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service.twirp.go
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// Code generated by protoc-gen-twirp v5.1.0, DO NOT EDIT.
// source: service.proto
/*
Package example is a generated twirp stub package.
This code was generated with github.com/twitchtv/twirp/protoc-gen-twirp v5.1.0.
It is generated from these files:
service.proto
*/
package example
import bytes "bytes"
import context "context"
import fmt "fmt"
import ioutil "io/ioutil"
import log "log"
import http "net/http"
import jsonpb "github.com/golang/protobuf/jsonpb"
import proto "github.com/golang/protobuf/proto"
import twirp "github.com/twitchtv/twirp"
import ctxsetters "github.com/twitchtv/twirp/ctxsetters"
// Imports only used by utility functions:
import io "io"
import strconv "strconv"
import json "encoding/json"
import url "net/url"
// =====================
// Haberdasher Interface
// =====================
// A Haberdasher makes hats for clients.
type Haberdasher interface {
// MakeHat produces a hat of mysterious, randomly-selected color!
MakeHat(context.Context, *Size) (*Hat, error)
}
// ===========================
// Haberdasher Protobuf Client
// ===========================
type haberdasherProtobufClient struct {
client HTTPClient
urls [1]string
}
// NewHaberdasherProtobufClient creates a Protobuf client that implements the Haberdasher interface.
// It communicates using protobuf messages and can be configured with a custom http.Client.
func NewHaberdasherProtobufClient(addr string, client HTTPClient) Haberdasher {
prefix := urlBase(addr) + HaberdasherPathPrefix
urls := [1]string{
prefix + "MakeHat",
}
if httpClient, ok := client.(*http.Client); ok {
return &haberdasherProtobufClient{
client: withoutRedirects(httpClient),
urls: urls,
}
}
return &haberdasherProtobufClient{
client: client,
urls: urls,
}
}
func (c *haberdasherProtobufClient) MakeHat(ctx context.Context, in *Size) (*Hat, error) {
out := new(Hat)
err := doProtoRequest(ctx, c.client, c.urls[0], in, out)
return out, err
}
// =======================
// Haberdasher JSON Client
// =======================
type haberdasherJSONClient struct {
client HTTPClient
urls [1]string
}
// NewHaberdasherJSONClient creates a JSON client that implements the Haberdasher interface.
// It communicates using JSON requests and responses instead of protobuf messages.
func NewHaberdasherJSONClient(addr string, client HTTPClient) Haberdasher {
prefix := urlBase(addr) + HaberdasherPathPrefix
urls := [1]string{
prefix + "MakeHat",
}
if httpClient, ok := client.(*http.Client); ok {
return &haberdasherJSONClient{
client: withoutRedirects(httpClient),
urls: urls,
}
}
return &haberdasherJSONClient{
client: client,
urls: urls,
}
}
func (c *haberdasherJSONClient) MakeHat(ctx context.Context, in *Size) (*Hat, error) {
out := new(Hat)
err := doJSONRequest(ctx, c.client, c.urls[0], in, out)
return out, err
}
// ==========================
// Haberdasher Server Handler
// ==========================
type haberdasherServer struct {
Haberdasher
hooks *twirp.ServerHooks
}
func NewHaberdasherServer(svc Haberdasher, hooks *twirp.ServerHooks) TwirpServer {
return &haberdasherServer{
Haberdasher: svc,
hooks: hooks,
}
}
// writeError writes an HTTP response with a valid Twirp error format, and triggers hooks.
// If err is not a twirp.Error, it will get wrapped with twirp.InternalErrorWith(err)
func (s *haberdasherServer) writeError(ctx context.Context, resp http.ResponseWriter, err error) {
writeError(ctx, resp, err, s.hooks)
}
// HaberdasherPathPrefix is used for all URL paths on a twirp Haberdasher server.
