Golang httputil.RecoverJSON函数代码示例

func (sh *Handler) serveSignerAttrValue(rw http.ResponseWriter, req *http.Request) {
	defer httputil.RecoverJSON(rw, req)
	signer := httputil.MustGetBlobRef(req, "signer")
	attr := httputil.MustGet(req, "attr")
	value := httputil.MustGet(req, "value")

	pn, err := sh.index.PermanodeOfSignerAttrValue(signer, attr, value)
	if err != nil {
		httputil.ServeJSONError(rw, err)
		return
	}

	dr := sh.NewDescribeRequest()
	dr.Describe(pn, 2)
	metaMap, err := dr.metaMap()
	if err != nil {
		httputil.ServeJSONError(rw, err)
		return
	}

	httputil.ReturnJSON(rw, &SignerAttrValueResponse{
		Permanode: pn,
		Meta:      metaMap,
	})
}

func (sh *Handler) serveClaims(rw http.ResponseWriter, req *http.Request) {
	defer httputil.RecoverJSON(rw, req)
	var cr ClaimsRequest
	cr.fromHTTP(req)
	res, err := sh.GetClaims(&cr)
	if err != nil {
		httputil.ServeJSONError(rw, err)
		return
	}
	httputil.ReturnJSON(rw, res)
}

// servePermanodesWithAttr uses the indexer to search for the permanodes matching
// the request.
// The valid values for the "attr" key in the request (i.e the only attributes
// for a permanode which are actually indexed as such) are "tag" and "title".
func (sh *Handler) servePermanodesWithAttr(rw http.ResponseWriter, req *http.Request) {
	defer httputil.RecoverJSON(rw, req)
	var wr WithAttrRequest
	wr.fromHTTP(req)
	res, err := sh.GetPermanodesWithAttr(&wr)
	if err != nil {
		httputil.ServeJSONError(rw, err)
		return
	}
	httputil.ReturnJSON(rw, res)
}

func (sh *Handler) serveRecentPermanodes(rw http.ResponseWriter, req *http.Request) {
	defer httputil.RecoverJSON(rw, req)
	var rr RecentRequest
	rr.fromHTTP(req)
	res, err := sh.GetRecentPermanodes(&rr)
	if err != nil {
		httputil.ServeJSONError(rw, err)
		return
	}
	httputil.ReturnJSON(rw, res)
}

// Unlike the index interface's EdgesTo method, the "edgesto" Handler
// here additionally filters out since-deleted permanode edges.
func (sh *Handler) serveEdgesTo(rw http.ResponseWriter, req *http.Request) {
	defer httputil.RecoverJSON(rw, req)
	var er EdgesRequest
	er.fromHTTP(req)
	res, err := sh.EdgesTo(&er)
	if err != nil {
		httputil.ServeJSONError(rw, err)
		return
	}
	httputil.ReturnJSON(rw, res)
}

func (sh *Handler) serveSignerPaths(rw http.ResponseWriter, req *http.Request) {
	defer httputil.RecoverJSON(rw, req)
	var sr SignerPathsRequest
	sr.fromHTTP(req)

	res, err := sh.GetSignerPaths(&sr)
	if err != nil {
		httputil.ServeJSONError(rw, err)
		return
	}
	httputil.ReturnJSON(rw, res)
}

func (sh *Handler) serveDescribe(rw http.ResponseWriter, req *http.Request) {
	defer httputil.RecoverJSON(rw, req)
	var dr DescribeRequest
	dr.fromHTTP(req)

	res, err := sh.Describe(&dr)
	if err != nil {
		httputil.ServeJSONError(rw, err)
		return
	}
	httputil.ReturnJSON(rw, res)
}

func (sh *Handler) serveDescribe(rw http.ResponseWriter, req *http.Request) {
	defer httputil.RecoverJSON(rw, req)
	br := httputil.MustGetBlobRef(req, "blobref")

	dr := sh.NewDescribeRequest()
	dr.Describe(br, 4)
	metaMap, err := dr.metaMapThumbs(thumbnailSize(req))
	if err != nil {
		httputil.ServeJSONError(rw, err)
		return
	}
	httputil.ReturnJSON(rw, &DescribeResponse{metaMap})
}

func (sh *Handler) serveQuery(rw http.ResponseWriter, req *http.Request) {
	defer httputil.RecoverJSON(rw, req)

	var sq SearchQuery
	if err := sq.fromHTTP(req); err != nil {
		httputil.ServeJSONError(rw, err)
		return
	}

	sr, err := sh.Query(&sq)
	if err != nil {
		httputil.ServeJSONError(rw, err)
		return
	}

	httputil.ReturnJSON(rw, sr)
}

func (sh *Handler) serveDescribe(rw http.ResponseWriter, req *http.Request) {
	defer httputil.RecoverJSON(rw, req)
	var dr DescribeRequest
	dr.fromHTTP(req)

	sh.initDescribeRequest(&dr)

	if dr.BlobRef.Valid() {
		dr.Describe(dr.BlobRef, dr.depth())
	}
	for _, br := range dr.BlobRefs {
		dr.Describe(br, dr.depth())
	}

	metaMap, err := dr.metaMapThumbs(thumbnailSize(req))
	if err != nil {
		httputil.ServeJSONError(rw, err)
		return
	}
	httputil.ReturnJSON(rw, &DescribeResponse{metaMap})
}

// Unlike the index interface's EdgesTo method, the "edgesto" Handler
// here additionally filters out since-deleted permanode edges.
func (sh *Handler) serveEdgesTo(rw http.ResponseWriter, req *http.Request) {
	defer httputil.RecoverJSON(rw, req)

	ret := jsonMap()
	toRef := httputil.MustGetBlobRef(req, "blobref")
	toRefStr := toRef.String()
	blobInfo := jsonMap()
	ret[toRefStr] = blobInfo

	jsonEdges := jsonMapList()

	edges, err := sh.index.EdgesTo(toRef, nil)
	if err != nil {
		panic(err)
	}

	type mapOrError struct {
		m   map[string]interface{} // nil if no map
		err error
	}
	resc := make(chan mapOrError)
	verify := func(edge *Edge) {
		fromStr := edge.From.String()
		db, err := sh.NewDescribeRequest().DescribeSync(edge.From)
		if err != nil {
			resc <- mapOrError{err: err}
			return
		}
		found := false
		if db.Permanode != nil {
			for attr, vv := range db.Permanode.Attr {
				if IsBlobReferenceAttribute(attr) {
					for _, v := range vv {
						if v == toRefStr {
							found = true
						}
					}
				}
			}
		}
		var em map[string]interface{}
		if found {
			em = jsonMap()
			em["from"] = fromStr
			em["fromType"] = "permanode"
		}
		resc <- mapOrError{m: em}
	}
	verifying := 0
	for _, edge := range edges {
		if edge.FromType == "permanode" {
			verifying++
			go verify(edge)
			continue
		}
		em := jsonMap()
		em["from"] = edge.From.String()
		em["fromType"] = edge.FromType
		jsonEdges = append(jsonEdges, em)
	}
	for i := 0; i < verifying; i++ {
		res := <-resc
		if res.err != nil {
			panic(res.err) // caught and put in JSON response
		}
		if res.m != nil {
			jsonEdges = append(jsonEdges, res.m)
		}
	}
	blobInfo["edgesTo"] = jsonEdges
	httputil.ReturnJSON(rw, ret)
}