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use lazy_static::lazy_static;
use regex::Regex;
use std::{
fmt,
str::{self, FromStr},
};
use crate::common::*;
use crate::drivers::postgres_shared::{PgName, PgSchema};
#[derive(Clone, Debug)]
pub struct PostgresSqlLocator {
path: PathOrStdio,
}
impl fmt::Display for PostgresSqlLocator {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.path.fmt_locator_helper(Self::scheme(), f)
}
}
impl FromStr for PostgresSqlLocator {
type Err = Error;
fn from_str(s: &str) -> Result<Self> {
let path = PathOrStdio::from_str_locator_helper(Self::scheme(), s)?;
Ok(PostgresSqlLocator { path })
}
}
impl Locator for PostgresSqlLocator {
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 PostgresSqlLocator {
fn scheme() -> &'static str {
"postgres-sql:"
}
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 = "postgres_sql::schema")]
async fn schema_helper(source: PostgresSqlLocator) -> Result<Option<Schema>> {
let input = source
.path
.open_async()
.await
.with_context(|| format!("error opening {}", source.path))?;
let sql = async_read_to_string(input)
.await
.with_context(|| format!("error reading {}", source.path))?;
let pg_schema = PgSchema::parse(source.path.to_string(), sql)?;
let schema = pg_schema.to_schema()?;
Ok(Some(schema))
}
#[instrument(level = "trace", name = "postgres_sql::write_schema")]
async fn write_schema_helper(
dest: PostgresSqlLocator,
schema: Schema,
if_exists: IfExists,
) -> Result<()> {
let table_name = sanitize_table_name(&schema.table.name)?.parse::<PgName>()?;
let pg_schema = PgSchema::from_schema_and_name(&schema, &table_name)?;
let mut out = dest.path.create_async(if_exists).await?;
buffer_sync_write_and_copy_to_async(&mut out, |buff| {
write!(buff, "{}", pg_schema)
})
.await
.with_context(|| format!("error writing {}", dest.path))?;
out.flush().await?;
Ok(())
}
fn sanitize_table_name(table_name: &str) -> Result<String> {
lazy_static! {
static ref RE: Regex = Regex::new(
r"(?x)
([_a-zA-Z][_a-zA-Z0-9]*\.)?
([_a-zA-Z][_a-zA-Z0-9]*)
$"
)
.expect("could not compile regex in source");
}
if let Some(cap) = RE.captures(table_name) {
Ok(cap[0].to_owned())
} else {
Ok("data".to_owned())
}
}