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Add support for multi-database / multi-user pools (#96)
* Add support for multi-database / multi-user pools * Nothing * cargo fmt * CI * remove test users * rename pool * Update tests to use admin user/pass * more fixes * Revert bad change * Use PGDATABASE env var * send server info in case of admin
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Mostafa Abdelraouf
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126
pgcat.toml
126
pgcat.toml
@@ -5,21 +5,12 @@
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#
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# General pooler settings
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[general]
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# What IP to run on, 0.0.0.0 means accessible from everywhere.
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host = "0.0.0.0"
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# Port to run on, same as PgBouncer used in this example.
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port = 6432
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# How many connections to allocate per server.
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pool_size = 15
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# Pool mode (see PgBouncer docs for more).
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# session: one server connection per connected client
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# transaction: one server connection per client transaction
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pool_mode = "transaction"
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# How long to wait before aborting a server connection (ms).
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connect_timeout = 5000
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@@ -27,7 +18,7 @@ connect_timeout = 5000
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healthcheck_timeout = 1000
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# For how long to ban a server if it fails a health check (seconds).
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ban_time = 60 # Seconds
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ban_time = 60 # seconds
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# Reload config automatically if it changes.
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autoreload = false
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@@ -36,50 +27,20 @@ autoreload = false
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# tls_certificate = "server.cert"
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# tls_private_key = "server.key"
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#
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# User to use for authentication against the server.
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[user]
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name = "sharding_user"
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password = "sharding_user"
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# Credentials to access the virtual administrative database (pgbouncer or pgcat)
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# Connecting to that database allows running commands like `SHOW POOLS`, `SHOW DATABASES`, etc..
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admin_username = "user"
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admin_password = "pass"
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#
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# Shards in the cluster
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[shards]
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# Shard 0
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[shards.0]
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# [ host, port, role ]
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servers = [
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[ "127.0.0.1", 5432, "primary" ],
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[ "localhost", 5432, "replica" ],
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# [ "127.0.1.1", 5432, "replica" ],
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]
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# Database name (e.g. "postgres")
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database = "shard0"
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[shards.1]
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# [ host, port, role ]
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servers = [
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[ "127.0.0.1", 5432, "primary" ],
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[ "localhost", 5432, "replica" ],
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# [ "127.0.1.1", 5432, "replica" ],
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]
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database = "shard1"
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[shards.2]
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# [ host, port, role ]
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servers = [
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[ "127.0.0.1", 5432, "primary" ],
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[ "localhost", 5432, "replica" ],
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# [ "127.0.1.1", 5432, "replica" ],
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]
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database = "shard2"
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# Settings for our query routing layer.
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[query_router]
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# pool
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# configs are structured as pool.<pool_name>
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# the pool_name is what clients use as database name when connecting
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# For the example below a client can connect using "postgres://sharding_user:sharding_user@pgcat_host:pgcat_port/sharded"
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[pools.sharded]
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# Pool mode (see PgBouncer docs for more).
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# session: one server connection per connected client
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# transaction: one server connection per client transaction
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pool_mode = "transaction"
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# If the client doesn't specify, route traffic to
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# this role by default.
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@@ -89,7 +50,6 @@ database = "shard2"
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# primary: all queries go to the primary unless otherwise specified.
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default_role = "any"
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# Query parser. If enabled, we'll attempt to parse
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# every incoming query to determine if it's a read or a write.
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# If it's a read query, we'll direct it to a replica. Otherwise, if it's a write,
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@@ -110,3 +70,61 @@ primary_reads_enabled = true
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# sha1: A hashing function based on SHA1
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#
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sharding_function = "pg_bigint_hash"
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# Credentials for users that may connect to this cluster
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[pools.sharded.users.0]
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username = "sharding_user"
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password = "sharding_user"
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# Maximum number of server connections that can be established for this user
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# The maximum number of connection from a single Pgcat process to any database in the cluster
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# is the sum of pool_size across all users.
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pool_size = 9
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[pools.sharded.users.1]
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username = "other_user"
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password = "other_user"
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pool_size = 21
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# Shard 0
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[pools.sharded.shards.0]
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# [ host, port, role ]
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servers = [
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[ "127.0.0.1", 5432, "primary" ],
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[ "localhost", 5432, "replica" ]
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]
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# Database name (e.g. "postgres")
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database = "shard0"
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[pools.sharded.shards.1]
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servers = [
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[ "127.0.0.1", 5432, "primary" ],
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[ "localhost", 5432, "replica" ],
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]
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database = "shard1"
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[pools.sharded.shards.2]
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servers = [
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[ "127.0.0.1", 5432, "primary" ],
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[ "localhost", 5432, "replica" ],
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]
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database = "shard2"
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[pools.simple_db]
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pool_mode = "session"
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default_role = "primary"
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query_parser_enabled = true
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primary_reads_enabled = true
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sharding_function = "pg_bigint_hash"
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[pools.simple_db.users.0]
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username = "simple_user"
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password = "simple_user"
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pool_size = 5
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[pools.simple_db.shards.0]
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servers = [
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[ "127.0.0.1", 5432, "primary" ],
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[ "localhost", 5432, "replica" ]
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]
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database = "some_db"
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