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# rb (sasl v4.3)

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The Report Browser Tool

The Report Browser (RB) tool is used to browse and format error reports written by the error logger handler `log_mf_h` in STDLIB.

# Summary

## Types

filter()
option()
regexp()
type()

## Functions

filter(Filters)

Equivalent to `filter/2`.

filter(Filters, Dates)

Displays the reports that match the provided filters.

grep(RegExp)

All reports matching the regular expression `RegExp` are displayed. `RegExp` can be any of the following

h()

Equivalent to `help()`.

help()

Displays online help information.

list()

Equivalent to `list(all)`.

list(Type)

Lists all reports loaded in `rb_server`. Each report is given a unique number that can be used as a reference to the report in function `show/1`.

log_list()

Equivalent to `log_list(all)`.

log_list(Type)

Same as functions `list/0` or `list/1`, but the result is printed to a log file, if set; otherwise to `standard_io`.

rescan()

Equivalent to `rescan([])`.

rescan(Options)

Rescans the report directory. `Options` is the same as for function `start/1`.

show()

All reports are displayed.

show(Report)

If argument `Report` is specified as one of the values of `type()`, all loaded reports of that type are displayed. If `Report` is specified as an integer, the report with this reference number is displayed.

start()

Equivalent to `start([])`.

start(Options)

Function `start/1` starts `rb_server` with the specified options, whereas function `start/0` starts with default options.

start_log(FileName)

Redirects all report output from the RB tool to the specified file, registered name, or `io_device`.

stop()

Stops `rb_server`.

stop_log()

Closes the log file. The output from the RB tool is directed to `standard_io`.

# Types

# filter()

(not exported)

    -type filter() ::
              {Key :: term(), Value :: term()} |
              {Key :: term(), Value :: term(), no} |
              {Key :: term(), RegExp :: regexp(), re} |
              {Key :: term(), RegExp :: regexp(), re, no}.

# option()

(not exported)

    -type option() ::
              {start_log, FileName :: string() | atom() | pid()} |
              {max, MaxNoOfReports :: integer() | all} |
              {report_dir, DirString :: string()} |
              {type, ReportType :: type() | [type()] | all} |
              {abort_on_error, boolean()}.

# regexp()

(not exported)

    -type regexp() ::
              string() |
              {string(), Options :: [re:options()]} |
              re:mp() |
              {re:mp(), Options :: [re:compile_options()]}.

# type()

(not exported)

    -type type() ::
              error | error_report | info_msg | info_report | warning_msg | warning_report | crash_report |
              supervisor_report | progress | all.

# Functions

# filter(Filters)

(since OTP R13B04)

    -spec filter(Filters) -> term() when Filters :: [filter()].

Equivalent to `filter/2`.

# filter(Filters, Dates)

(since OTP R13B04)

    -spec filter(Filters, Dates) -> term()
                    when
                        Filters :: [filter()],
                        Dates :: {DateFrom, DateTo} | {DateFrom, from} | {DateTo, to},
                        DateFrom :: calendar:datetime(),
                        DateTo :: calendar:datetime().

Displays the reports that match the provided filters.

When a filter includes the `no` atom, it excludes the reports that match that filter.

The reports are matched using the `proplists` module in STDLIB. The report must be a proplist to be matched against any of the filters.

If the filter has the form `{Key, RegExp, re}`, the report must contain an element with key equal to `Key` and the value must match the regular expression `RegExp`.

If parameter `Dates` is specified, the reports are filtered according to the date when they occurred. If `Dates` has the form `{DateFrom, from}`, reports that occurred after `DateFrom` are displayed.

If `Dates` has the form `{DateTo, to}`, reports that occurred before `DateTo` are displayed.

If two `Dates` are specified, reports that occurred between those dates are returned.

To filter only by dates, specify the empty list as the `Filters` parameter.

For details about parameter `RegExp`, see `rb:grep/1`.

For details about data type `mp()`, see `re:mp/0`.

For details about data type `datetime()`, see `calendar:datetime/0`.

