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chainHead: Backport error codes from spec (paritytech#2539)
This PR backports the error codes from the spec. This relies on two specs for defining the error codes: - Our rpc-spec-v2 https://github.com/paritytech/json-rpc-interface-spec. - JSON-RPC spec https://www.jsonrpc.org/specification#error_object. To better describe the error codes, they are divided into two separate modules `rpc_spec_v2` and `json_rpc_spec` respectively. The `InvalidSubscriptionID` and `FetchBlockHeader` are merged into the JSON-RPC spec `INTERNAL_ERROR`. While the other error codes are adjusted from spec. Errors that are currently in use: - -32801 block hash not reported by chainHead_follow or block hash has been unpinned - -32802 chainHead_follow started with withRuntime == false - -32803 chainHead_follow did not generate an operationWaitingForContinue event The following are errors defined in the [JSON-RPC spec](https://www.jsonrpc.org/specification#error_object): - -32602 The provided parameter isn't one of the expected values, has different format or is missing - -32603 Internal server error Note: Error `-32801` must be introduced and generated by the outstanding paritytech#1505 Closes: paritytech#2530 --------- Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
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