Age limit featured for proxies added.

README.md

@@ -47,6 +47,17 @@ All you need is:
 
 ### Installation
 
+#### Environment variables:
+
+##### Required
+`` USERNAME`` - set the username for the forward proxy.
+
+`` PASSWORD`` - set the password for the forward proxy.
+
+##### Optional
+
+`` AGE_LIMIT`` - set the age limit for your forward proxies in seconds. Once the age limit is reached, the proxy is replaced. A value of 0 disables the feature. Default value: 0.
+
 See individual provider pages for environment variables required in above providers supported section.
 
 #### Docker (recommended)

cloudproxy/providers/aws/main.py

@@ -42,15 +42,21 @@ def aws_check_alive():
     ip_ready = []
     for instance in list_instances():
         try:
-            if check_alive(instance["Instances"][0]["PublicIpAddress"]):
+            elapsed = datetime.datetime.now(
+                datetime.timezone.utc
+            ) - dateparser.parse(instance["Instances"][0]["LaunchTime"])
+            if config["age_limit"] > 0:
+                if elapsed > datetime.timedelta(seconds=config["age_limit"]):
+                    delete_proxy(instance["Instances"][0]["InstanceId"])
+                    logger.info(
+                        "Recycling droplet, reached age limit -> " + instance["Instances"][0]["PublicIpAddress"]
+                    )
+            elif check_alive(instance["Instances"][0]["PublicIpAddress"]):
                 logger.info(
                     "Alive: AWS -> " + instance["Instances"][0]["PublicIpAddress"]
                 )
                 ip_ready.append(instance["Instances"][0]["PublicIpAddress"])
             else:
-                elapsed = datetime.datetime.now(
-                    datetime.timezone.utc
-                ) - dateparser.parse(instance["Instances"][0]["LaunchTime"])
                 if elapsed > datetime.timedelta(minutes=10):
                     delete_proxy(instance["Instances"][0]["InstanceId"])
                     logger.info(

cloudproxy/providers/digitalocean/main.py

@@ -11,7 +11,7 @@
     delete_proxy,
 )
 from cloudproxy.providers import settings
-from cloudproxy.providers.settings import delete_queue
+from cloudproxy.providers.settings import delete_queue, config
 
 
 def do_deployment(min_scaling):
@@ -38,13 +38,19 @@ def do_check_alive():
     ip_ready = []
     for droplet in list_droplets():
         try:
-            if check_alive(droplet.ip_address):
+            elapsed = datetime.datetime.now(
+                datetime.timezone.utc
+            ) - dateparser.parse(droplet.created_at)
+            if config["age_limit"] > 0:
+                if elapsed > datetime.timedelta(seconds=config["age_limit"]):
+                    delete_proxy(droplet)
+                    logger.info(
+                        "Recycling droplet, reached age limit -> " + str(droplet.ip_address)
+                    )
+            elif check_alive(droplet.ip_address):
                 logger.info("Alive: DO -> " + str(droplet.ip_address))
                 ip_ready.append(droplet.ip_address)
             else:
-                elapsed = datetime.datetime.now(
-                    datetime.timezone.utc
-                ) - dateparser.parse(droplet.created_at)
                 if elapsed > datetime.timedelta(minutes=10):
                     delete_proxy(droplet)
                     logger.info(

cloudproxy/providers/settings.py

@@ -3,6 +3,7 @@
 
 config = {
     "auth": {"username": "", "password": ""},
+    "age_limit": 0,
     "providers": {
         "digitalocean": {
             "enabled": False,
@@ -30,6 +31,7 @@
 # Set proxy authentication
 config["auth"]["username"] = os.environ.get("USERNAME", "changeme")
 config["auth"]["password"] = os.environ.get("PASSWORD", "changeme")
+config["age_limit"] = int(os.environ.get('AGE_LIMIT', 0))
 
 # Set DigitalOceana config
 config["providers"]["digitalocean"]["enabled"] = os.environ.get(