// Requests are always: POST HaberdasherPathPrefix/method
// It can be used in an HTTP mux to route twirp requests along with non-twirp requests on other routes.
const HaberdasherPathPrefix = "/twirp/twitch.twirp.example.Haberdasher/"
func (s *haberdasherServer) ServeHTTP(resp http.ResponseWriter, req *http.Request) {
ctx := req.Context()
ctx = ctxsetters.WithPackageName(ctx, "twitch.twirp.example")
ctx = ctxsetters.WithServiceName(ctx, "Haberdasher")
ctx = ctxsetters.WithResponseWriter(ctx, resp)
var err error
ctx, err = callRequestReceived(ctx, s.hooks)
if err != nil {
s.writeError(ctx, resp, err)
return
}
if req.Method != "POST" {
msg := fmt.Sprintf("unsupported method %q (only POST is allowed)", req.Method)
err = badRouteError(msg, req.Method, req.URL.Path)
s.writeError(ctx, resp, err)
return
}
switch req.URL.Path {
case "/twirp/twitch.twirp.example.Haberdasher/MakeHat":
s.serveMakeHat(ctx, resp, req)
return
default:
msg := fmt.Sprintf("no handler for path %q", req.URL.Path)
err = badRouteError(msg, req.Method, req.URL.Path)
s.writeError(ctx, resp, err)
return
}
}
func (s *haberdasherServer) serveMakeHat(ctx context.Context, resp http.ResponseWriter, req *http.Request) {
switch req.Header.Get("Content-Type") {
case "application/json":
s.serveMakeHatJSON(ctx, resp, req)
case "application/protobuf":
s.serveMakeHatProtobuf(ctx, resp, req)
default:
msg := fmt.Sprintf("unexpected Content-Type: %q", req.Header.Get("Content-Type"))
twerr := badRouteError(msg, req.Method, req.URL.Path)
s.writeError(ctx, resp, twerr)
}
}
func (s *haberdasherServer) serveMakeHatJSON(ctx context.Context, resp http.ResponseWriter, req *http.Request) {
var err error
ctx = ctxsetters.WithMethodName(ctx, "MakeHat")
ctx, err = callRequestRouted(ctx, s.hooks)
if err != nil {
s.writeError(ctx, resp, err)
return
}
defer closebody(req.Body)
reqContent := new(Size)
unmarshaler := jsonpb.Unmarshaler{AllowUnknownFields: true}
if err = unmarshaler.Unmarshal(req.Body, reqContent); err != nil {
err = wrapErr(err, "failed to parse request json")
s.writeError(ctx, resp, twirp.InternalErrorWith(err))
return
}
// Call service method
var respContent *Hat
func() {
defer func() {
// In case of a panic, serve a 500 error and then panic.
if r := recover(); r != nil {
s.writeError(ctx, resp, twirp.InternalError("Internal service panic"))
panic(r)
}
}()
respContent, err = s.MakeHat(ctx, reqContent)
}()
if err != nil {
s.writeError(ctx, resp, err)
return
}
if respContent == nil {
s.writeError(ctx, resp, twirp.InternalError("received a nil *Hat and nil error while calling MakeHat. nil responses are not supported"))
return
}
ctx = callResponsePrepared(ctx, s.hooks)
var buf bytes.Buffer
marshaler := &jsonpb.Marshaler{OrigName: true}
if err = marshaler.Marshal(&buf, respContent); err != nil {
err = wrapErr(err, "failed to marshal json response")
s.writeError(ctx, resp, twirp.InternalErrorWith(err))
return
}
ctx = ctxsetters.WithStatusCode(ctx, http.StatusOK)
resp.Header().Set("Content-Type", "application/json")
resp.WriteHeader(http.StatusOK)
if _, err = resp.Write(buf.Bytes()); err != nil {
log.Printf("errored while writing response to client, but already sent response status code to 200: %s", err)
}
callResponseSent(ctx, s.hooks)
}
func (s *haberdasherServer) serveMakeHatProtobuf(ctx context.Context, resp http.ResponseWriter, req *http.Request) {
var err error
ctx = ctxsetters.WithMethodName(ctx, "MakeHat")
ctx, err = callRequestRouted(ctx, s.hooks)
if err != nil {
s.writeError(ctx, resp, err)
return
}
defer closebody(req.Body)
buf, err := ioutil.ReadAll(req.Body)
if err != nil {
err = wrapErr(err, "failed to read request body")
s.writeError(ctx, resp, twirp.InternalErrorWith(err))
return
}
reqContent := new(Size)
if err = proto.Unmarshal(buf, reqContent); err != nil {
err = wrapErr(err, "failed to parse request proto")
s.writeError(ctx, resp, twirp.InternalErrorWith(err))
return
}
// Call service method
var respContent *Hat
func() {
defer func() {
// In case of a panic, serve a 500 error and then panic.
