systemprompt-agent 0.63.0

//! The single row → [`Part`] converter shared by every message-part and
//! artifact-part read path, so a malformed row is rejected identically
//! whether a task is fetched singly, in a batch, or by context.
//!
//! Copyright (c) systemprompt.io — Business Source License 1.1.
//! See <https://systemprompt.io> for licensing details.

use crate::models::a2a::{DataPart, FileContent, FilePart, Part, TextPart};
use crate::models::{ArtifactPartRow, MessagePart};
use systemprompt_traits::RepositoryError;

pub(crate) const PART_KIND_TEXT: &str = "text";
pub(crate) const PART_KIND_FILE: &str = "file";
pub(crate) const PART_KIND_DATA: &str = "data";

pub(crate) trait PartColumns {
    fn part_kind(&self) -> &str;
    fn text_content(&self) -> Option<&str>;
    fn file_name(&self) -> Option<&str>;
    fn file_mime_type(&self) -> Option<&str>;
    fn file_uri(&self) -> Option<&str>;
    fn file_bytes(&self) -> Option<&str>;
    // JSON: JSONB `data_content` column — an A2A DataPart holds any JSON object.
    fn data_content(&self) -> Option<&serde_json::Value>;
}

macro_rules! impl_part_columns {
    ($row:ty) => {
        impl PartColumns for $row {
            fn part_kind(&self) -> &str {
                &self.part_kind
            }
            fn text_content(&self) -> Option<&str> {
                self.text_content.as_deref()
            }
            fn file_name(&self) -> Option<&str> {
                self.file_name.as_deref()
            }
            fn file_mime_type(&self) -> Option<&str> {
                self.file_mime_type.as_deref()
            }
            fn file_uri(&self) -> Option<&str> {
                self.file_uri.as_deref()
            }
            fn file_bytes(&self) -> Option<&str> {
                self.file_bytes.as_deref()
            }
            // JSON: JSONB `data_content` column — an A2A DataPart holds any JSON object.
            fn data_content(&self) -> Option<&serde_json::Value> {
                self.data_content.as_ref()
            }
        }
    };
}

impl_part_columns!(MessagePart);
impl_part_columns!(ArtifactPartRow);

pub(crate) fn part_from_row(row: &impl PartColumns) -> Result<Part, RepositoryError> {
    match row.part_kind() {
        PART_KIND_TEXT => {
            let text = row.text_content().ok_or_else(|| {
                RepositoryError::invalid_data("text_content", "missing for a text part")
            })?;
            Ok(Part::Text(TextPart {
                text: text.to_owned(),
            }))
        },
        PART_KIND_FILE => {
            if row.file_uri().is_none() && row.file_bytes().is_none() {
                return Err(RepositoryError::invalid_data(
                    "file_uri",
                    "file part has neither file_uri nor file_bytes",
                ));
            }
            Ok(Part::File(FilePart {
                file: FileContent {
                    name: row.file_name().map(str::to_owned),
                    mime_type: row.file_mime_type().map(str::to_owned),
                    bytes: row.file_bytes().map(str::to_owned),
                    url: row.file_uri().map(str::to_owned),
                },
            }))
        },
        PART_KIND_DATA => {
            let data_value = row.data_content().ok_or_else(|| {
                RepositoryError::invalid_data("data_content", "missing for a data part")
            })?;
            let serde_json::Value::Object(data) = data_value else {
                return Err(RepositoryError::invalid_data(
                    "data_content",
                    "must be a JSON object",
                ));
            };
            Ok(Part::Data(DataPart { data: data.clone() }))
        },
        other => Err(RepositoryError::invalid_data(
            "part_kind",
            format!("unknown part kind {other}"),
        )),
    }
}

pub(crate) fn parts_from_rows<R: PartColumns>(rows: &[R]) -> Result<Vec<Part>, RepositoryError> {
    rows.iter().map(part_from_row).collect()
}