middleware

Documentation for eth_defi.middleware Python module.

Web3 middleware.

Most for dealing with JSON-RPC unreliability issues with retries.

• Taken from exception_retry_request.py from Web3.py

• Modified to support sleep and throttling

• Logs warnings to Python logging subsystem in the case there is need to retry

• See also eth_defi.provider.broken_provider.

Module Attributes

DEFAULT_RETRYABLE_EXCEPTIONS	List of Web3 exceptions we know we should retry after some timeout
DEFAULT_RETRYABLE_HTTP_STATUS_CODES	List of HTTP status codes we know we might want to retry after a timeout
DEFAULT_RETRYABLE_RPC_ERROR_CODES	List of ValueError status codes we know we might want to retry after a timeout
DEFAULT_RETRYABLE_RPC_ERROR_MESSAGES	Because Ethreum JSON-RPC API is horribly broken, we also need to check for error messages besides error codes.
STATIC_CALL_LIST	Ethereum JSON-RPC calls where the value never changes

Functions

construct_sign_and_send_raw_middleware_anvil(...)	Capture transactions sign and send as raw transactions
exception_retry_middleware(make_request, ...)	Creates middleware that retries failed HTTP requests.
http_retry_request_with_sleep_middleware(...)	A HTTP retry middleware with sleep and backoff.
is_retryable_http_exception(exc[, ...])	Helper to check retryable errors from JSON-RPC calls.
raise_on_revert_middleware(make_request, web3)	Automatically show the transaction revert reason in Python traceback.
static_call_cache_middleware(make_request, web3)	Cache JSON-RPC call values that never chance.

Exceptions

ProbablyNodeHasNoBlock

A special exception raised when we suspect JSON-RPC node does not yet have data for a block we asked.