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credo
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A static code analysis tool with a focus on code consistency and teaching.
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lib/credo/check/warning/raise_inside_rescue.ex
defmodule Credo.Check.Warning.RaiseInsideRescue do
@moduledoc false
@checkdoc """
Using `Kernel.raise` inside of a `rescue` block creates a new stacktrace,
which obscures the cause of the original error.
Example:
# preferred
try do
raise "oops"
rescue
error ->
Logger.warn("An exception has occurred")
reraise error, System.stacktrace
end
# NOT preferred
try do
raise "oops"
rescue
error ->
Logger.warn("An exception has occurred")
raise error
end
"""
@explanation [check: @checkdoc]
@def_ops [:def, :defp, :defmacro, :defmacrop]
use Credo.Check
alias Credo.Code.Block
@doc false
def run(source_file, params \\ []) do
issue_meta = IssueMeta.for(source_file, params)
Credo.Code.prewalk(source_file, &traverse(&1, &2, issue_meta))
end
defp traverse({:try, _meta, _arguments} = ast, issues, issue_meta) do
case Block.rescue_block_for(ast) do
{:ok, ast} ->
issues_found = Credo.Code.prewalk(ast, &find_issues(&1, &2, issue_meta))
{ast, issues ++ issues_found}
_ ->
{ast, issues}
end
end
defp traverse(
{op, _meta, [_def, [do: _do, rescue: rescue_block]]},
issues,
issue_meta
)
when op in @def_ops do
issues_found = Credo.Code.prewalk(rescue_block, &find_issues(&1, &2, issue_meta))
{rescue_block, issues ++ issues_found}
end
defp traverse(ast, issues, _issue_meta), do: {ast, issues}
defp find_issues({:raise, meta, _arguments} = ast, issues, issue_meta) do
issue = issue_for(issue_meta, meta[:line])
{ast, issues ++ [issue]}
end
defp find_issues(ast, issues, _), do: {ast, issues}
defp issue_for(issue_meta, line_no) do
format_issue(
issue_meta,
message: "Use `reraise` inside a rescue block to preserve the original stacktrace.",
trigger: "raise",
line_no: line_no
)
end
end