X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/2204a8d9305c85d2f7d65621a66443e7104c5f6b..093ec98e4a065acfc537ea22c08c337c115fe273:/sdk/R/R/ArvadosFile.R

diff --git a/sdk/R/R/ArvadosFile.R b/sdk/R/R/ArvadosFile.R
index ce3a6fff59..fb1d3b335c 100644
--- a/sdk/R/R/ArvadosFile.R
+++ b/sdk/R/R/ArvadosFile.R
@@ -1,65 +1,309 @@
-#' ArvadosFile Object
+# Copyright (C) The Arvados Authors. All rights reserved.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+#' ArvadosFile
+#'
+#' ArvadosFile class represents a file inside Arvados collection.
+#'
+#' @section Usage:
+#' \preformatted{file = ArvadosFile$new(name)}
+#'
+#' @section Arguments:
+#' \describe{
+#'   \item{name}{Name of the file.}
+#' }
+#'
+#' @section Methods:
+#' \describe{
+#'   \item{getName()}{Returns name of the file.}
+#'   \item{getRelativePath()}{Returns file path relative to the root.}
+#'   \item{read(contentType = "raw", offset = 0, length = 0)}{Read file content.}
+#'   \item{write(content, contentType = "text/html")}{Write to file (override current content of the file).}
+#'   \item{connection(rw)}{Get connection opened in "read" or "write" mode.}
+#'   \item{flush()}{Write connections content to a file (override current content of the file).}
+#'   \item{remove(name)}{Removes ArvadosFile or Subcollection specified by name from the subcollection.}
+#'   \item{getSizeInBytes()}{Returns file size in bytes.}
+#'   \item{move(destination)}{Moves file to a new location inside collection.}
+#'   \item{copy(destination)}{Copies file to a new location inside collection.}
+#' }
+#'
+#' @name ArvadosFile
+#' @examples
+#' \dontrun{
+#' myFile <- ArvadosFile$new("myFile")
 #'
-#' Update description
+#' myFile$write("This is new file content")
+#' fileContent <- myFile$read()
+#' fileContent <- myFile$read("text")
+#' fileContent <- myFile$read("raw", offset = 8, length = 4)
 #'
-#' @export ArvadosFile
+#' #Write a table:
+#' arvConnection <- myFile$connection("w")
+#' write.table(mytable, arvConnection)
+#' arvadosFile$flush()
+#'
+#' #Read a table:
+#' arvConnection <- myFile$connection("r")
+#' mytable <- read.table(arvConnection)
+#'
+#' myFile$move("newFolder/myFile")
+#' myFile$copy("newFolder/myFile")
+#' }
+NULL
+
+#' @export
 ArvadosFile <- R6::R6Class(
 
     "ArvadosFile",
 
     public = list(
 
-        initialize = function(name, relativePath, size, api, collection)
+        initialize = function(name)
         {
-            private$name         <- name
-            private$size         <- size
-            private$relativePath <- relativePath
-            private$api          <- api
-            private$collection   <- collection
-            private$http         <- HttpRequest$new()
-            private$httpParser   <- HttpParser$new()
+            if(name == "")
+                stop("Invalid name.")
+
+            private$name <- name
         },
 
         getName = function() private$name,
 
-        getRelativePath = function() private$relativePath,
+        getFileListing = function(fullpath = TRUE)
+        {
+            self$getName()
+        },
+
+        getSizeInBytes = function()
+        {
+            if(is.null(private$collection))
+                return(0)
+
+            REST <- private$collection$getRESTService()
+
+            fileSize <- REST$getResourceSize(self$getRelativePath(),
+                                             private$collection$uuid)
+            fileSize
+        },
 
-        getSizeInBytes = function() private$size,
+        get = function(fileLikeObjectName)
+        {
+            return(NULL)
+        },
 
-        read = function(offset = 0, length = 0)
+        getFirst = function()
         {
+            return(NULL)
+        },
+
+        getCollection = function() private$collection,
+
+        setCollection = function(collection, setRecursively = TRUE)
+        {
+            private$collection <- collection
+        },
+
+        getRelativePath = function()
+        {
+            relativePath <- c(private$name)
+            parent <- private$parent
+
+            while(!is.null(parent))
+            {
+                relativePath <- c(parent$getName(), relativePath)
+                parent <- parent$getParent()
+            }
+
+            relativePath <- relativePath[relativePath != ""]
+            paste0(relativePath, collapse = "/")
+        },
+
+        getParent = function() private$parent,
+
+        setParent = function(newParent) private$parent <- newParent,
+
+        read = function(contentType = "raw", offset = 0, length = 0)
+        {
+            if(is.null(private$collection))
+                stop("ArvadosFile doesn't belong to any collection.")
+
             if(offset < 0 || length < 0)
-            stop("Offset and length must be positive values.")
+                stop("Offset and length must be positive values.")
+
+            REST <- private$collection$getRESTService()
+
+            fileContent <- REST$read(self$getRelativePath(),
+                                     private$collection$uuid,
+                                     contentType, offset, length)
+            fileContent
+        },
+
+        connection = function(rw)
+        {
+            if (rw == "r" || rw == "rb")
+            {
+                REST <- private$collection$getRESTService()
+                return(REST$getConnection(self$getRelativePath(),
+                                          private$collection$uuid,
+                                          rw))
+            }
+            else if (rw == "w")
+            {
+                private$buffer <- textConnection(NULL, "w")
+
+                return(private$buffer)
+            }
+        },
 
