mirror of
https://github.com/PostHog/posthog.git
synced 2024-11-28 09:16:49 +01:00
662 lines
29 KiB
Python
662 lines
29 KiB
Python
from datetime import timedelta
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import re
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import time
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from copy import deepcopy
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from typing import Any, Optional, TYPE_CHECKING
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from collections.abc import Callable
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from hogvm.python.debugger import debugger, color_bytecode
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from hogvm.python.objects import is_hog_error, new_hog_closure, CallFrame, ThrowFrame, new_hog_callable, is_hog_upvalue
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from hogvm.python.operation import Operation, HOGQL_BYTECODE_IDENTIFIER, HOGQL_BYTECODE_IDENTIFIER_V0
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from hogvm.python.stl import STL
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from hogvm.python.stl.bytecode import BYTECODE_STL
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from dataclasses import dataclass
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from hogvm.python.utils import (
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UncaughtHogVMException,
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HogVMException,
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get_nested_value,
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like,
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set_nested_value,
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calculate_cost,
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unify_comparison_types,
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)
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if TYPE_CHECKING:
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from posthog.models import Team
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MAX_MEMORY = 64 * 1024 * 1024 # 64 MB
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MAX_FUNCTION_ARGS_LENGTH = 300
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CALLSTACK_LENGTH = 1000
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@dataclass
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class BytecodeResult:
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result: Any
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bytecodes: dict[str, list[Any]]
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stdout: list[str]
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def execute_bytecode(
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input: list[Any] | dict,
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globals: Optional[dict[str, Any]] = None,
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functions: Optional[dict[str, Callable[..., Any]]] = None,
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timeout=timedelta(seconds=5),
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team: Optional["Team"] = None,
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debug=False,
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) -> BytecodeResult:
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bytecodes = input if isinstance(input, dict) else {"root": {"bytecode": input}}
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root_bytecode = bytecodes.get("root", {}).get("bytecode", []) or []
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if (
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not root_bytecode
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or len(root_bytecode) == 0
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or (root_bytecode[0] != HOGQL_BYTECODE_IDENTIFIER and root_bytecode[0] != HOGQL_BYTECODE_IDENTIFIER_V0)
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):
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raise HogVMException(f"Invalid bytecode. Must start with '{HOGQL_BYTECODE_IDENTIFIER}'")
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version = root_bytecode[1] if len(root_bytecode) >= 2 and root_bytecode[0] == HOGQL_BYTECODE_IDENTIFIER else 0
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start_time = time.time()
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last_op = len(root_bytecode) - 1
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stack: list = []
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upvalues: list[dict] = []
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upvalues_by_id: dict[int, dict] = {}
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mem_stack: list = []
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call_stack: list[CallFrame] = []
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throw_stack: list[ThrowFrame] = []
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declared_functions: dict[str, tuple[int, int]] = {}
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mem_used = 0
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max_mem_used = 0
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ops = 0
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stdout: list[str] = []
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debug_bytecode = []
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if isinstance(timeout, int):
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timeout = timedelta(seconds=timeout)
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if len(call_stack) == 0:
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call_stack.append(
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CallFrame(
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ip=0,
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chunk="root",
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stack_start=0,
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arg_len=0,
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closure=new_hog_closure(
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new_hog_callable(
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type="local",
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arg_count=0,
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upvalue_count=0,
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ip=0,
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chunk="root",
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name="",
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)
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),
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)
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)
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frame = call_stack[-1]
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chunk_bytecode: list[Any] = root_bytecode
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chunk_globals = globals
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def set_chunk_bytecode():
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nonlocal chunk_bytecode, chunk_globals, last_op, debug_bytecode
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if not frame.chunk or frame.chunk == "root":
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chunk_bytecode = root_bytecode
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chunk_globals = globals
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elif frame.chunk.startswith("stl/") and frame.chunk[4:] in BYTECODE_STL:
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chunk_bytecode = BYTECODE_STL[frame.chunk[4:]][1]
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chunk_globals = {}
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elif bytecodes.get(frame.chunk):
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chunk_bytecode = bytecodes[frame.chunk].get("bytecode", [])
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chunk_globals = bytecodes[frame.chunk].get("globals", {})
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else:
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raise HogVMException(f"Unknown chunk: {frame.chunk}")
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last_op = len(chunk_bytecode) - 1
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if debug:
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debug_bytecode = color_bytecode(chunk_bytecode)
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if frame.ip == 0 and (chunk_bytecode[0] == "_H" or chunk_bytecode[0] == "_h"):
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# TODO: store chunk version
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frame.ip += 2 if chunk_bytecode[0] == "_H" else 1
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set_chunk_bytecode()
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def stack_keep_first_elements(count: int) -> list[Any]:
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nonlocal stack, mem_stack, mem_used
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if count < 0 or len(stack) < count:
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raise HogVMException("Stack underflow")
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for upvalue in reversed(upvalues):