if r := recover(); r != nil {
s.writeError(ctx, resp, twirp.InternalError("Internal service panic"))
panic(r)
}
}()
respContent, err = s.MakeHat(ctx, reqContent)
}()
if err != nil {
s.writeError(ctx, resp, err)
return
}
if respContent == nil {
s.writeError(ctx, resp, twirp.InternalError("received a nil *Hat and nil error while calling MakeHat. nil responses are not supported"))
return
}
ctx = callResponsePrepared(ctx, s.hooks)
respBytes, err := proto.Marshal(respContent)
if err != nil {
err = wrapErr(err, "failed to marshal proto response")
s.writeError(ctx, resp, twirp.InternalErrorWith(err))
return
}
ctx = ctxsetters.WithStatusCode(ctx, http.StatusOK)
resp.Header().Set("Content-Type", "application/protobuf")
resp.WriteHeader(http.StatusOK)
if _, err = resp.Write(respBytes); err != nil {
log.Printf("errored while writing response to client, but already sent response status code to 200: %s", err)
}
callResponseSent(ctx, s.hooks)
}
func (s *haberdasherServer) ServiceDescriptor() ([]byte, int) {
return twirpFileDescriptor0, 0
}
func (s *haberdasherServer) ProtocGenTwirpVersion() string {
return "v5.1.0"
}
// =====
// Utils
// =====
// HTTPClient is the interface used by generated clients to send HTTP requests.
// It is fulfilled by *(net/http).Client, which is sufficient for most users.
// Users can provide their own implementation for special retry policies.
//
// HTTPClient implementations should not follow redirects. Redirects are
// automatically disabled if *(net/http).Client is passed to client
// constructors. See the withoutRedirects function in this file for more
// details.
type HTTPClient interface {
Do(req *http.Request) (*http.Response, error)
}
// TwirpServer is the interface generated server structs will support: they're
// HTTP handlers with additional methods for accessing metadata about the
// service. Those accessors are a low-level API for building reflection tools.
// Most people can think of TwirpServers as just http.Handlers.
type TwirpServer interface {
http.Handler
// ServiceDescriptor returns gzipped bytes describing the .proto file that
// this service was generated from. Once unzipped, the bytes can be
// unmarshalled as a
// github.com/golang/protobuf/protoc-gen-go/descriptor.FileDescriptorProto.
//
// The returned integer is the index of this particular service within that
// FileDescriptorProto's 'Service' slice of ServiceDescriptorProtos. This is a
// low-level field, expected to be used for reflection.
ServiceDescriptor() ([]byte, int)
// ProtocGenTwirpVersion is the semantic version string of the version of
// twirp used to generate this file.
ProtocGenTwirpVersion() string
}
// WriteError writes an HTTP response with a valid Twirp error format.
// If err is not a twirp.Error, it will get wrapped with twirp.InternalErrorWith(err)
func WriteError(resp http.ResponseWriter, err error) {
writeError(context.Background(), resp, err, nil)
}
// writeError writes Twirp errors in the response and triggers hooks.
func writeError(ctx context.Context, resp http.ResponseWriter, err error, hooks *twirp.ServerHooks) {
// Non-twirp errors are wrapped as Internal (default)
twerr, ok := err.(twirp.Error)
if !ok {
twerr = twirp.InternalErrorWith(err)
}
statusCode := twirp.ServerHTTPStatusFromErrorCode(twerr.Code())
ctx = ctxsetters.WithStatusCode(ctx, statusCode)
ctx = callError(ctx, hooks, twerr)
resp.Header().Set("Content-Type", "application/json") // Error responses are always JSON (instead of protobuf)
resp.WriteHeader(statusCode) // HTTP response status code
respBody := marshalErrorToJSON(twerr)
_, err2 := resp.Write(respBody)
if err2 != nil {
log.Printf("unable to send error message %q: %s", twerr, err2)
}
callResponseSent(ctx, hooks)
}
// urlBase helps ensure that addr specifies a scheme. If it is unparsable
// as a URL, it returns addr unchanged.
