Changelog

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All notable changes to this project are documented here. The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

Unreleased

0.6.0 - 2026-06-04

Added

  • CDPEx.classify_error/1 and CDPEx.transient?/1 — classify any {:error, reason} CDPEx returns as :transient (a fresh attempt may succeed — connection dropped or couldn't be established, timeout, Chrome died or was slow to start, an internal helper crashed, or a connection-layer net::ERR_* navigation failure such as ERR_CONNECTION_REFUSED / ERR_TIMED_OUT), :terminal (deterministic — selector miss, JS exception, usage/validation error, missing Chrome binary), or :unknown (payload- or timing-dependent — an ambiguous net::ERR_* navigation error such as DNS / blocked / aborted, a CDP error code, or a no-document navigation — you decide). The library owns the transient/terminal decision and tracks the error surface as it evolves, so retry logic isn't reimplemented (and re-drifted) in every caller. The return type is the named CDPEx.error_classification/0. See the "Error handling" section of the CDPEx docs (#56). Consumer note: transient?/1 treats :unknown as not transient (conservative); retries remain the caller's responsibility (bound attempts, back off, and re-establish the resource — don't retry a dead handle).
  • CDPEx.error_reason/0 reconciled with what the public ops actually return: added {:capture_failed, _} / {:idle_wait_failed, _} (helper crashes from navigate/3 response: true and wait_for_network_idle/2, returned since 0.5.0) and {:ws_connect, _} / {:ws_upgrade, _} (browser-socket connect/upgrade failures from launch/1 and new_page/2) — all previously missing from the aggregate type. No runtime change. A compile-time coverage test now fails if any error_reason/0 member lacks a classify_error/1 exemplar, so a documented member can't be added to the type without being classified (the reverse direction — an error the code produces but never adds to the type — stays a review responsibility) (#56).

0.5.0 - 2026-06-04

Changed

  • CDPEx.Pool now launches browsers asynchronously. A cold Chrome start used to run synchronously inside the pool process, blocking every other checkout, checkin, and timeout for its duration (a few seconds), so a short :checkout_timeout was unreliable while the pool grew to :size. Each launch now runs in its own task: the pool stays responsive during warmup, launches for simultaneous waiters run concurrently, and :checkout_timeout is honored even mid-launch. Behavior is otherwise unchanged — count + in-flight launches never exceeds :size, a launch failure surfaces to the caller, and a launched browser is adopted (re-linked) by the pool so its crash handling and terminate reaping are preserved (#22).

Fixed

  • CDPEx.Page.navigate/3 with response: true no longer disturbs a same-process observe_network/2 subscription. The document-response capture now runs in a short-lived, isolated helper process with its own Network.responseReceived subscription and mailbox, so a caller that is also observing the network on the same page keeps its subscription and its buffered events intact (previously the navigation unsubscribed the caller and drained those events). Cross-process observation was already unaffected (#42).
  • CDPEx.Page.wait_for_network_idle/2 no longer disturbs a same-process observe_network/2 subscription — the same fix as #42 applied to the idle wait. The in-flight tracking now runs in an isolated helper process, so a caller observing the network on the same page keeps its subscription and buffered events intact (previously the idle wait tore down the overlapping request-lifecycle subscriptions and drained those events). An abnormal crash of the internal helper surfaces as {:error, {:idle_wait_failed, reason}} (#48).
  • CDPEx.Page.authenticate/4 no longer leaves a page stuck on {:error, :already_authenticated} when its caller times out. If the 15s call deadline elapses during a slow arm (severe scheduler starvation), the caller used to depart while the page stayed armed with no way to recover but closing it. The CDPEx.Browser now monitors the authenticating caller and, on its departure, cancels the orphaned Fetch handler — which disables Fetch (releasing any paused request) and stops, clearing the page's auth entry so it can be authenticated again (#40).
  • CDPEx.Page.navigate/3 and wait_for_navigation/2 now treat :timeout as a true overall ceiling. Previously the lazy Network.enable and the event subscription each drew from a fresh budget on top of the navigation wait, so a slow connection could block well past :timeout (worst case ~2×). One absolute deadline now spans enable + subscribe + navigate + the readiness/capture wait — matching wait_for_response/3 and wait_for_network_idle/2. CDPEx.Connection.subscribe/3 gained an optional timeout so the subscription can be folded into that deadline, and the internal capture/idle helper enforces the deadline with a force-kill backstop (#49).

