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v/vlib/log/log.v

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// Copyright (c) 2019-2022 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
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module log
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import os
import time
import term
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// Level defines possible log levels used by `Log`
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pub enum Level {
disabled = 0
fatal
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error
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warn
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info
debug
}
// LogTarget defines possible log targets
pub enum LogTarget {
console
file
both
}
// tag_to_cli returns the tag for log level `l` as a colored string.
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fn tag_to_cli(l Level) string {
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return match l {
.disabled { '' }
.fatal { term.red('FATAL') }
.error { term.red('ERROR') }
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.warn { term.yellow('WARN ') }
.info { term.white('INFO ') }
.debug { term.blue('DEBUG') }
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}
}
// tag_to_file returns the tag for log level `l` as a string.
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fn tag_to_file(l Level) string {
return match l {
.disabled { ' ' }
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.fatal { 'FATAL' }
.error { 'ERROR' }
.warn { 'WARN ' }
.info { 'INFO ' }
.debug { 'DEBUG' }
}
}
// level_from_tag returns the log level from the given string if it matches.
pub fn level_from_tag(tag string) ?Level {
return match tag {
'DISABLED' { Level.disabled }
'FATAL' { Level.fatal }
'ERROR' { Level.error }
'WARN' { Level.warn }
'INFO' { Level.info }
'DEBUG' { Level.debug }
else { none }
}
}
// target_from_label returns the log target from the given string if it matches.
pub fn target_from_label(label string) ?LogTarget {
return match label {
'console' { LogTarget.console }
'file' { LogTarget.file }
'both' { LogTarget.both }
else { none }
}
}
// Logger is an interface that describes a generic Logger
pub interface Logger {
mut:
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fatal(s string)
error(s string)
warn(s string)
info(s string)
debug(s string)
set_level(level Level)
}
// Log represents a logging object
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pub struct Log {
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mut:
level Level
output_label string
ofile os.File
output_target LogTarget // output to console (stdout/stderr) or file or both.
pub mut:
output_file_name string // log output to this file
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}
// get_level gets the internal logging level.
pub fn (mut l Log) get_level() Level {
return l.level
}
// set_level sets the internal logging to `level`.
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pub fn (mut l Log) set_level(level Level) {
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l.level = level
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}
// set_output_level sets the internal logging output to `level`.
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pub fn (mut l Log) set_output_level(level Level) {
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l.level = level
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}
// set_full_logpath sets the output label and output path from `full_log_path`.
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pub fn (mut l Log) set_full_logpath(full_log_path string) {
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rlog_file := os.real_path(full_log_path)
l.set_output_label(os.file_name(rlog_file))
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l.set_output_path(os.dir(rlog_file))
}
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// set_output_label sets the `label` for the output.
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pub fn (mut l Log) set_output_label(label string) {
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l.output_label = label
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}
// set_output_path sets the file to which output is logged to.
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pub fn (mut l Log) set_output_path(output_file_path string) {
if l.ofile.is_opened {
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l.ofile.close()
}
l.output_target = .file
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l.output_file_name = os.join_path(os.real_path(output_file_path), l.output_label)
ofile := os.open_append(l.output_file_name) or {
panic('error while opening log file $l.output_file_name for appending')
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}
l.ofile = ofile
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}
// log_to_console_too turns on logging to the console too, in addition to logging to a file.
// You have to call it *after* calling .set_output_path(output_file_path).
pub fn (mut l Log) log_to_console_too() {
if l.output_target != .file {
panic('log_to_console_too should be called *after* .set_output_path')
}
l.output_target = .both
}
// flush writes the log file content to disk.
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pub fn (mut l Log) flush() {
l.ofile.flush()
}
// close closes the log file.
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pub fn (mut l Log) close() {
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l.ofile.close()
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}
// log_file writes log line `s` with `level` to the log file.
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fn (mut l Log) log_file(s string, level Level) {
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timestamp := time.now().format_ss()
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e := tag_to_file(level)
l.ofile.writeln('$timestamp [$e] $s') or { panic(err) }
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}
// log_cli writes log line `s` with `level` to stdout.
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fn (l &Log) log_cli(s string, level Level) {
timestamp := time.now().format_ss()
e := tag_to_cli(level)
println('$timestamp [$e] $s')
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}
// send_output writes log line `s` with `level` to either the log file or the console
// according to the value of the `.output_target` field.
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pub fn (mut l Log) send_output(s &string, level Level) {
if l.output_target == .file || l.output_target == .both {
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l.log_file(s, level)
}
if l.output_target == .console || l.output_target == .both {
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l.log_cli(s, level)
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}
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}
// fatal logs line `s` via `send_output` if `Log.level` is greater than or equal to the `Level.fatal` category.
// Note that this method performs a panic at the end, even if log level is not enabled.
[noreturn]
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pub fn (mut l Log) fatal(s string) {
if int(l.level) >= int(Level.fatal) {
l.send_output(s, .fatal)
l.ofile.close()
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}
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panic('$l.output_label: $s')
}
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// error logs line `s` via `send_output` if `Log.level` is greater than or equal to the `Level.error` category.
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pub fn (mut l Log) error(s string) {
if int(l.level) < int(Level.error) {
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return
}
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l.send_output(s, .error)
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}
// warn logs line `s` via `send_output` if `Log.level` is greater than or equal to the `Level.warn` category.
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pub fn (mut l Log) warn(s string) {
if int(l.level) < int(Level.warn) {
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return
}
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l.send_output(s, .warn)
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}
// info logs line `s` via `send_output` if `Log.level` is greater than or equal to the `Level.info` category.
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pub fn (mut l Log) info(s string) {
if int(l.level) < int(Level.info) {
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return
}
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l.send_output(s, .info)
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}
// debug logs line `s` via `send_output` if `Log.level` is greater than or equal to the `Level.debug` category.
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pub fn (mut l Log) debug(s string) {
if int(l.level) < int(Level.debug) {
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return
}
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l.send_output(s, .debug)
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}