terraform/plugin/serve.go

76 lines
2.6 KiB
Go

package plugin
import (
"github.com/hashicorp/go-plugin"
proto "github.com/hashicorp/terraform/internal/tfplugin5"
)
const (
// The constants below are the names of the plugins that can be dispensed
// from the plugin server.
ProviderPluginName = "provider"
ProvisionerPluginName = "provisioner"
// DefaultProtocolVersion is the protocol version assumed for legacy clients that don't specify
// a particular version during their handshake. This is the version used when Terraform 0.10
// and 0.11 launch plugins that were built with support for both versions 4 and 5, and must
// stay unchanged at 4 until we intentionally build plugins that are not compatible with 0.10 and
// 0.11.
DefaultProtocolVersion = 4
)
// Handshake is the HandshakeConfig used to configure clients and servers.
var Handshake = plugin.HandshakeConfig{
// The ProtocolVersion is the version that must match between TF core
// and TF plugins. This should be bumped whenever a change happens in
// one or the other that makes it so that they can't safely communicate.
// This could be adding a new interface value, it could be how
// helper/schema computes diffs, etc.
ProtocolVersion: DefaultProtocolVersion,
// The magic cookie values should NEVER be changed.
MagicCookieKey: "TF_PLUGIN_MAGIC_COOKIE",
MagicCookieValue: "d602bf8f470bc67ca7faa0386276bbdd4330efaf76d1a219cb4d6991ca9872b2",
}
type GRPCProviderFunc func() proto.ProviderServer
type GRPCProvisionerFunc func() proto.ProvisionerServer
// ServeOpts are the configurations to serve a plugin.
type ServeOpts struct {
// Wrapped versions of the above plugins will automatically shimmed and
// added to the GRPC functions when possible.
GRPCProviderFunc GRPCProviderFunc
GRPCProvisionerFunc GRPCProvisionerFunc
}
// Serve serves a plugin. This function never returns and should be the final
// function called in the main function of the plugin.
func Serve(opts *ServeOpts) {
plugin.Serve(&plugin.ServeConfig{
HandshakeConfig: Handshake,
VersionedPlugins: pluginSet(opts),
GRPCServer: plugin.DefaultGRPCServer,
})
}
func pluginSet(opts *ServeOpts) map[int]plugin.PluginSet {
plugins := map[int]plugin.PluginSet{}
// add the new protocol versions if they're configured
if opts.GRPCProviderFunc != nil || opts.GRPCProvisionerFunc != nil {
plugins[5] = plugin.PluginSet{}
if opts.GRPCProviderFunc != nil {
plugins[5]["provider"] = &GRPCProviderPlugin{
GRPCProvider: opts.GRPCProviderFunc,
}
}
if opts.GRPCProvisionerFunc != nil {
plugins[5]["provisioner"] = &GRPCProvisionerPlugin{
GRPCProvisioner: opts.GRPCProvisionerFunc,
}
}
}
return plugins
}