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log.mojo
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log.mojo
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from utils.variant import Variant
import external.gojo.io
from .base import Context, INFO, LEVEL_MAPPING
from .processor import add_timestamp, add_log_level, ProcessorFn, get_processors, GetProcessorsFn
from .formatter import Formatter, DEFAULT_FORMAT, JSON_FORMAT, format
from .style import Styles, get_default_styles, DEFAULT_STYLES, GetStylesFn
alias ValidArgType = Variant[String, StringLiteral, Int, Float32, Float64, Bool]
fn valid_arg_to_string(valid_arg: ValidArgType) -> String:
if valid_arg.isa[StringLiteral]():
return str(valid_arg[StringLiteral])
elif valid_arg.isa[Int]():
return str(valid_arg[Int])
elif valid_arg.isa[Float32]():
return str(valid_arg[Float32])
elif valid_arg.isa[Float64]():
return str(valid_arg[Float64])
elif valid_arg.isa[Bool]():
return str(valid_arg[Bool])
else:
return valid_arg[String]
trait Logger(Movable):
fn info(self, message: String):
...
fn warn(self, message: String):
...
fn error(self, message: String):
...
fn debug(self, message: String):
...
fn fatal(self, message: String):
...
# TODO: Temporary until traits allow fields
fn get_level(self) -> Int:
...
@value
struct PrintLogger(Logger):
var level: Int
fn __init__(inout self, level: Int = WARN):
self.level = level
fn _log_message(self, message: String, level: Int):
if self.level >= level:
print(message)
fn info(self, message: String):
self._log_message(message, INFO)
fn warn(self, message: String):
self._log_message(message, WARN)
fn error(self, message: String):
self._log_message(message, ERROR)
fn debug(self, message: String):
self._log_message(message, DEBUG)
fn fatal(self, message: String):
self._log_message(message, FATAL)
fn get_level(self) -> Int:
return self.level
# TODO: Trying to store processors as a variable struct blows up the compiler. Pulling them out into a function for now.
# Temporary hacky solution, but a function that returns the list of processors to run DOES work. Same with Styles, it blows up the compiler.
struct BoundLogger[L: Logger]():
var _logger: L
var name: String
var level: Int
var context: Context
var formatter: Formatter
var processors: GetProcessorsFn
var styles: GetStylesFn
# var styles: Styles
var apply_styles: Bool
fn __init__(
inout self,
owned logger: L,
*,
name: String = "",
owned context: Context = Context(),
formatter: Formatter = DEFAULT_FORMAT,
processors: GetProcessorsFn = get_processors,
styles: GetStylesFn = get_default_styles,
# styles: Styles = DEFAULT_STYLES,
apply_styles: Bool = True,
):
self._logger = logger^
self.name = name
self.context = context^
self.level = self._logger.get_level()
self.formatter = formatter
self.processors = processors
self.styles = styles
self.apply_styles = apply_styles
fn __moveinit__(inout self, owned other: BoundLogger[L]):
self._logger = other._logger^
self.name = other.name
self.level = other.level
self.context = other.context^
self.formatter = other.formatter
self.processors = other.processors
self.styles = other.styles
self.apply_styles = other.apply_styles
fn _apply_processors(self, context: Context, level: String) -> Context:
var new_context = Context(context)
for processor in self.processors():
new_context = processor[](new_context, level)
return new_context
fn _generate_formatted_message(self, context: Context) -> String:
try:
return format(self.formatter, context)
except e:
# TODO: Decide how to deal with failures in the formatting process. What should fallback be.
# Letting error propagate up isn't too clean imo.
print("Failed to format message.", e)
return ""
fn _apply_style_to_kvs(self, context: Context) -> Context:
var new_context = Context()
var self_styles = self.styles()
for pair in context.items():
var key = str(pair[].key)
var value = str(pair[].value)
# Check if there's a style for the log level.
if key == "level":
value = self_styles.levels.find(value).value()[].render(value)
# Get the style for the message.
elif key == "message":
var style = self_styles.message
value = style.render(value)
# Get the style for the timestamp.
elif key == "timestamp":
var style = self_styles.timestamp
value = style.render(value)
# Check if there's a style for a key and apply it if so, otherwise use the default style for values.
elif key in self_styles.keys:
key = self_styles.keys.find(key).value()[].render(key)
else:
key = self_styles.key.render(key)
# Check if there's a style for the value of a key and apply it if so, otherwise use the default style for values.
if key in self_styles.values:
value = self_styles.values.find(key).value()[].render(value)
else:
value = self_styles.value.render(value)
new_context[key] = value
return new_context
fn _transform_message(self, message: String, level: Int, message_kvs: Dict[String, String]) -> String:
"""Copy context, merge in new keys, apply processors, format message and return.
Args:
message: The message to log.
level: The log level of the message.
message_kvs: Additional key-value pairs to include in the log message.
Returns:
The formatted message.
