nim-libp2p/tests/testbufferstream.nim

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import unittest, strformat
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import chronos
import ../libp2p/stream/bufferstream
when defined(nimHasUsed): {.used.}
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suite "BufferStream":
test "push data to buffer":
proc testPushTo(): Future[bool] {.async.} =
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proc writeHandler(data: seq[byte]) {.async, gcsafe.} = discard
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let buff = newBufferStream(writeHandler, 16)
check buff.len == 0
var data: seq[char]
data.add(@"12345")
await buff.pushTo(cast[seq[byte]](data))
check buff.len == 5
result = true
check:
waitFor(testPushTo()) == true
test "push and wait":
proc testPushTo(): Future[bool] {.async.} =
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proc writeHandler(data: seq[byte]) {.async, gcsafe.} = discard
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let buff = newBufferStream(writeHandler, 4)
check buff.len == 0
let fut = buff.pushTo(cast[seq[byte]](@"12345"))
check buff.len == 4
check buff.popFirst() == byte(ord('1'))
await fut
check buff.len == 4
result = true
check:
waitFor(testPushTo()) == true
test "read":
proc testRead(): Future[bool] {.async.} =
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proc writeHandler(data: seq[byte]) {.async, gcsafe.} = discard
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let buff = newBufferStream(writeHandler, 10)
check buff.len == 0
await buff.pushTo(cast[seq[byte]](@"12345"))
check @"12345" == cast[string](await buff.read())
result = true
check:
waitFor(testRead()) == true
test "read with size":
proc testRead(): Future[bool] {.async.} =
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proc writeHandler(data: seq[byte]) {.async, gcsafe.} = discard
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let buff = newBufferStream(writeHandler, 10)
check buff.len == 0
await buff.pushTo(cast[seq[byte]](@"12345"))
let data = cast[string](await buff.read(3))
check ['1', '2', '3'] == data
result = true
check:
waitFor(testRead()) == true
test "read and wait":
proc testRead(): Future[bool] {.async.} =
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proc writeHandler(data: seq[byte]) {.async, gcsafe.} = discard
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let buff = newBufferStream(writeHandler, 10)
check buff.len == 0
await buff.pushTo(cast[seq[byte]](@"123"))
check buff.len == 3
let readFut = buff.read(5)
await buff.pushTo(cast[seq[byte]](@"45"))
check buff.len == 2
check cast[string](await readFut) == ['1', '2', '3', '4', '5']
result = true
check:
waitFor(testRead()) == true
test "readExactly":
proc testReadExactly(): Future[bool] {.async.} =
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proc writeHandler(data: seq[byte]) {.async, gcsafe.} = discard
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let buff = newBufferStream(writeHandler, 10)
check buff.len == 0
await buff.pushTo(cast[seq[byte]](@"12345"))
check buff.len == 5
var data: seq[byte] = newSeq[byte](2)
await buff.readExactly(addr data[0], 2)
check cast[string](data) == @['1', '2']
result = true
check:
waitFor(testReadExactly()) == true
test "readLine":
proc testReadLine(): Future[bool] {.async.} =
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proc writeHandler(data: seq[byte]) {.async, gcsafe.} = discard
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let buff = newBufferStream(writeHandler, 16)
check buff.len == 0
await buff.pushTo(cast[seq[byte]](@"12345\n67890"))
check buff.len == 11
check "12345" == await buff.readLine(0, "\n")
result = true
check:
waitFor(testReadLine()) == true
test "readOnce":
proc testReadOnce(): Future[bool] {.async.} =
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proc writeHandler(data: seq[byte]) {.async, gcsafe.} = discard
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let buff = newBufferStream(writeHandler, 10)
check buff.len == 0
var data: seq[byte] = newSeq[byte](3)
let readFut = buff.readOnce(addr data[0], 5)
await buff.pushTo(cast[seq[byte]](@"123"))
check buff.len == 3
check (await readFut) == 3
check cast[string](data) == @['1', '2', '3']
result = true
check:
waitFor(testReadOnce()) == true
test "readUntil":
proc testReadUntil(): Future[bool] {.async.} =
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proc writeHandler(data: seq[byte]) {.async, gcsafe.} = discard
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let buff = newBufferStream(writeHandler, 10)
check buff.len == 0
var data: seq[byte] = newSeq[byte](3)
await buff.pushTo(cast[seq[byte]](@"123$45"))
check buff.len == 6
let readFut = buff.readUntil(addr data[0], 5, @[byte('$')])
check (await readFut) == 4
check cast[string](data) == @['1', '2', '3']
result = true
check:
waitFor(testReadUntil()) == true
test "write ptr":
proc testWritePtr(): Future[bool] {.async.} =
proc writeHandler(data: seq[byte]) {.async, gcsafe.} =
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check cast[string](data) == "Hello!"
