[1] == "0" {
return 64, nil
}
return 256, nil
}