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v/vlib/io/util/util.v

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module util
import os
import rand
const (
retries = 10000
)
[params]
pub struct TempFileOptions {
path string = os.temp_dir()
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pattern string
}
// temp_file returns a uniquely named, open, writable, `os.File` and it's path.
pub fn temp_file(tfo TempFileOptions) !(os.File, string) {
mut d := tfo.path
if d == '' {
d = os.temp_dir()
}
os.ensure_folder_is_writable(d) or {
return error(@FN +
' could not create temporary file in "${d}". Please ensure write permissions.')
}
d = d.trim_right(os.path_separator)
prefix, suffix := prefix_and_suffix(tfo.pattern) or { return error(@FN + ' ${err.msg()}') }
for retry := 0; retry < util.retries; retry++ {
path := os.join_path(d, prefix + random_number() + suffix)
mut mode := 'rw+'
$if windows {
mode = 'w+'
}
mut file := os.open_file(path, mode, 0o600) or { continue }
if os.exists(path) && os.is_file(path) {
return file, path
}
}
return error(@FN +
' could not create temporary file in "${d}". Retry limit (${util.retries}) exhausted. Please ensure write permissions.')
}
[params]
pub struct TempDirOptions {
path string = os.temp_dir()
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pattern string
}
fn error_for_temporary_folder(fn_name string, d string) !string {
return error('${fn_name} could not create temporary directory "${d}". Please ensure you have write permissions for it.')
}
// temp_dir returns a uniquely named, writable, directory path.
pub fn temp_dir(tdo TempFileOptions) !string {
mut d := tdo.path
if d == '' {
d = os.temp_dir()
}
os.ensure_folder_is_writable(d) or { return error_for_temporary_folder(@FN, d) }
d = d.trim_right(os.path_separator)
prefix, suffix := prefix_and_suffix(tdo.pattern) or { return error(@FN + ' ${err.msg()}') }
for retry := 0; retry < util.retries; retry++ {
path := os.join_path(d, prefix + random_number() + suffix)
os.mkdir_all(path) or { continue }
if os.is_dir(path) && os.exists(path) {
os.ensure_folder_is_writable(path) or { return error_for_temporary_folder(@FN, d) }
return path
}
}
return error('${@FN} could not create temporary directory "${d}". Retry limit (${util.retries}) exhausted.')
}
// * Utility functions
fn random_number() string {
s := (1_000_000_000 + (u32(os.getpid()) + rand.u32n(1_000_000_000) or { 0 })).str()
return s.substr(1, s.len)
}
fn prefix_and_suffix(pattern string) ?(string, string) {
mut pat := pattern
if pat.contains(os.path_separator) {
return error('pattern cannot contain path separators (${os.path_separator}).')
}
pos := pat.last_index('*') or { -1 }
mut prefix := ''
mut suffix := ''
if pos != -1 {
prefix = pat.substr(0, pos)
suffix = pat.substr(pos + 1, pat.len)
} else {
prefix = pat
}
return prefix, suffix
}