307 lines
13 KiB
Nim
307 lines
13 KiB
Nim
# The contents of this file are subject to the Common Public Attribution License
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# Version 1.0 (the “License”); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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# https://myou.dev/licenses/LICENSE-CPAL. The License is based on the Mozilla
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# Public License Version 1.1 but Sections 14 and 15 have been added to cover use
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# of software over a computer network and provide for limited attribution for
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# the Original Developer. In addition, Exhibit A has been modified to be
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# consistent with Exhibit B.
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#
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# Software distributed under the License is distributed on an “AS IS” basis,
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# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
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# the specific language governing rights and limitations under the License.
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#
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# The Original Code is Myou Engine.
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#
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# the Original Developer is the Initial Developer.
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#
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# The Initial Developer of the Original Code is the Myou Engine developers.
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# All portions of the code written by the Myou Engine developers are Copyright
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# (c) 2024. All Rights Reserved.
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#
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# Alternatively, the contents of this file may be used under the terms of the
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# GNU Affero General Public License version 3 (the [AGPL-3] License), in which
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# case the provisions of [AGPL-3] License are applicable instead of those above.
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#
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# If you wish to allow use of your version of this file only under the terms of
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# the [AGPL-3] License and not to allow others to use your version of this file
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# under the CPAL, indicate your decision by deleting the provisions above and
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# replace them with the notice and other provisions required by the [AGPL-3]
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# License. If you do not delete the provisions above, a recipient may use your
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# version of this file under either the CPAL or the [AGPL-3] License.
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## A LoadableResource is similar to a JS promise or a Future, except that you can
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## store it to load it any number of times, and instead of providing an object,
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## you get a pointer, a length, and a function to tell it you're done with it.
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## You cannot have more than one callback, but you can obtain the results of many
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## with `loadAll` or get a callback when many are done with `allDone`
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##
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## TODO IMPORTANT: probably not thread safe, call all functions in the same thread
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## if you use loadAll and allDone
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##
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## TODO: investigate the use of signals instead of callbacks
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type LoadableResourceStatus* = enum
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NotStarted
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Started
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Finished
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Error
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type Result = tuple[ok: bool, err: string, p: pointer, len: int]
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type LoadableResource* = ref object of RootObj
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status: LoadableResourceStatus
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start_func: proc(self: LoadableResource)
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onload_func: proc(ok: bool, err: string, p: pointer, len: int)
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done_func: proc()
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cancel_func: proc()
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str*: proc(): string
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result: ref Result # only to be used with loadAll
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proc newLoadableResource*[T: LoadableResource](
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start: proc(self: LoadableResource),
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done: proc() = nil,
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str: proc(): string = nil,
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): T =
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new(result)
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result.start_func = start
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result.done_func = done
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result.str = str
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if str == nil:
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result.str = proc(): string = ""
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proc start*[T: LoadableResource](self: T) =
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self.status = Started
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self.start_func(self)
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proc `onload=`*[T: LoadableResource](self: T, onload_func: proc(ok: bool, err: string, p: pointer, len: int)) =
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self.onload_func = onload_func
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proc onload*[T: LoadableResource](self: T, ok: bool, err: string, p: pointer, len: int) =
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if self.status == Started:
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self.status = if ok: Finished else: Error
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if self.result != nil:
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self.result[] = (ok, err, p, len)
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if self.onload_func != nil:
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self.onload_func(ok, err, p, len)
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else: # cancelled
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self.status = NotStarted
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if self.done_func != nil:
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self.done_func()
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# TODO: check if we can always use destructors instead of calling this
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proc done*[T: LoadableResource](self: T) =
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if self.status == Started:
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self.cancel()
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else:
