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petstore.go
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petstore.go
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// Copyright 2019 DeepMap, Inc.
//
// 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.
//go:generate go run github.com/deepmap/oapi-codegen/cmd/oapi-codegen --config=types.cfg.yaml ../../petstore-expanded.yaml
//go:generate go run github.com/deepmap/oapi-codegen/cmd/oapi-codegen --config=server.cfg.yaml ../../petstore-expanded.yaml
package api
import (
"fmt"
"net/http"
"sync"
"github.com/gin-gonic/gin"
)
type PetStore struct {
Pets map[int64]Pet
NextId int64
Lock sync.Mutex
}
func NewPetStore() *PetStore {
return &PetStore{
Pets: make(map[int64]Pet),
NextId: 1000,
}
}
// This function wraps sending of an error in the Error format, and
// handling the failure to marshal that.
func sendPetStoreError(c *gin.Context, code int, message string) {
petErr := Error{
Code: int32(code),
Message: message,
}
c.JSON(code, petErr)
}
// FindPets implements all the handlers in the ServerInterface
func (p *PetStore) FindPets(c *gin.Context, params FindPetsParams) {
p.Lock.Lock()
defer p.Lock.Unlock()
var result []Pet
for _, pet := range p.Pets {
if params.Tags != nil {
// If we have tags, filter pets by tag
for _, t := range *params.Tags {
if pet.Tag != nil && (*pet.Tag == t) {
result = append(result, pet)
}
}
} else {
// Add all pets if we're not filtering
result = append(result, pet)
}
if params.Limit != nil {
l := int(*params.Limit)
if len(result) >= l {
// We're at the limit
break
}
}
}
c.JSON(http.StatusOK, result)
}
func (p *PetStore) AddPet(c *gin.Context) {
// We expect a NewPet object in the request body.
var newPet NewPet
err := c.Bind(&newPet)
if err != nil {
sendPetStoreError(c, http.StatusBadRequest, "Invalid format for NewPet")
return
}
// We now have a pet, let's add it to our "database".
// We're always asynchronous, so lock unsafe operations below
p.Lock.Lock()
defer p.Lock.Unlock()
// We handle pets, not NewPets, which have an additional ID field
var pet Pet
pet.Name = newPet.Name
pet.Tag = newPet.Tag
pet.Id = p.NextId
p.NextId = p.NextId + 1
// Insert into map
p.Pets[pet.Id] = pet
// Now, we have to return the NewPet
c.JSON(http.StatusCreated, pet)
return
}
func (p *PetStore) FindPetByID(c *gin.Context, petId int64) {
p.Lock.Lock()
defer p.Lock.Unlock()
pet, found := p.Pets[petId]
if !found {
sendPetStoreError(c, http.StatusNotFound, fmt.Sprintf("Could not find pet with ID %d", petId))
return
}
c.JSON(http.StatusOK, pet)
}
func (p *PetStore) DeletePet(c *gin.Context, id int64) {
p.Lock.Lock()
defer p.Lock.Unlock()
_, found := p.Pets[id]
if !found {
sendPetStoreError(c, http.StatusNotFound, fmt.Sprintf("Could not find pet with ID %d", id))
}
delete(p.Pets, id)
c.Status(http.StatusNoContent)
}