replace zxq.co/ripple/hanayo

vendor/github.com/osuripple/cheesegull/api/api.go

@@ -0,0 +1,144 @@
+// Package api contains the general framework for writing handlers in the
+// CheeseGull API.
+package api
+
+import (
+	"database/sql"
+	"encoding/json"
+	"errors"
+	"log"
+	"net/http"
+	"os"
+	"runtime/debug"
+	"time"
+
+	raven "github.com/getsentry/raven-go"
+	"github.com/julienschmidt/httprouter"
+
+	"github.com/osuripple/cheesegull/downloader"
+	"github.com/osuripple/cheesegull/housekeeper"
+)
+
+// Context is the information that is passed to all request handlers in relation
+// to the request, and how to answer it.
+type Context struct {
+	Request  *http.Request
+	DB       *sql.DB
+	SearchDB *sql.DB
+	House    *housekeeper.House
+	DLClient *downloader.Client
+	writer   http.ResponseWriter
+	params   httprouter.Params
+}
+
+// Write writes content to the response body.
+func (c *Context) Write(b []byte) (int, error) {
+	return c.writer.Write(b)
+}
+
+// ReadHeader reads a header from the request.
+func (c *Context) ReadHeader(s string) string {
+	return c.Request.Header.Get(s)
+}
+
+// WriteHeader sets a header in the response.
+func (c *Context) WriteHeader(key, value string) {
+	c.writer.Header().Set(key, value)
+}
+
+// Code sets the response's code.
+func (c *Context) Code(i int) {
+	c.writer.WriteHeader(i)
+}
+
+// Param retrieves a parameter in the URL's path.
+func (c *Context) Param(s string) string {
+	return c.params.ByName(s)
+}
+
+// WriteJSON writes JSON to the response.
+func (c *Context) WriteJSON(code int, v interface{}) error {
+	c.WriteHeader("Content-Type", "application/json; charset=utf-8")
+	c.Code(code)
+	return json.NewEncoder(c.writer).Encode(v)
+}
+
+var envSentryDSN = os.Getenv("SENTRY_DSN")
+
+// Err attempts to log an error to Sentry, as well as stdout.
+func (c *Context) Err(err error) {
+	if err == nil {
+		return
+	}
+	if envSentryDSN != "" {
+		raven.CaptureError(err, nil, raven.NewHttp(c.Request))
+	}
+	log.Println(err)
+}
+
+type handlerPath struct {
+	method, path string
+	f            func(c *Context)
+}
+
+var handlers []handlerPath
+
+// GET registers a handler for a GET request.
+func GET(path string, f func(c *Context)) {
+	handlers = append(handlers, handlerPath{"GET", path, f})
+}
+
+// POST registers a handler for a POST request.
+func POST(path string, f func(c *Context)) {
+	handlers = append(handlers, handlerPath{"POST", path, f})
+}
+
+// CreateHandler creates a new http.Handler using the handlers registered
+// through GET and POST.
+func CreateHandler(db, searchDB *sql.DB, house *housekeeper.House, dlc *downloader.Client) http.Handler {
+	r := httprouter.New()
+	for _, h := range handlers {
+		// Create local copy that we know won't change as the loop proceeds.
+		h := h
+		r.Handle(h.method, h.path, func(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
+			start := time.Now()
+			ctx := &Context{
+				Request:  r,
+				DB:       db,
+				SearchDB: searchDB,
+				House:    house,
+				DLClient: dlc,
+				writer:   w,
+				params:   p,
+			}
+			defer func() {
+				err := recover()
+				if err == nil {
+					return
+				}
+				switch err := err.(type) {
+				case error:
+					ctx.Err(err)
+				case stringer:
+					ctx.Err(errors.New(err.String()))
+				case string:
+					ctx.Err(errors.New(err))
+				default:
+					log.Println("PANIC", err)
+				}
+				debug.PrintStack()
+			}()
+			h.f(ctx)
+			log.Printf("[R] %-10s %-4s %s\n",
+				time.Since(start).String(),
+				r.Method,
+				r.URL.Path,
+			)
+		})
+	}
+	return r
+}
+
+type stringer interface {
+	String() string
+}