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query.go
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query.go
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// Copyright (c) 2017 - The Event Horizon authors.
//
// 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 httputils
import (
"encoding/json"
"fmt"
"net/http"
"path"
eh "github.com/firawe/eventhorizon"
)
// QueryHandler returns one or all items from a eventhorizon.ReadRepo. If the
// URL ends with a / it will return all items, otherwise it will try to use the
// last part of the path as an ID to return one item.
func QueryHandler(repo eh.ReadRepo) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.Method != "GET" {
http.Error(w, "unsuported method: "+r.Method, http.StatusMethodNotAllowed)
return
}
ctx := eh.NewContextWithNamespaceAndType(r.Context(), "test_handler", "test_type")
var (
data interface{}
err error
)
// If there is a trailing slash in the URL we return all items,
// otherwise we try to parse an ID from the last part to return one item.
_, idStr := path.Split(r.URL.Path)
if idStr == "" {
fmt.Println("data: ",data)
if data, err = repo.FindAll(ctx); err != nil {
http.Error(w, "could not find items: "+err.Error(), http.StatusInternalServerError)
return
}
} else {
//id, err := uuid.Parse(idStr)
//if err != nil {
// http.Error(w, "could not parse ID: "+err.Error(), http.StatusBadRequest)
// return
//}
fmt.Println("data: ",data)
if data, err = repo.Find(ctx, idStr); err != nil {
if rrErr, ok := err.(eh.RepoError); ok && rrErr.Err == eh.ErrEntityNotFound {
http.Error(w, "could not find item", http.StatusNotFound)
return
}
http.Error(w, "could not find item: "+err.Error(), http.StatusInternalServerError)
return
}
}
b, err := json.Marshal(data)
if err != nil {
http.Error(w, "could not encode result: "+err.Error(), http.StatusInternalServerError)
return
}
w.Write(b)
})
}