Okio: Is there a way to get access to app private files directory on android with `FileSystem` ? Alw...

# squarelibraries

[xxfast]

Okio: Is there a way to get access to app private files directory on android with FileSystem ? Always get

Caused by: android.system.ErrnoException: open failed: EROFS (Read-only file system)

when I do this on androidMain

FileSystem.SYSTEM.sink("test.json".toPath)

[saket]

Wanna try out https://google.github.io/modernstorage/storage/ that uses okio underneath?

[xxfast]

is that multiplatform? my use-case is multiplatform

[xxfast]

Turns out you need android context to get a file path to app files dir

FileSystem.SYSTEM.sink("${context.filesDir.path}/test.json".toPath())

[xxfast]

However, looks like encoders that use these sinks doesn't really work 🤔 not sure why - no exception is getting thrown

[yschimke]

Not an answer, but you probably don't need the string template. / works on path as an operator.

[xxfast]

Welp, turns out this was just my bad. I inspected the file directories and it was getting written just fine. The problem was just how I was subscribing to the updates on the start, and it was always emitting just null. This was simply fixed with just

val updates: Flow<T?> get() = this.stateFlow
  .onStart { read() }

and added a test case for this with

@Test
fun testUpdatesWithPreviouslyStoredValue() = runTest {
  FILE_SYSTEM.sink(filePath.toPath()).buffer().use { Json.encode(OREO, it) }
  val newStore: KStore<Pet> = store(filePath = filePath)
  newStore.updates.test {
    assertEquals(OREO, awaitItem())
  }
}

More in https://github.com/xxfast/KStore/commit/cca82cfd4c8d914812ee8a700a140a3d1caa687d