112 lines
3.6 KiB
Go
112 lines
3.6 KiB
Go
package plugin
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import (
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"github.com/hashicorp/go-plugin"
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grpcplugin "github.com/hashicorp/terraform/helper/plugin"
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"github.com/hashicorp/terraform/plugin/proto"
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"github.com/hashicorp/terraform/terraform"
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)
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// The constants below are the names of the plugins that can be dispensed
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// from the plugin server.
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const (
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ProviderPluginName = "provider"
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ProvisionerPluginName = "provisioner"
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)
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// Handshake is the HandshakeConfig used to configure clients and servers.
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var Handshake = plugin.HandshakeConfig{
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// The ProtocolVersion is the version that must match between TF core
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// and TF plugins. This should be bumped whenever a change happens in
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// one or the other that makes it so that they can't safely communicate.
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// This could be adding a new interface value, it could be how
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// helper/schema computes diffs, etc.
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ProtocolVersion: 4,
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// The magic cookie values should NEVER be changed.
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MagicCookieKey: "TF_PLUGIN_MAGIC_COOKIE",
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MagicCookieValue: "d602bf8f470bc67ca7faa0386276bbdd4330efaf76d1a219cb4d6991ca9872b2",
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}
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type ProviderFunc func() terraform.ResourceProvider
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type ProvisionerFunc func() terraform.ResourceProvisioner
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type GRPCProviderFunc func() proto.ProviderServer
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type GRPCProvisionerFunc func() proto.ProvisionerServer
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// ServeOpts are the configurations to serve a plugin.
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type ServeOpts struct {
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ProviderFunc ProviderFunc
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ProvisionerFunc ProvisionerFunc
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// Wrapped versions of the above plugins will automatically shimmed and
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// added to the GRPC functions when possible.
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GRPCProviderFunc GRPCProviderFunc
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GRPCProvisionerFunc GRPCProvisionerFunc
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}
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// Serve serves a plugin. This function never returns and should be the final
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// function called in the main function of the plugin.
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func Serve(opts *ServeOpts) {
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// since the plugins may not yet be aware of the new protocol, we
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// automatically wrap the plugins in the grpc shims.
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if opts.GRPCProviderFunc == nil && opts.ProviderFunc != nil {
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provider := grpcplugin.NewGRPCProviderServerShim(opts.ProviderFunc())
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// this is almost always going to be a *schema.Provider, but check that
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// we got back a valid provider just in case.
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if provider != nil {
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opts.GRPCProviderFunc = func() proto.ProviderServer {
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return provider
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}
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}
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}
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if opts.GRPCProvisionerFunc == nil && opts.ProvisionerFunc != nil {
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provider := grpcplugin.NewGRPCProvisionerServerShim(opts.ProvisionerFunc())
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if provider != nil {
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opts.GRPCProvisionerFunc = func() proto.ProvisionerServer {
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return provider
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}
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}
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}
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plugin.Serve(&plugin.ServeConfig{
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HandshakeConfig: Handshake,
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VersionedPlugins: pluginSet(opts),
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GRPCServer: plugin.DefaultGRPCServer,
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})
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}
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// pluginMap returns the legacy map[string]plugin.Plugin to use for configuring
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// a plugin server or client.
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func pluginMap(opts *ServeOpts) map[string]plugin.Plugin {
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return map[string]plugin.Plugin{
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"provider": &ResourceProviderPlugin{
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ResourceProvider: opts.ProviderFunc,
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},
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"provisioner": &ResourceProvisionerPlugin{
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ResourceProvisioner: opts.ProvisionerFunc,
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},
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}
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}
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func pluginSet(opts *ServeOpts) map[int]plugin.PluginSet {
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// Set the legacy netrpc plugins at version 4.
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// The oldest version is returned in when executed by a legacy go-plugin
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// client.
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plugins := map[int]plugin.PluginSet{
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4: pluginMap(opts),
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}
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// add the new protocol versions if they're configured
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if opts.GRPCProviderFunc != nil || opts.GRPCProvisionerFunc != nil {
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plugins[5] = plugin.PluginSet{
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"provider": &GRPCProviderPlugin{
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GRPCProvider: opts.GRPCProviderFunc,
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},
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"provisioner": &GRPCProvisionerPlugin{
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GRPCProvisioner: opts.GRPCProvisionerFunc,
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},
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}
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}
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return plugins
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}
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