@malijs/logger

Development style logger middleware for Mali.

--> GetFeature unary
--> GetFeature unary
<-- GetFeature unary 22ms
<-- GetFeature unary 32ms
--> ListFeatures response_stream
<-- ListFeatures response_stream 21ms
--> RecordRoute request_stream
<-- RecordRoute request_stream 10s
--> RouteChat duplex
<-- RouteChat duplex 10ms

Installation

$ npm install @malijs/logger

Example

import logger from '@malijs/logger'
import Mali from 'mali'

const app = new Mali(path.resolve(__dirname, './helloworld.proto'), 'Greeter')
app.use(logger())
app.use({
  sayHello: ({ res, req }) => (res = `Hello ${req.name}`)
})
app.start('0.0.0.0:50051')

API

logger(options)

options.fullName

To log full name (fullName) from context, otherwise logs just the name. Default: false.

app.use(logger({ fullName: true }))

Output:

--> /routeguide.RouteGuide/GetFeature unary
<-- /routeguide.RouteGuide/GetFeature unary 22ms

options.timestamp

Enables or disables the inclusion of a timestamp in the log message. If a function is supplied, it is passed a Date timestamp and it must synchronously return the string representation to be logged. There are predefined timestamp functions: epochTime (default), unixTime, and isoTime.

Default timestamp:

app.use(logger({timestamp: true}))

Output:

--> 1556325859071 GetFeature unary
<-- 1556325859071 GetFeature unary 6ms

With custom predefined timestamp:

app.use(logger({timestamp: logger.isoTime}))

Output:

--> 2019-04-27T00:44:19.083Z GetFeature unary
<-- 2019-04-27T00:44:19.083Z GetFeature unary 4ms

With custom timestamp function:

app.use(logger({ timestamp: date => `${date.toDateString()} ${date.toLocaleTimeString()}` }))

Output:

--> Fri Apr 26 2019 9:44:19 PM GetFeature unary
<-- Fri Apr 26 2019 9:44:19 PM GetFeature unary 18ms

Timestamp functions

• logger.epochTime - Milliseconds since Unix epoch. Default. Used when timestamp: true.
• logger.unixTime - Seconds since Unix epoch.
• logger.isoTime - Timestamp in ISO time.

options.request

Enables or disables the inclusion of request in the log message. By default JSON.stringify is used. If a function is supplied it is passed the request from the context.

app.use(logger({ request: true }))

Output:

--> GetFeature {"latitude":409146138,"longitude":-746188906} unary
<-- GetFeature unary 2ms

options.response

Enables or disables the inclusion of response in the log message. By default JSON.stringify is used. If a function is supplied it is passed the response from the context.

app.use(logger({ response: true }))

Output:

--> GetFeature unary
<-- GetFeature {"location":{"latitude":409146138,"longitude":-746188906},"name":"Berkshire Valley Management Area Trail, Jefferson, NJ, USA"} unary 3ms

With custom request and response logging functions:

app.use(logger({ 
  request: req => `(${req.latitude}, ${req.longitude})`,
  response: res => `[${res.name}]`
}))

Output:

--> GetFeature (409146138, -746188906) unary
<-- GetFeature [Berkshire Valley Management Area Trail, Jefferson, NJ, USA] unary 4ms

Notes

Recommended that you .use() this middleware near the top to "wrap" all subsequent middleware.

License

Apache 2.0