160 lines
3.5 KiB
Go
160 lines
3.5 KiB
Go
package write
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import (
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"flag"
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"fmt"
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"io"
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"github.com/hashicorp/consul/api"
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"github.com/hashicorp/consul/command/flags"
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"github.com/hashicorp/consul/command/helpers"
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"github.com/hashicorp/hcl"
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"github.com/mitchellh/cli"
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)
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func New(ui cli.Ui) *cmd {
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c := &cmd{UI: ui}
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c.init()
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return c
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}
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type cmd struct {
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UI cli.Ui
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flags *flag.FlagSet
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http *flags.HTTPFlags
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help string
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cas bool
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modifyIndex uint64
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testStdin io.Reader
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}
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func (c *cmd) init() {
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c.flags = flag.NewFlagSet("", flag.ContinueOnError)
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c.http = &flags.HTTPFlags{}
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c.flags.BoolVar(&c.cas, "cas", false,
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"Perform a Check-And-Set operation. Specifying this value also "+
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"requires the -modify-index flag to be set. The default value "+
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"is false.")
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c.flags.Uint64Var(&c.modifyIndex, "modify-index", 0,
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"Unsigned integer representing the ModifyIndex of the config entry. "+
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"This is used in combination with the -cas flag.")
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flags.Merge(c.flags, c.http.ClientFlags())
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flags.Merge(c.flags, c.http.ServerFlags())
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c.help = flags.Usage(help, c.flags)
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}
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type genericConfig struct {
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Kind1 string `hcl:"Kind"`
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Kind2 string `hcl:"kind"`
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}
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func (c *genericConfig) Kind() string {
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if c.Kind1 != "" {
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return c.Kind1
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}
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return c.Kind2
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}
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func decodeConfigEntryFromHCL(data string) (api.ConfigEntry, error) {
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// For why this is necessary see the comment block on api.DecodeConfigEntry.
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var generic genericConfig
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err := hcl.Decode(&generic, data)
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if err != nil {
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return nil, err
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}
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kindVal := generic.Kind()
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if kindVal == "" {
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return nil, fmt.Errorf("Payload does not contain a kind/Kind key at the top level")
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}
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entry, err := api.MakeConfigEntry(kindVal, "")
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if err != nil {
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return nil, err
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}
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err = hcl.Decode(entry, data)
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if err != nil {
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return nil, err
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}
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return entry, nil
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}
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func (c *cmd) Run(args []string) int {
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if err := c.flags.Parse(args); err != nil {
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return 1
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}
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args = c.flags.Args()
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if len(args) != 1 {
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c.UI.Error("Must provide exactly one positional argument to specify the config entry to write")
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return 1
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}
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data, err := helpers.LoadDataSourceNoRaw(args[0], c.testStdin)
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if err != nil {
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c.UI.Error(fmt.Sprintf("Failed to load data: %v", err))
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return 1
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}
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entry, err := decodeConfigEntryFromHCL(string(data))
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if err != nil {
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c.UI.Error(fmt.Sprintf("Failed to decode config entry input: %v", err))
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return 1
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}
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client, err := c.http.APIClient()
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if err != nil {
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c.UI.Error(fmt.Sprintf("Error connect to Consul agent: %s", err))
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return 1
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}
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entries := client.ConfigEntries()
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written := false
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if c.cas {
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written, _, err = entries.CAS(entry, c.modifyIndex, nil)
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} else {
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written, _, err = entries.Set(entry, nil)
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}
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if err != nil {
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c.UI.Error(fmt.Sprintf("Error writing config entry %q / %q: %v", entry.GetKind(), entry.GetName(), err))
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return 1
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}
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if !written {
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c.UI.Error(fmt.Sprintf("Config entry %q / %q not updated", entry.GetKind(), entry.GetName()))
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return 1
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}
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// TODO (mkeeler) should we output anything when successful
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return 0
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}
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func (c *cmd) Synopsis() string {
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return synopsis
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}
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func (c *cmd) Help() string {
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return flags.Usage(c.help, nil)
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}
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const synopsis = "Create or update a centralized config entry"
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const help = `
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Usage: consul config write [options] <configuration>
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Request a config entry to be created or updated. The configuration
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argument is either a file path or '-' to indicate that the config
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should be read from stdin. The data should be either in HCL or
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JSON form.
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Example (from file):
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$ consul config write web.service.hcl
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Example (from stdin):
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$ consul config write -
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`
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