# grep(RegExp)

    -spec grep(RegExp :: regexp()) -> term().

All reports matching the regular expression `RegExp` are displayed. `RegExp` can be any of the following:

- A string containing the regular expression
- A tuple with the string and the options for compilation
- A compiled regular expression
- A compiled regular expression and the options for running it

For a definition of valid regular expressions and options, see the `re` module in STDLIB and in particular function `re:run/3`.

For details about data type `mp()`, see `re:mp/0`.

# h()

    -spec h() -> term().

Equivalent to `help()`.

# help()

    -spec help() -> term().

Displays online help information.

# list()

    -spec list() -> term().

Equivalent to `list(all)`.

# list(Type)

    -spec list(Type :: type()) -> term().

Lists all reports loaded in `rb_server`. Each report is given a unique number that can be used as a reference to the report in function `show/1`.

If no `Type` is specified, all reports are listed.

# log_list()

(since OTP R16B02)

    -spec log_list() -> term().

Equivalent to `log_list(all)`.

# log_list(Type)

(since OTP R16B02)

    -spec log_list(Type :: type()) -> term().

Same as functions `list/0` or `list/1`, but the result is printed to a log file, if set; otherwise to `standard_io`.

If no `Type` is specified, all reports are listed.

# rescan()

    -spec rescan() -> term().

Equivalent to `rescan([])`.

# rescan(Options)

    -spec rescan(Options) -> term() when Options :: [option()].

Rescans the report directory. `Options` is the same as for function `start/1`.

# show()

    -spec show() -> term().

All reports are displayed.

# show(Report)

    -spec show(Report) -> term() when Report :: integer() | type().

If argument `Report` is specified as one of the values of `type()`, all loaded reports of that type are displayed. If `Report` is specified as an integer, the report with this reference number is displayed.

# start()

    -spec start() -> term().

Equivalent to `start([])`.

# start(Options)

    -spec start(Options) -> term() when Options :: [option()].

Function `start/1` starts `rb_server` with the specified options, whereas function `start/0` starts with default options.

`rb_server` must be started before reports can be browsed. When `rb_server` is started, the files in the specified directory are scanned. The other functions assume that the server has started.

Options:

- `{start_log, FileName}` - Starts logging to file, registered name, or `io_device`. All reports are printed to the specified destination. Default is `standard_io`. Option `{start_log, standard_error}` is not allowed and will be replaced by default `standard_io`.

- `{max, MaxNoOfReports}` - Controls how many reports `rb_server` is to read at startup. This option is useful, as the directory can contain a large amount of reports. If this option is specified, the `MaxNoOfReports` latest reports are read. Default is `all`.

- `{report_dir, DirString}` - Defines the directory where the error log files are located. Default is the directory specified by application environment variable `error_logger_mf_dir`, see sasl(6).

- `{type, ReportType}` - Controls what kind of reports `rb_server` is to read at startup. `ReportType` is a supported type, `all`, or a list of supported types. Default is `all`.

- `{abort_on_error, Bool}` - Specifies if logging is to be ended if `rb` encounters an unprintable report. (You can get a report with an incorrect form if function `error_logger`, `error_msg`, or `info_msg` has been called with an invalid format string)

  - If `Bool` is `true`, `rb` stops logging (and prints an error message to `stdout`) if it encounters a badly formatted report. If logging to file is enabled, an error message is appended to the log file as well.
  - If `Bool` is `false` (the default value), `rb` prints an error message to `stdout` for every bad report it encounters, but the logging process is never ended. All printable reports are written. If logging to file is enabled, `rb` prints `* UNPRINTABLE REPORT *` in the log file at the location of an unprintable report.

# start_log(FileName)

    -spec start_log(FileName) -> term() when FileName :: string() | atom() | pid().

Redirects all report output from the RB tool to the specified file, registered name, or `io_device`.

# stop()

    -spec stop() -> term().

Stops `rb_server`.

# stop_log()

    -spec stop_log() -> term().

Closes the log file. The output from the RB tool is directed to `standard_io`.