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if upvalue["location"] >= count:
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if not upvalue["closed"]:
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upvalue["closed"] = True
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upvalue["value"] = stack[upvalue["location"]]
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else:
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break
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removed = stack[count:]
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stack = stack[0:count]
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mem_used -= sum(mem_stack[count:])
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mem_stack = mem_stack[0:count]
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return removed
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def next_token():
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nonlocal frame, chunk_bytecode
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if frame.ip >= last_op:
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raise HogVMException("Unexpected end of bytecode")
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frame.ip += 1
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return chunk_bytecode[frame.ip]
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def pop_stack():
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if not stack:
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raise HogVMException("Stack underflow")
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nonlocal mem_used
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mem_used -= mem_stack.pop()
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return stack.pop()
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def push_stack(value):
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stack.append(value)
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mem_stack.append(calculate_cost(value))
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nonlocal mem_used
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mem_used += mem_stack[-1]
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nonlocal max_mem_used
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max_mem_used = max(mem_used, max_mem_used)
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if mem_used > MAX_MEMORY:
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raise HogVMException(f"Memory limit of {MAX_MEMORY} bytes exceeded. Tried to allocate {mem_used} bytes.")
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def check_timeout():
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if time.time() - start_time > timeout.total_seconds() and not debug:
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raise HogVMException(f"Execution timed out after {timeout.total_seconds()} seconds. Performed {ops} ops.")
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def capture_upvalue(index) -> dict:
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nonlocal upvalues
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for upvalue in reversed(upvalues):
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if upvalue["location"] < index:
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break
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if upvalue["location"] == index:
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return upvalue
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created_upvalue = {
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"__hogUpValue__": True,
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"location": index,
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"closed": False,
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"value": None,
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"id": len(upvalues) + 1,
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}
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upvalues.append(created_upvalue)
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upvalues_by_id[created_upvalue["id"]] = created_upvalue
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upvalues.sort(key=lambda x: x["location"])
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return created_upvalue
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symbol: Any = None
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while True:
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# Return or jump back to the previous call frame if ran out of bytecode to execute in this one, and return null
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if frame.ip > last_op:
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last_call_frame = call_stack.pop()
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if len(call_stack) == 0 or last_call_frame is None:
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if len(stack) > 1:
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raise HogVMException("Invalid bytecode. More than one value left on stack")
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return BytecodeResult(
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result=pop_stack() if len(stack) > 0 else None, stdout=stdout, bytecodes=bytecodes
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)
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stack_start = last_call_frame.stack_start
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stack_keep_first_elements(stack_start)
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push_stack(None)
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frame = call_stack[-1]
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set_chunk_bytecode()
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ops += 1
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symbol = chunk_bytecode[frame.ip]
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if (ops & 127) == 0: # every 128th operation
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check_timeout()
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elif debug:
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debugger(symbol, chunk_bytecode, debug_bytecode, frame.ip, stack, call_stack, throw_stack)
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match symbol:
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case None:
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break
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case Operation.STRING:
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push_stack(next_token())
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case Operation.INTEGER:
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push_stack(next_token())
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case Operation.FLOAT:
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push_stack(next_token())
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case Operation.TRUE:
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push_stack(True)
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case Operation.FALSE:
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push_stack(False)
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case Operation.NULL:
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push_stack(None)
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case Operation.NOT:
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push_stack(not pop_stack())
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case Operation.AND:
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push_stack(all([pop_stack() for _ in range(next_token())])) # noqa: C419
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case Operation.OR:
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push_stack(any([pop_stack() for _ in range(next_token())])) # noqa: C419
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case Operation.PLUS:
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push_stack(pop_stack() + pop_stack())
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case Operation.MINUS:
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push_stack(pop_stack() - pop_stack())
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case Operation.DIVIDE:
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push_stack(pop_stack() / pop_stack())
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case Operation.MULTIPLY:
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push_stack(pop_stack() * pop_stack())
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case Operation.MOD:
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push_stack(pop_stack() % pop_stack())
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case Operation.EQ:
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var1, var2 = unify_comparison_types(pop_stack(), pop_stack())
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push_stack(var1 == var2)
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case Operation.NOT_EQ:
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var1, var2 = unify_comparison_types(pop_stack(), pop_stack())
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push_stack(var1 != var2)