func urlBase(addr string) string {
// If the addr specifies a scheme, use it. If not, default to
// http. If url.Parse fails on it, return it unchanged.
url, err := url.Parse(addr)
if err != nil {
return addr
}
if url.Scheme == "" {
url.Scheme = "http"
}
return url.String()
}
// getCustomHTTPReqHeaders retrieves a copy of any headers that are set in
// a context through the twirp.WithHTTPRequestHeaders function.
// If there are no headers set, or if they have the wrong type, nil is returned.
func getCustomHTTPReqHeaders(ctx context.Context) http.Header {
header, ok := twirp.HTTPRequestHeaders(ctx)
if !ok || header == nil {
return nil
}
copied := make(http.Header)
for k, vv := range header {
if vv == nil {
copied[k] = nil
continue
}
copied[k] = make([]string, len(vv))
copy(copied[k], vv)
}
return copied
}
// closebody closes a response or request body and just logs
// any error encountered while closing, since errors are
// considered very unusual.
func closebody(body io.Closer) {
if err := body.Close(); err != nil {
log.Printf("error closing body: %q", err)
}
}
// newRequest makes an http.Request from a client, adding common headers.
func newRequest(ctx context.Context, url string, reqBody io.Reader, contentType string) (*http.Request, error) {
req, err := http.NewRequest("POST", url, reqBody)
if err != nil {
return nil, err
}
req = req.WithContext(ctx)
if customHeader := getCustomHTTPReqHeaders(ctx); customHeader != nil {
req.Header = customHeader
}
req.Header.Set("Content-Type", contentType)
req.Header.Set("Twirp-Version", "v5.1.0")
return req, nil
}
// JSON serialization for errors
type twerrJSON struct {
Code string `json:"code"`
Msg string `json:"msg"`
Meta map[string]string `json:"meta,omitempty"`
}
// marshalErrorToJSON returns JSON from a twirp.Error, that can be used as HTTP error response body.
// If serialization fails, it will use a descriptive Internal error instead.
func marshalErrorToJSON(twerr twirp.Error) []byte {
// make sure that msg is not too large
msg := twerr.Msg()
if len(msg) > 1e6 {
msg = msg[:1e6]
}
tj := twerrJSON{
Code: string(twerr.Code()),
Msg: msg,
Meta: twerr.MetaMap(),
}
buf, err := json.Marshal(&tj)
if err != nil {
buf = []byte("{\"type\": \"" + twirp.Internal + "\", \"msg\": \"There was an error but it could not be serialized into JSON\"}") // fallback
}
return buf
}
// errorFromResponse builds a twirp.Error from a non-200 HTTP response.
// If the response has a valid serialized Twirp error, then it's returned.
// If not, the response status code is used to generate a similar twirp
// error. See twirpErrorFromIntermediary for more info on intermediary errors.
func errorFromResponse(resp *http.Response) twirp.Error {
statusCode := resp.StatusCode
statusText := http.StatusText(statusCode)
if isHTTPRedirect(statusCode) {
// Unexpected redirect: it must be an error from an intermediary.
// Twirp clients don't follow redirects automatically, Twirp only handles
// POST requests, redirects should only happen on GET and HEAD requests.
location := resp.Header.Get("Location")
msg := fmt.Sprintf("unexpected HTTP status code %d %q received, Location=%q", statusCode, statusText, location)
return twirpErrorFromIntermediary(statusCode, msg, location)
}
respBodyBytes, err := ioutil.ReadAll(resp.Body)
if err != nil {
return clientError("failed to read server error response body", err)
}
var tj twerrJSON
if err := json.Unmarshal(respBodyBytes, &tj); err != nil {
// Invalid JSON response; it must be an error from an intermediary.
msg := fmt.Sprintf("Error from intermediary with HTTP status code %d %q", statusCode, statusText)
return twirpErrorFromIntermediary(statusCode, msg, string(respBodyBytes))
}
errorCode := twirp.ErrorCode(tj.Code)
if !twirp.IsValidErrorCode(errorCode) {
msg := "invalid type returned from server error response: " + tj.Code
return twirp.InternalError(msg)
}
twerr := twirp.NewError(errorCode, tj.Msg)
for k, v := range tj.Meta {
twerr = twerr.WithMeta(k, v)
}
return twerr
}
// twirpErrorFromIntermediary maps HTTP errors from non-twirp sources to twirp errors.
