shard-crystal-db/spec/http_client_pool_spec.cr

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require "./spec_helper"
require "./support/http"
describe DB::Pool do
it "distributes evenly the requests" do
mutex = Mutex.new
requests_per_connection = Hash(Socket::Address, Int32).new
server = HTTP::Server.new do |context|
remote_address = context.request.remote_address.not_nil!
mutex.synchronize do
requests_per_connection[remote_address] ||= 0
requests_per_connection[remote_address] += 1
end
sleep context.request.query_params["delay"].to_f
context.response.print "ok"
end
address = server.bind_unused_port "127.0.0.1"
run_server(server) do
fixed_pool_size = 5
expected_per_connection = 5
requests = fixed_pool_size * expected_per_connection
pool = DB::Pool.new(
initial_pool_size: fixed_pool_size,
max_pool_size: fixed_pool_size,
max_idle_pool_size: fixed_pool_size) {
HTTP::Client.new(URI.parse("http://127.0.0.1:#{address.port}/"))
}
done = Channel(Nil).new
requests.times do
spawn do
pool.checkout do |http|
http.get("/?delay=0.1")
end
done.send(nil)
end
end
spawn do
requests.times { done.receive }
done.close
end
wait_for { done.closed? }
requests_per_connection.values.should eq([expected_per_connection] * fixed_pool_size)
end
end
end