let buff = newBufferStream(writeHandler, 10)
check buff.len == 0
var data = "Hello!"
await buff.write(addr data[0], data.len)
result = true
check:
waitFor(testWritePtr()) == true
test "write string":
proc testWritePtr(): Future[bool] {.async.} =
proc writeHandler(data: seq[byte]) {.async, gcsafe.} =
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check cast[string](data) == "Hello!"
let buff = newBufferStream(writeHandler, 10)
check buff.len == 0
await buff.write("Hello!", 6)
result = true
check:
waitFor(testWritePtr()) == true
test "write bytes":
proc testWritePtr(): Future[bool] {.async.} =
proc writeHandler(data: seq[byte]) {.async, gcsafe.} =
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check cast[string](data) == "Hello!"
let buff = newBufferStream(writeHandler, 10)
check buff.len == 0
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await buff.write(cast[seq[byte]]("Hello!"), 6)
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result = true
check:
waitFor(testWritePtr()) == true
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test "write should happen in order":
proc testWritePtr(): Future[bool] {.async.} =
var count = 1
proc writeHandler(data: seq[byte]) {.async, gcsafe.} =
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check cast[string](data) == &"Msg {$count}"
count.inc
let buff = newBufferStream(writeHandler, 10)
check buff.len == 0
await buff.write("Msg 1")
await buff.write("Msg 2")
await buff.write("Msg 3")
await buff.write("Msg 4")
await buff.write("Msg 5")
await buff.write("Msg 6")
await buff.write("Msg 7")
await buff.write("Msg 8")
await buff.write("Msg 9")
await buff.write("Msg 10")
result = true
check:
waitFor(testWritePtr()) == true
test "reads should happen in order":
proc testWritePtr(): Future[bool] {.async.} =
proc writeHandler(data: seq[byte]) {.async, gcsafe.} = discard
let buff = newBufferStream(writeHandler, 10)
check buff.len == 0
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await buff.pushTo(cast[seq[byte]]("Msg 1"))
await buff.pushTo(cast[seq[byte]]("Msg 2"))
await buff.pushTo(cast[seq[byte]]("Msg 3"))
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check cast[string](await buff.read(5)) == "Msg 1"
check cast[string](await buff.read(5)) == "Msg 2"
check cast[string](await buff.read(5)) == "Msg 3"
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await buff.pushTo(cast[seq[byte]]("Msg 4"))
await buff.pushTo(cast[seq[byte]]("Msg 5"))
await buff.pushTo(cast[seq[byte]]("Msg 6"))
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check cast[string](await buff.read(5)) == "Msg 4"
check cast[string](await buff.read(5)) == "Msg 5"
check cast[string](await buff.read(5)) == "Msg 6"
result = true
check:
waitFor(testWritePtr()) == true
test "pipe two streams without the `pipe` or `|` helpers":
proc pipeTest(): Future[bool] {.async.} =
proc writeHandler1(data: seq[byte]) {.async, gcsafe.}
proc writeHandler2(data: seq[byte]) {.async, gcsafe.}
var buf1 = newBufferStream(writeHandler1)
var buf2 = newBufferStream(writeHandler2)
proc writeHandler1(data: seq[byte]) {.async, gcsafe.} =
var msg = cast[string](data)
check msg == "Hello!"
await buf2.pushTo(data)
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proc writeHandler2(data: seq[byte]) {.async, gcsafe.} =
var msg = cast[string](data)
check msg == "Hello!"
await buf1.pushTo(data)
var res1: seq[byte] = newSeq[byte](7)
var readFut1 = buf1.readExactly(addr res1[0], 7)
var res2: seq[byte] = newSeq[byte](7)
var readFut2 = buf2.readExactly(addr res2[0], 7)
await buf1.pushTo(cast[seq[byte]]("Hello2!"))
await buf2.pushTo(cast[seq[byte]]("Hello1!"))
await allFutures(readFut1, readFut2)
check:
res1 == cast[seq[byte]]("Hello2!")
res2 == cast[seq[byte]]("Hello1!")
result = true
check:
waitFor(pipeTest()) == true
test "pipe A -> B":
proc pipeTest(): Future[bool] {.async.} =
var buf1 = newBufferStream()
var buf2 = buf1.pipe(newBufferStream())
var res1: seq[byte] = newSeq[byte](7)
var readFut = buf2.readExactly(addr res1[0], 7)
await buf1.write(cast[seq[byte]]("Hello1!"))
