Merge branch '10538-trash-delete' closes #10538

[arvados.git] / sdk / go / arvados / client.go

diff --git a/sdk/go/arvados/client.go b/sdk/go/arvados/client.go
index 36f4eb52ae298982dfa09ddf82b0cea08c2604f7..fc937494e5a679728aea021dbe80a95231582d72 100644 (file)
--- a/sdk/go/arvados/client.go
+++ b/sdk/go/arvados/client.go
@@ -41,6 +41,8 @@ type Client struct {
        // callers who use a Client to initialize an
        // arvadosclient.ArvadosClient.)
        KeepServiceURIs []string `json:",omitempty"`
+
+       dd *DiscoveryDocument
 }
 
 // The default http.Client used by a Client with Insecure==true and
@@ -198,14 +200,103 @@ func (c *Client) apiURL(path string) string {
 
 // DiscoveryDocument is the Arvados server's description of itself.
 type DiscoveryDocument struct {
-       DefaultCollectionReplication int   `json:"defaultCollectionReplication"`
-       BlobSignatureTTL             int64 `json:"blobSignatureTtl"`
+       BasePath                     string              `json:"basePath"`
+       DefaultCollectionReplication int                 `json:"defaultCollectionReplication"`
+       BlobSignatureTTL             int64               `json:"blobSignatureTtl"`
+       Schemas                      map[string]Schema   `json:"schemas"`
+       Resources                    map[string]Resource `json:"resources"`
+}
+
+type Resource struct {
+       Methods map[string]ResourceMethod `json:"methods"`
+}
+
+type ResourceMethod struct {
+       HTTPMethod string         `json:"httpMethod"`
+       Path       string         `json:"path"`
+       Response   MethodResponse `json:"response"`
+}
+
+type MethodResponse struct {
+       Ref string `json:"$ref"`
+}
+
+type Schema struct {
+       UUIDPrefix string `json:"uuidPrefix"`
 }
 
 // DiscoveryDocument returns a *DiscoveryDocument. The returned object
 // should not be modified: the same object may be returned by
 // subsequent calls.
 func (c *Client) DiscoveryDocument() (*DiscoveryDocument, error) {
+       if c.dd != nil {
+               return c.dd, nil
+       }
        var dd DiscoveryDocument
-       return &dd, c.RequestAndDecode(&dd, "GET", "discovery/v1/apis/arvados/v1/rest", nil, nil)
+       err := c.RequestAndDecode(&dd, "GET", "discovery/v1/apis/arvados/v1/rest", nil, nil)
+       if err != nil {
+               return nil, err
+       }
+       c.dd = &dd
+       return c.dd, nil
+}
+
+func (c *Client) modelForUUID(dd *DiscoveryDocument, uuid string) (string, error) {
+       if len(uuid) != 27 {
+               return "", fmt.Errorf("invalid UUID: %q", uuid)
+       }
+       infix := uuid[6:11]
+       var model string
+       for m, s := range dd.Schemas {
+               if s.UUIDPrefix == infix {
+                       model = m
+                       break
+               }
+       }
+       if model == "" {
+               return "", fmt.Errorf("unrecognized type portion %q in UUID %q", infix, uuid)
+       }
+       return model, nil
+}
+
+func (c *Client) KindForUUID(uuid string) (string, error) {
+       dd, err := c.DiscoveryDocument()
+       if err != nil {
+               return "", err
+       }
+       model, err := c.modelForUUID(dd, uuid)
+       if err != nil {
+               return "", err
+       }
+       return "arvados#" + strings.ToLower(model[:1]) + model[1:], nil
+}
+
+func (c *Client) PathForUUID(method, uuid string) (string, error) {
+       dd, err := c.DiscoveryDocument()
+       if err != nil {
+               return "", err
+       }
+       model, err := c.modelForUUID(dd, uuid)
+       if err != nil {
+               return "", err
+       }
+       var resource string
+       for r, rsc := range dd.Resources {
+               if rsc.Methods["get"].Response.Ref == model {
+                       resource = r
+                       break
+               }
+       }
+       if resource == "" {
+               return "", fmt.Errorf("no resource for model: %q", model)
+       }
+       m, ok := dd.Resources[resource].Methods[method]
+       if !ok {
+               return "", fmt.Errorf("no method %q for resource %q", method, resource)
+       }
+       path := dd.BasePath + strings.Replace(m.Path, "{uuid}", uuid, -1)
+       if path[0] == '/' {
+               path = path[1:]
+       }
+       return path, nil
 }