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rtttool.go
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rtttool.go
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/*
* Copyright 2018-2019 The NATS 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 cmd
import (
"fmt"
"os"
"strings"
"time"
nats "github.com/nats-io/nats.go"
"github.com/nats-io/nsc/v2/cmd/store"
"github.com/spf13/cobra"
)
func createToolRTTCmd() *cobra.Command {
var params RttParams
var cmd = &cobra.Command{
Use: "rtt",
Short: "Calculate the round trip time to the server",
Example: "nsc tool rtt",
Args: cobra.MinimumNArgs(0),
RunE: func(cmd *cobra.Command, args []string) error {
return RunAction(cmd, args, ¶ms)
},
}
params.BindFlags(cmd)
return cmd
}
func init() {
toolCmd.AddCommand(createToolRTTCmd())
hidden := createToolRTTCmd()
hidden.Hidden = true
hidden.Example = "nsc tool rtt"
GetRootCmd().AddCommand(hidden)
}
type RttParams struct {
AccountUserContextParams
credsPath string
natsURLs []string
}
func (p *RttParams) SetDefaults(ctx ActionCtx) error {
return p.AccountUserContextParams.SetDefaults(ctx)
}
func (p *RttParams) PreInteractive(ctx ActionCtx) error {
return p.AccountUserContextParams.Edit(ctx)
}
func (p *RttParams) Load(ctx ActionCtx) error {
p.credsPath = ctx.StoreCtx().KeyStore.CalcUserCredsPath(p.AccountContextParams.Name, p.UserContextParams.Name)
if natsURLFlag != "" {
p.natsURLs = []string{natsURLFlag}
return nil
}
oc, err := ctx.StoreCtx().Store.ReadOperatorClaim()
if err != nil {
return err
}
p.natsURLs = oc.OperatorServiceURLs
return nil
}
func (p *RttParams) PostInteractive(ctx ActionCtx) error {
return nil
}
func (p *RttParams) Validate(ctx ActionCtx) error {
if err := p.AccountUserContextParams.Validate(ctx); err != nil {
return err
}
if p.credsPath == "" {
return fmt.Errorf("a creds file for account %q/%q was not found", p.AccountContextParams.Name, p.UserContextParams.Name)
}
_, err := os.Stat(p.credsPath)
if os.IsNotExist(err) {
return err
}
if len(p.natsURLs) == 0 {
return fmt.Errorf("operator %q doesn't have operator_service_urls set", ctx.StoreCtx().Operator.Name)
}
return nil
}
func (p *RttParams) Run(ctx ActionCtx) (store.Status, error) {
nc, err := nats.Connect(strings.Join(p.natsURLs, ", "),
createDefaultToolOptions("nsc_rtt", ctx, nats.UserCredentials(p.credsPath))...)
if err != nil {
return nil, err
}
defer nc.Close()
if err != nil {
return nil, err
}
start := time.Now()
if err := nc.Flush(); err != nil {
return nil, err
}
rtt := time.Since(start)
ctx.CurrentCmd().Printf("round trip time to [%s] = %v\n", nc.ConnectedUrl(), rtt)
return nil, nil
}