open-consul/command/intention/match/match.go

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package match
import (
"flag"
"fmt"
"io"
"github.com/hashicorp/consul/api"
"github.com/hashicorp/consul/command/flags"
"github.com/mitchellh/cli"
)
func New(ui cli.Ui) *cmd {
c := &cmd{UI: ui}
c.init()
return c
}
type cmd struct {
UI cli.Ui
flags *flag.FlagSet
http *flags.HTTPFlags
help string
// flags
flagSource bool
flagDestination bool
// testStdin is the input for testing.
testStdin io.Reader
}
func (c *cmd) init() {
c.flags = flag.NewFlagSet("", flag.ContinueOnError)
c.flags.BoolVar(&c.flagSource, "source", false,
"Match intentions with the given source.")
c.flags.BoolVar(&c.flagDestination, "destination", false,
"Match intentions with the given destination.")
c.http = &flags.HTTPFlags{}
flags.Merge(c.flags, c.http.ClientFlags())
flags.Merge(c.flags, c.http.ServerFlags())
flags.Merge(c.flags, c.http.MultiTenancyFlags())
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c.help = flags.Usage(help, c.flags)
}
func (c *cmd) Run(args []string) int {
if err := c.flags.Parse(args); err != nil {
return 2
}
args = c.flags.Args()
if len(args) != 1 {
c.UI.Error(fmt.Sprintf("Error: command requires exactly one argument: src or dst"))
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return 1
}
if c.flagSource && c.flagDestination {
c.UI.Error(fmt.Sprintf("Error: only one of -source or -destination may be specified"))
return 1
}
by := api.IntentionMatchDestination
if c.flagSource {
by = api.IntentionMatchSource
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}
// Create and test the HTTP client
client, err := c.http.APIClient()
if err != nil {
c.UI.Error(fmt.Sprintf("Error connecting to Consul agent: %s", err))
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return 1
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}
// Match the intention
matches, _, err := client.Connect().IntentionMatch(&api.IntentionMatch{
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By: by,
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Names: []string{args[0]},
}, nil)
if err != nil {
c.UI.Error(fmt.Sprintf("Error matching the connection: %s", err))
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return 1
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}
for _, ixn := range matches[args[0]] {
c.UI.Output(ixn.String())
}
return 0
}
func (c *cmd) Synopsis() string {
return synopsis
}
func (c *cmd) Help() string {
return c.help
}
const (
synopsis = "Show intentions that match a source or destination."
help = `
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Usage: consul intention match [options] SRC|DST
Show the list of intentions that would be enforced for a given source
or destination. The intentions are listed in the order they would be
evaluated.
$ consul intention match db
$ consul intention match -source web
`
)