47 lines
1.6 KiB
Rust
47 lines
1.6 KiB
Rust
// Copyright 2015, 2016 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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//! Parameters parsing helpers
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use serde;
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use jsonrpc_core::{Error, Params, from_params};
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use v1::types::BlockNumber;
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use v1::helpers::errors;
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pub fn expect_no_params(params: Params) -> Result<(), Error> {
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match params {
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Params::None => Ok(()),
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p => Err(errors::invalid_params("No parameters were expected", p)),
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}
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}
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/// Returns number of different parameters in given `Params` object.
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pub fn params_len(params: &Params) -> usize {
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match params {
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&Params::Array(ref vec) => vec.len(),
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_ => 0,
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}
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}
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/// Deserialize request parameters with optional third parameter `BlockNumber` defaulting to `BlockNumber::Latest`.
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pub fn from_params_default_third<F1, F2>(params: Params) -> Result<(F1, F2, BlockNumber, ), Error> where F1: serde::de::Deserialize, F2: serde::de::Deserialize {
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match params_len(¶ms) {
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2 => from_params::<(F1, F2, )>(params).map(|(f1, f2)| (f1, f2, BlockNumber::Latest)),
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_ => from_params::<(F1, F2, BlockNumber)>(params)
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}
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}
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