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runtime.go
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runtime.go
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// Copyright 2015 go-swagger maintainers
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package client
import (
"fmt"
"mime"
"net/http"
"net/http/httputil"
"os"
"path"
"strings"
"github.com/go-swagger/go-swagger/client"
"github.com/go-swagger/go-swagger/httpkit"
"github.com/go-swagger/go-swagger/spec"
"github.com/go-swagger/go-swagger/strfmt"
"github.com/go-swagger/go-swagger/swag"
)
// Runtime represents an API client that uses the transport
// to make http requests based on a swagger specification.
type Runtime struct {
DefaultMediaType string
DefaultAuthentication client.AuthInfoWriter
Consumers map[string]httpkit.Consumer
Producers map[string]httpkit.Producer
Transport http.RoundTripper
Spec *spec.Document
Host string
BasePath string
Formats strfmt.Registry
Debug bool
client *http.Client
methodsAndPaths map[string]methodAndPath
}
// New creates a new default runtime for a swagger api client.
func New(swaggerSpec *spec.Document) *Runtime {
var rt Runtime
rt.DefaultMediaType = httpkit.JSONMime
// TODO: actually infer this stuff from the spec
rt.Consumers = map[string]httpkit.Consumer{
httpkit.JSONMime: httpkit.JSONConsumer(),
}
rt.Producers = map[string]httpkit.Producer{
httpkit.JSONMime: httpkit.JSONProducer(),
}
rt.Spec = swaggerSpec
rt.Transport = http.DefaultTransport
rt.client = http.DefaultClient
rt.client.Transport = rt.Transport
rt.Host = swaggerSpec.Host()
rt.BasePath = swaggerSpec.BasePath()
if !strings.HasPrefix(rt.BasePath, "/") {
rt.BasePath = "/" + rt.BasePath
}
rt.Debug = os.Getenv("DEBUG") == "1"
schemes := swaggerSpec.Spec().Schemes
if len(schemes) == 0 {
schemes = append(schemes, "http")
}
rt.methodsAndPaths = make(map[string]methodAndPath)
for mth, pathItem := range rt.Spec.Operations() {
for pth, op := range pathItem {
nm := ensureUniqueName(op.ID, mth, pth, rt.methodsAndPaths)
op.ID = nm
if len(op.Schemes) > 0 {
rt.methodsAndPaths[nm] = methodAndPath{mth, pth, op.Schemes}
} else {
rt.methodsAndPaths[nm] = methodAndPath{mth, pth, schemes}
}
}
}
return &rt
}
var namesCounter int64
func ensureUniqueName(key, method, path string, operations map[string]methodAndPath) string {
nm := key
if nm == "" {
nm = swag.ToGoName(strings.ToLower(method) + " " + path)
}
_, found := operations[nm]
if found {
namesCounter++
return fmt.Sprintf("%s%d", nm, namesCounter)
}
return nm
}
// Submit a request and when there is a body on success it will turn that into the result
// all other things are turned into an api error for swagger which retains the status code
func (r *Runtime) Submit(context *client.Operation) (interface{}, error) {
operationID, params, readResponse, auth := context.ID, context.Params, context.Reader, context.AuthInfo
mthPth, ok := r.methodsAndPaths[operationID]
if !ok {
return nil, fmt.Errorf("unknown operation: %q", operationID)
}
request, err := newRequest(mthPth.Method, mthPth.PathPattern, params)
if err != nil {
return nil, err
}
// TODO: infer most appropriate content type
request.SetHeaderParam(httpkit.HeaderContentType, r.DefaultMediaType)
var accept []string
for k := range r.Consumers {
accept = append(accept, k)
}
request.SetHeaderParam(httpkit.HeaderAccept, accept...)
if auth == nil && r.DefaultAuthentication != nil {
auth = r.DefaultAuthentication
}
if auth != nil {
if err := auth.AuthenticateRequest(request, r.Formats); err != nil {
return nil, err
}
}
req, err := request.BuildHTTP(r.Producers[r.DefaultMediaType], r.Formats)
// set the scheme
if req.URL.Scheme == "" {
req.URL.Scheme = "http"
}
schLen := len(mthPth.Schemes)
if schLen > 0 {
scheme := mthPth.Schemes[0]
// prefer https, but skip when not possible
if scheme != "https" && schLen > 1 {
for _, sch := range mthPth.Schemes {
if sch == "https" {
scheme = sch
break
}
}
}
req.URL.Scheme = scheme
}
req.URL.Host = r.Host
req.URL.Path = path.Join(r.BasePath, req.URL.Path)
if err != nil {
return nil, err
}
r.client.Transport = r.Transport
if r.Debug {
b, err := httputil.DumpRequestOut(req, true)
if err != nil {
return nil, err
}
fmt.Println(string(b))
}
res, err := r.client.Do(req) // make requests, by default follows 10 redirects before failing
if err != nil {
return nil, err
}
defer res.Body.Close()
if r.Debug {
b, err := httputil.DumpResponse(res, true)
if err != nil {
return nil, err
}
fmt.Println(string(b))
}
ct := res.Header.Get(httpkit.HeaderContentType)
if ct == "" { // this should really really never occur
ct = r.DefaultMediaType
}
mt, _, err := mime.ParseMediaType(ct)
if err != nil {
return nil, fmt.Errorf("parse content type: %s", err)
}
cons, ok := r.Consumers[mt]
if !ok {
// scream about not knowing what to do
return nil, fmt.Errorf("no consumer: %q", ct)
}
return readResponse.ReadResponse(response{res}, cons)
}