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case Operation.GT:
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var1, var2 = unify_comparison_types(pop_stack(), pop_stack())
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push_stack(var1 > var2)
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case Operation.GT_EQ:
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var1, var2 = unify_comparison_types(pop_stack(), pop_stack())
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push_stack(var1 >= var2)
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case Operation.LT:
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var1, var2 = unify_comparison_types(pop_stack(), pop_stack())
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push_stack(var1 < var2)
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case Operation.LT_EQ:
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var1, var2 = unify_comparison_types(pop_stack(), pop_stack())
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push_stack(var1 <= var2)
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case Operation.LIKE:
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push_stack(like(pop_stack(), pop_stack()))
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case Operation.ILIKE:
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push_stack(like(pop_stack(), pop_stack(), re.IGNORECASE))
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case Operation.NOT_LIKE:
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push_stack(not like(pop_stack(), pop_stack()))
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case Operation.NOT_ILIKE:
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push_stack(not like(pop_stack(), pop_stack(), re.IGNORECASE))
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case Operation.IN:
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push_stack(pop_stack() in pop_stack())
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case Operation.NOT_IN:
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push_stack(pop_stack() not in pop_stack())
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case Operation.REGEX:
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args = [pop_stack(), pop_stack()]
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# TODO: swap this for re2, as used in HogQL/ClickHouse and in the NodeJS VM
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push_stack(bool(re.search(re.compile(args[1]), args[0])))
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case Operation.NOT_REGEX:
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args = [pop_stack(), pop_stack()]
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# TODO: swap this for re2, as used in HogQL/ClickHouse and in the NodeJS VM
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push_stack(not bool(re.search(re.compile(args[1]), args[0])))
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case Operation.IREGEX:
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args = [pop_stack(), pop_stack()]
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push_stack(bool(re.search(re.compile(args[1], re.RegexFlag.IGNORECASE), args[0])))
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case Operation.NOT_IREGEX:
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args = [pop_stack(), pop_stack()]
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push_stack(not bool(re.search(re.compile(args[1], re.RegexFlag.IGNORECASE), args[0])))
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case Operation.GET_GLOBAL:
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chain = [pop_stack() for _ in range(next_token())]
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if chunk_globals and chain[0] in chunk_globals:
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push_stack(deepcopy(get_nested_value(chunk_globals, chain, True)))
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elif functions and chain[0] in functions:
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push_stack(
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new_hog_closure(
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new_hog_callable(
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type="stl",
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name=chain[0],
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arg_count=0,
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upvalue_count=0,
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ip=-1,
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chunk="stl",
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)
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)
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)
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elif chain[0] in STL and len(chain) == 1:
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push_stack(
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new_hog_closure(
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new_hog_callable(
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type="stl",
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name=chain[0],
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arg_count=STL[chain[0]].maxArgs or 0,
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upvalue_count=0,
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ip=-1,
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chunk="stl",
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)
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)
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)
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elif chain[0] in BYTECODE_STL and len(chain) == 1:
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push_stack(
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new_hog_closure(
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new_hog_callable(
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type="stl",
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name=chain[0],
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arg_count=len(BYTECODE_STL[chain[0]][0]),
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upvalue_count=0,
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ip=0,
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chunk=f"stl/{chain[0]}",
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)
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)
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)
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else:
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raise HogVMException(f"Global variable not found: {chain[0]}")
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case Operation.POP:
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pop_stack()
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case Operation.CLOSE_UPVALUE:
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stack_keep_first_elements(len(stack) - 1)
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case Operation.RETURN:
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response = pop_stack()
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last_call_frame = call_stack.pop()
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if len(call_stack) == 0 or last_call_frame is None:
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return BytecodeResult(result=response, stdout=stdout, bytecodes=bytecodes)
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stack_start = last_call_frame.stack_start
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stack_keep_first_elements(stack_start)
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push_stack(response)
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frame = call_stack[-1]
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set_chunk_bytecode()
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continue # resume the loop without incrementing frame.ip
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case Operation.GET_LOCAL:
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stack_start = 0 if not call_stack else call_stack[-1].stack_start
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push_stack(stack[next_token() + stack_start])
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case Operation.SET_LOCAL:
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stack_start = 0 if not call_stack else call_stack[-1].stack_start
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value = pop_stack()
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index = next_token() + stack_start
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stack[index] = value
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last_cost = mem_stack[index]
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mem_stack[index] = calculate_cost(value)
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mem_used += mem_stack[index] - last_cost
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max_mem_used = max(mem_used, max_mem_used)
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case Operation.GET_PROPERTY:
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property = pop_stack()
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push_stack(get_nested_value(pop_stack(), [property]))
