// NewWebService provides a way to create a new blank WebService
func NewWebService() WebService {
ws := WebService{}
// add standard routes
// Stats controller
ws.stats = stats.New()
statsController := NewWebController("/stats")
statsController.AddMethodHandler(Get, func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
w.WriteHeader(http.StatusOK)
b, _ := json.Marshal(ws.stats.Data())
w.Write(b)
})
ws.AddWebController(statsController)
// Heartbeat controller (echoes the default version info)
heartbeatController := NewWebController("/heartbeat")
heartbeatController.AddMethodHandler(Get, func(w http.ResponseWriter, r *http.Request) {
v := Version{}
v.Hydrate()
render.JSON(w, http.StatusOK, v)
})
ws.AddWebController(heartbeatController)
return ws
}
// Handles POST for /verify
func (validator accountValidator) AccountValidatorPost(w http.ResponseWriter, req *http.Request) {
var transformedRequest bankAccountRequest
// Decode the JSON payload
if err := json.NewDecoder(req.Body).Decode(&transformedRequest); err != nil {
responses.WriteUnprocessableEntity(w)
return
}
// Check that we got an expected format
if !transformedRequest.isValid() {
message := "Expected a 6 digits sort code and an account number between 6 and 10 digits."
responses.WriteMessage(http.StatusBadRequest, "invalid_bank_account", message, w)
return
}
// Create the required bank account
b := models.CreateBankAccount(transformedRequest.SortCode, transformedRequest.AccountNumber)
// Check if the bank account is valid
isValid := validator.resolver.IsValid(b)
// Construct and render the final response
response := ValidityResponse{
Valid: isValid,
SortCode: b.SortCode,
AccountNumber: b.AccountNumber,
}
render.JSON(w, http.StatusOK, response)
}
// Write a message with a given status code, a status and a message
func WriteMessage(code int, status string, message string, w http.ResponseWriter) {
response := APIMessage{
code: code,
Status: status,
Message: message,
}
render.JSON(w, response.code, response)
}
// NewWebService provides a way to create a new blank WebService
func NewWebService() WebService {
ws := WebService{}
// Heartbeat controller (echoes the default version info)
heartbeatController := NewWebController(HeartbeatRoute)
heartbeatController.AddMethodHandler(Get,
func(w http.ResponseWriter, r *http.Request) {
v := Version{}
v.Hydrate()
render.JSON(w, http.StatusOK, v)
},
)
ws.AddWebController(heartbeatController)
return ws
}
// BuildRouter collects all of the controllers, wires up the routes and returns
// the resulting router
func (ws *WebService) BuildRouter() *mux.Router {
// Router
//
// StrictSlash forces the routes to be applied literally...
// i.e. Route /foo/ with requests /foo will redirect to /foo/
// and route /bar with requests to /bar/ will redirect to /bar
r := mux.NewRouter().StrictSlash(true)
// Controllers
rootSeen := false
versionSeen := false
links := EndPoints{}
for _, wc := range ws.controllers {
if !rootSeen && wc.Route == root {
rootSeen = true
}
if !versionSeen && wc.Route == VersionRoute {
versionSeen = true
}
// Add the handler for a route, and rate-limit it using throttle
r.Handle(
wc.Route,
http.HandlerFunc(GetHandler(wc)),
)
links = append(links, EndPoint{URL: wc.Route, Methods: wc.GetAllowedMethods()})
}
// Profiling handlers
// XXX: should we add them using the public api too?
r.HandleFunc("/profiler/info.html", profiler.MemStatsHTMLHandler)
links = append(links, EndPoint{URL: "/profiler/info.html", Methods: "GET"})
r.HandleFunc("/profiler/info", profiler.ProfilingInfoJSONHandler)
r.HandleFunc("/profiler/start", profiler.StartProfilingHandler)
r.HandleFunc("/profiler/stop", profiler.StopProfilingHandler)
r.HandleFunc("/debug/pprof/", http.HandlerFunc(gopprof.Index))
links = append(links, EndPoint{URL: "/debug/pprof", Methods: "GET"})
r.HandleFunc("/debug/pprof/cmdline", http.HandlerFunc(gopprof.Cmdline))
r.HandleFunc("/debug/pprof/profile", http.HandlerFunc(gopprof.Profile))
r.HandleFunc("/debug/pprof/symbol", http.HandlerFunc(gopprof.Symbol))
if !versionSeen {
// If detailed version info is not provided, we echo the default
// This allows services to provide their own extended version info, i.e.
// database versioning as well as process versioning
r.HandleFunc(VersionRoute, func(w http.ResponseWriter, r *http.Request) {
v := Version{}
v.Hydrate()
render.JSON(w, http.StatusOK, v)
})
links = append(links, EndPoint{URL: VersionRoute, Methods: "GET"})
}
// The last routes are the NotFound routes as we want to return JSON.
//
// This handles / on it's own, and we should only do this if no other
// route already registered /
if !rootSeen {
sort.Sort(links)
r.HandleFunc(root, func(w http.ResponseWriter, r *http.Request) {
render.JSON(w, http.StatusOK, links)
})
}
// This is a wildcard route and will greedily consume all remaining routes
r.HandleFunc("/{path:.*}", func(w http.ResponseWriter, r *http.Request) {
render.Error(
w,
http.StatusNotFound,
fmt.Errorf("/%s not found", mux.Vars(r)["path"]),
)
})
return r
}
