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// Copyright 2015 Matthew Holt and The Caddy Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package reverseproxy
import (
"net/http"
"net/http/httptest"
"testing"
)
func testPool() UpstreamPool {
return UpstreamPool{
{Host: new(upstreamHost)},
{Host: new(upstreamHost)},
{Host: new(upstreamHost)},
}
}
func TestRoundRobinPolicy(t *testing.T) {
pool := testPool()
rrPolicy := new(RoundRobinSelection)
req, _ := http.NewRequest("GET", "/", nil)
h := rrPolicy.Select(pool, req)
// First selected host is 1, because counter starts at 0
// and increments before host is selected
if h != pool[1] {
t.Error("Expected first round robin host to be second host in the pool.")
}
h = rrPolicy.Select(pool, req)
if h != pool[2] {
t.Error("Expected second round robin host to be third host in the pool.")
}
h = rrPolicy.Select(pool, req)
if h != pool[0] {
t.Error("Expected third round robin host to be first host in the pool.")
}
// mark host as down
pool[1].SetHealthy(false)
h = rrPolicy.Select(pool, req)
if h != pool[2] {
t.Error("Expected to skip down host.")
}
// mark host as up
pool[1].SetHealthy(true)
h = rrPolicy.Select(pool, req)
if h == pool[2] {
t.Error("Expected to balance evenly among healthy hosts")
}
// mark host as full
pool[1].CountRequest(1)
pool[1].MaxRequests = 1
h = rrPolicy.Select(pool, req)
if h != pool[2] {
t.Error("Expected to skip full host.")
}
}
func TestLeastConnPolicy(t *testing.T) {
pool := testPool()
lcPolicy := new(LeastConnSelection)
req, _ := http.NewRequest("GET", "/", nil)
pool[0].CountRequest(10)
pool[1].CountRequest(10)
h := lcPolicy.Select(pool, req)
if h != pool[2] {
t.Error("Expected least connection host to be third host.")
}
pool[2].CountRequest(100)
h = lcPolicy.Select(pool, req)
if h != pool[0] && h != pool[1] {
t.Error("Expected least connection host to be first or second host.")
}
}
func TestIPHashPolicy(t *testing.T) {
pool := testPool()
ipHash := new(IPHashSelection)
req, _ := http.NewRequest("GET", "/", nil)
// We should be able to predict where every request is routed.
req.RemoteAddr = "172.0.0.1:80"
h := ipHash.Select(pool, req)
if h != pool[1] {
t.Error("Expected ip hash policy host to be the second host.")
}
req.RemoteAddr = "172.0.0.2:80"
h = ipHash.Select(pool, req)
if h != pool[1] {
t.Error("Expected ip hash policy host to be the second host.")
}
req.RemoteAddr = "172.0.0.3:80"
h = ipHash.Select(pool, req)
if h != pool[2] {
t.Error("Expected ip hash policy host to be the third host.")
}
req.RemoteAddr = "172.0.0.4:80"
h = ipHash.Select(pool, req)
if h != pool[1] {
t.Error("Expected ip hash policy host to be the second host.")
}
// we should get the same results without a port
req.RemoteAddr = "172.0.0.1"
h = ipHash.Select(pool, req)
if h != pool[1] {
t.Error("Expected ip hash policy host to be the second host.")
}
req.RemoteAddr = "172.0.0.2"
h = ipHash.Select(pool, req)
if h != pool[1] {
t.Error("Expected ip hash policy host to be the second host.")
}
req.RemoteAddr = "172.0.0.3"
h = ipHash.Select(pool, req)
if h != pool[2] {
t.Error("Expected ip hash policy host to be the third host.")
}
req.RemoteAddr = "172.0.0.4"
h = ipHash.Select(pool, req)
if h != pool[1] {
t.Error("Expected ip hash policy host to be the second host.")
}
// we should get a healthy host if the original host is unhealthy and a
// healthy host is available
req.RemoteAddr = "172.0.0.1"
pool[1].SetHealthy(false)
h = ipHash.Select(pool, req)
if h != pool[2] {
t.Error("Expected ip hash policy host to be the third host.")
}
req.RemoteAddr = "172.0.0.2"
h = ipHash.Select(pool, req)
if h != pool[2] {
t.Error("Expected ip hash policy host to be the third host.")
}
pool[1].SetHealthy(true)
req.RemoteAddr = "172.0.0.3"
pool[2].SetHealthy(false)
h = ipHash.Select(pool, req)
if h != pool[0] {
t.Error("Expected ip hash policy host to be the first host.")
}
req.RemoteAddr = "172.0.0.4"
h = ipHash.Select(pool, req)
if h != pool[1] {
t.Error("Expected ip hash policy host to be the second host.")