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case Operation.GET_PROPERTY_NULLISH:
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property = pop_stack()
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push_stack(get_nested_value(pop_stack(), [property], nullish=True))
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case Operation.SET_PROPERTY:
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value = pop_stack()
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field = pop_stack()
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set_nested_value(pop_stack(), [field], value)
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case Operation.DICT:
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count = next_token()
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if count > 0:
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elems = stack[-(count * 2) :]
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stack = stack[: -(count * 2)]
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mem_used -= sum(mem_stack[-(count * 2) :])
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mem_stack = mem_stack[: -(count * 2)]
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push_stack({elems[i]: elems[i + 1] for i in range(0, len(elems), 2)})
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else:
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push_stack({})
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case Operation.ARRAY:
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count = next_token()
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if count > 0:
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elems = stack[-count:]
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stack = stack[:-count]
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mem_used -= sum(mem_stack[-count:])
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mem_stack = mem_stack[:-count]
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push_stack(elems)
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else:
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push_stack([])
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case Operation.TUPLE:
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count = next_token()
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if count > 0:
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elems = stack[-count:]
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stack = stack[:-count]
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mem_used -= sum(mem_stack[-count:])
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mem_stack = mem_stack[:-count]
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push_stack(tuple(elems))
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else:
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push_stack(())
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case Operation.JUMP:
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count = next_token()
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frame.ip += count
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case Operation.JUMP_IF_FALSE:
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count = next_token()
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if not pop_stack():
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frame.ip += count
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case Operation.JUMP_IF_STACK_NOT_NULL:
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count = next_token()
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if len(stack) > 0 and stack[-1] is not None:
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frame.ip += count
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case Operation.DECLARE_FN:
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# DEPRECATED
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name = next_token()
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arg_len = next_token()
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body_len = next_token()
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declared_functions[name] = (frame.ip + 1, arg_len)
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frame.ip += body_len
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case Operation.CALLABLE:
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name = next_token() # TODO: do we need it? it could change as the variable is reassigned
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arg_count = next_token()
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upvalue_count = next_token()
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body_length = next_token()
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push_stack(
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new_hog_callable(
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type="local",
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name=name,
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chunk=frame.chunk,
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arg_count=arg_count,
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upvalue_count=upvalue_count,
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ip=frame.ip + 1,
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)
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)
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frame.ip += body_length
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case Operation.CLOSURE:
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closure_callable = pop_stack()
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closure = new_hog_closure(closure_callable)
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stack_start = frame.stack_start
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upvalue_count = next_token()
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if upvalue_count != closure_callable["upvalueCount"]:
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raise HogVMException(
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f"Invalid upvalue count. Expected {closure_callable['upvalueCount']}, got {upvalue_count}"
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)
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for _ in range(closure_callable["upvalueCount"]):
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is_local, index = next_token(), next_token()
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if is_local:
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closure["upvalues"].append(capture_upvalue(stack_start + index)["id"])
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else:
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closure["upvalues"].append(frame.closure["upvalues"][index])
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push_stack(closure)
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case Operation.GET_UPVALUE:
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index = next_token()
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closure = frame.closure
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if index >= len(closure["upvalues"]):
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raise HogVMException(f"Invalid upvalue index: {index}")
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upvalue = upvalues_by_id[closure["upvalues"][index]]
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if not is_hog_upvalue(upvalue):
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raise HogVMException(f"Invalid upvalue: {upvalue}")
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if upvalue["closed"]:
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push_stack(upvalue["value"])
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else:
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push_stack(stack[upvalue["location"]])
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case Operation.SET_UPVALUE:
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index = next_token()
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closure = frame.closure
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if index >= len(closure["upvalues"]):
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raise HogVMException(f"Invalid upvalue index: {index}")
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upvalue = upvalues_by_id[closure["upvalues"][index]]
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if not is_hog_upvalue(upvalue):
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raise HogVMException(f"Invalid upvalue: {upvalue}")
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if upvalue["closed"]:
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upvalue["value"] = pop_stack()
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else:
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stack[upvalue["location"]] = pop_stack()
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case Operation.CALL_GLOBAL:
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check_timeout()
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name = next_token()
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arg_count = next_token()
