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main.go
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main.go
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/*
Copyright 2014 Rohith All rights reserved.
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 main
import (
"flag"
"fmt"
"io/ioutil"
"net/http"
"os"
"github.com/golang/glog"
yaml "gopkg.in/yaml.v2"
)
type RestMethod struct {
// the uri of the method
URI string `yaml:"uri,omitempty"`
// the http method type (GET|PUT etc)
Method string `yaml:"method,omitempty"`
// the content i.e. response
Content string `yaml:"content,omitempty"`
}
var Options struct {
// the filename containing the methods
method_file string
// port we should be listening on
port int
}
func init() {
flag.StringVar(&Options.method_file, "methods", "methods.yml", "the name of the file containing the methods")
flag.IntVar(&Options.port, "port", 3000, "the port we should be listening on")
}
func main() {
flag.Parse()
if Options.method_file == "" {
glog.Errorf("You have not specified the methods file to import")
os.Exit(1)
}
// step: open and read in the methods yaml
contents, err := ioutil.ReadFile(Options.method_file)
if err != nil {
glog.Errorf("Failed to open|read the methods file: %s, error: %s", Options.method_file, err)
os.Exit(1)
}
// step: unmarshal the yaml
var methods []*RestMethod
err = yaml.Unmarshal([]byte(contents), &methods)
if err != nil {
glog.Errorf("Failed to unmarshall the method yaml file: %s, error: %s", Options.method_file, err)
os.Exit(1)
}
// step: construct a hash from the methods
uris := make(map[string]*string, 0)
for _, method := range methods {
uris[fmt.Sprintf("%s:%s", method.Method, method.URI)] = &method.Content
}
http.HandleFunc("/", func(writer http.ResponseWriter, reader *http.Request) {
key := fmt.Sprintf("%s:%s", reader.Method, reader.RequestURI)
glog.V(4).Infof("Request: uri: %s, method: %s", reader.RequestURI, reader.Method)
if content, found := uris[key]; found {
glog.V(4).Infof("Content: %s", *content)
writer.Header().Add("Content-Type", "application/json")
writer.Write([]byte(*content))
} else if !found {
http.Error(writer, "not found", 404)
}
})
glog.Fatal(http.ListenAndServe(fmt.Sprintf(":%d", Options.port), nil))
}