0.4.0 - 2026-06-04

Added

  • CDPEx.Page.navigate/3 accepts response: true to return {:ok, page, %{status, url}} — the main document's HTTP status and final (post-redirect) URL, correlated to the navigation by its loaderId. Lets callers detect a 403 wall / 404 / login-redirect instead of treating every navigation as success. Lazily enables the Network domain; returns {:error, {:no_document_response, url}} when no document response arrives (#31).
  • CDPEx.Page.wait_for_response/3 blocks until a network response whose URL matches a function / Regex / substring arrives, returning the Network.responseReceived params (HTTP status + requestId for a follow-up response_body/3) — for an XHR/fetch kicked off by a click/3 (#32).
  • CDPEx.Page.wait_for_network_idle/2 blocks until the network is idle (≤ :max_inflight in-flight requests for :idle_time ms continuously) — the Puppeteer "networkidle" primitive for waiting out SPA hydration (#32).
  • :telemetry instrumentation — CDPEx emits launch + navigate spans, page open/close events, and error events (Chrome exit, browser-connection down, WebSocket close). Silent by default (no handlers attached); see CDPEx.Telemetry for the event taxonomy. Adds a {:telemetry, "~> 1.2"} dependency (#33).

Breaking

  • CDPEx.Connection.await_event/4 now returns {:ok, params} (the matched event's params) on a match, instead of a bare :ok (#32).
  • Request interception ↔ authenticate/4 mutual exclusion is now enforced (it previously failed silently — returning a misleading :ok while breaking the page, since both drive the Fetch domain). On the same page: enable_request_interception/2 returns {:error, {:conflict, :authenticated}} when the page is authenticated, authenticate/4 returns {:error, {:conflict, :intercepting}} when it's intercepting, and re-enabling interception returns {:error, :already_intercepting} (was :ok). Interception also now rejects a :session-transport page with {:error, {:unsupported_transport, :session}}, matching authenticate/4. Update any caller that only matched :ok on these paths (#30).

Fixed

  • CDPEx.Page request interception no longer bricks the page when its owner dies: CDPEx.Browser now monitors the process that called enable_request_interception/2 and auto-Fetch.disables the page (off the Browser process, so a hung connection can't stall other pages) if that process exits without disabling — a crashed or forgetful caller can't leave every request paused with no resolver (#30).
  • CDPEx.Page.authenticate/4 no longer blocks the CDPEx.Browser GenServer for the duration of Fetch.enable: the per-page Fetch handler now arms asynchronously and signals readiness, so the browser keeps serving other pages while a page authenticates. authenticate/4 still returns only once interception is armed, preserving the "armed before navigate/3" guarantee (#36).
  • Compiles cleanly on Elixir 1.20 under --warnings-as-errors (dropped an unused require; pinned bitstring sizes in the test WebSocket parser). CI now covers Elixir 1.15 / 1.19 / 1.20.

0.3.0 - 2026-06-03

Added

  • CDPEx.Pool — a fixed-size pool of reusable browsers (checkout/2, checkin/2, with_browser/3, with_page/3) that keeps Chrome warm so a per-job fetch avoids a cold launch. Lazy launch up to :size, blocking checkout with timeout, automatic reclaim of a crashed caller's browser, and on-demand relaunch of a crashed one.
  • CDPEx.Page.observe_network/2, stop_observing_network/2, and response_body/3 — observe a page's network traffic (subscribe the caller to Network.requestWillBeSent / responseReceived events) and fetch a response body by requestId. Builds on the existing event-subscription machinery and the lazy Network.enable.
  • CDPEx.Page.authenticate/4 — answer proxy (--proxy-server) or HTTP Basic auth challenges with credentials, so authenticated proxies and Basic-auth-gated origins work. Backed by a per-page CDPEx.Fetch handler that enables the Fetch domain, auto-continues paused requests, and answers authRequired (with a :source filter and a bad-credentials loop guard). Supported on :dedicated pages only — a :session page returns {:error, {:unsupported_transport, :session}} (its handler would outlive the shared connection); an unknown :source returns {:error, {:invalid_source, value}}. Authenticating a page from another browser (or an already-closed one) returns {:error, :unknown_page}, and re-arming an already-authenticated page returns {:error, :already_authenticated}.
  • CDPEx.Page request interception — enable_request_interception/2 / disable_request_interception/2 pause matching requests (delivering Fetch.requestPaused to the calling process), each resolved with continue_request/3 (optionally rewriting url/method/headers/post-data), fulfill_request/3 (a synthetic response), or fail_request/3 (an error reason; unknown reasons return {:error, {:invalid_error_reason, value}}). Event-driven like observe_network/2; mutually exclusive with authenticate/4 per page (both drive the Fetch domain).
  • CDPEx.error_reason/0 — a documented (best-effort) type of the {:error, reason} shapes CDPEx returns, so consumers know which tagged kinds to match. Not closed/exhaustive — kinds like {:cdp_error, method, payload} wrap open data.