|
|
# This is for backwards compatibility. We use a closure on the stack with local functions now.
|
|
if name in declared_functions:
|
|
func_ip, arg_len = declared_functions[name]
|
|
frame.ip += 1 # advance for when we return
|
|
if arg_len > arg_count:
|
|
for _ in range(arg_len - arg_count):
|
|
push_stack(None)
|
|
frame = CallFrame(
|
|
ip=func_ip,
|
|
chunk=frame.chunk,
|
|
stack_start=len(stack) - arg_len,
|
|
arg_len=arg_len,
|
|
closure=new_hog_closure(
|
|
new_hog_callable(
|
|
type="local",
|
|
name=name,
|
|
arg_count=arg_len,
|
|
upvalue_count=0,
|
|
ip=func_ip,
|
|
chunk=frame.chunk,
|
|
)
|
|
),
|
|
)
|
|
set_chunk_bytecode()
|
|
call_stack.append(frame)
|
|
continue # resume the loop without incrementing frame.ip
|
|
else:
|
|
if name == "import":
|
|
if arg_count != 1:
|
|
raise HogVMException("Function import requires exactly 1 argument")
|
|
module_name = pop_stack()
|
|
frame.ip += 1 # advance for when we return
|
|
frame = CallFrame(
|
|
ip=0,
|
|
chunk=module_name,
|
|
stack_start=len(stack),
|
|
arg_len=0,
|
|
closure=new_hog_closure(
|
|
new_hog_callable(
|
|
type="local",
|
|
name=module_name,
|
|
arg_count=0,
|
|
upvalue_count=0,
|
|
ip=0,
|
|
chunk=module_name,
|
|
)
|
|
),
|
|
)
|
|
set_chunk_bytecode()
|
|
call_stack.append(frame)
|
|
continue
|
|
elif functions is not None and name in functions:
|
|
if version == 0:
|
|
args = [pop_stack() for _ in range(arg_count)]
|
|
else:
|
|
args = stack_keep_first_elements(len(stack) - arg_count)
|
|
push_stack(functions[name](*args))
|
|
elif name in STL:
|
|
if version == 0:
|
|
args = [pop_stack() for _ in range(arg_count)]
|
|
else:
|
|
args = stack_keep_first_elements(len(stack) - arg_count)
|
|
push_stack(STL[name].fn(args, team, stdout, timeout.total_seconds()))
|
|
elif name in BYTECODE_STL:
|
|
arg_names = BYTECODE_STL[name][0]
|
|
if len(arg_names) != arg_count:
|
|
raise HogVMException(f"Function {name} requires exactly {len(arg_names)} arguments")
|
|
frame.ip += 1 # advance for when we return
|
|
frame = CallFrame(
|
|
ip=0,
|
|
chunk=f"stl/{name}",
|
|
stack_start=len(stack) - arg_count,
|
|
arg_len=arg_count,
|
|
closure=new_hog_closure(
|
|
new_hog_callable(
|
|
type="stl",
|
|
name=name,
|
|
arg_count=arg_count,
|
|
upvalue_count=0,
|
|
ip=0,
|
|
chunk=f"stl/{name}",
|
|
)
|
|
),
|
|
)
|
|
set_chunk_bytecode()
|
|
call_stack.append(frame)
|
|
continue # resume the loop without incrementing frame.ip
|
|
else:
|
|
raise HogVMException(f"Unsupported function call: {name}")
|
|
case Operation.CALL_LOCAL:
|
|
check_timeout()
|
|
closure = pop_stack()
|
|
if not isinstance(closure, dict) or closure.get("__hogClosure__") is None:
|
|
raise HogVMException(f"Invalid closure: {closure}")
|
|
callable = closure.get("callable")
|
|
if not isinstance(callable, dict) or callable.get("__hogCallable__") is None:
|
|
raise HogVMException(f"Invalid callable: {callable}")
|
|
args_length = next_token()
|
|
if args_length > MAX_FUNCTION_ARGS_LENGTH:
|
|
raise HogVMException("Too many arguments")
|
|
|
|
if callable.get("__hogCallable__") == "local":
|
