84 lines
1.7 KiB
Go
84 lines
1.7 KiB
Go
package rpc
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import (
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"github.com/mitchellh/packer/packer"
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"net/rpc"
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)
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// A Command is an implementation of the packer.Command interface where the
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// command is actually executed over an RPC connection.
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type command struct {
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client *rpc.Client
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}
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// A CommandServer wraps a packer.Command and makes it exportable as part
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// of a Golang RPC server.
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type CommandServer struct {
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command packer.Command
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}
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type CommandRunArgs struct {
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RPCAddress string
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Args []string
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}
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type CommandSynopsisArgs byte
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func Command(client *rpc.Client) *command {
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return &command{client}
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}
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func (c *command) Help() (result string) {
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err := c.client.Call("Command.Help", new(interface{}), &result)
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if err != nil {
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panic(err)
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}
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return
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}
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func (c *command) Run(env packer.Environment, args []string) (result int) {
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// Create and start the server for the Environment
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server := rpc.NewServer()
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RegisterEnvironment(server, env)
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rpcArgs := &CommandRunArgs{serveSingleConn(server), args}
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err := c.client.Call("Command.Run", rpcArgs, &result)
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if err != nil {
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panic(err)
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}
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return
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}
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func (c *command) Synopsis() (result string) {
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err := c.client.Call("Command.Synopsis", CommandSynopsisArgs(0), &result)
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if err != nil {
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panic(err)
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}
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return
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}
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func (c *CommandServer) Help(args *interface{}, reply *string) error {
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*reply = c.command.Help()
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return nil
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}
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func (c *CommandServer) Run(args *CommandRunArgs, reply *int) error {
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client, err := rpc.Dial("tcp", args.RPCAddress)
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if err != nil {
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return err
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}
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env := &Environment{client}
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*reply = c.command.Run(env, args.Args)
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return nil
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}
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func (c *CommandServer) Synopsis(args *CommandSynopsisArgs, reply *string) error {
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*reply = c.command.Synopsis()
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return nil
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}
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