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test_that("Running Python scripts can be interrupted", {
skip_on_cran()
time <- import("time", convert = TRUE)
# interrupt this process shortly
interruptor <- callr::r_bg(args = list(pid = Sys.getpid()), function(pid) {
Sys.sleep(1)
system2("kill", c("-s", "INT", pid))
# ps::ps_interrupt(ps::ps_handle(pid))
})
# tell Python to sleep
before <- Sys.time()
interrupted <- tryCatch(time$sleep(5), interrupt = identity)
after <- Sys.time()
# check that we caught an interrupt
expect_s3_class(interrupted, "interrupt")
# check that we took a small amount of time
diff <- difftime(after, before, units = "secs")
expect_true(diff < 2)
})
test_that("interrupts work when Python is running", {
skip_on_cran()
p <- callr::r_bg(args = list(python = py_exe()), function(python) {
library(reticulate)
use_python(python)
get_frames <- function() {
r_stack <- sys.calls()
py_stack <- py_capture_output(py_run_string("from traceback import print_stack; print_stack()"))
list(r = r_stack, py = py_stack)
}
frames_before <- get_frames()
py_run_string("print('Initialized Python')")
tryCatch({
py_run_string(glue::trim("
print('Starting', flush=True)
i = 0
while True:
i += 1
"))
}, interrupt = function(e) {
cat("Caught interrupt; ")
})
# confirm that the python stack was unwound correctly
frames_after <- get_frames()
stopifnot(identical(frames_before, frames_after))
cat("Finished!")
})
p$poll_io(5000)
expect_identical(p$read_output_lines(1), "Initialized Python")
p$poll_io(500)
expect_identical(p$read_output_lines(1), "Starting")
p$poll_io(500)
expect_identical(p$read_output(), "")
p$interrupt()
p$wait()
expect_identical(p$get_exit_status(), 0L)
expect_identical(p$read_all_output(), "Caught interrupt; Finished!")
})
test_that("interrupts can be caught by Python", {
skip_on_cran()
p <- callr::r_bg(args = list(python = py_exe()), function(python) {
Sys.setenv(RETICULATE_PYTHON = python)
library(reticulate)
get_frames <- function() {
r_stack <- sys.calls()
py_stack <- py_capture_output(py_run_string("from traceback import print_stack; print_stack()"))
list(r = r_stack, py = py_stack)
}
frames_before <- get_frames()
py_run_string("print('Initialized Python')")
py_run_string(glue::trim("
print('Starting', flush=True)
try:
i = 0
while True:
i += 1
except KeyboardInterrupt:
print('Caught interrupt; ', end='')
finally:
print('Running finally; ', end='')
print('Python finished; ', end = '')
"))
# confirm that the python stack was unwound correctly
frames_after <- get_frames()
stopifnot(identical(frames_before, frames_after))
cat("R Finished!")
})
p$poll_io(5000)
expect_identical(p$read_output_lines(1), "Initialized Python")
p$poll_io(500)
expect_identical(p$read_output_lines(1), "Starting")
p$poll_io(500)
expect_identical(p$read_output(), "")
p$interrupt()
p$wait()
expect_identical(p$get_exit_status(), 0L)
expect_identical(
p$read_all_output(),
"Caught interrupt; Running finally; Python finished; R Finished!")
})
test_that("interrupts can be caught by Python while calling R", {
skip_on_cran()
p <- callr::r_bg(args = list(python = py_exe()), function(python) {
Sys.setenv(RETICULATE_PYTHON = python)
library(reticulate)
get_frames <- function() {
r_stack <- sys.calls()
py_stack <- py_capture_output(py_run_string("from traceback import print_stack; print_stack()"))
list(r = r_stack, py = py_stack)
}
frames_before <- get_frames()
py_run_string("print('Initialized Python')")
py$run_forever_r_func <- function() {
i <- 0
repeat {
i <- i + 1
}
}
py_run_string(glue::trim("
print('Starting', flush=True)
try:
run_forever_r_func()
except KeyboardInterrupt as e:
print('Caught interrupt; ', end='')
finally:
print('Running finally; ', end='')
print('Python finished; ', end = '')
"))
# confirm that the python stack was unwound correctly
frames_after <- get_frames()
stopifnot(identical(frames_before, frames_after))
cat("R Finished!")
})
p$poll_io(5000)
expect_identical(p$read_output_lines(1), "Initialized Python")
p$poll_io(500)
expect_identical(p$read_output_lines(1), "Starting")
p$poll_io(500)
expect_identical(p$read_output(), "")
p$interrupt()
p$wait()
expect_identical(p$get_exit_status(), 0L)
expect_identical(
p$read_all_output(),
"Caught interrupt; Running finally; Python finished; R Finished!")
})
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