Extended query protocol sharding (#339)

* Prepared stmt sharding

s

tests

* len check

* remove python test

* latest rust

* move that to debug for sure

* Add the actual tests

* latest image

* Update tests/ruby/sharding_spec.rb

tests/ruby/helpers/pgcat_helper.rb

@@ -24,8 +24,9 @@ module Helpers
           "default_role" => "any",
           "pool_mode" => pool_mode,
           "load_balancing_mode" => lb_mode,
-          "primary_reads_enabled" => false,
-          "query_parser_enabled" => false,
+          "primary_reads_enabled" => true,
+          "query_parser_enabled" => true,
+          "automatic_sharding_key" => "data.id",
           "sharding_function" => "pg_bigint_hash",
           "shards" => {
             "0" => { "database" => "shard0", "servers" => [["localhost", primary0.port.to_s, "primary"]] },

tests/ruby/sharding_spec.rb

@@ -0,0 +1,51 @@
+# frozen_string_literal: true
+require_relative 'spec_helper'
+
+
+describe "Sharding" do
+  let(:processes) { Helpers::Pgcat.three_shard_setup("sharded_db", 5) }
+
+  before do
+    conn = PG.connect(processes.pgcat.connection_string("sharded_db", "sharding_user"))
+
+    # Setup the sharding data
+    3.times do |i|
+      conn.exec("SET SHARD TO '#{i}'")
+      conn.exec("DELETE FROM data WHERE id > 0")
+    end
+
+    18.times do |i|
+      i = i + 1
+      conn.exec("SET SHARDING KEY TO '#{i}'")
+      conn.exec("INSERT INTO data (id, value) VALUES (#{i}, 'value_#{i}')")
+    end
+  end
+
+  after do
+
+    processes.all_databases.map(&:reset)
+    processes.pgcat.shutdown
+  end
+
+  describe "automatic routing of extended procotol" do
+    it "can do it" do
+      conn = PG.connect(processes.pgcat.connection_string("sharded_db", "sharding_user"))
+      conn.exec("SET SERVER ROLE TO 'auto'")
+
+      18.times do |i|
+        result = conn.exec_params("SELECT * FROM data WHERE id = $1", [i + 1])
+        expect(result.ntuples).to eq(1)
+      end
+    end
+
+    it "can do it with multiple parameters" do
+      conn = PG.connect(processes.pgcat.connection_string("sharded_db", "sharding_user"))
+      conn.exec("SET SERVER ROLE TO 'auto'")
+
+      18.times do |i|
+        result = conn.exec_params("SELECT * FROM data WHERE id = $1 AND id = $2", [i + 1, i + 1])
+        expect(result.ntuples).to eq(1)
+      end
+    end
+  end
+end