docker/pgcat
1
0
Fork 0
mirror of https://github.com/postgresml/pgcat.git synced 2026-03-26 10:26:30 +00:00
Code Issues Packages Projects Releases Wiki Activity

Another example of a sharding function (#41)

Browse Source 
* Another example of a sharding function

* tests
This commit is contained in:
Lev Kokotov
2022-02-23 11:47:24 -08:00
committed by Lev Kokotov
parent dce72ba262
commit b3c8ca4b8a
4 changed files with 99 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
src/query_router.rs
View File

@@ -1,5 +1,5 @@
use crate::config::{get_config, Role};
use crate::sharding::Sharder;
use crate::sharding::{Sharder, ShardingFunction};
/// Route queries automatically based on explicitely requested
/// or implied query characteristics.
use bytes::{Buf, BytesMut};
@@ -48,6 +48,9 @@ pub struct QueryRouter {
// Should we try to parse queries?
query_parser_enabled: bool,
// Which sharding function are we using?
sharding_function: ShardingFunction,
}
impl QueryRouter {
@@ -76,6 +79,12 @@ impl QueryRouter {
_ => unreachable!(),
};
let sharding_function = match config.query_router.sharding_function.as_ref() {
"pg_bigint_hash" => ShardingFunction::PgBigintHash,
"sha1" => ShardingFunction::Sha1,
_ => unreachable!(),
};
QueryRouter {
default_server_role: default_server_role,
shards: config.shards.len(),
@@ -84,6 +93,7 @@ impl QueryRouter {
active_shard: None,
primary_reads_enabled: config.query_router.primary_reads_enabled,
query_parser_enabled: config.query_router.query_parser_enabled,
sharding_function,
}
}
@@ -139,8 +149,8 @@ impl QueryRouter {
match command {
Command::SetShardingKey => {
let sharder = Sharder::new(self.shards);
let shard = sharder.pg_bigint_hash(value.parse::<i64>().unwrap());
let sharder = Sharder::new(self.shards, self.sharding_function);
let shard = sharder.shard(value.parse::<i64>().unwrap());
self.active_shard = Some(shard);
value = shard.to_string();
}