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/******************************************************************************
*
* Copyright 2018 Stefan Majewsky <majewsky@gmx.net>
*
* 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 schwift
import (
"net/http"
)
//Container represents a Swift container.
type Container struct {
a *Account
name string
//cache
headers *ContainerHeaders
}
//Container returns a handle to the container with the given name within this
//account. This function does not issue any HTTP requests, and therefore cannot
//ensure that the container exists. Use the Exists() function to check for the
//container's existence, or chain this function with the EnsureExists()
//function like so:
//
// container, err := account.Container("documents").EnsureExists()
func (a *Account) Container(name string) *Container {
return &Container{a: a, name: name}
}
//Account returns a handle to the account this container is stored in.
func (c *Container) Account() *Account {
return c.a
}
//Name returns the container name.
func (c *Container) Name() string {
return c.name
}
//Exists checks if this container exists, potentially by issuing a HEAD request
//if no Headers() have been cached yet.
func (c *Container) Exists() (bool, error) {
_, err := c.Headers()
if Is(err, http.StatusNotFound) {
return false, nil
} else if err != nil {
return false, err
}
return true, nil
}
//Headers returns the ContainerHeaders for this account. If the ContainerHeaders
//has not been cached yet, a HEAD request is issued on the account.
func (c *Container) Headers() (ContainerHeaders, error) {
if c.headers != nil {
return *c.headers, nil
}
resp, err := Request{
Method: "HEAD",
ContainerName: c.name,
ExpectStatusCodes: []int{204},
}.Do(c.a.client)
if err != nil {
return ContainerHeaders{}, err
}
headers := ContainerHeaders(headersFromHTTP(resp.Header))
err = headers.Validate()
if err != nil {
return headers, err
}
c.headers = &headers
return *c.headers, nil
}
//Update updates the container using a POST request. To add URL parameters, pass
//a non-nil *RequestOptions.
//
//If you are not sure whether the container exists, use Create() instead.
//
//A successful POST request implies Invalidate() since it may change metadata.
func (c *Container) Update(headers ContainerHeaders, opts *RequestOptions) error {
_, err := Request{
Method: "POST",
ContainerName: c.name,
Headers: headersToHTTP(headers),
Options: opts,
ExpectStatusCodes: []int{204},
}.Do(c.a.client)
if err == nil {
c.Invalidate()
}
return err
}
//Create creates the container using a PUT request. To add URL parameters, pass
//a non-nil *RequestOptions.
//
//This function can be used regardless of whether the container exists or not.
//
//A successful PUT request implies Invalidate() since it may change metadata.
func (c *Container) Create(headers ContainerHeaders, opts *RequestOptions) error {
_, err := Request{
Method: "PUT",
ContainerName: c.name,
Headers: headersToHTTP(headers),
Options: opts,
ExpectStatusCodes: []int{201, 202},
}.Do(c.a.client)
if err == nil {
c.Invalidate()
}
return err
}
//Delete deletes the container using a DELETE request. To add URL parameters,
//pass a non-nil *RequestOptions.
//
//This operation fails with http.StatusConflict if the container is not empty.
//
//This operation fails with http.StatusNotFound if the container does not exist.
//
//A successful DELETE request implies Invalidate().
func (c *Container) Delete(headers ContainerHeaders, opts *RequestOptions) error {
_, err := Request{
Method: "DELETE",
ContainerName: c.name,
Headers: headersToHTTP(headers),
Options: opts,
ExpectStatusCodes: []int{204},
}.Do(c.a.client)
if err == nil {
c.Invalidate()
}
return err
}
//Invalidate clears the internal cache of this Container instance. The next call
//to Headers() on this instance will issue a HEAD request on the account.
func (c *Container) Invalidate() {
c.headers = nil
}
//EnsureExists issues a PUT request on this container.
//If the container does not exist yet, it will be created by this call.
//If the container exists already, this call does not change it.
//This function returns the same container again, because its intended use is
//with freshly constructed Container instances like so:
//
// container, err := account.Container("documents").EnsureExists()
func (c *Container) EnsureExists() (*Container, error) {
_, err := Request{
Method: "PUT",
ContainerName: c.name,
ExpectStatusCodes: []int{201, 202},
}.Do(c.a.client)
return c, err
}
// TODO object listing
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