// The mapping is similar to gRPC: https://github.com/grpc/grpc/blob/master/doc/http-grpc-status-mapping.md.
// Returned twirp Errors have some additional metadata for inspection.
func twirpErrorFromIntermediary(status int, msg string, bodyOrLocation string) twirp.Error {
var code twirp.ErrorCode
if isHTTPRedirect(status) { // 3xx
code = twirp.Internal
} else {
switch status {
case 400: // Bad Request
code = twirp.Internal
case 401: // Unauthorized
code = twirp.Unauthenticated
case 403: // Forbidden
code = twirp.PermissionDenied
case 404: // Not Found
code = twirp.BadRoute
case 429, 502, 503, 504: // Too Many Requests, Bad Gateway, Service Unavailable, Gateway Timeout
code = twirp.Unavailable
default: // All other codes
code = twirp.Unknown
}
}
twerr := twirp.NewError(code, msg)
twerr = twerr.WithMeta("http_error_from_intermediary", "true") // to easily know if this error was from intermediary
twerr = twerr.WithMeta("status_code", strconv.Itoa(status))
if isHTTPRedirect(status) {
twerr = twerr.WithMeta("location", bodyOrLocation)
} else {
twerr = twerr.WithMeta("body", bodyOrLocation)
}
return twerr
}
func isHTTPRedirect(status int) bool {
return status >= 300 && status <= 399
}
// wrappedError implements the github.com/pkg/errors.Causer interface, allowing errors to be
// examined for their root cause.
type wrappedError struct {
msg string
cause error
}
func wrapErr(err error, msg string) error { return &wrappedError{msg: msg, cause: err} }
func (e *wrappedError) Cause() error { return e.cause }
func (e *wrappedError) Error() string { return e.msg + ": " + e.cause.Error() }
// clientError adds consistency to errors generated in the client
func clientError(desc string, err error) twirp.Error {
return twirp.InternalErrorWith(wrapErr(err, desc))
}
// badRouteError is used when the twirp server cannot route a request
func badRouteError(msg string, method, url string) twirp.Error {
err := twirp.NewError(twirp.BadRoute, msg)
err = err.WithMeta("twirp_invalid_route", method+" "+url)
return err
}
// The standard library will, by default, redirect requests (including POSTs) if it gets a 302 or
// 303 response, and also 301s in go1.8. It redirects by making a second request, changing the
// method to GET and removing the body. This produces very confusing error messages, so instead we
// set a redirect policy that always errors. This stops Go from executing the redirect.
//
// We have to be a little careful in case the user-provided http.Client has its own CheckRedirect
// policy - if so, we'll run through that policy first.
//
// Because this requires modifying the http.Client, we make a new copy of the client and return it.
func withoutRedirects(in *http.Client) *http.Client {
copy := *in
copy.CheckRedirect = func(req *http.Request, via []*http.Request) error {
if in.CheckRedirect != nil {
// Run the input's redirect if it exists, in case it has side effects, but ignore any error it
// returns, since we want to use ErrUseLastResponse.
err := in.CheckRedirect(req, via)
_ = err // Silly, but this makes sure generated code passes errcheck -blank, which some people use.
