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| 1 | +# This file was auto-generated by Fern from our API Definition. |
| 2 | + |
| 3 | +from __future__ import annotations |
| 4 | + |
| 5 | +from dataclasses import dataclass |
| 6 | +from typing import AsyncIterator, Awaitable, Callable, Generic, Iterator, List, Optional, TypeVar |
| 7 | + |
| 8 | +from .http_response import BaseHttpResponse |
| 9 | + |
| 10 | +# Generic to represent the underlying type of the results within a page |
| 11 | +T = TypeVar("T") |
| 12 | + |
| 13 | + |
| 14 | +# SDKs implement a Page ABC per-pagination request, the endpoint then returns a pager that wraps this type |
| 15 | +# for example, an endpoint will return SyncPager[UserPage] where UserPage implements the Page ABC. ex: |
| 16 | +# |
| 17 | +# SyncPager<InnerListType>( |
| 18 | +# has_next=response.list_metadata.after is not None, |
| 19 | +# items=response.data, |
| 20 | +# # This should be the outer function that returns the SyncPager again |
| 21 | +# get_next=lambda: list(..., cursor: response.cursor) (or list(..., offset: offset + 1)) |
| 22 | +# ) |
| 23 | + |
| 24 | + |
| 25 | +@dataclass(frozen=True) |
| 26 | +class SyncPager(Generic[T]): |
| 27 | + get_next: Optional[Callable[[], Optional[SyncPager[T]]]] |
| 28 | + has_next: bool |
| 29 | + items: Optional[List[T]] |
| 30 | + response: Optional[BaseHttpResponse] |
| 31 | + |
| 32 | + # Here we type ignore the iterator to avoid a mypy error |
| 33 | + # caused by the type conflict with Pydanitc's __iter__ method |
| 34 | + # brought in by extending the base model |
| 35 | + def __iter__(self) -> Iterator[T]: # type: ignore[override] |
| 36 | + for page in self.iter_pages(): |
| 37 | + if page.items is not None: |
| 38 | + yield from page.items |
| 39 | + |
| 40 | + def iter_pages(self) -> Iterator[SyncPager[T]]: |
| 41 | + page: Optional[SyncPager[T]] = self |
| 42 | + while page is not None: |
| 43 | + yield page |
| 44 | + |
| 45 | + if not page.has_next or page.get_next is None: |
| 46 | + return |
| 47 | + |
| 48 | + page = page.get_next() |
| 49 | + if page is None or page.items is None or len(page.items) == 0: |
| 50 | + return |
| 51 | + |
| 52 | + def next_page(self) -> Optional[SyncPager[T]]: |
| 53 | + return self.get_next() if self.get_next is not None else None |
| 54 | + |
| 55 | + |
| 56 | +@dataclass(frozen=True) |
| 57 | +class AsyncPager(Generic[T]): |
| 58 | + get_next: Optional[Callable[[], Awaitable[Optional[AsyncPager[T]]]]] |
| 59 | + has_next: bool |
| 60 | + items: Optional[List[T]] |
| 61 | + response: Optional[BaseHttpResponse] |
| 62 | + |
| 63 | + async def __aiter__(self) -> AsyncIterator[T]: |
| 64 | + async for page in self.iter_pages(): |
| 65 | + if page.items is not None: |
| 66 | + for item in page.items: |
| 67 | + yield item |
| 68 | + |
| 69 | + async def iter_pages(self) -> AsyncIterator[AsyncPager[T]]: |
| 70 | + page: Optional[AsyncPager[T]] = self |
| 71 | + while page is not None: |
| 72 | + yield page |
| 73 | + |
| 74 | + if not page.has_next or page.get_next is None: |
| 75 | + return |
| 76 | + |
| 77 | + page = await page.get_next() |
| 78 | + if page is None or page.items is None or len(page.items) == 0: |
| 79 | + return |
| 80 | + |
| 81 | + async def next_page(self) -> Optional[AsyncPager[T]]: |
| 82 | + return await self.get_next() if self.get_next is not None else None |
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