await readFut
check:
res1 == cast[seq[byte]]("Hello1!")
result = true
check:
waitFor(pipeTest()) == true
test "pipe A -> B and B -> A":
proc pipeTest(): Future[bool] {.async.} =
var buf1 = newBufferStream()
var buf2 = newBufferStream()
buf1 = buf1.pipe(buf2).pipe(buf1)
var res1: seq[byte] = newSeq[byte](7)
var readFut1 = buf1.readExactly(addr res1[0], 7)
var res2: seq[byte] = newSeq[byte](7)
var readFut2 = buf2.readExactly(addr res2[0], 7)
await buf1.write(cast[seq[byte]]("Hello1!"))
await buf2.write(cast[seq[byte]]("Hello2!"))
await allFutures(readFut1, readFut2)
check:
res1 == cast[seq[byte]]("Hello2!")
res2 == cast[seq[byte]]("Hello1!")
result = true
check:
waitFor(pipeTest()) == true
test "pipe A -> A (echo)":
proc pipeTest(): Future[bool] {.async.} =
var buf1 = newBufferStream()
buf1 = buf1.pipe(buf1)
proc reader(): Future[seq[byte]] = buf1.read(6)
proc writer(): Future[void] = buf1.write(cast[seq[byte]]("Hello!"))
var writerFut = writer()
var readerFut = reader()
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await writerFut
check:
(await readerFut) == cast[seq[byte]]("Hello!")
result = true
check:
waitFor(pipeTest()) == true
test "pipe with `|` operator - A -> B":
proc pipeTest(): Future[bool] {.async.} =
var buf1 = newBufferStream()
var buf2 = buf1 | newBufferStream()
var res1: seq[byte] = newSeq[byte](7)
var readFut = buf2.readExactly(addr res1[0], 7)
await buf1.write(cast[seq[byte]]("Hello1!"))
await readFut
check:
res1 == cast[seq[byte]]("Hello1!")
result = true
check:
waitFor(pipeTest()) == true
test "pipe with `|` operator - A -> B and B -> A":
proc pipeTest(): Future[bool] {.async.} =
var buf1 = newBufferStream()
var buf2 = newBufferStream()
buf1 = buf1 | buf2 | buf1
var res1: seq[byte] = newSeq[byte](7)
var readFut1 = buf1.readExactly(addr res1[0], 7)
var res2: seq[byte] = newSeq[byte](7)
var readFut2 = buf2.readExactly(addr res2[0], 7)
await buf1.write(cast[seq[byte]]("Hello1!"))
await buf2.write(cast[seq[byte]]("Hello2!"))
await allFutures(readFut1, readFut2)
check:
res1 == cast[seq[byte]]("Hello2!")
res2 == cast[seq[byte]]("Hello1!")
result = true
check:
waitFor(pipeTest()) == true
test "pipe with `|` operator - A -> A (echo)":
proc pipeTest(): Future[bool] {.async.} =
var buf1 = newBufferStream()
buf1 = buf1 | buf1
proc reader(): Future[seq[byte]] = buf1.read(6)
proc writer(): Future[void] = buf1.write(cast[seq[byte]]("Hello!"))
var writerFut = writer()
var readerFut = reader()
await writerFut
check:
(await readerFut) == cast[seq[byte]]("Hello!")
result = true
check:
waitFor(pipeTest()) == true
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# TODO: Need to implement deadlock prevention when
# piping to self
test "pipe deadlock":
proc pipeTest(): Future[bool] {.async.} =
var buf1 = newBufferStream(size = 5)
buf1 = buf1 | buf1
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var count = 30000
proc reader() {.async.} =
while count > 0:
discard await buf1.read(7)
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proc writer() {.async.} =
while count > 0:
await buf1.write(cast[seq[byte]]("Hello2!"))
count.dec
var writerFut = writer()
var readerFut = reader()
await allFutures(readerFut, writerFut)
result = true
check:
waitFor(pipeTest()) == true
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test "shouldn't get stuck on close":
proc test(): Future[bool] {.async.} =
proc createMessage(tmplate: string, size: int): seq[byte] =
result = newSeq[byte](size)
for i in 0 ..< len(result):
result[i] = byte(tmplate[i mod len(tmplate)])
var stream = newBufferStream()
var message = createMessage("MESSAGE", DefaultBufferSize * 2 + 1)
var fut = stream.pushTo(message)
await stream.close()
try:
await wait(fut, 100.milliseconds)
result = true
except AsyncTimeoutError:
result = false
check:
waitFor(test()) == true