}
// We should be able to resize the host pool and still be able to predict
// where a req will be routed with the same IP's used above
pool = UpstreamPool{
{Host: new(upstreamHost)},
{Host: new(upstreamHost)},
}
req.RemoteAddr = "172.0.0.1:80"
h = ipHash.Select(pool, req)
if h != pool[0] {
t.Error("Expected ip hash policy host to be the first host.")
}
req.RemoteAddr = "172.0.0.2:80"
h = ipHash.Select(pool, req)
if h != pool[1] {
t.Error("Expected ip hash policy host to be the second host.")
}
req.RemoteAddr = "172.0.0.3:80"
h = ipHash.Select(pool, req)
if h != pool[0] {
t.Error("Expected ip hash policy host to be the first host.")
}
req.RemoteAddr = "172.0.0.4:80"
h = ipHash.Select(pool, req)
if h != pool[1] {
t.Error("Expected ip hash policy host to be the second host.")
}
// We should get nil when there are no healthy hosts
pool[0].SetHealthy(false)
pool[1].SetHealthy(false)
h = ipHash.Select(pool, req)
if h != nil {
t.Error("Expected ip hash policy host to be nil.")
}
}
func TestFirstPolicy(t *testing.T) {
pool := testPool()
firstPolicy := new(FirstSelection)
req := httptest.NewRequest(http.MethodGet, "/", nil)
h := firstPolicy.Select(pool, req)
if h != pool[0] {
t.Error("Expected first policy host to be the first host.")
}
pool[0].SetHealthy(false)
h = firstPolicy.Select(pool, req)
if h != pool[1] {
t.Error("Expected first policy host to be the second host.")
}
}
func TestURIHashPolicy(t *testing.T) {
pool := testPool()
uriPolicy := new(URIHashSelection)
request := httptest.NewRequest(http.MethodGet, "/test", nil)
h := uriPolicy.Select(pool, request)
if h != pool[0] {
t.Error("Expected uri policy host to be the first host.")
}
pool[0].SetHealthy(false)
h = uriPolicy.Select(pool, request)
if h != pool[1] {
t.Error("Expected uri policy host to be the first host.")
}
request = httptest.NewRequest(http.MethodGet, "/test_2", nil)
h = uriPolicy.Select(pool, request)
if h != pool[1] {
t.Error("Expected uri policy host to be the second host.")
}
// We should be able to resize the host pool and still be able to predict
// where a request will be routed with the same URI's used above
pool = UpstreamPool{
{Host: new(upstreamHost)},
{Host: new(upstreamHost)},
}
request = httptest.NewRequest(http.MethodGet, "/test", nil)
h = uriPolicy.Select(pool, request)
if h != pool[0] {
t.Error("Expected uri policy host to be the first host.")
}
pool[0].SetHealthy(false)
h = uriPolicy.Select(pool, request)
if h != pool[1] {
t.Error("Expected uri policy host to be the first host.")
}
request = httptest.NewRequest(http.MethodGet, "/test_2", nil)
h = uriPolicy.Select(pool, request)
if h != pool[1] {
t.Error("Expected uri policy host to be the second host.")
}
pool[0].SetHealthy(false)
pool[1].SetHealthy(false)
h = uriPolicy.Select(pool, request)
if h != nil {
t.Error("Expected uri policy policy host to be nil.")
}
}
func TestLeastRequests(t *testing.T) {
pool := testPool()
pool[0].Dial = "localhost:8080"
pool[1].Dial = "localhost:8081"
pool[2].Dial = "localhost:8082"
pool[0].SetHealthy(true)
pool[1].SetHealthy(true)
pool[2].SetHealthy(true)
pool[0].CountRequest(10)
pool[1].CountRequest(20)
pool[2].CountRequest(30)
result := leastRequests(pool)
if result == nil {
t.Error("Least request should not return nil")
}
if result != pool[0] {
t.Error("Least request should return pool[0]")
}
}
func TestRandomChoicePolicy(t *testing.T) {
pool := testPool()
pool[0].Dial = "localhost:8080"
pool[1].Dial = "localhost:8081"
pool[2].Dial = "localhost:8082"
pool[0].SetHealthy(false)
pool[1].SetHealthy(true)
pool[2].SetHealthy(true)
pool[0].CountRequest(10)
pool[1].CountRequest(20)
pool[2].CountRequest(30)
request := httptest.NewRequest(http.MethodGet, "/test", nil)
randomChoicePolicy := new(RandomChoiceSelection)
randomChoicePolicy.Choose = 2
h := randomChoicePolicy.Select(pool, request)
if h == nil {
t.Error("RandomChoicePolicy should not return nil")
}
if h == pool[0] {
t.Error("RandomChoicePolicy should not choose pool[0]")
}
}
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