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self.status = NotStarted
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if self.done_func != nil:
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self.done_func()
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proc cancel*[T: LoadableResource](self: T) =
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if self.status != Started:
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return
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if self.cancel_func != nil:
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# self.`onload=`(proc(ok, err, p, len: auto) =
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# self.done())
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self.onload_func = proc(ok: bool, err: string, p: pointer, len: int) =
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self.done()
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else:
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self.cancel_func()
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self.status = NotStarted
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# proc allDone*(list: seq[LoadableResource], done: proc()) =
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# proc loadAll*(list: seq[LoadableResource], onload: proc(all_ok: bool, result: seq[Result])) =
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# for i,res in list:
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# if not defined(release):
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# assert res.status == NotStarted, "All resources in the list must be not started"
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# assert res.onload_func == nil, "All resources in the list must not have onload"
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# new(res.result)
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# res.start()
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# list.allDone, proc() =
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# var results = newSeqOfCap[Result](list.len)
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# for res in list:
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# results.add res.result[]
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# res.result = nil
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type Fetch* = ref object of LoadableResource
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custom: pointer
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auto_done: bool
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when not defined(onlyLocalFiles):
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when defined(emscripten):
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type
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FetchAttribute = enum
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LoadToMemory = 1
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StreamData = 2
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PersistFile = 4
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Append = 8
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Replace = 16
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NoDownload = 32
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Synchronous = 64
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Waitable = 128
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emscripten_fetch_attr_t {.importc,nodecl,header:"emscripten/fetch.h".} = object
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requestMethod: array[32, char]
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userData: pointer
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onsuccess: proc(fetch: ptr emscripten_fetch_t) {.cdecl.}
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onerror: proc(fetch: ptr emscripten_fetch_t) {.cdecl.}
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onprogress: proc(fetch: ptr emscripten_fetch_t) {.cdecl.}
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onreadystatechange: proc(fetch: ptr emscripten_fetch_t) {.cdecl.}
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attributes: FetchAttribute # uint32
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timeoutMSecs: uint32
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withCredentials: bool # actually int32
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destinationPath: cstring
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userName: cstring
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password: cstring
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requestHeaders: ptr UncheckedArray[cstring]
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overriddenMimeType: cstring
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requestData: cstring
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requestDataSize: uint
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emscripten_fetch_t {.importc,nodecl.} = object
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id: uint32
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userData: pointer
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url: cstring
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data: pointer
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numBytes: uint64
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dataOffset: uint64
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totalBytes: uint64
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readyState: uint16
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status: uint16
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statusText: array[64, char]
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EmscriptenResult = enum
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TimedOut = -8
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NoData = -7
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Failed = -6
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InvalidParam = -5
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UnknownTarget = -4
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InvalidTarget = -3
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FailedNotDeferred = -2
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NotSupported = -1
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Success = 0
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Deferred = 1
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const EMSCRIPTEN_RESULT_STRINGS = [
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"TimedOut","NoData","Failed","InvalidParam",
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"UnknownTarget","InvalidTarget","FailedNotDeferred",
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"NotSupported","Success","Deferred"]
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proc emscripten_fetch_attr_init(fetch_attr: var emscripten_fetch_attr_t) {.importc,nodecl.}
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proc emscripten_fetch(fetch_attr: var emscripten_fetch_attr_t, url: cstring): ptr emscripten_fetch_t {.importc,nodecl.}
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proc emscripten_fetch_wait(fetch: ptr emscripten_fetch_t, timeoutMSecs: float): EmscriptenResult {.importc,nodecl.}
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proc emscripten_fetch_close(fetch: ptr emscripten_fetch_t): EmscriptenResult {.importc,nodecl.}
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proc emscripten_fetch_get_response_headers_length(fetch: ptr emscripten_fetch_t): uint {.importc,nodecl.}
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proc emscripten_fetch_get_response_headers(fetch: ptr emscripten_fetch_t, dst: cstring , dstSizeBytes: uint): uint {.importc,nodecl.}
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proc emscripten_fetch_unpack_response_headers(headersString: cstring): ptr UncheckedArray[cstring] {.importc,nodecl.}
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proc emscripten_fetch_free_unpacked_response_headers(unpackedHeaders: ptr UncheckedArray[cstring]) {.importc,nodecl.}
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else:
