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subtool.go
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subtool.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 (
"errors"
"fmt"
"os"
"strings"
"time"
"github.com/nats-io/nsc/v2/cmd/store"
nats "github.com/nats-io/nats.go"
"github.com/spf13/cobra"
)
func createSubCmd() *cobra.Command {
var params SubParams
var cmd = &cobra.Command{
Use: "sub",
Short: "Subscribe to a subject on a NATS account",
Example: "nsc tool sub <subject>\nnsc tool --queue <name> subject",
Args: cobra.MinimumNArgs(1),
RunE: func(cmd *cobra.Command, args []string) error {
return RunAction(cmd, args, ¶ms)
},
}
cmd.Flags().StringVarP(¶ms.queue, "queue", "q", "", "subscription queue name")
cmd.Flags().IntVarP(¶ms.maxMessages, "max-messages", "", -1, "max messages")
cmd.Flags().BoolVarP(&encryptFlag, "encrypt", "E", false, "encrypted payload")
cmd.Flags().MarkHidden("max-messages")
cmd.Flags().MarkHidden("decrypt")
params.BindFlags(cmd)
return cmd
}
func init() {
toolCmd.AddCommand(createSubCmd())
hidden := createSubCmd()
hidden.Hidden = true
hidden.Example = "nsc sub <subject>\nnsc --queue <name> subject"
GetRootCmd().AddCommand(hidden)
}
type SubParams struct {
AccountUserContextParams
credsPath string
natsURLs []string
queue string
maxMessages int
}
func (p *SubParams) SetDefaults(ctx ActionCtx) error {
return p.AccountUserContextParams.SetDefaults(ctx)
}
func (p *SubParams) PreInteractive(ctx ActionCtx) error {
return p.AccountUserContextParams.Edit(ctx)
}
func (p *SubParams) 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 *SubParams) PostInteractive(ctx ActionCtx) error {
return nil
}
func (p *SubParams) Validate(ctx ActionCtx) error {
if err := p.AccountUserContextParams.Validate(ctx); err != nil {
return err
}
if p.maxMessages == 0 {
return errors.New("max-messages must be greater than zero")
}
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 *SubParams) Run(ctx ActionCtx) (store.Status, error) {
nc, err := nats.Connect(strings.Join(p.natsURLs, ", "),
createDefaultToolOptions("nsc_sub", ctx, nats.UserCredentials(p.credsPath))...)
if err != nil {
return nil, err
}
defer nc.Close()
subj := ctx.Args()[0]
// we are doing sync subs because we want the cli to cleanup properly
// when the command returns
var sub *nats.Subscription
if p.queue != "" {
sub, err = nc.QueueSubscribeSync(subj, p.queue)
if err != nil {
return nil, err
}
} else {
sub, err = nc.SubscribeSync(subj)
if err != nil {
return nil, err
}
}
if p.maxMessages > 0 {
if err := sub.AutoUnsubscribe(p.maxMessages); err != nil {
return nil, err
}
ctx.CurrentCmd().Printf("Listening on [%s] for %d messages\n", subj, p.maxMessages)
} else {
ctx.CurrentCmd().Printf("Listening on [%s]\n", subj)
}
if err := nc.Flush(); err != nil {
return nil, err
}
if err := nc.LastError(); err != nil {
return nil, err
}
var seed string
if encryptFlag {
// cannot fail if we are here
seed, err = ctx.StoreCtx().KeyStore.GetSeed(ctx.StoreCtx().Account.PublicKey)
if err != nil {
return nil, fmt.Errorf("unable to get the account private key to encrypt/decrypt the payload: %v", err)
}
}
i := 0
for {
msg, err := sub.NextMsg(10 * time.Second)
if err == nats.ErrTimeout {
continue
}
if err == nats.ErrMaxMessages {
break
}
if err == nats.ErrConnectionClosed {
break
}
if err != nil {
return nil, err
}
i++
if encryptFlag {
msg = maybeDecryptMessage(seed, msg)
}
ctx.CurrentCmd().Printf("[#%d] received on [%s]: '%s'\n", i, msg.Subject, string(msg.Data))
}
return nil, nil
}
func maybeDecryptMessage(seed string, msg *nats.Msg) *nats.Msg {
var dmsg nats.Msg
// last part of the subject will be encrypted
tokens := strings.Split(msg.Subject, ".")
k := tokens[len(tokens)-1]
kk, err := Decrypt(seed, []byte(k))
if err != nil {
dmsg.Subject = msg.Subject
} else {
tokens[len(tokens)-1] = string(kk)
dmsg.Subject = strings.Join(tokens, ".")
}
dmsg.Data, err = Decrypt(seed, msg.Data)
if err != nil {
dmsg.Data = msg.Data
}
return &dmsg
}