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transport.go
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transport.go
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// Copyright (c) 2021 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package plugin
import (
"fmt"
"io"
"strings"
"go.uber.org/thriftrw/internal/envelope"
"go.uber.org/thriftrw/internal/multiplex"
"go.uber.org/thriftrw/plugin/api"
"go.uber.org/thriftrw/protocol"
"go.uber.org/atomic"
"go.uber.org/multierr"
)
var _proto = protocol.Binary
// transportHandle is a Handle to a plugin which is behind an envelope.Transport.
type transportHandle struct {
name string
Transport envelope.Transport
Client api.Plugin
Running *atomic.Bool
Features map[api.Feature]struct{}
}
// NewTransportHandle builds a new Handle which speaks to the given transport.
//
// If the transport is an io.Closer, it will be closed when the handle is closed.
func NewTransportHandle(name string, t envelope.Transport) (Handle, error) {
client := api.NewPluginClient(multiplex.NewClient(
"Plugin",
envelope.NewClient(_proto, t),
))
handshake, err := client.Handshake(&api.HandshakeRequest{})
if err != nil {
return nil, errHandshakeFailed{Name: name, Reason: err}
}
if handshake.Name != name {
return nil, errHandshakeFailed{
Name: name,
Reason: errNameMismatch{Want: name, Got: handshake.Name},
}
}
if handshake.APIVersion != api.APIVersion {
return nil, errHandshakeFailed{
Name: name,
Reason: errAPIVersionMismatch{Want: api.APIVersion, Got: handshake.APIVersion},
}
}
features := make(map[api.Feature]struct{}, len(handshake.Features))
for _, feature := range handshake.Features {
features[feature] = struct{}{}
}
return &transportHandle{
name: name,
Transport: t,
Client: client,
Running: atomic.NewBool(true),
Features: features,
}, nil
}
func (h *transportHandle) Name() string {
return h.name
}
func (h *transportHandle) Close() error {
if !h.Running.Swap(false) {
return nil // already closed
}
err := h.Client.Goodbye()
if closer, ok := h.Transport.(io.Closer); ok {
err = multierr.Append(err, closer.Close())
}
return err
}
func (h *transportHandle) ServiceGenerator() ServiceGenerator {
if !h.Running.Load() {
panic(fmt.Sprintf("handle for plugin %q has already been closed", h.name))
}
if _, hasFeature := h.Features[api.FeatureServiceGenerator]; !hasFeature {
return nil
}
return &serviceGenerator{
handle: h,
Running: h.Running,
ServiceGenerator: api.NewServiceGeneratorClient(multiplex.NewClient(
"ServiceGenerator",
envelope.NewClient(_proto, h.Transport),
)),
}
}
// serviceGenerator is a ServiceGenerator that validates the output of an ServiceGenerator.
//
// It also panics if a request is made to it after it has been closed.
type serviceGenerator struct {
handle *transportHandle
ServiceGenerator api.ServiceGenerator
Running *atomic.Bool
}
func (sg *serviceGenerator) Handle() Handle {
return sg.handle
}
func (sg *serviceGenerator) Generate(req *api.GenerateServiceRequest) (*api.GenerateServiceResponse, error) {
name := sg.handle.name
if !sg.Running.Load() {
panic(fmt.Sprintf("handle for plugin %q has already been closed", name))
}
res, err := sg.ServiceGenerator.Generate(req)
if err != nil {
return res, fmt.Errorf("plugin %q failed to generate service code: %v", name, err)
}
for path := range res.Files {
if strings.Contains(path, "..") {
return res, fmt.Errorf(
"plugin %q is attempting to write to a parent directory: "+
`path %q contains ".."`, name, path)
}
}
return res, nil
}