142 lines
3.2 KiB
Go
142 lines
3.2 KiB
Go
package plugin
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import (
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"errors"
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"fmt"
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"io/ioutil"
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"log"
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"net"
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"net/rpc"
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"os"
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"os/signal"
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"runtime"
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"strconv"
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"sync/atomic"
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tfrpc "github.com/hashicorp/terraform/rpc"
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)
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// The APIVersion is outputted along with the RPC address. The plugin
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// client validates this API version and will show an error if it doesn't
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// know how to speak it.
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const APIVersion = "2"
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// The "magic cookie" is used to verify that the user intended to
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// actually run this binary. If this cookie isn't present as an
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// environmental variable, then we bail out early with an error.
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const MagicCookieKey = "TF_PLUGIN_MAGIC_COOKIE"
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const MagicCookieValue = "d602bf8f470bc67ca7faa0386276bbdd4330efaf76d1a219cb4d6991ca9872b2"
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func Serve(svc interface{}) error {
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// First check the cookie
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if os.Getenv(MagicCookieKey) != MagicCookieValue {
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fmt.Fprintf(os.Stderr,
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"This binary is a Terraform plugin. These are not meant to be\n"+
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"executed directly. Please execute `terraform`, which will load\n"+
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"any plugins automatically.\n")
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os.Exit(1)
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}
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// Create the server to serve our interface
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server := rpc.NewServer()
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// Register the service
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name, err := tfrpc.Register(server, svc)
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if err != nil {
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return err
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}
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// Register a listener so we can accept a connection
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listener, err := serverListener()
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if err != nil {
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return err
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}
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defer listener.Close()
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// Output the address and service name to stdout
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log.Printf("Plugin address: %s %s\n",
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listener.Addr().Network(), listener.Addr().String())
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fmt.Printf("%s|%s|%s|%s\n",
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APIVersion,
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listener.Addr().Network(),
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listener.Addr().String(),
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name)
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os.Stdout.Sync()
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// Accept a connection
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log.Println("Waiting for connection...")
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conn, err := listener.Accept()
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if err != nil {
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log.Printf("Error accepting connection: %s\n", err.Error())
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return err
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}
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// Eat the interrupts
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ch := make(chan os.Signal, 1)
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signal.Notify(ch, os.Interrupt)
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go func() {
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var count int32 = 0
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for {
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<-ch
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newCount := atomic.AddInt32(&count, 1)
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log.Printf(
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"Received interrupt signal (count: %d). Ignoring.",
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newCount)
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}
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}()
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// Serve a single connection
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log.Println("Serving a plugin connection...")
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server.ServeConn(conn)
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return nil
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}
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func serverListener() (net.Listener, error) {
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if runtime.GOOS == "windows" {
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return serverListener_tcp()
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}
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return serverListener_unix()
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}
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func serverListener_tcp() (net.Listener, error) {
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minPort, err := strconv.ParseInt(os.Getenv("TF_PLUGIN_MIN_PORT"), 10, 32)
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if err != nil {
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return nil, err
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}
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maxPort, err := strconv.ParseInt(os.Getenv("TF_PLUGIN_MAX_PORT"), 10, 32)
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if err != nil {
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return nil, err
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}
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for port := minPort; port <= maxPort; port++ {
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address := fmt.Sprintf("127.0.0.1:%d", port)
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listener, err := net.Listen("tcp", address)
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if err == nil {
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return listener, nil
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}
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}
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return nil, errors.New("Couldn't bind plugin TCP listener")
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}
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func serverListener_unix() (net.Listener, error) {
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tf, err := ioutil.TempFile("", "tf-plugin")
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if err != nil {
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return nil, err
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}
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path := tf.Name()
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// Close the file and remove it because it has to not exist for
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// the domain socket.
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if err := tf.Close(); err != nil {
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return nil, err
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}
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if err := os.Remove(path); err != nil {
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return nil, err
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}
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return net.Listen("unix", path)
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}
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