zenoh-flow 0.5.0-alpha.2

Zenoh-Flow: a Zenoh-based data flow programming framework for computations that span from the cloud to the device.
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//
// Copyright (c) 2021 - 2023 ZettaScale Technology
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License 2.0 which is available at
// http://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
//
// Contributors:
//   ZettaScale Zenoh Team, <zenoh@zettascale.tech>
//

use crate::prelude::PortId;
use crate::types::{Configuration, NodeId};
use crate::zferror;
use crate::zfresult::{ErrorKind, ZFResult as Result};
use serde::{Deserialize, Serialize};

/// Describes a source.
///
/// Example:
///
///
/// ```yaml
/// id : PrintSink
/// uri: file://./target/release/libcounter_source.so
/// configuration:
///   start: 10
/// outputs: [Counter]
/// ```
///
#[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq)]
pub struct SourceDescriptor {
    pub id: NodeId,
    pub outputs: Vec<PortId>,
    pub uri: Option<String>,
    pub configuration: Option<Configuration>,
}

impl std::fmt::Display for SourceDescriptor {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        write!(f, "{} - Kind: Source", self.id)
    }
}

impl SourceDescriptor {
    /// Creates a new `SourceDescriptor` from its YAML representation.
    ///
    ///  # Errors
    /// A variant error is returned if deserialization fails.
    pub fn from_yaml(data: &str) -> Result<Self> {
        let dataflow_descriptor = serde_yaml::from_str::<SourceDescriptor>(data)
            .map_err(|e| zferror!(ErrorKind::ParsingError, e))?;
        Ok(dataflow_descriptor)
    }

    /// Creates a new `SourceDescriptor` from its JSON representation.
    ///
    ///  # Errors
    /// A variant error is returned if deserialization fails.
    pub fn from_json(data: &str) -> Result<Self> {
        let dataflow_descriptor = serde_json::from_str::<SourceDescriptor>(data)
            .map_err(|e| zferror!(ErrorKind::ParsingError, e))?;
        Ok(dataflow_descriptor)
    }

    /// Returns the JSON representation of the `SourceDescriptor`.
    ///
    ///  # Errors
    /// A variant error is returned if serialization fails.
    pub fn to_json(&self) -> Result<String> {
        serde_json::to_string(&self).map_err(|e| zferror!(ErrorKind::SerializationError, e).into())
    }

    /// Returns the YAML representation of the `SourceDescriptor`.
    ///
    ///  # Errors
    /// A variant error is returned if serialization fails.
    pub fn to_yaml(&self) -> Result<String> {
        serde_yaml::to_string(&self).map_err(|e| zferror!(ErrorKind::SerializationError, e).into())
    }
}