Enum carboncopy::Level

pub enum Level {
    TRACE,
    DEBUG,
    INFO,
    WARN,
    ERROR,
    FATAL,
}

An enum used to specify the severity level of a log message. Several examples of corresponding scenarios will be provided for each enum variant. The examples are only to be used as a guide and not a hard rule.

Variants

TRACE

Indicates an extremely verbose information which only rarely needs to be activated or perused for detective work (forensics, audits). Activating this level for a sustained period could degrade performance.

Examples:

• The request method, URL, full request body, and full response body of a REST API call to a payment processor.
• An entire form submission.
• Complete step-by-step of a program flow (such as entering and exiting a loop or function).

DEBUG

Indicates an information that helps with debugging, usually containing the value of variables after a significant event triggered by a user activity has just happened.

Examples:

• The updated shipping cost or total price in a shopping cart after an item has been added to it.
• The updated account balance after some money has been transferred into/out of it.
• Error codes returned to users.

INFO

Indicates a useful information that doesn’t qualify as an error.

Examples:

• Notice that an application has just started.
• The IP address and port number that a web service is bound to.
• Notice that a connection with an external service has just been established successfully.

WARN

Indicates a non-desired situation that doesn’t qualify as an error.

Examples:

• A deprecated function or REST API endpoint is invoked or consumed.
• Recovery from a panic which could have been prevented by a simple conditional logic.
• Notice of malicious user activities such as SQL injection attempts or absurdly high number of requests per second.

ERROR

Indicates a serious error that the application can still recover from. An example of such error is when an application which relies on a database failed to connect to it after a single try, but one or more retries will be attempted later.

FATAL

Indicates that a severe error that causes a program to terminate has just happened. An example of such error is when an application which heavily relies on an external service (say, a database) can’t connect to it after many retries. There is no point in continuing execution as the application won’t be able to do much of anything. The process usually must exit after logging the message.

Trait Implementations

impl Clone for Level

fn clone(&self) -> Level

Returns a copy of the value.

pub fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Level

impl Debug for Level

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for Level

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for Level

impl Hash for Level

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

pub fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given Hasher.

impl Ord for Level

fn cmp(&self, other: &Level) -> Ordering

This method returns an Ordering between self and other.

#[must_use]

pub fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

#[must_use]

pub fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

#[must_use]

pub fn clamp(self, min: Self, max: Self) -> Self

Restrict a value to a certain interval.

impl PartialEq<Level> for Level

fn eq(&self, other: &Level) -> bool

This method tests for self and other values to be equal, and is used by ==.

#[must_use]

pub fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl PartialOrd<Level> for Level

fn partial_cmp(&self, other: &Level) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

#[must_use]

pub fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

#[must_use]

pub fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

#[must_use]

pub fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

#[must_use]

pub fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for Level

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error> where
    __S: Serializer, 

Serialize this value into the given Serde serializer.

impl StructuralEq for Level

impl StructuralPartialEq for Level