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@ledgerhq/logs

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  • License Apache-2.0

Ledger logs central point

Package Exports

  • @ledgerhq/logs
  • @ledgerhq/logs/lib-es/index.js
  • @ledgerhq/logs/lib/index.js

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (@ledgerhq/logs) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

@ledgerhq/logs

Utility library that is used by all Ledger libraries to dispatch logs so we can deal with them in a unified way.

API

Table of Contents

Log

A Log object

type

A namespaced identifier of the log (not a level like "debug", "error" but more like "apdu", "hw", etc...)

Type: LogType

data

Data associated to the log event

Type: LogData

context

Context data, coming for example from the caller's parent, to enable a simple tracing system

Type: TraceContext

id

Unique id among all logs

Type: string

log

Logs something

Parameters

  • type LogType a namespaced identifier of the log (it is not a level like "debug", "error" but more like "apdu-in", "apdu-out", etc...)
  • message string? a clear message of the log associated to the type
  • data LogData?

trace

A simple tracer function, only expanding the existing log function

Its goal is to capture more context than a log function. This is simple for now, but can be improved later.

Parameters

  • context {type: LogType, message: string?, data: LogData?, context: TraceContext?} Anything representing the context where the log occurred

    • context.type
    • context.message
    • context.data
    • context.context

LocalTracer

A simple tracer class, that can be used to avoid repetition when using the trace function

Its goal is to capture more context than a log function. This is simple for now, but can be improved later.

Parameters

  • ``
  • ``
  • type A given type (not level) for the current local tracer ("hw", "withDevice", etc.)
  • context Anything representing the context where the log occurred

withType

Create a new instance of the LocalTracer with an updated type

It does not mutate the calling instance, but returns a new LocalTracer, following a simple builder pattern.

Parameters
  • type LogType

Returns LocalTracer

withContext

Create a new instance of the LocalTracer with a new context

It does not mutate the calling instance, but returns a new LocalTracer, following a simple builder pattern.

Parameters
  • context TraceContext? A TraceContext, that can undefined to reset the context

Returns LocalTracer

withUpdatedContext

Create a new instance of the LocalTracer with an updated context, on which an additional context is merged with the existing one.

It does not mutate the calling instance, but returns a new LocalTracer, following a simple builder pattern.

Parameters
  • contextToAdd TraceContext

Returns LocalTracer

listen

Adds a subscribers to the emitted logs.

Parameters

  • cb Subscriber that is called for each future log() with the Log object

Returns Unsubscribe a function that can be called to unsubscribe the listener