"""
# Copy context so merged changes don't affect the original
var context = self.get_context()
context["message"] = message
# Add args and kwargs from logger call to context.
for pair in message_kvs.items():
context[pair[].key] = pair[].value
# Enrich context data with processors.
context = self._apply_processors(context, LEVEL_MAPPING[level])
# Do not apply styling to JSON formatted logs or when it's turned off.
if self.formatter != JSON_FORMAT and self.apply_styles:
context = self._apply_style_to_kvs(context)
return self._generate_formatted_message(context)
fn info[T: Stringable, *Ts: Stringable](self, message: T, /, *args: *Ts, **kwargs: ValidArgType):
# TODO: Just copying this logic until arg unpacking works
# Iterate through all args and add it to kwargs. If uneven number, last key will be empty string.
var message_kvs = Dict[String, String]()
for pair in kwargs.items():
message_kvs[pair[].key] = valid_arg_to_string(pair[].value)
var index = 0
var keys = List[String]()
var values = List[String]()
@parameter
fn pair_args[T: Stringable](arg: T) -> None:
if index == 0 or index % 2 == 0:
keys.append(str(arg))
else:
values.append(str(arg))
index += 1
args.each[pair_args]()
for i in range(len(keys)):
var value = String("")
if i < len(values):
value = values[i]
message_kvs[keys[i]] = value
self._logger.info(self._transform_message(message, INFO, message_kvs))
fn warn[T: Stringable, *Ts: Stringable](self, message: T, /, *args: *Ts, **kwargs: ValidArgType):
# Iterate through all args and add it to kwargs. If uneven number, last key will be empty string.
# TODO: kwargs aren't just a dict anymore, need to copy the values over.
var message_kvs = Dict[String, String]()
for pair in kwargs.items():
message_kvs[pair[].key] = valid_arg_to_string(pair[].value)
var index = 0
var keys = List[String]()
var values = List[String]()
@parameter
fn pair_args[T: Stringable](arg: T) -> None:
if index == 0 or index % 2 == 0:
keys.append(str(arg))
else:
values.append(str(arg))
index += 1
args.each[pair_args]()
for i in range(len(keys)):
var value = String("")
if i < len(values):
value = values[i]
message_kvs[keys[i]] = value
self._logger.warn(self._transform_message(message, WARN, message_kvs))
fn error[T: Stringable, *Ts: Stringable](self, message: T, /, *args: *Ts, **kwargs: ValidArgType):
# Iterate through all args and add it to kwargs. If uneven number, last key will be empty string.
var message_kvs = Dict[String, String]()
for pair in kwargs.items():
message_kvs[pair[].key] = valid_arg_to_string(pair[].value)
var index = 0
var keys = List[String]()
var values = List[String]()
@parameter
fn pair_args[T: Stringable](arg: T) -> None:
if index == 0 or index % 2 == 0:
keys.append(str(arg))
else:
values.append(str(arg))
index += 1
args.each[pair_args]()
for i in range(len(keys)):
var value = String("")
if i < len(values):
value = values[i]
message_kvs[keys[i]] = value
self._logger.error(self._transform_message(message, ERROR, message_kvs))
fn debug[T: Stringable, *Ts: Stringable](self, message: T, /, *args: *Ts, **kwargs: ValidArgType):
# Iterate through all args and add it to kwargs. If uneven number, last key will be empty string.
var message_kvs = Dict[String, String]()
for pair in kwargs.items():
message_kvs[pair[].key] = valid_arg_to_string(pair[].value)
var index = 0
var keys = List[String]()
var values = List[String]()
@parameter
fn pair_args[T: Stringable](arg: T) -> None:
if index == 0 or index % 2 == 0:
keys.append(str(arg))
else:
values.append(str(arg))
index += 1
args.each[pair_args]()
for i in range(len(keys)):
var value = String("")
if i < len(values):
value = values[i]
message_kvs[keys[i]] = value
self._logger.debug(self._transform_message(message, DEBUG, message_kvs))
fn fatal[T: Stringable, *Ts: Stringable](self, message: T, /, *args: *Ts, **kwargs: ValidArgType):
# Iterate through all args and add it to kwargs. If uneven number, last key will be empty string.
var message_kvs = Dict[String, String]()
for pair in kwargs.items():
message_kvs[pair[].key] = valid_arg_to_string(pair[].value)
var index = 0
var keys = List[String]()
var values = List[String]()
@parameter
fn pair_args[T: Stringable](arg: T) -> None:
if index == 0 or index % 2 == 0:
keys.append(str(arg))
else:
values.append(str(arg))
index += 1
args.each[pair_args]()
for i in range(len(keys)):
var value = String("")
if i < len(values):
value = values[i]
message_kvs[keys[i]] = value
self._logger.fatal(self._transform_message(message, FATAL, message_kvs))
fn get_context(self) -> Context:
"""Return a deepcopy of the context."""
return Context(self.context)
fn set_context(inout self, context: Context):
self.context = context
fn bind(inout self, context: Context):
"""Bind a new key value pair to the logger context.
NOT USABLE until Mojo adds support for file level scope.
Usable if the logger is built at runtime as a variable, but not as an alias.
Args:
context: The key value pair to bind to the logger context.
"""
for pair in context.items():
self.context[pair[].key] = pair[].value
fn get_level(self) -> Int:
return self.level
fn get_logger(name: String = "", level: Int = INFO) -> BoundLogger[PrintLogger]:
return BoundLogger(PrintLogger(level), name=name)