100 lines
4.1 KiB
Python
100 lines
4.1 KiB
Python
import asyncio, warnings
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class BaseNode:
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def __init__(self): self.params, self.successors = {}, {}
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def set_params(self, params): self.params = params
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def add_successor(self, node, cond="default"):
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if cond in self.successors: warnings.warn(f"Overwriting existing successor for '{cond}'")
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self.successors[cond] = node; return node
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def preprocess(self, s): return None
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def process(self, s, p): return None
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def _process(self, s, p): return self.process(s, p)
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def postprocess(self, s, pr, r): return "default"
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def _run(self, s):
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pr = self.preprocess(s)
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r = self._process(s, pr)
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return self.postprocess(s, pr, r)
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def run(self, s):
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if self.successors: warnings.warn("Has successors; use Flow.run() instead.")
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return self._run(s)
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def __rshift__(self, other): return self.add_successor(other)
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def __sub__(self, cond):
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if isinstance(cond, str): return _ConditionalTransition(self, cond)
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raise TypeError("Condition must be a string")
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class _ConditionalTransition:
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def __init__(self, src, c): self.src, self.c = src, c
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def __rshift__(self, tgt): return self.src.add_successor(tgt, self.c)
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class Node(BaseNode):
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def __init__(self, max_retries=1): super().__init__(); self.max_retries = max_retries
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def process_after_fail(self, s, d, e): raise e
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def _process(self, s, d):
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for i in range(self.max_retries):
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try: return super()._process(s, d)
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except Exception as e:
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if i == self.max_retries - 1: return self.process_after_fail(s, d, e)
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class BatchNode(Node):
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def preprocess(self, s): return []
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def process(self, s, item): return None
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def _process(self, s, items): return [super(Node, self)._process(s, i) for i in items]
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class BaseFlow(BaseNode):
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def __init__(self, start_node): super().__init__(); self.start_node = start_node
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def get_next_node(self, curr, c):
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nxt = curr.successors.get(c)
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if nxt is None and curr.successors: warnings.warn(f"Flow ends. '{c}' not found in {list(curr.successors.keys())}")
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return nxt
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class Flow(BaseFlow):
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def _process(self, s, p=None):
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curr, p = self.start_node, (p if p is not None else self.params.copy())
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while curr:
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curr.set_params(p)
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c = curr._run(s)
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curr = self.get_next_node(curr, c)
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def process(self, s, pr): raise NotImplementedError("Use Flow._process(...) instead")
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class BaseBatchFlow(BaseFlow):
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def preprocess(self, s): return []
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class BatchFlow(BaseBatchFlow, Flow):
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def _run(self, s):
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pr = self.preprocess(s)
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for d in pr:
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mp = self.params.copy(); mp.update(d)
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self._process(s, mp)
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return self.postprocess(s, pr, None)
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class AsyncNode(Node):
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def postprocess(self, s, pr, r): raise NotImplementedError("Use postprocess_async")
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async def postprocess_async(self, s, pr, r): await asyncio.sleep(0); return "default"
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async def run_async(self, s):
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if self.successors: warnings.warn("Has successors; use AsyncFlow.run_async() instead.")
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return await self._run_async(s)
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async def _run_async(self, s):
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pr = self.preprocess(s)
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r = self._process(s, pr)
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return await self.postprocess_async(s, pr, r)
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def _run(self, s): raise RuntimeError("AsyncNode requires async execution")
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class AsyncFlow(BaseFlow, AsyncNode):
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async def _process_async(self, s, p=None):
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curr, p = self.start_node, (p if p else self.params.copy())
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while curr:
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curr.set_params(p)
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c = await curr._run_async(s) if hasattr(curr, "run_async") else curr._run(s)
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curr = self.get_next_node(curr, c)
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async def _run_async(self, s):
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pr = self.preprocess(s)
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await self._process_async(s)
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return await self.postprocess_async(s, pr, None)
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class BatchAsyncFlow(BaseBatchFlow, AsyncFlow):
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async def _run_async(self, s):
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pr = self.preprocess(s)
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for d in pr:
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mp = self.params.copy(); mp.update(d)
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await self._process_async(s, mp)
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return await self.postprocess_async(s, pr, None) |