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client.go
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client.go
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// Copyright 2023 The ClusterLink 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 rest
import (
"encoding/json"
"fmt"
"net/http"
"reflect"
"github.com/clusterlink-net/clusterlink/pkg/util/jsonapi"
)
// Config specifies a client configuration.
type Config struct {
// Client is the underlying HTTP client.
Client *jsonapi.Client
// BasePath is the server HTTP path for manipulating a specific type of objects.
BasePath string
// SampleObject is an instance representing the type returned when getting an object.
SampleObject any
// SampleList is an instance representing the type returned when listing objects.
SampleList any
}
// Client for issuing REST-JSON requests for a specific type of objects.
type Client struct {
client *jsonapi.Client
basePath string
objectType reflect.Type
listType reflect.Type
}
// Create an object.
func (c *Client) Create(object any) error {
encoded, err := json.Marshal(object)
if err != nil {
return fmt.Errorf("unable to encode object: %w", err)
}
resp, err := c.client.Post(c.basePath, encoded)
if err != nil {
return fmt.Errorf("unable to create object: %w", err)
}
if resp.Status != http.StatusCreated {
return fmt.Errorf("unable to create object (%d), server returned: %s",
resp.Status, resp.Body)
}
return nil
}
// Update an object.
func (c *Client) Update(object any) error {
encoded, err := json.Marshal(object)
if err != nil {
return fmt.Errorf("unable to encode object: %w", err)
}
resp, err := c.client.Put(c.basePath, encoded)
if err != nil {
return fmt.Errorf("unable to update object: %w", err)
}
if resp.Status != http.StatusNoContent {
return fmt.Errorf("unable to update object (%d), server returned: %s",
resp.Status, resp.Body)
}
return nil
}
// Get an object.
func (c *Client) Get(name string) (any, error) {
resp, err := c.client.Get(c.basePath + "/" + name)
if err != nil {
return nil, fmt.Errorf("unable to get object: %w", err)
}
if resp.Status != http.StatusOK {
return nil, fmt.Errorf("unable to get object (%d), server returned: %s",
resp.Status, resp.Body)
}
decoded := reflect.New(c.objectType).Interface()
if err := json.Unmarshal(resp.Body, decoded); err != nil {
return nil, fmt.Errorf("unable to decode object %v: %w", decoded, err)
}
return decoded, nil
}
// Delete an object, either by name or the object itself.
func (c *Client) Delete(object any) error {
var body []byte
path := c.basePath
if name, ok := object.(string); ok {
// delete by name
path = path + "/" + name
} else {
// delete by object
encoded, err := json.Marshal(object)
if err != nil {
return fmt.Errorf("cannot encode object: %w", err)
}
body = encoded
}
resp, err := c.client.Delete(path, body)
if err != nil {
return fmt.Errorf("unable to delete object: %w", err)
}
if resp.Status != http.StatusNoContent {
return fmt.Errorf("unable to delete object (%d), server returned: %s",
resp.Status, resp.Body)
}
return nil
}
// List all objects.
func (c *Client) List() (any, error) {
resp, err := c.client.Get(c.basePath)
if err != nil {
return nil, fmt.Errorf("unable to list objects: %w", err)
}
if resp.Status != http.StatusOK {
return nil, fmt.Errorf("unable to list objects (%d), server returned: %s",
resp.Status, resp.Body)
}
decoded := reflect.New(c.listType).Interface()
if err := json.Unmarshal(resp.Body, decoded); err != nil {
return nil, fmt.Errorf("unable to decode object list %v: %w", decoded, err)
}
return decoded, nil
}
// NewClient returns a new REST-JSON client.
func NewClient(config *Config) *Client {
return &Client{
client: config.Client,
basePath: config.BasePath,
objectType: reflect.TypeOf(config.SampleObject),
listType: reflect.TypeOf(config.SampleList),
}
}