-            range = paste0("bytes=", offset, "-")
+        flush = function()
+        {
+            v <- textConnectionValue(private$buffer)
+            close(private$buffer)
+            self$write(paste(v, collapse='\n'))
+        },
+
+        write = function(content, contentType = "text/html")
+        {
+            if(is.null(private$collection))
+                stop("ArvadosFile doesn't belong to any collection.")
+
+            REST <- private$collection$getRESTService()
+
+            writeResult <- REST$write(self$getRelativePath(),
+                                      private$collection$uuid,
+                                      content, contentType)
+            writeResult
+        },
+
+        move = function(destination)
+        {
+            if(is.null(private$collection))
+                stop("ArvadosFile doesn't belong to any collection.")
+
+            destination <- trimFromEnd(destination, "/")
+            nameAndPath <- splitToPathAndName(destination)
+
+            newParent <- private$collection$get(nameAndPath$path)
+
+            if(is.null(newParent))
+                stop("Unable to get destination subcollection.")
+
+            childWithSameName <- newParent$get(nameAndPath$name)
+
+            if(!is.null(childWithSameName))
+                stop("Destination already contains content with same name.")
+
+            REST <- private$collection$getRESTService()
+            REST$move(self$getRelativePath(),
+                      paste0(newParent$getRelativePath(), "/", nameAndPath$name),
+                      private$collection$uuid)
+
+            private$dettachFromCurrentParent()
+            private$attachToNewParent(self, newParent)
+
+            private$parent <- newParent
+            private$name <- nameAndPath$name
+
+            self
+        },
+
+        copy = function(destination)
+        {
+            if(is.null(private$collection))
+                stop("ArvadosFile doesn't belong to any collection.")
 
-            if(length > 0)
-                range = paste0(range, offset + length - 1)
-            
-            fileURL = paste0(private$api$getWebDavHostName(), "c=", private$collection$uuid, "/", private$relativePath);
-            headers <- list(Authorization = paste("OAuth2", private$api$getToken()), 
-                            Range = range)
+            destination <- trimFromEnd(destination, "/")
+            nameAndPath <- splitToPathAndName(destination)
 
-            #TODO(Fudo): Move this to HttpRequest.R
-            # serverResponse <- httr::GET(url = fileURL,
-                                        # config = httr::add_headers(unlist(headers)))
-            serverResponse <- private$http$GET(fileURL, headers)
-            parsed_response <- httr::content(serverResponse, "raw")
+            newParent <- private$collection$get(nameAndPath$path)
 
+            if(is.null(newParent))
+                stop("Unable to get destination subcollection.")
+
+            childWithSameName <- newParent$get(nameAndPath$name)
+
+            if(!is.null(childWithSameName))
+                stop("Destination already contains content with same name.")
+
+            REST <- private$collection$getRESTService()
+            REST$copy(self$getRelativePath(),
+                      paste0(newParent$getRelativePath(), "/", nameAndPath$name),
+                      private$collection$uuid)
+
+            newFile <- self$duplicate(nameAndPath$name)
+            newFile$setCollection(self$getCollection())
+            private$attachToNewParent(newFile, newParent)
+            newFile$setParent(newParent)
+
+            newFile
+        },
+
+        duplicate = function(newName = NULL)
+        {
+            name <- if(!is.null(newName)) newName else private$name
+            newFile <- ArvadosFile$new(name)
+            newFile
         }
     ),
 
     private = list(
 
-        name         = NULL,
-        relativePath = NULL,
-        size         = NULL,
-        parent       = NULL,
-        api          = NULL,
-        collection   = NULL,
-        http         = NULL,
-        httpParser   = NULL
+        name       = NULL,
+        size       = NULL,
+        parent     = NULL,
+        collection = NULL,
+        buffer     = NULL,
+
+        attachToNewParent = function(content, newParent)
+        {
+            # We temporary set parents collection to NULL. This will ensure that
+            # add method doesn't post this file on REST.
+            # We also need to set content's collection to NULL because
+            # add method throws exception if we try to add content that already
+            # belongs to a collection.
+            parentsCollection <- newParent$getCollection()
+            content$setCollection(NULL, setRecursively = FALSE)
+            newParent$setCollection(NULL, setRecursively = FALSE)
+            newParent$add(content)
+            content$setCollection(parentsCollection, setRecursively = FALSE)
+            newParent$setCollection(parentsCollection, setRecursively = FALSE)
+        },
+
+        dettachFromCurrentParent = function()
+        {
+            # We temporary set parents collection to NULL. This will ensure that
+            # remove method doesn't remove this file from REST.
+            parent <- private$parent
+            parentsCollection <- parent$getCollection()
+            parent$setCollection(NULL, setRecursively = FALSE)
+            parent$remove(private$name)
+            parent$setCollection(parentsCollection, setRecursively = FALSE)
+        }
     ),
-    
+
     cloneable = FALSE
 )
+
+#' print.ArvadosFile
+#'
+#' Custom print function for ArvadosFile class
+#'
+#' @param x Instance of ArvadosFile class
+#' @param ... Optional arguments.
+#' @export
+print.ArvadosFile = function(x, ...)
+{
+    collection   <- NULL
+    relativePath <- x$getRelativePath()
+
+    if(!is.null(x$getCollection()))
+    {
+        collection <- x$getCollection()$uuid
+        relativePath <- paste0("/", relativePath)
+    }
+
+    cat(paste0("Type:          ", "\"", "ArvadosFile", "\""), sep = "\n")
+    cat(paste0("Name:          ", "\"", x$getName(),   "\""), sep = "\n")
+    cat(paste0("Relative path: ", "\"", relativePath,  "\""), sep = "\n")
+    cat(paste0("Collection:    ", "\"", collection,    "\""), sep = "\n")
+}