126 lines
2.9 KiB
Go
126 lines
2.9 KiB
Go
// Copyright (c) Mainflux
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// SPDX-License-Identifier: Apache-2.0
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package api
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import (
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"context"
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"encoding/json"
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"net/http"
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kithttp "github.com/go-kit/kit/transport/http"
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"github.com/go-zoo/bone"
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"github.com/mainflux/mainflux"
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"github.com/mainflux/mainflux/internal/apiutil"
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mflog "github.com/mainflux/mainflux/logger"
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"github.com/mainflux/mainflux/opcua"
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"github.com/mainflux/mainflux/pkg/errors"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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)
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const (
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contentType = "application/json"
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serverParam = "server"
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namespaceParam = "namespace"
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identifierParam = "identifier"
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defNamespace = "ns=0" // Standard root namespace
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defIdentifier = "i=84" // Standard root identifier
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)
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// MakeHandler returns a HTTP handler for API endpoints.
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func MakeHandler(svc opcua.Service, logger mflog.Logger, instanceID string) http.Handler {
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opts := []kithttp.ServerOption{
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kithttp.ServerErrorEncoder(apiutil.LoggingErrorEncoder(logger, encodeError)),
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}
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r := bone.New()
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r.Get("/browse", kithttp.NewServer(
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browseEndpoint(svc),
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decodeBrowse,
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encodeResponse,
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opts...,
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))
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r.GetFunc("/health", mainflux.Health("opcua-adapter", instanceID))
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r.Handle("/metrics", promhttp.Handler())
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return r
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}
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func decodeBrowse(_ context.Context, r *http.Request) (interface{}, error) {
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s, err := apiutil.ReadStringQuery(r, serverParam, "")
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if err != nil {
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return nil, errors.Wrap(apiutil.ErrValidation, err)
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}
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n, err := apiutil.ReadStringQuery(r, namespaceParam, "")
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if err != nil {
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return nil, errors.Wrap(apiutil.ErrValidation, err)
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}
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i, err := apiutil.ReadStringQuery(r, identifierParam, "")
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if err != nil {
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return nil, errors.Wrap(apiutil.ErrValidation, err)
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}
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if n == "" || i == "" {
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n = defNamespace
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i = defIdentifier
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}
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req := browseReq{
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ServerURI: s,
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Namespace: n,
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Identifier: i,
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}
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return req, nil
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}
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func encodeResponse(_ context.Context, w http.ResponseWriter, response interface{}) error {
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w.Header().Set("Content-Type", contentType)
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if ar, ok := response.(mainflux.Response); ok {
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for k, v := range ar.Headers() {
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w.Header().Set(k, v)
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}
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w.WriteHeader(ar.Code())
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if ar.Empty() {
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return nil
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}
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}
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return json.NewEncoder(w).Encode(response)
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}
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func encodeError(_ context.Context, err error, w http.ResponseWriter) {
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var wrapper error
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if errors.Contains(err, apiutil.ErrValidation) {
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wrapper, err = errors.Unwrap(err)
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}
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switch {
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case errors.Contains(err, apiutil.ErrInvalidQueryParams),
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errors.Contains(err, errors.ErrMalformedEntity),
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err == apiutil.ErrMissingID:
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w.WriteHeader(http.StatusBadRequest)
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default:
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w.WriteHeader(http.StatusInternalServerError)
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}
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if wrapper != nil {
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err = errors.Wrap(wrapper, err)
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}
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if errorVal, ok := err.(errors.Error); ok {
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w.Header().Set("Content-Type", contentType)
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if err := json.NewEncoder(w).Encode(errorVal); err != nil {
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w.WriteHeader(http.StatusInternalServerError)
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}
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}
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}
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