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package triad
package http
import curl._
import curlh._
import scala.collection.{Map, mutable}
import scala.collection.mutable.ArrayBuffer
import scala.concurrent.Future
import scala.scalanative.native._
import scala.util.{Failure, Success, Try}
object CurlBackend {
type Chunk = CStruct4[Ptr[CStruct0], Ptr[CStruct0], CSize, Ptr[Byte]]
implicit class ChunksOps(val self: Ptr[Chunk]) extends AnyVal {
@inline def prev: Ptr[Chunk] = (!self._1).cast[Ptr[Chunk]]
@inline def prev_=(other: Ptr[Chunk]): Unit =
!(self._1) = other.cast[Ptr[CStruct0]]
@inline def next: Ptr[Chunk] = (!self._2).cast[Ptr[Chunk]]
@inline def next_=(other: Ptr[Chunk]): Unit =
!(self._2) = other.cast[Ptr[CStruct0]]
@inline def size: CSize = !(self._3)
@inline def size_=(value: CSize): Unit = !(self._3) = value
@inline def buffer: Ptr[Byte] = !(self._4)
@inline def buffer_=(value: Ptr[Byte]): Unit = !(self._4) = value
}
object Chunk {
@inline def NullPtr[T] = 0.cast[Ptr[T]]
def allocHead() = allocAppend(0, NullPtr[Chunk])
def allocAppend(size: CSize,
head: Ptr[Chunk] = NullPtr[Chunk]): Ptr[Chunk] = {
val chunk: Ptr[Chunk] = stdlib.malloc(sizeof[Chunk]).cast[Ptr[Chunk]]
if (chunk == NullPtr[Chunk]) return NullPtr[Chunk]
chunk.buffer = stdlib.malloc(size)
if (chunk.buffer == NullPtr[Chunk] && size != 0) {
stdlib.free(chunk.cast[Ptr[Byte]])
return NullPtr[Chunk]
}
chunk.size = size
if (head == NullPtr[Chunk]) { // this will be the head
chunk.next = chunk
chunk.prev = chunk
} else {
val last = head.prev
last.next = chunk
chunk.prev = last
head.prev = chunk
chunk.next = head
}
chunk
}
def freeAll(head: Ptr[Chunk]): Unit = {
var chunk: Ptr[Chunk] = head
do {
val next = chunk.next
stdlib.free(chunk.buffer)
stdlib.free(chunk.cast[Ptr[Byte]])
chunk = next
} while (chunk != head)
}
def toArray(head: Ptr[Chunk]): Array[Byte] = {
val buffer = new ArrayBuffer[Byte]()
var chunk = head
do {
val next = chunk.next
var i = 0l
while (i < next.size) {
buffer += next.buffer(i)
i += 1
}
chunk = next
} while (chunk != head)
buffer.toArray
}
def traverse(head: Ptr[Chunk])(fct: Array[Byte] => Unit) = {
var chunk = head
do {
val next = chunk.next
val buffer = new ArrayBuffer[Byte]()
var i = 0l
while (i < next.size) {
buffer += next.buffer(i)
i += 1
}
chunk = next
fct(buffer.toArray)
} while (chunk != head)
}
}
private def receive(data: Ptr[Byte],
size: CSize,
nmemb: CSize,
userdata: Ptr[Byte]): CSize = {
val head = userdata.cast[Ptr[Chunk]]
val length = size * nmemb
val chunk = Chunk.allocAppend(length, head)
string.memcpy(chunk.buffer, data, chunk.size)
chunk.size
}
private val receivePtr: WriteFunction = CFunctionPtr.fromFunction4(receive)
private def chain[A](success: A)(calls: (() => A)*) = {
var result: A = success
for (c <- calls if result == success) {
result = c()
}
result
}
private def request(request: Request)(implicit z: Zone): Try[Response] = {
val curl: CURL = curl_easy_init()
if (curl != null) {
val errorBuffer = stackalloc[Byte](CURL_ERROR_SIZE)
!errorBuffer = 0
val requestHeaders = stackalloc[curl_slist](1)
!requestHeaders = 0.cast[curl_slist]
val responseChunks = Chunk.allocHead()
val responseHeaderChunks = Chunk.allocHead()
val curlResult = chain(CURLcode.CURL_OK)(
() =>
curl_easy_setopt(curl, CURLoption.CURLOPT_ERRORBUFFER, errorBuffer),
() =>
curl_easy_setopt(curl,
CURLoption.CURLOPT_CUSTOMREQUEST,
toCString(request.method)),
() =>
curl_easy_setopt(curl,
CURLoption.CURLOPT_URL,
toCString(request.url)),
() => {
val buffer = ArrayUtils.toBuffer(request.body)
curl_easy_setopt(curl, CURLoption.CURLOPT_POSTFIELDS, buffer)
curl_easy_setopt(curl,
CURLoption.CURLOPT_POSTFIELDSIZE,
request.body.size)
},
() => {
for ((k, v) <- request.headers) {
!requestHeaders =
curl_slist_append(!requestHeaders, toCString(s"$k:$v"))
}
curl_easy_setopt(curl, CURLoption.CURLOPT_HTTPHEADER, !requestHeaders)
},
() =>
curl_easy_setopt(curl, CURLoption.CURLOPT_WRITEFUNCTION, receivePtr),
() =>
curl_easy_setopt(curl, CURLoption.CURLOPT_WRITEDATA, responseChunks),
() =>
curl_easy_setopt(curl,
CURLoption.CURLOPT_HEADERDATA,
responseHeaderChunks),
() => curl_easy_perform(curl)
)
val result = curlResult match {
case CURLcode.CURL_OK =>
val responseCode: Ptr[Long] = stackalloc[Long](1)
curl_easy_getinfo(curl, CURLINFO.CURLINFO_RESPONSE_CODE, responseCode)
val responseHeaders = mutable.HashMap.empty[String, String]
Chunk.traverse(responseHeaderChunks) { headerChunk =>
val line = new String(headerChunk, "utf-8").trim
if (line.contains(":")) {
val parts = line.split(":", 2)
responseHeaders += parts(0) -> parts(1)
}
}
Success(
Response(
statusCode = (!responseCode).toInt,
headers = responseHeaders.toMap,
body = Chunk.toArray(responseChunks)
))
case code =>
val message = curl_easy_strerror(curl, code)
Failure(
new RuntimeException(
s"${fromCString(errorBuffer)} (curl exit status $code)"))
}
Chunk.freeAll(responseChunks)
Chunk.freeAll(responseHeaderChunks)
curl_slist_free_all(!requestHeaders)
curl_easy_cleanup(curl)
result
} else {
Failure(new RuntimeException(s"curl failed to initialize"))
}
}
def curlVersion = fromCString(curl_version())
}
trait CurlBackend extends Backend {
def send(req: Request): Future[Response] = Zone { implicit z =>
Future.fromTry(CurlBackend.request(req))
}
}
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