🎂

Author: wata727

go.mod

@@ -0,0 +1,10 @@
+module github.com/terraform-linters/tflint-plugin-sdk
+
+go 1.13
+
+require (
+	github.com/hashicorp/go-hclog v0.10.1
+	github.com/hashicorp/go-plugin v1.0.1
+	github.com/hashicorp/hcl/v2 v2.0.0
+	github.com/zclconf/go-cty v1.1.0
+)

go.sum

@@ -0,0 +1,83 @@
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plugin/client.go

@@ -0,0 +1,73 @@
+package plugin
+
+import (
+	"net/rpc"
+	"os"
+	"os/exec"
+
+	"github.com/hashicorp/go-hclog"
+	plugin "github.com/hashicorp/go-plugin"
+	"github.com/terraform-linters/tflint-plugin-sdk/tflint"
+)
+
+// Client is an RPC client for use by the host
+type Client struct {
+	rpcClient *rpc.Client
+	broker    *plugin.MuxBroker
+}
+
+// ClientOpts is an option for initializing the RPC client
+type ClientOpts struct {
+	Cmd *exec.Cmd
+}
+
+// NewClient is a wrapper of plugin.NewClient
+func NewClient(opts *ClientOpts) *plugin.Client {
+	return plugin.NewClient(&plugin.ClientConfig{
+		HandshakeConfig: handshakeConfig,
+		Plugins: map[string]plugin.Plugin{
+			"ruleset": &RuleSetPlugin{},
+		},
+		Cmd: opts.Cmd,
+		Logger: hclog.New(&hclog.LoggerOptions{
+			Name:   "plugin",
+			Output: os.Stderr,
+			Level:  hclog.LevelFromString(os.Getenv("TFLINT_LOG")),
+		}),
+	})
+}
+
+// RuleSetName queries the RPC server for RuleSetName
+func (c *Client) RuleSetName() (string, error) {
+	var resp string
+	err := c.rpcClient.Call("Plugin.RuleSetName", new(interface{}), &resp)
+	return resp, err
+}
+
+// RuleSetVersion queries the RPC server for RuleSetVersion
+func (c *Client) RuleSetVersion() (string, error) {
+	var resp string
+	err := c.rpcClient.Call("Plugin.RuleSetVersion", new(interface{}), &resp)
+	return resp, err
+}
+
+// RuleNames queries the RPC server for RuleNames
+func (c *Client) RuleNames() ([]string, error) {
+	var resp []string
+	err := c.rpcClient.Call("Plugin.RuleNames", new(interface{}), &resp)
+	return resp, err
+}
+
+// ApplyConfig queries the RPC server for ApplyConfig
+func (c *Client) ApplyConfig(config *tflint.Config) error {
+	return c.rpcClient.Call("Plugin.ApplyConfig", config, new(interface{}))
+}
+
+// Check queries the RPC server for Check
+// For bi-directional communication, you can pass a server that accepts Runner's queries
+func (c *Client) Check(server tflint.Server) error {
+	brokerID := c.broker.NextId()
+	go c.broker.AcceptAndServe(brokerID, server)
+
+	return c.rpcClient.Call("Plugin.Check", brokerID, new(interface{}))
+}

plugin/plugin.go

@@ -0,0 +1,43 @@
+package plugin
+
+import (
+	"encoding/gob"
+	"net/rpc"
+
+	plugin "github.com/hashicorp/go-plugin"
+	"github.com/hashicorp/hcl/v2"
+	"github.com/hashicorp/hcl/v2/hclsyntax"
+	"github.com/terraform-linters/tflint-plugin-sdk/tflint"
+)
+
+// handShakeConfig is used for UX. ProcotolVersion will be updated by incompatible changes
+var handshakeConfig = plugin.HandshakeConfig{
+	ProtocolVersion:  1,
+	MagicCookieKey:   "TFLINT_RULESET_PLUGIN",
+	MagicCookieValue: "5adSn1bX8nrDfgBqiAqqEkC6OE1h3iD8SqbMc5UUONx8x3xCF0KlPDsBRNDjoYDP",
+}
+
+// RuleSetPlugin is a wrapper to satisfy the interface of go-plugin
+type RuleSetPlugin struct {
+	impl tflint.RuleSet
+}
+
+// Server returns an RPC server acting as a plugin
+func (p *RuleSetPlugin) Server(b *plugin.MuxBroker) (interface{}, error) {
+	return &Server{impl: p.impl, broker: b}, nil
+}
+
+// Client returns an RPC client for use by the host
+func (RuleSetPlugin) Client(b *plugin.MuxBroker, c *rpc.Client) (interface{}, error) {
+	return &Client{rpcClient: c, broker: b}, nil
+}
+
+// In order to communicate the interface correctly with RPC,
+// the type of the related structure is registered in gob at the initial time.
+func init() {
+	gob.Register(&hclsyntax.TemplateExpr{})
+	gob.Register(&hclsyntax.LiteralValueExpr{})
+	gob.Register(&hclsyntax.ScopeTraversalExpr{})
+	gob.Register(hcl.TraverseRoot{})
+	gob.Register(hcl.TraverseAttr{})
+}

plugin/server.go

@@ -0,0 +1,62 @@
+package plugin
+
+import (
+	plugin "github.com/hashicorp/go-plugin"
+	"github.com/terraform-linters/tflint-plugin-sdk/tflint"
+)
+
+// Server is an RPC server acting as a plugin
+type Server struct {
+	impl   tflint.RuleSet
+	broker *plugin.MuxBroker
+}
+
+// ServeOpts is an option for serving a plugin
+// Each plugin can pass a RuleSet that represents its own functionality
+type ServeOpts struct {
+	RuleSet tflint.RuleSet
+}
+
+// Serve is a wrapper of plugin.Serve. This is entrypoint of all plugins
+func Serve(opts *ServeOpts) {
+	plugin.Serve(&plugin.ServeConfig{
+		HandshakeConfig: handshakeConfig,
+		Plugins: map[string]plugin.Plugin{
+			"ruleset": &RuleSetPlugin{impl: opts.RuleSet},
+		},
+	})
+}
+
+// RuleSetName replies its own the result of RuleSetName
+func (s *Server) RuleSetName(args interface{}, resp *string) error {
+	*resp = s.impl.RuleSetName()
+	return nil
+}
+
+// RuleSetVersion replies its own the result of RuleSetVersion
+func (s *Server) RuleSetVersion(args interface{}, resp *string) error {
+	*resp = s.impl.RuleSetVersion()
+	return nil
+}
+
+// RuleNames replies its own the result of RuleNames
+func (s *Server) RuleNames(args interface{}, resp *[]string) error {
+	*resp = s.impl.RuleNames()
+	return nil
+}
+
+// ApplyConfig applies the passed config to its own plugin implementation
+func (s *Server) ApplyConfig(config *tflint.Config, resp *interface{}) error {
+	s.impl.ApplyConfig(config)
+	return nil
+}
+
+// Check initializes an RPC client that can query to the host process and pass it to the Check method
+func (s *Server) Check(brokerID uint32, resp *interface{}) error {
+	conn, err := s.broker.Dial(brokerID)
+	if err != nil {
+		return err
+	}
+
+	return s.impl.Check(tflint.NewClient(conn))
+}