get js logs

[igrishaev]

https://stackoverflow.com/questions/20907180/getting-console-log-output-from-chrome-with-selenium-python-api-bindings

[igrishaev]

https://github.com/bayandin/chromedriver/blob/master/client/command_executor.py#L148

[igrishaev]

webdriverio/webdriverio#476 (comment)

[igrishaev]

(def chrome (eta/chrome {:capabilities {:loggingPrefs {:browser "ALL"}}}))
          (eta/go chrome "https://codex.wordpress.org/Using_Your_Browser_to_Diagnose_JavaScript_Errors“)
          (client/call chrome :post [:session (:session @chrome) "log"]
                       {:type "browser"}) #_{:sessionId "5290da6788ac528d2f7d21550bf96111", :status 0, :value [{:level "SEVERE", :message "https://codex.wordpress.org/skins/common/wikibits.js 242:3 Uncaught ReferenceError: mediaWiki is not defined", :source "javascript", :timestamp 1508767605273}]}

[igrishaev]

more

(defn -get-browser-log
  "Retrieves browser log using unofficial WebDriver endpoint. Depends on :loggingPrefs WebDriver capability.

  Example return value:
    [{:level    \"WARNING\"
      :message  \"http://localhost:5000/js/compiled/frontend/out/app/core.js 17:8 \"App debug mode is ON.\"\"
      :source   \"console-api\"
      :timestamp 1494439209317} ,,,]

  Empirical knowledge about browser differences:
    Chrome:
      Returns all recorded logs.
      Clears log cache (so that the immediate subsequent invocation will return nothing).
      Entries about errors will have SEVERE level.

    PhantomJS:
      Return all recorded logs since the last URL change.
      Does not clear recorded logs on subsequent invocations.
      Entries about errors will have WARNING level, as coded here:
         https://github.com/detro/ghostdriver/blob/be7ffd9d47c1e76c7bfa1d47cdcde9164fd40db8/src/session.js#L494"
  [driver]
  (e/with-resp driver :post
               [:session (:session @driver) :log] {:type "browser"}
               response
               (:value response)))

[igrishaev]

; Chrome:
;   1) It doesn't always provide the full error message.
;   2) It treats all failed network requests as errors, even if they are handled by application (e.g. failed AJAX requests).
;
; PhantomJS:
;   1) Some JS errors can pass undetected because it stores log entries only since the last URL change.
;   2) It doesn't detect ex-info exceptions.
(defn -logged-errors
  "Parses the provided log and returns all non-network errors."
  [driver log]
  (assert (#{:chrome :phantom} (:type @driver)) (str "getting logs hasn't been checked for browser " (:type @driver)))
  (let [error-level (case (:type @driver)
                      :chrome "SEVERE"
                      :phantom "WARNING")
        all-errors (filter #(= (:level %) error-level) log)]
    (filter #(not= (:source %) "network") all-errors)))

[metametadata]

The default logging level seems to be WARNING in Chrome and PhantomJS. One can bump it via loggingPrefs:

(e/connect-driver d {:desired-capabilities {:loggingPrefs {:browser "INFO"}}})

[igrishaev]

@metametadata thank you, added in 0.2.1

[metametadata]

@igrishaev awesome!