first

2026-06-18 11:58:23 +02:00
parent 284e013753
commit 6934f22253
18 changed files with 1367 additions and 17 deletions
@@ -0,0 +1,193 @@
+"""Sklik (Seznam) "Drak" JSON API client.
+
+Protocol (verified against the official seznam/api-examples JSON example):
+  * Endpoint: ``{SKLIK_BASE_URL}/{method}`` e.g. .../drak/json/v5/campaigns.list
+  * HTTP POST, body = a JSON ARRAY of positional arguments.
+  * ``client.loginByToken`` takes the API token as its single argument and
+    returns ``{"status":200,"session":"...",...}``.
+  * Every authenticated method takes the user struct ``{"session": ...}``
+    (optionally ``"userId"``) as its FIRST argument, followed by the method's
+    own arguments.
+  * Every response is an object containing ``status`` (HTTP-style int),
+    ``statusMessage``, a refreshed ``session``, plus method-specific data.
+
+The proxy is stateless: it logs in with ``X-Sklik-Token`` per request to obtain
+a session, then performs the requested call. The token and session are never
+logged.
+"""
+from __future__ import annotations
+
+from typing import Any
+
+import httpx
+
+from .. import config
+from ..errors import UpstreamError
+from ..logging_config import get_logger
+
+logger = get_logger(__name__)
+
+# Sklik report data is paginated; readReport is called with an offset/limit
+# window until all rows are fetched. Keep the page size conservative.
+_REPORT_PAGE_LIMIT = 100
+# Hard stop so a misbehaving upstream can't loop forever.
+_REPORT_MAX_PAGES = 1000
+
+
+class SklikClient:
+    """Performs JSON-RPC calls against the Sklik Drak API."""
+
+    def __init__(self, token: str, user_id: int | None = None) -> None:
+        self._token = token
+        self._user_id = user_id
+        self._session: str | None = None
+
+    async def __aenter__(self) -> "SklikClient":
+        self._http = httpx.AsyncClient(timeout=config.HTTP_TIMEOUT_SECONDS)
+        return self
+
+    async def __aexit__(self, *exc: Any) -> None:
+        await self._http.aclose()
+
+    async def _call(self, method: str, args: list[Any]) -> dict:
+        """Low-level: POST a JSON array of args to ``/{method}``."""
+        url = f"{config.SKLIK_BASE_URL}/{method}"
+        try:
+            resp = await self._http.post(url, json=args)
+        except httpx.TimeoutException as exc:
+            raise UpstreamError(
+                f"Sklik request timed out ({method}).", status=504
+            ) from exc
+        except httpx.HTTPError as exc:
+            raise UpstreamError(
+                f"Sklik is unreachable ({method}): {exc}", status=502
+            ) from exc
+
+        try:
+            payload = resp.json()
+        except ValueError as exc:
+            raise UpstreamError(
+                f"Sklik returned a non-JSON response ({method}).",
+                status=502,
+                upstream_status=resp.status_code,
+                body={"raw": resp.text},
+            ) from exc
+
+        if not isinstance(payload, dict):
+            raise UpstreamError(
+                f"Unexpected Sklik response shape ({method}).",
+                status=502,
+                body=payload,
+            )
+
+        status = payload.get("status")
+        # Sklik conveys business errors in the body with an HTTP-style status.
+        # 200 OK, 206 partially OK, 301 "user is serviced" are all acceptable.
+        if status not in (200, 206, 301):
+            raise UpstreamError(
+                payload.get("statusMessage", f"Sklik error on {method}."),
+                status=400 if isinstance(status, int) and 400 <= status < 500 else 502,
+                upstream_status=status if isinstance(status, int) else None,
+                body=payload,
+            )
+
+        # Refresh our session from every response (Sklik rotates it).
+        new_session = payload.get("session")
+        if isinstance(new_session, str) and new_session:
+            self._session = new_session
+        return payload
+
+    async def login(self) -> dict:
+        """Exchange the API token for a session. Idempotent per client."""
+        payload = await self._call("client.loginByToken", [self._token])
+        if not self._session:
+            raise UpstreamError(
+                "Sklik login succeeded but returned no session.",
+                status=502,
+                body=payload,
+            )
+        return payload
+
+    def _user_struct(self) -> dict:
+        user: dict[str, Any] = {"session": self._session}
+        if self._user_id is not None:
+            user["userId"] = self._user_id
+        return user
+
+    async def call(self, method: str, args: list[Any] | None = None) -> dict:
+        """Authenticated call: prepends the user/session struct to ``args``.
+
+        Logs in first if no session is held yet. ``method`` is e.g.
+        ``campaigns.list``; ``args`` are the method arguments AFTER the user
+        struct.
+        """
+        if method == "client.loginByToken":
+            # Login is handled by login(); never forward the bare token here.
+            raise UpstreamError(
+                "client.loginByToken cannot be called directly; the proxy "
+                "manages the session.",
+                status=400,
+            )
+        if not self._session:
+            await self.login()
+        full_args = [self._user_struct()] + list(args or [])
+        return await self._call(method, full_args)
+
+    async def fetch_report(
+        self, entity: str, report_args: list[Any]
+    ) -> dict:
+        """Create a stats report for ``entity`` then read all of its rows.
+
+        ``entity`` is e.g. ``campaigns``/``groups``/``ads``/``keywords``.
+        Calls ``{entity}.createReport`` with ``report_args`` (the restriction +
+        display-options structs), then pages through ``{entity}.readReport``
+        until every row is collected.
+        """
+        created = await self.call(f"{entity}.createReport", report_args)
+        report_id = created.get("reportId")
+        if not report_id:
+            raise UpstreamError(
+                f"{entity}.createReport returned no reportId.",
+                status=502,
+                body=created,
+            )
+        total = created.get("totalCount", 0)
+
+        rows: list[Any] = []
+        offset = 0
+        pages = 0
+        while True:
+            page = await self.call(
+                f"{entity}.readReport",
+                [
+                    report_id,
+                    {
+                        "offset": offset,
+                        "limit": _REPORT_PAGE_LIMIT,
+                        "allowEmptyStatistics": False,
+                    },
+                ],
+            )
+            batch = page.get("report") or []
+            rows.extend(batch)
+            pages += 1
+            offset += _REPORT_PAGE_LIMIT
+            if len(batch) < _REPORT_PAGE_LIMIT:
+                break
+            if pages >= _REPORT_MAX_PAGES:
+                logger.warning(
+                    "Sklik %s.readReport hit the %d-page safety cap (collected "
+                    "%d rows); result may be truncated.",
+                    entity,
+                    _REPORT_MAX_PAGES,
+                    len(rows),
+                )
+                break
+
+        return {
+            "reportId": report_id,
+            "totalCount": total,
+            "returnedCount": len(rows),
+            "truncated": pages >= _REPORT_MAX_PAGES,
+            "report": rows,
+        }