110 lines
4.1 KiB
C
110 lines
4.1 KiB
C
// Copyright 2018 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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#ifndef _PARITY_H_INCLUDED_
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#define _PARITY_H_INCLUDED_
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#include <stddef.h>
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/// Parameters to pass to `parity_start`.
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struct ParityParams {
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/// Configuration object, as handled by the `parity_config_*` functions.
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/// Note that calling `parity_start` will destroy the configuration object (even on failure).
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void *configuration;
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/// Callback function to call when the client receives an RPC request to change its chain spec.
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///
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/// Will only be called if you enable the `--can-restart` flag.
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///
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/// The first parameter of the callback is the value of `on_client_restart_cb_custom`.
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/// The second and third parameters of the callback are the string pointer and length.
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void (*on_client_restart_cb)(void* custom, const char* new_chain, size_t new_chain_len);
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/// Custom parameter passed to the `on_client_restart_cb` callback as first parameter.
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void *on_client_restart_cb_custom;
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};
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#ifdef __cplusplus
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extern "C" {
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#endif
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/// Builds a new configuration object by parsing a list of CLI arguments.
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///
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/// The first two parameters are string pointers and string lengths. They must have a length equal
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/// to `len`. The strings don't need to be zero-terminated.
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///
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/// On success, the produced object will be written to the `void*` pointed by `out`.
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///
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/// Returns 0 on success, and non-zero on error.
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///
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/// # Example
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///
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/// ```no_run
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/// void* cfg;
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/// const char *args[] = {"--light", "--can-restart"};
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/// size_t str_lens[] = {7, 13};
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/// if (parity_config_from_cli(args, str_lens, 2, &cfg) != 0) {
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/// return 1;
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/// }
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/// ```
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///
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int parity_config_from_cli(char const* const* args, size_t const* arg_lens, size_t len, void** out);
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/// Destroys a configuration object created earlier.
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///
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/// **Important**: You probably don't need to call this function. Calling `parity_start` destroys
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/// the configuration object as well (even on failure).
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void parity_config_destroy(void* cfg);
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/// Starts the parity client in background threads. Returns a pointer to a struct that represents
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/// the running client. Can also return NULL if the execution completes instantly.
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///
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/// **Important**: The configuration object passed inside `cfg` is destroyed when you
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/// call `parity_start` (even on failure).
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///
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/// On success, the produced object will be written to the `void*` pointed by `out`.
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///
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/// Returns 0 on success, and non-zero on error.
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int parity_start(const ParityParams* params, void** out);
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/// Destroys the parity client created with `parity_start`.
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///
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/// **Warning**: `parity_start` can return NULL if execution finished instantly, in which case you
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/// must not call this function.
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void parity_destroy(void* parity);
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/// Performs an RPC request.
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///
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/// Blocks the current thread until the request is finished. You are therefore encouraged to spawn
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/// a new thread for each RPC request that requires accessing the blockchain.
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///
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/// - `rpc` and `len` must contain the JSON string representing the RPC request.
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/// - `out_str` and `out_len` point to a buffer where the output JSON result will be stored. If the
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/// buffer is not large enough, the function fails.
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/// - `out_len` will receive the final length of the string.
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/// - On success, the function returns 0. On failure, it returns 1.
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///
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/// **Important**: Keep in mind that this function doesn't write any null terminator on the output
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/// string.
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///
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int parity_rpc(void* parity, const char* rpc, size_t len, char* out_str, size_t* out_len);
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#ifdef __cplusplus
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}
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#endif
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#endif // include guard
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