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|
package docker
import (
"encoding/json"
"net/http"
"github.com/go-chi/chi/v5"
"github.com/rclone/rclone/fs"
)
const (
contentType = "application/vnd.docker.plugins.v1.1+json"
activatePath = "/Plugin.Activate"
createPath = "/VolumeDriver.Create"
getPath = "/VolumeDriver.Get"
listPath = "/VolumeDriver.List"
removePath = "/VolumeDriver.Remove"
pathPath = "/VolumeDriver.Path"
mountPath = "/VolumeDriver.Mount"
unmountPath = "/VolumeDriver.Unmount"
capsPath = "/VolumeDriver.Capabilities"
)
// CreateRequest is the structure that docker's requests are deserialized to.
type CreateRequest struct {
Name string
Options map[string]string `json:"Opts,omitempty"`
}
// RemoveRequest structure for a volume remove request
type RemoveRequest struct {
Name string
}
// MountRequest structure for a volume mount request
type MountRequest struct {
Name string
ID string
}
// MountResponse structure for a volume mount response
type MountResponse struct {
Mountpoint string
}
// UnmountRequest structure for a volume unmount request
type UnmountRequest struct {
Name string
ID string
}
// PathRequest structure for a volume path request
type PathRequest struct {
Name string
}
// PathResponse structure for a volume path response
type PathResponse struct {
Mountpoint string
}
// GetRequest structure for a volume get request
type GetRequest struct {
Name string
}
// GetResponse structure for a volume get response
type GetResponse struct {
Volume *VolInfo
}
// ListResponse structure for a volume list response
type ListResponse struct {
Volumes []*VolInfo
}
// CapabilitiesResponse structure for a volume capability response
type CapabilitiesResponse struct {
Capabilities Capability
}
// Capability represents the list of capabilities a volume driver can return
type Capability struct {
Scope string
}
// ErrorResponse is a formatted error message that docker can understand
type ErrorResponse struct {
Err string
}
func newRouter(drv *Driver) http.Handler {
r := chi.NewRouter()
r.Post(activatePath, func(w http.ResponseWriter, r *http.Request) {
res := map[string]interface{}{
"Implements": []string{"VolumeDriver"},
}
encodeResponse(w, res, nil, activatePath)
})
r.Post(createPath, func(w http.ResponseWriter, r *http.Request) {
var req CreateRequest
if decodeRequest(w, r, &req) {
err := drv.Create(&req)
encodeResponse(w, nil, err, createPath)
}
})
r.Post(removePath, func(w http.ResponseWriter, r *http.Request) {
var req RemoveRequest
if decodeRequest(w, r, &req) {
err := drv.Remove(&req)
encodeResponse(w, nil, err, removePath)
}
})
r.Post(mountPath, func(w http.ResponseWriter, r *http.Request) {
var req MountRequest
if decodeRequest(w, r, &req) {
res, err := drv.Mount(&req)
encodeResponse(w, res, err, mountPath)
}
})
r.Post(pathPath, func(w http.ResponseWriter, r *http.Request) {
var req PathRequest
if decodeRequest(w, r, &req) {
res, err := drv.Path(&req)
encodeResponse(w, res, err, pathPath)
}
})
r.Post(getPath, func(w http.ResponseWriter, r *http.Request) {
var req GetRequest
if decodeRequest(w, r, &req) {
res, err := drv.Get(&req)
encodeResponse(w, res, err, getPath)
}
})
r.Post(unmountPath, func(w http.ResponseWriter, r *http.Request) {
var req UnmountRequest
if decodeRequest(w, r, &req) {
err := drv.Unmount(&req)
encodeResponse(w, nil, err, unmountPath)
}
})
r.Post(listPath, func(w http.ResponseWriter, r *http.Request) {
res, err := drv.List()
encodeResponse(w, res, err, listPath)
})
r.Post(capsPath, func(w http.ResponseWriter, r *http.Request) {
res := &CapabilitiesResponse{
Capabilities: Capability{Scope: pluginScope},
}
encodeResponse(w, res, nil, capsPath)
})
return r
}
func decodeRequest(w http.ResponseWriter, r *http.Request, req interface{}) bool {
if err := json.NewDecoder(r.Body).Decode(req); err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return false
}
return true
}
func encodeResponse(w http.ResponseWriter, res interface{}, err error, path string) {
w.Header().Set("Content-Type", contentType)
if err != nil {
fs.Debugf(path, "Request returned error: %v", err)
w.WriteHeader(http.StatusInternalServerError)
res = &ErrorResponse{Err: err.Error()}
} else if res == nil {
res = struct{}{}
}
if err = json.NewEncoder(w).Encode(res); err != nil {
fs.Debugf(path, "Response encoding failed: %v", err)
}
}
|