}
return http.ErrUseLastResponse
}
return ©
}
// doProtoRequest is common code to make a request to the remote twirp service.
func doProtoRequest(ctx context.Context, client HTTPClient, url string, in, out proto.Message) error {
var err error
reqBodyBytes, err := proto.Marshal(in)
if err != nil {
return clientError("failed to marshal proto request", err)
}
reqBody := bytes.NewBuffer(reqBodyBytes)
if err = ctx.Err(); err != nil {
return clientError("aborted because context was done", err)
}
req, err := newRequest(ctx, url, reqBody, "application/protobuf")
if err != nil {
return clientError("could not build request", err)
}
resp, err := client.Do(req)
if err != nil {
return clientError("failed to do request", err)
}
defer closebody(resp.Body)
if err = ctx.Err(); err != nil {
return clientError("aborted because context was done", err)
}
if resp.StatusCode != 200 {
return errorFromResponse(resp)
}
respBodyBytes, err := ioutil.ReadAll(resp.Body)
if err != nil {
return clientError("failed to read response body", err)
}
if err = ctx.Err(); err != nil {
return clientError("aborted because context was done", err)
}
if err = proto.Unmarshal(respBodyBytes, out); err != nil {
return clientError("failed to unmarshal proto response", err)
}
return nil
}
// doJSONRequest is common code to make a request to the remote twirp service.
func doJSONRequest(ctx context.Context, client HTTPClient, url string, in, out proto.Message) error {
var err error
reqBody := bytes.NewBuffer(nil)
marshaler := &jsonpb.Marshaler{OrigName: true}
if err = marshaler.Marshal(reqBody, in); err != nil {
return clientError("failed to marshal json request", err)
}
if err = ctx.Err(); err != nil {
return clientError("aborted because context was done", err)
}
req, err := newRequest(ctx, url, reqBody, "application/json")
if err != nil {
return clientError("could not build request", err)
}
resp, err := client.Do(req)
if err != nil {
return clientError("failed to do request", err)
}
defer closebody(resp.Body)
if err = ctx.Err(); err != nil {
return clientError("aborted because context was done", err)
}
if resp.StatusCode != 200 {
return errorFromResponse(resp)
}
unmarshaler := jsonpb.Unmarshaler{AllowUnknownFields: true}
if err = unmarshaler.Unmarshal(resp.Body, out); err != nil {
return clientError("failed to unmarshal json response", err)
}
if err = ctx.Err(); err != nil {
return clientError("aborted because context was done", err)
}
return nil
}
// Call twirp.ServerHooks.RequestReceived if the hook is available
func callRequestReceived(ctx context.Context, h *twirp.ServerHooks) (context.Context, error) {
if h == nil || h.RequestReceived == nil {
return ctx, nil
}
return h.RequestReceived(ctx)
}
// Call twirp.ServerHooks.RequestRouted if the hook is available
func callRequestRouted(ctx context.Context, h *twirp.ServerHooks) (context.Context, error) {
if h == nil || h.RequestRouted == nil {
return ctx, nil
}
return h.RequestRouted(ctx)
}
// Call twirp.ServerHooks.ResponsePrepared if the hook is available
func callResponsePrepared(ctx context.Context, h *twirp.ServerHooks) context.Context {
if h == nil || h.ResponsePrepared == nil {
return ctx
}
return h.ResponsePrepared(ctx)
}
// Call twirp.ServerHooks.ResponseSent if the hook is available
func callResponseSent(ctx context.Context, h *twirp.ServerHooks) {
if h == nil || h.ResponseSent == nil {
return
}
h.ResponseSent(ctx)
}
// Call twirp.ServerHooks.Error if the hook is available
func callError(ctx context.Context, h *twirp.ServerHooks, err twirp.Error) context.Context {
if h == nil || h.Error == nil {
return ctx
}
return h.Error(ctx, err)
}
var twirpFileDescriptor0 = []byte{
// 185 bytes of a gzipped FileDescriptorProto
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0x66, 0xb0, 0x20, 0x98, 0xad, 0x24, 0xc7, 0xc5, 0x12, 0x0c, 0xd2, 0x21, 0xc6, 0xc5, 0x96, 0x99,
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0xd9, 0x2b, 0xa5, 0x87, 0xcd, 0x55, 0x7a, 0x20, 0xd3, 0xa4, 0x24, 0xb1, 0xcb, 0x79, 0x24, 0x96,
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0xff, 0x8a, 0xbb, 0x3b, 0x6a, 0xee, 0x00, 0x00, 0x00,
}