backtrace: add support for ExecJS backtraces

CHANGELOG.md

@@ -3,6 +3,9 @@ Airbrake Ruby Changelog
 
 ### master
 
+* Added support for CoffeeScript/ExecJS backtraces
+  ([#107](https://github.com/airbrake/airbrake-ruby/pull/107))
+
 ### [v1.4.4][v1.4.4] (July 11, 2016)
 
 * Added support for PL/SQL exceptions raised by

lib/airbrake-ruby/backtrace.rb

@@ -64,6 +64,22 @@ module Backtrace
       )
     \z/x
 
+    ##
+    # @return [Regexp] the template that matches CoffeeScript backtraces
+    #   usually coming from Rails & ExecJS
+    EXECJS_STACKFRAME_REGEXP = /\A
+      (?:
+        # Matches 'compile ((execjs):6692:19)'
+        (?<function>.+)\s\((?<file>.+):(?<line>\d+):\d+\)
+      |
+        # Matches 'bootstrap_node.js:467:3'
+        (?<file>.+):(?<line>\d+):\d+(?<function>)
+      |
+        # Matches the Ruby part of the backtrace
+        #{RUBY_STACKFRAME_REGEXP}
+      )
+    \z/x
+
     ##
     # Parses an exception's backtrace.
     #
@@ -73,13 +89,7 @@ module Backtrace
     def self.parse(exception, logger)
       return [] if exception.backtrace.nil? || exception.backtrace.none?
 
-      regexp = if java_exception?(exception)
-                 JAVA_STACKFRAME_REGEXP
-               elsif oci_exception?(exception)
-                 OCI_STACKFRAME_REGEXP
-               else
-                 RUBY_STACKFRAME_REGEXP
-               end
+      regexp = best_regexp_for(exception)
 
       exception.backtrace.map do |stackframe|
         frame = match_frame(regexp, stackframe)
@@ -109,10 +119,30 @@ def self.java_exception?(exception)
     class << self
       private
 
+      def best_regexp_for(exception)
+        if java_exception?(exception)
+          JAVA_STACKFRAME_REGEXP
+        elsif oci_exception?(exception)
+          OCI_STACKFRAME_REGEXP
+        elsif execjs_exception?(exception)
+          EXECJS_STACKFRAME_REGEXP
+        else
+          RUBY_STACKFRAME_REGEXP
+        end
+      end
+
       def oci_exception?(exception)
         defined?(OCIError) && exception.is_a?(OCIError)
       end
 
+      def execjs_exception?(exception)
+        return false unless defined?(ExecJS::RuntimeError)
+        return true if exception.is_a?(ExecJS::RuntimeError)
+        return true if exception.cause && exception.cause.is_a?(ExecJS::RuntimeError)
+
+        false
+      end
+
       def stack_frame(match)
         { file: match[:file],
           line: (Integer(match[:line]) if match[:line]),

spec/backtrace_spec.rb

@@ -190,5 +190,40 @@
         ).to eq(parsed_backtrace)
       end
     end
+
+    context "given an ExecJS backtrace" do
+      let(:bt) do
+        ['compile ((execjs):6692:19)',
+         'eval (<anonymous>:1:10)',
+         '(execjs):6703:8',
+         'require../helpers.exports ((execjs):1:102)',
+         'Object.<anonymous> ((execjs):1:120)',
+         'Object.Module._extensions..js (module.js:550:10)',
+         'bootstrap_node.js:467:3',
+         "/opt/rubies/ruby-2.3.1/lib/ruby/2.3.0/benchmark.rb:308:in `realtime'"]
+      end
+
+      let(:ex) { ExecJS::RuntimeError.new.tap { |e| e.set_backtrace(bt) } }
+
+      let(:parsed_backtrace) do
+        [{ file: '(execjs)', line: 6692, function: 'compile' },
+         { file: '<anonymous>', line: 1, function: 'eval' },
+         { file: '(execjs)', line: 6703, function: '' },
+         { file: '(execjs)', line: 1, function: 'require../helpers.exports' },
+         { file: '(execjs)', line: 1, function: 'Object.<anonymous>' },
+         { file: 'module.js', line: 550, function: 'Object.Module._extensions..js' },
+         { file: 'bootstrap_node.js', line: 467, function: '' },
+         { file: '/opt/rubies/ruby-2.3.1/lib/ruby/2.3.0/benchmark.rb',
+           line: 308,
+           function: 'realtime' }]
+      end
+
+      it "returns a properly formatted array of hashes" do
+        stub_const('ExecJS::RuntimeError', AirbrakeTestError)
+        expect(
+          described_class.parse(ex, Logger.new('/dev/null'))
+        ).to eq(parsed_backtrace)
+      end
+    end
   end
 end