github.com/rohankumardubey/aresdb@v0.0.2-0.20190517170215-e54e3ca06b9c/api/enum_handler.go (about)

     1  //  Copyright (c) 2017-2018 Uber Technologies, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package api
    16  
    17  import (
    18  	"encoding/json"
    19  	"github.com/gorilla/mux"
    20  	"github.com/uber/aresdb/memstore"
    21  	"github.com/uber/aresdb/metastore"
    22  	"github.com/uber/aresdb/utils"
    23  	"net/http"
    24  )
    25  
    26  // EnumHandler handlers enum rw
    27  type EnumHandler struct {
    28  	memStore  memstore.MemStore
    29  	metastore metastore.MetaStore
    30  }
    31  
    32  // NewEnumHandler returns a new enum handler
    33  func NewEnumHandler(memStore memstore.MemStore, metastore metastore.MetaStore) *EnumHandler {
    34  	return &EnumHandler{
    35  		memStore:  memStore,
    36  		metastore: metastore,
    37  	}
    38  }
    39  
    40  // Register regists paths
    41  func (handler *EnumHandler) Register(router *mux.Router, wrappers ...utils.HTTPHandlerWrapper) {
    42  	router.HandleFunc("/tables/{table}/columns/{column}/enum-cases", utils.ApplyHTTPWrappers(handler.ListEnumCases, wrappers)).Methods(http.MethodGet)
    43  	router.HandleFunc("/tables/{table}/columns/{column}/enum-cases", utils.ApplyHTTPWrappers(handler.AddEnumCase, wrappers)).Methods(http.MethodPost)
    44  }
    45  
    46  // ListEnumCases swagger:route GET /schema/tables/{table}/columns/{column}/enum-cases listEnumCases
    47  // list existing enumCases for given table and column
    48  //
    49  // Responses:
    50  //    default: errorResponse
    51  //        200: listEnumCasesResponse
    52  func (handler *EnumHandler) ListEnumCases(w http.ResponseWriter, r *http.Request) {
    53  	var listEnumCasesRequest ListEnumCasesRequest
    54  	var listEnumCasesResponse ListEnumCasesResponse
    55  
    56  	err := ReadRequest(r, &listEnumCasesRequest)
    57  	if err != nil {
    58  		RespondWithError(w, err)
    59  		return
    60  	}
    61  
    62  	tableSchema, err := handler.memStore.GetSchema(listEnumCasesRequest.TableName)
    63  	if err != nil {
    64  		RespondWithError(w, ErrTableDoesNotExist)
    65  		return
    66  	}
    67  
    68  	tableSchema.RLock()
    69  	enumDict, columnExist := tableSchema.EnumDicts[listEnumCasesRequest.ColumnName]
    70  	if !columnExist {
    71  		tableSchema.RUnlock()
    72  		RespondWithError(w, ErrColumnDoesNotExist)
    73  		return
    74  	}
    75  
    76  	listEnumCasesResponse.JSONBuffer, err = json.Marshal(enumDict.ReverseDict)
    77  	tableSchema.RUnlock()
    78  
    79  	RespondWithJSONBytes(w, listEnumCasesResponse.JSONBuffer, err)
    80  }
    81  
    82  // AddEnumCase swagger:route POST /schema/tables/{table}/columns/{column}/enum-cases addEnumCase
    83  // add an enum case to given column of given table
    84  // return the id of the enum
    85  //
    86  // Responses:
    87  //    default: errorResponse
    88  //        200: addEnumCaseResponse
    89  func (handler *EnumHandler) AddEnumCase(w http.ResponseWriter, r *http.Request) {
    90  	var addEnumCaseRequest AddEnumCaseRequest
    91  	var addEnumCaseResponse AddEnumCaseResponse
    92  
    93  	err := ReadRequest(r, &addEnumCaseRequest)
    94  	if err != nil {
    95  		RespondWithError(w, err)
    96  		return
    97  	}
    98  
    99  	addEnumCaseResponse.Body, err = handler.metastore.ExtendEnumDict(addEnumCaseRequest.TableName, addEnumCaseRequest.ColumnName, addEnumCaseRequest.Body.EnumCases)
   100  	if err != nil {
   101  		// TODO: need mapping from metaStore error to api error
   102  		// for metaStore error might also be user error
   103  		RespondWithError(w, err)
   104  		return
   105  	}
   106  
   107  	RespondWithJSONObject(w, addEnumCaseResponse.Body)
   108  }