Breaking

  • Error-reason shapes normalized toward tagged tuples (#20). A reason shape is a public contract — a matcher on the old bare atom silently falls through its catch-all with no compile/Dialyzer warning, so update any matchers:
    • CDPEx.Connection.await_event/4 timeout: {:error, :timeout} → {:error, {:timeout, :await_event}}, sharing the {:timeout, _} shape with call/5's {:timeout, method}.
    • A malformed DevToolsActivePort at launch: {:error, :devtools_file_malformed} → {:error, {:devtools_file_malformed, excerpt}}, carrying the file's contents excerpt like its sibling {:debug_url_not_found, _}.
    • Base64 validation failures now carry the offending data: CDPEx.Page.response_body/3 returns {:error, {:invalid_response_body, excerpt}} (was :invalid_response_body), CDPEx.Page.pdf/2 returns {:error, {:invalid_pdf_data, excerpt}} (was :invalid_pdf_data), and CDPEx.Page.screenshot/2 returns {:error, {:invalid_screenshot_data, excerpt}} (was :invalid_screenshot_data) when Chrome sends a body / PDF / screenshot that isn't decodable base64.
    • Unchanged (still bare, intentional): :noproc; the high-level "didn't happen in time" :timeout from CDPEx.Page wait_for_* and CDPEx.Pool.checkout/2; and the control-flow outcomes :unknown_page / :already_authenticated — self-describing states with no payload to carry.

Changed

Fixed

  • CDPEx.Page.wait_for_navigation/2 now waits via the same lifecycle machinery as navigate/3 (subscribe-before-wait, scoped to the page's session and the Page.lifecycleEvent method) rather than a generic event matcher — so it can no longer be falsely resolved by another event method whose params happen to carry a matching "name".

0.2.2 - 2026-06-02

Added

  • Documented :launch_timeout as a ceiling (not a fixed wait) on CDPEx.launch/1 and CDPEx.with_page/3, plus a "Running in containers" README section (timeout tuning, the fresh-profile cold-start cost, /dev/shm sizing, --remote-allow-origins).

Changed

  • Chrome readiness is now polled: CDPEx.Chrome checks the DevToolsActivePort file throughout the wait (not only at the deadline), so launch returns as soon as Chrome is reachable and :launch_timeout acts as a ceiling rather than a fixed cost — robust to Chrome builds that don't print the DevTools listening on ws://… stderr line.
  • A launch that never exposes the DevTools endpoint now returns {:error, {:debug_url_not_found, stderr_excerpt}} (was the bare atom :debug_url_not_found), carrying Chrome's captured stderr so the failure is self-diagnosing. Migration: code matching the bare :debug_url_not_found atom (e.g. a retry classifier) must match {:debug_url_not_found, _} instead, or that error silently stops matching.
  • CDPEx.with_page/3, given launch options, now contains a throwaway-browser crash: it returns {:error, reason} instead of letting the browser's linked exit propagate to and kill the caller. It briefly traps exits in the calling process for the duration of the call (see the with_page/3 docs for the foreign-EXIT caveat and escape hatch).

Fixed

  • CDPEx.Connection no longer ignores an owning-process exit that arrives during the WebSocket upgrade — it aborts the connect at once instead of lingering until the upgrade timeout.
  • CDPEx.Connection now stops when a WebSocket pong write fails (mirroring a failed command write), rather than continuing on a dead socket until the next command notices.
  • CDPEx.Page.navigate/3 prefers a just-arrived connection :DOWN over a best-effort readiness timeout when the two tie at the deadline, so a connection death surfaces as an error rather than a stale {:ok, page}.
  • CDPEx.Browser no longer leaks Chrome if the browser connection drops in the window between connecting and its first subscribe — the init-time exit is caught and Chrome is reaped.
  • CDPEx.Chrome launch-failure cleanup waits for the OS process to exit before removing the temp profile (matching stop/1), closing a kill/rm race.
  • CDPEx.Connection.call/5 and await_event/4 return the documented timeout tuple instead of crashing the caller if the outer GenServer.call deadline fires first under scheduler starvation.
  • CDPEx.Connection accumulates WebSocket upgrade headers across response chunks instead of replacing them (defensive; dormant for single-response 101 upgrades).

0.2.1 - 2026-06-02

Changed

  • CDPEx.Browser sets shutdown: 10_000 in child_spec/1 so a supervisor gives terminate/2 enough time to reap Chrome.

Fixed

  • CDPEx.Protocol.parse_ws_url/1 parses IPv6 hosts and raises a clear ArgumentError on a malformed URL (previously a MatchError).
  • CDPEx.Connection no longer crashes when call/5 / await_event/4 is given a negative timeout (it fires immediately).
  • CDPEx.Connection teardown fails in-flight callers with {:error, {:ws_closed, _}} instead of {:error, :noproc} on close/1.
  • CDPEx.Page.navigate/3 subscribes to lifecycle events before issuing the navigate, so a fast readiness event (e.g. load on a cached/local page) can no longer be dropped — a register-after-navigate race.

0.2.0 - 2026-06-02

Added

Changed

  • A clean browser-connection close (its socket dropping, e.g. Chrome exiting) now stops CDPEx.Browser with a :shutdown reason rather than a crash reason — no spurious error report on expected teardown. Abnormal connection failures still surface loudly.

Fixed

  • CDPEx.Connection.call/5 and await_event/4 no longer crash the connection when given an :infinity timeout (which is valid per the timeout() spec).
  • CDPEx.Connection now stops when its owning process exits, closing the socket even if the owner skipped its own teardown (e.g. a :brutal_kill).

0.1.0 - 2026-06-01

Added