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|
use base64::{Engine, engine::general_purpose};
use tracing::debug;
use warden_core::pagination::{Connection, Edge, PageInfo, PaginationArgs};
use crate::{
ConfigurationError,
schema::{SchemaService, TransactionSchema, pagination::DecodedSchemaPagination},
};
fn decode_cursors(
args: &PaginationArgs,
limit: i64,
) -> Result<DecodedSchemaPagination, ConfigurationError> {
let limit = args
.first
.or(args.last)
.map(|value| if value > limit { limit } else { value })
.unwrap_or(limit);
// Fetch limit + 1 to check if there's a next/prev page
let query_limit = limit + 1;
let (id, type_cursor, ver_cursor) =
if let Some(cursor) = args.after.as_ref().or(args.before.as_ref()) {
let decoded = general_purpose::STANDARD.decode(cursor)?;
let s = String::from_utf8(decoded)?;
let parts: Vec<&str> = s.split(',').collect();
(
Some(parts[0].parse()?),
Some(parts[1].to_string()),
Some(parts[2].to_string()),
)
} else {
(None, None, None)
};
Ok(DecodedSchemaPagination {
type_cursor,
version_cursor: ver_cursor,
limit: query_limit,
is_last: args.last.is_some(),
base_limit: limit,
id,
})
}
pub(super) async fn list_schemas(
state: &SchemaService,
args: &PaginationArgs,
limit: i64,
) -> Result<Connection<TransactionSchema>, ConfigurationError> {
debug!("listing schemas transaction schema");
let input = decode_cursors(args, limit)?;
let rows = if input.is_last {
// BACKWARD PAGINATION
sqlx::query_as!(
TransactionSchema,
"
select * from (
select * from transaction_schema
where ($1::bigint is null or (id, schema_type, schema_version) < ($1, $2, $3))
order by id desc, schema_type desc, schema_version desc
limit $4
) sub
order by id asc, schema_type asc, schema_version asc
",
input.id,
input.type_cursor,
input.version_cursor,
input.limit
)
.fetch_all(&state.database)
.await?
} else {
// FORWARD PAGINATION (Default)
sqlx::query_as!(
TransactionSchema,
"
select * from transaction_schema
where ($1::bigint is null or (id, schema_type, schema_version) > ($1, $2, $3))
order by id asc, schema_type asc, schema_version asc
limit $4
",
input.id,
input.type_cursor,
input.version_cursor,
input.limit
)
.fetch_all(&state.database)
.await?
};
let res = encode_cursors(&rows, &input)?;
Ok(res)
}
fn encode_cursors(
rows: &[TransactionSchema],
args: &DecodedSchemaPagination,
) -> Result<Connection<TransactionSchema>, ConfigurationError> {
let has_extra = rows.len() > args.base_limit as usize;
let final_rows = if has_extra {
if args.is_last {
&rows[1..]
} else {
&rows[..args.base_limit as usize]
}
} else {
rows
};
let edges = final_rows
.iter()
.map(|row| {
let raw_cursor = format!("{},{},{}", row.id, row.schema_type, row.schema_version);
Edge {
node: row.clone(),
cursor: general_purpose::STANDARD.encode(raw_cursor),
}
})
.collect::<Vec<_>>();
let page_info = PageInfo {
has_next_page: if args.is_last { false } else { has_extra },
has_previous_page: if args.is_last { has_extra } else { false },
start_cursor: edges.first().map(|e| e.cursor.clone()),
end_cursor: edges.last().map(|e| e.cursor.clone()),
};
Ok(Connection { edges, page_info })
}
#[cfg(test)]
mod tests {
use base64::{Engine, engine::general_purpose};
use sqlx::PgPool;
use warden_core::pagination::PaginationArgs;
use crate::schema::{SchemaDriver, SchemaService};
#[sqlx::test(
migrator = "crate::MIGRATOR",
fixtures(path = "../../tests/fixtures", scripts("schema"))
)]
async fn test_forward_pagination(pool: PgPool) -> anyhow::Result<()> {
let get_count = 2;
// 1. Request first 2
let args = PaginationArgs {
first: Some(get_count),
after: None,
last: None,
before: None,
};
let limit = 10;
let driver = SchemaService { database: pool };
let res = driver.list_schemas(&args, limit).await?;
assert_eq!(res.edges.len(), get_count as usize);
dbg!(&res);
assert_eq!(res.edges[0].node.schema_type, "payment");
assert_eq!(res.edges[0].node.schema_version, "1.0.0");
assert!(res.page_info.has_next_page);
// 2. Request next 2 using the end_cursor
let args_next = PaginationArgs {
first: Some(2),
after: res.page_info.end_cursor,
last: None,
before: None,
};
let res_next = driver.list_schemas(&args_next, limit).await?;
assert_eq!(res_next.edges.len(), 2);
assert_eq!(res_next.edges[0].node.schema_type, "payment");
assert_eq!(res_next.edges[1].node.schema_type, "refund");
Ok(())
}
#[sqlx::test(
migrator = "crate::MIGRATOR",
fixtures(path = "../../tests/fixtures", scripts("schema"))
)]
async fn test_backward_pagination(pool: PgPool) -> anyhow::Result<()> {
let get_count = 2;
let cursor = general_purpose::STANDARD.encode("4,refund,1.2.0");
let args = PaginationArgs {
first: None,
after: None,
last: Some(get_count),
before: Some(cursor),
};
let limit = 10;
let driver = SchemaService { database: pool };
let res = driver.list_schemas(&args, limit).await?;
assert_eq!(res.edges.len(), get_count as usize);
assert_eq!(res.edges[0].node.schema_type, "refund");
assert_eq!(res.edges[0].node.schema_version, "1.0.0");
assert_eq!(res.edges[1].node.schema_type, "payment");
assert_eq!(res.edges[1].node.schema_version, "1.1.0");
Ok(())
}
}
|