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import std/httpclient
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import std/memfiles
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import std/strutils
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import std/strformat
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func escapeUTF8*(s: string): string =
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result = newStringOfCap(s.len + 5)
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for i,c in s:
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if c > ' ' and c <= '~':
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result &= c
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else:
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result &= '%' & c.byte.toHex
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proc loadUri*(
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uri: string,
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onload_func: proc(ok: bool, err: string, data: pointer, len: int) = nil,
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range = (-1,-1),
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auto_start = true,
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auto_done = true,
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): Fetch {.discardable.} =
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echo "fetching ", uri
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var start_func: proc(self: LoadableResource)
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var done_func: proc()
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var self: Fetch
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var uri = uri
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when not defined(onlyLocalFiles):
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when defined(emscripten):
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const is_remote = true
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else:
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let is_remote = uri.startswith("http://") or uri.startswith("https://")
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if is_remote:
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uri = uri.escapeUTF8
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when defined(emscripten):
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start_func = proc(self: LoadableResource) =
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var attr: emscripten_fetch_attr_t
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emscripten_fetch_attr_init(attr)
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attr.userData = cast[pointer](self)
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attr.requestMethod.addr.copyMem("GET".cstring, 4)
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attr.attributes = LoadToMemory
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attr.onsuccess = proc(fetch: ptr emscripten_fetch_t) {.cdecl.} =
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var self = cast[Fetch](fetch.userData)
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self.custom = fetch.pointer
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self.onload(true, "", fetch.data, fetch.numBytes.int)
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if self.auto_done:
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self.done()
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attr.onerror = proc(fetch: ptr emscripten_fetch_t) {.cdecl.} =
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var self = cast[Fetch](fetch.userData)
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let err_msg = $fetch.statusText.addr.cstring
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let err = emscripten_fetch_close(fetch)
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# self.onload(false, &"Error: {err_msg} ({EMSCRIPTEN_RESULT_STRINGS[err.int + 8]})", nil, 0)
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self.onload(false, &"Error fetching {fetch.url}: {err_msg}", nil, 0)
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if self.auto_done:
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self.done()
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discard emscripten_fetch(attr, uri.cstring)
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done_func = proc() =
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if self.custom != nil:
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discard emscripten_fetch_close(cast[ptr emscripten_fetch_t](self.custom))
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self.custom = nil
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else:
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var client = newHttpClient()
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var response: string
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start_func = proc(self: LoadableResource) =
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let self = cast[Fetch](self)
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var ok = false
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try:
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response = client.getContent(uri)
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ok = true
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except:
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self.onload(false, &"Error fetching {uri}: {getCurrentExceptionMsg()}", nil, 0)
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if ok:
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let p = response[0].addr
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self.onload(true, "", p, response.len)
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if self.auto_done:
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self.done()
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done_func = proc() =
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response = ""
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if not is_remote:
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start_func = proc(self: LoadableResource) =
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when not defined(release):
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var done_called = false
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try:
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var memfile = memfiles.open(uri, mode=fmRead)
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self.done_func = proc() =
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when not defined(release):
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assert not done_called, "Done is being called multiple times. Did you forget to set auto_done = false?"
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done_called = true
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memfile.close()
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self.onload(true, "", memfile.mem, memfile.size)
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# TODO!!!! check whether these objects are freed
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# and if we have to add a destructor, or what
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except OSError:
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self.onload(false, "Could not open file: " & uri, nil, 0)
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if cast[Fetch](self).auto_done:
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self.done()
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proc str(): string = uri
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self = newLoadableResource[Fetch](start_func, done_func, str)
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self.onload_func = onload_func
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self.auto_done = auto_done
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if auto_start:
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start(self)
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return self
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