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use std::{fmt, str::FromStr};
use self::external_schema::ExternalSchema;
use crate::common::*;
pub(crate) mod external_schema;
#[derive(Clone, Debug)]
pub struct DbcrossbarSchemaLocator {
path: PathOrStdio,
}
impl fmt::Display for DbcrossbarSchemaLocator {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.path.fmt_locator_helper(Self::scheme(), f)
}
}
impl FromStr for DbcrossbarSchemaLocator {
type Err = Error;
fn from_str(s: &str) -> Result<Self> {
let path = PathOrStdio::from_str_locator_helper(Self::scheme(), s)?;
Ok(DbcrossbarSchemaLocator { path })
}
}
impl Locator for DbcrossbarSchemaLocator {
fn as_any(&self) -> &dyn Any {
self
}
fn schema(&self, _ctx: Context) -> BoxFuture<Option<Schema>> {
schema_helper(self.to_owned()).boxed()
}
fn write_schema(
&self,
_ctx: Context,
schema: Schema,
if_exists: IfExists,
) -> BoxFuture<()> {
write_schema_helper(self.to_owned(), schema, if_exists).boxed()
}
}
impl LocatorStatic for DbcrossbarSchemaLocator {
fn scheme() -> &'static str {
"dbcrossbar-schema:"
}
fn features() -> Features {
Features {
locator: LocatorFeatures::Schema | LocatorFeatures::WriteSchema,
write_schema_if_exists: IfExistsFeatures::no_append(),
source_args: EnumSet::empty(),
dest_args: EnumSet::empty(),
dest_if_exists: EnumSet::empty(),
_placeholder: (),
}
}
}
#[instrument(level = "trace", name = "dbcrossbar_schema::schema")]
async fn schema_helper(source: DbcrossbarSchemaLocator) -> Result<Option<Schema>> {
let input = source.path.open_async().await?;
let data = async_read_to_end(input)
.await
.with_context(|| format!("error reading {}", source.path))?;
let external_schema: ExternalSchema = serde_json::from_slice(&data)
.with_context(|| format!("error parsing {}", source.path))?;
Ok(Some(external_schema.into_schema()?))
}
#[instrument(
level = "trace",
name = "dbcrossbar_schema::write_schema",
skip(schema, if_exists)
)]
async fn write_schema_helper(
dest: DbcrossbarSchemaLocator,
schema: Schema,
if_exists: IfExists,
) -> Result<()> {
let mut f = dest.path.create_async(if_exists).await?;
buffer_sync_write_and_copy_to_async(&mut f, |buff| {
serde_json::to_writer_pretty(buff, &schema)
})
.await
.with_context(|| format!("error writing to {}", dest.path))?;
f.flush().await?;
Ok(())
}