perldoc > Test2::EventFacet::Trace

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📛 NAME

Test2::EventFacet::Trace — Debug information for events

🚀 Quick Reference

Use Case	Command	Description
📦 Create a new trace	Test2::EventFacet::Trace->new(frame => [$pkg, $file, $line, $sub])	Create a new debug info trace object
🔍 Get call frame info	$trace->call	Get basic call info as a list (package, file, line, subname)
🐛 Get debug string	$trace->debug	Returns "at FILE line LINE" or custom detail message
⚠️ Issue warning at frame	$trace->alert($MESSAGE)	Warn with filename/line number of the trace frame
🚨 Throw exception at frame	$trace->throw($MESSAGE)	Die with filename/line number of the trace frame
🆔 Get signature	$trace->signature	Unique signature string (pid+tid+file+line+cid)
📋 Get full caller info	$trace->full_call	Get full caller(N) results array
⚙️ Get warning bits	$trace->warning_bits	Get index 9 from caller info (warnings settings)
🎯 Access individual fields	$trace->package / $trace->file / $trace->line / $trace->subname	Get individual debug-info components

📖 DESCRIPTION

The Test2::API::Context object, as well as all Test2::Event types need to have access to information about where they were created. This object represents that information.

📝 SYNOPSIS

use Test2::EventFacet::Trace;

my $trace = Test2::EventFacet::Trace->new(
    frame => [$package, $file, $line, $subname],
);

🧩 FACET FIELDS

📄 detail / details

$string = $trace->{details}
$string = $trace->details()

Used as a custom trace message that will be used INSTEAD of "at <FILE> line <LINE>" when calling $trace->debug.

🖼️ frame

$frame = $trace->{frame}
$frame = $trace->frame()

Get the call frame arrayref:

[$package, $file, $line, $subname]

⚙️ pid

$int = $trace->{pid}
$int = $trace->pid()

🧵 The process ID in which the event was generated.

⚙️ tid

$int = $trace->{tid}
$int = $trace->tid()

🧵 The thread ID in which the event was generated.

🆔 cid

$id = $trace->{cid}
$id = $trace->cid()

🔗 The ID of the context that was used to create the event.

🆔 uuid

$uuid = $trace->{uuid}
$uuid = $trace->uuid()

🔑 The UUID of the context that was used to create the event. (If uuid tagging was enabled)

📞 call

($pkg, $file, $line, $subname) = $trace->call

Get the basic call info as a list.

📋 full_call

@caller = $trace->full_call

Get the full caller(N) results.

⚠️ warning_bits

$warning_bits = $trace->warning_bits

Get index 9 from the full caller info. This is the warnings_bits field.

The value of this is not portable across perl versions or even processes. However it can be used in the process that generated it to reproduce the warnings settings in a new scope:

eval <<EOT;
BEGIN { ${^WARNING_BITS} = $trace->warning_bits };
... context's warning settings apply here ...
EOT

⚠️ DISCOURAGED HUB RELATED FIELDS

These fields were not always set properly by tools. These are MOSTLY deprecated by the Test2::EventFacet::Hub facets. These fields are not required, and may only reflect the hub that was current when the event was created, which is not necessarily the same as the hub the event was sent through.

Some tools did do a good job setting these to the correct hub, but you cannot always rely on that. Use the hubs facet list instead.

🆔 hid

$hid = $trace->{hid}
$hid = $trace->hid()

🔗 The ID of the hub that was current when the event was created.

🆔 huuid

$huuid = $trace->{huuid}
$huuid = $trace->huuid()

🔑 The UUID of the hub that was current when the event was created. (If uuid tagging was enabled).

🔢 nested

$int = $trace->{nested}
$int = $trace->nested()

📊 How deeply nested the event is.

📦 buffered

$bool = $trace->{buffered}
$bool = $trace->buffered()

✅ True if the event was buffered and not sent to the formatter independent of a parent (This should never be set when nested is 0 or undef).

🛠️ METHODS

Note: All facet fields are also methods.

✏️ set_detail / detail

$trace->set_detail($msg)
$msg = $trace->detail

Used to get/set a custom trace message that will be used INSTEAD of "at <FILE> line <LINE>" when calling $trace->debug.

detail() is an alias to the details facet field for backwards compatibility.

🐛 debug

$str = $trace->debug

Typically returns the string "at <FILE> line <LINE>". If detail is set then its value will be returned instead.

⚠️ alert

$trace->alert($MESSAGE)

This issues a warning at the frame (filename and line number where errors should be reported).

🚨 throw

$trace->throw($MESSAGE)

This throws an exception at the frame (filename and line number where errors should be reported).

📞 call

($package, $file, $line, $subname) = $trace->call()

Get the caller details for the debug-info. This is where errors should be reported.

📦 package

$pkg = $trace->package

Get the debug-info package.

📄 file

$file = $trace->file

Get the debug-info filename.

📏 line

$line = $trace->line

Get the debug-info line number.

🏷️ subname

$subname = $trace->subname

Get the debug-info subroutine name.

🔑 signature

$sig = $trace->signature

Get a signature string that identifies this trace. This is used to check if multiple events are related. The signature includes pid, tid, file, line number, and the cid.

📂 SOURCE

The source code repository for Test2 can be found at http://github.com/Test-More/test-more/.

👥 MAINTAINERS

Chad Granum <exodist AT cpan.org>

✍️ AUTHORS

Chad Granum <exodist AT cpan.org>

©️ COPYRIGHT

Copyright 2020 Chad Granum <exodist AT cpan.org>.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

See http://dev.perl.org/licenses/

📛 NAME 🚀 Quick Reference 📖 DESCRIPTION 📝 SYNOPSIS 🧩 FACET FIELDS 🛠️ METHODS 📂 SOURCE 👥 MAINTAINERS ✍️ AUTHORS ©️ COPYRIGHT