pub struct Logger(/* private fields */);
Expand description

Middleware for logging request and response summaries to the terminal.

This middleware uses the log crate to output information. Enable log’s output for the “actix_web” scope using env_logger or similar crate.

Default Format

The default Logger uses the following format:

%a "%r" %s %b "%{Referer}i" "%{User-Agent}i" %T

Example Output:
127.0.0.1:54278 "GET /test HTTP/1.1" 404 20 "-" "HTTPie/2.2.0" 0.001074

Examples

use actix_web::{middleware::Logger, App};

// access logs are printed with the INFO level so ensure it is enabled by default
env_logger::init_from_env(env_logger::Env::new().default_filter_or("info"));

let app = App::new()
    // .wrap(Logger::default())
    .wrap(Logger::new("%a %{User-Agent}i"));

Format

VariableDescription
%%The percent sign
%aPeer IP address (or IP address of reverse proxy if used)
%tTime when the request started processing (in RFC 3339 format)
%rFirst line of request (Example: GET /test HTTP/1.1)
%sResponse status code
%bSize of response in bytes, including HTTP headers
%TTime taken to serve the request, in seconds to 6 decimal places
%DTime taken to serve the request, in milliseconds
%URequest URL
%{r}a“Real IP” remote address *
%{FOO}irequest.headers["FOO"]
%{FOO}oresponse.headers["FOO"]
%{FOO}eenv_var["FOO"]
%{FOO}xiCustom request replacement labelled “FOO”
%{FOO}xoCustom response replacement labelled “FOO”

Security

* “Real IP” remote address is calculated using ConnectionInfo::realip_remote_addr()

If you use this value, ensure that all requests come from trusted hosts. Otherwise, it is trivial for the remote client to falsify their source IP address.

Implementations§

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impl Logger

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pub fn new(format: &str) -> Logger

Create Logger middleware with the specified format.

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pub fn exclude<T: Into<String>>(self, path: T) -> Self

Ignore and do not log access info for specified path.

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pub fn exclude_regex<T: Into<String>>(self, path: T) -> Self

Ignore and do not log access info for paths that match regex.

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pub fn log_target(self, target: impl Into<Cow<'static, str>>) -> Self

Sets the logging target to target.

By default, the log target is module_path!() of the log call location. In our case, that would be actix_web::middleware::logger.

Examples

Using .log_target("http_log") would have this effect on request logs:

- [2015-10-21T07:28:00Z INFO  actix_web::middleware::logger] 127.0.0.1 "GET / HTTP/1.1" 200 88 "-" "dmc/1.0" 0.001985
+ [2015-10-21T07:28:00Z INFO  http_log] 127.0.0.1 "GET / HTTP/1.1" 200 88 "-" "dmc/1.0" 0.001985
                              ^^^^^^^^
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pub fn custom_request_replace( self, label: &str, f: impl Fn(&ServiceRequest) -> String + 'static ) -> Self

Register a function that receives a ServiceRequest and returns a String for use in the log line. The label passed as the first argument should match a replacement substring in the logger format like %{label}xi.

It is convention to print “-” to indicate no output instead of an empty string.

Examples
Logger::new("example %{JWT_ID}xi")
    .custom_request_replace("JWT_ID", |req| parse_jwt_id(req.headers().get("Authorization")));
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pub fn custom_response_replace( self, label: &str, f: impl Fn(&ServiceResponse) -> String + 'static ) -> Self

Register a function that receives a ServiceResponse and returns a string for use in the log line.

The label passed as the first argument should match a replacement substring in the logger format like %{label}xo.

It is convention to print “-” to indicate no output instead of an empty string.

The replacement function does not have access to the response body.

Examples
fn log_if_error(res: &ServiceResponse) -> String {
    if res.status().as_u16() >= 400 {
        "ERROR".to_string()
    } else {
        "-".to_string()
    }
}

Logger::new("example %{ERROR_STATUS}xo")
    .custom_response_replace("ERROR_STATUS", |res| log_if_error(res) );

Trait Implementations§

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impl Debug for Logger

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

Formats the value using the given formatter. Read more
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impl Default for Logger

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fn default() -> Logger

Create Logger middleware with format:

%a "%r" %s %b "%{Referer}i" "%{User-Agent}i" %T
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impl<S, B> Transform<S, ServiceRequest> for Loggerwhere S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = Error>, B: MessageBody,

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type Response = ServiceResponse<StreamLog<B>>

Responses produced by the service.
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type Error = Error

Errors produced by the service.
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type Transform = LoggerMiddleware<S>

The TransformService value created by this factory
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type InitError = ()

Errors produced while building a transform service.
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type Future = Ready<Result<<Logger as Transform<S, ServiceRequest>>::Transform, <Logger as Transform<S, ServiceRequest>>::InitError>>

The future response value.
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fn new_transform(&self, service: S) -> Self::Future

Creates and returns a new Transform component, asynchronously

Auto Trait Implementations§

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impl !RefUnwindSafe for Logger

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impl !Send for Logger

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impl !Sync for Logger

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impl Unpin for Logger

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impl !UnwindSafe for Logger

Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> Same<T> for T

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type Output = T

Should always be Self
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for Twhere V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more