|
if callable["argCount"] > args_length:
|
|
# TODO: specify minimum required arguments somehow
|
|
for _ in range(callable["argCount"] - args_length):
|
|
push_stack(None)
|
|
elif callable["argCount"] < args_length:
|
|
raise HogVMException(
|
|
f"Too many arguments. Passed {args_length}, expected {callable['argCount']}"
|
|
)
|
|
frame.ip += 1 # advance for when we return
|
|
frame = CallFrame(
|
|
ip=callable["ip"],
|
|
chunk=callable["chunk"],
|
|
stack_start=len(stack) - callable["argCount"],
|
|
arg_len=callable["argCount"],
|
|
closure=closure,
|
|
)
|
|
set_chunk_bytecode()
|
|
call_stack.append(frame)
|
|
continue # resume the loop without incrementing frame.ip
|
|
|
|
elif callable.get("__hogCallable__") == "stl":
|
|
if callable["name"] not in STL:
|
|
raise HogVMException(f"Unsupported function call: {callable['name']}")
|
|
stl_fn = STL[callable["name"]]
|
|
if stl_fn.minArgs is not None and args_length < stl_fn.minArgs:
|
|
raise HogVMException(
|
|
f"Function {callable['name']} requires at least {stl_fn.minArgs} arguments"
|
|
)
|
|
if stl_fn.maxArgs is not None and args_length > stl_fn.maxArgs:
|
|
raise HogVMException(f"Function {callable['name']} requires at most {stl_fn.maxArgs} arguments")
|
|
if version == 0:
|
|
args = [pop_stack() for _ in range(args_length)]
|
|
else:
|
|
args = list(reversed([pop_stack() for _ in range(args_length)]))
|
|
if stl_fn.maxArgs is not None and len(args) < stl_fn.maxArgs:
|
|
args = [*args, *([None] * (stl_fn.maxArgs - len(args)))]
|
|
push_stack(stl_fn.fn(args, team, stdout, timeout.total_seconds()))
|
|
|
|
elif callable.get("__hogCallable__") == "async":
|
|
raise HogVMException("Async functions are not supported")
|
|
|
|
else:
|
|
raise HogVMException("Invalid callable")
|
|
|
|
case Operation.TRY:
|
|
throw_stack.append(
|
|
ThrowFrame(
|
|
call_stack_len=len(call_stack), stack_len=len(stack), catch_ip=frame.ip + 1 + next_token()
|
|
)
|
|
)
|
|
case Operation.POP_TRY:
|
|
if throw_stack:
|
|
throw_stack.pop()
|
|
else:
|
|
raise HogVMException("Invalid operation POP_TRY: no try block to pop")
|
|
case Operation.THROW:
|
|
exception = pop_stack()
|
|
if not is_hog_error(exception):
|
|
raise HogVMException("Can not throw: value is not of type Error")
|
|
if throw_stack:
|
|
last_throw = throw_stack.pop()
|
|
call_stack_len, stack_len, catch_ip = (
|
|
last_throw.call_stack_len,
|
|
last_throw.stack_len,
|
|
last_throw.catch_ip,
|
|
)
|
|
stack_keep_first_elements(stack_len)
|
|
call_stack = call_stack[0:call_stack_len]
|
|
push_stack(exception)
|
|
frame = call_stack[-1]
|
|
set_chunk_bytecode()
|
|
frame.ip = catch_ip
|
|
continue
|
|
else:
|
|
raise UncaughtHogVMException(
|
|
type=exception.get("type"),
|
|
message=exception.get("message"),
|
|
payload=exception.get("payload"),
|
|
)
|
|
case _:
|
|
raise HogVMException(
|
|
f'Unexpected node while running bytecode in chunk "{frame.chunk}": {chunk_bytecode[frame.ip]}'
|
|
)
|
|
|
|
frame.ip += 1
|
|
|
|
return BytecodeResult(result=pop_stack() if len(stack) > 0 else None, stdout=stdout, bytecodes=bytecodes)
|