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|
package bindings
import (
"context"
"fmt"
"io"
"net"
"net/http"
"net/url"
"path/filepath"
"strings"
"github.com/containers/libpod/pkg/api/handlers"
jsoniter "github.com/json-iterator/go"
"github.com/pkg/errors"
)
var (
defaultConnectionPath string = filepath.Join(fmt.Sprintf("v%s", handlers.MinimalApiVersion), "libpod")
)
type APIResponse struct {
*http.Response
Request *http.Request
}
type Connection struct {
scheme string
address string
client *http.Client
}
// NewConnection takes a URI as a string and returns a context with the
// Connection embedded as a value. This context needs to be passed to each
// endpoint to work correctly.
//
// A valid URI connection should be scheme://
// For example tcp://localhost:<port>
// or unix://run/podman/podman.sock
func NewConnection(uri string) (context.Context, error) {
u, err := url.Parse(uri)
if err != nil {
return nil, err
}
// TODO once ssh is implemented, remove this block and
// add it to the conditional beneath it
if u.Scheme == "ssh" {
return nil, ErrNotImplemented
}
if u.Scheme != "tcp" && u.Scheme != "unix" {
return nil, errors.Errorf("%s is not a support schema", u.Scheme)
}
if u.Scheme == "tcp" && !strings.HasPrefix(uri, "tcp://") {
return nil, errors.New("tcp URIs should begin with tcp://")
}
address := u.Path
if u.Scheme == "tcp" {
address = u.Host
}
newConn := newConnection(u.Scheme, address)
ctx := context.WithValue(context.Background(), "conn", &newConn)
if err := pingNewConnection(ctx); err != nil {
return nil, err
}
return ctx, nil
}
// pingNewConnection pings to make sure the RESTFUL service is up
// and running. it should only be used where initializing a connection
func pingNewConnection(ctx context.Context) error {
conn, err := GetConnectionFromContext(ctx)
if err != nil {
return err
}
// the ping endpoint sits at / in this case
response, err := conn.DoRequest(nil, http.MethodGet, "../../../_ping", nil)
if err != nil {
return err
}
if response.StatusCode == http.StatusOK {
return nil
}
return errors.Errorf("ping response was %q", response.StatusCode)
}
// newConnection takes a scheme and address and creates a connection from it
func newConnection(scheme, address string) Connection {
client := http.Client{
Transport: &http.Transport{
DialContext: func(_ context.Context, _, _ string) (net.Conn, error) {
return net.Dial(scheme, address)
},
},
}
newConn := Connection{
client: &client,
address: address,
scheme: scheme,
}
return newConn
}
func (c *Connection) makeEndpoint(u string) string {
// The d character in the url is discarded and is meaningless
return fmt.Sprintf("http://d/%s%s", defaultConnectionPath, u)
}
// DoRequest assembles the http request and returns the response
func (c *Connection) DoRequest(httpBody io.Reader, httpMethod, endpoint string, queryParams map[string]string, pathValues ...string) (*APIResponse, error) {
var (
err error
response *http.Response
)
safePathValues := make([]interface{}, len(pathValues))
// Make sure path values are http url safe
for i, pv := range pathValues {
safePathValues[i] = url.PathEscape(pv)
}
// Lets eventually use URL for this which might lead to safer
// usage
safeEndpoint := fmt.Sprintf(endpoint, safePathValues...)
e := c.makeEndpoint(safeEndpoint)
req, err := http.NewRequest(httpMethod, e, httpBody)
if err != nil {
return nil, err
}
if len(queryParams) > 0 {
// if more desirable we could use url to form the encoded endpoint with params
r := req.URL.Query()
for k, v := range queryParams {
r.Add(k, v)
}
req.URL.RawQuery = r.Encode()
}
// Give the Do three chances in the case of a comm/service hiccup
for i := 0; i < 3; i++ {
response, err = c.client.Do(req) // nolint
if err == nil {
break
}
}
return &APIResponse{response, req}, err
}
// GetConnectionFromContext returns a bindings connection from the context
// being passed into each method.
func GetConnectionFromContext(ctx context.Context) (*Connection, error) {
c := ctx.Value("conn")
if c == nil {
return nil, errors.New("unable to get connection from context")
}
conn := c.(*Connection)
return conn, nil
}
// FiltersToString converts our typical filter format of a
// map[string][]string to a query/html safe string.
func FiltersToString(filters map[string][]string) (string, error) {
lowerCaseKeys := make(map[string][]string)
for k, v := range filters {
lowerCaseKeys[strings.ToLower(k)] = v
}
return jsoniter.MarshalToString(lowerCaseKeys)
}
// IsInformation returns true if the response code is 1xx
func (h *APIResponse) IsInformational() bool {
return h.Response.StatusCode/100 == 1
}
// IsSuccess returns true if the response code is 2xx
func (h *APIResponse) IsSuccess() bool {
return h.Response.StatusCode/100 == 2
}
// IsRedirection returns true if the response code is 3xx
func (h *APIResponse) IsRedirection() bool {
return h.Response.StatusCode/100 == 3
}
// IsClientError returns true if the response code is 4xx
func (h *APIResponse) IsClientError() bool {
return h.Response.StatusCode/100 == 4
}
// IsServerError returns true if the response code is 5xx
func (h *APIResponse) IsServerError() bool {
return h.Response.StatusCode/100 == 5
}
|
