85 lines
1.7 KiB
Go
85 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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mux *MuxConn
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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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mux *MuxConn
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}
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type CommandRunArgs struct {
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Args []string
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StreamId uint32
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}
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type CommandSynopsisArgs byte
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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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nextId := c.mux.NextId()
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server := newServerWithMux(c.mux, nextId)
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server.RegisterEnvironment(env)
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go server.Serve()
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rpcArgs := &CommandRunArgs{
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Args: args,
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StreamId: nextId,
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}
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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 := newClientWithMux(c.mux, args.StreamId)
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if err != nil {
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return NewBasicError(err)
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}
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defer client.Close()
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*reply = c.command.Run(client.Environment(), 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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