Define more possible error cases for the API

vultron/api.py

@@ -1,4 +1,21 @@
 import requests
+import vultron.err
+
+class BadCreds(vultron.err.Error):
+  def __str__(self):
+    return f"api key supplied is not valid"
+
+class BadReq(vultron.err.Error):
+  def __str__(self):
+    return f"received unexpected error code: {self.args[0]}"
+
+class RateLimit(vultron.err.Error):
+  def __str__(self):
+    return f"you are currently being rate limited by Vultr"
+
+class VultrIssue(vultron.err.Error):
+  def __str__(self):
+    return f"request could not be processed by Vultr"
 
 class Client:
   DEFAULT_ENDPOINT = "https://api.vultr.com/v2"
@@ -10,6 +27,7 @@ class Client:
       self.endpoint = self.DEFAULT_ENDPOINT
 
     self.hdrs = {
+      # FIXME: Find way to automatically get version
       "User-Agent": "Vultron",
       "Authorization": f"Bearer {api_key}"
     }
@@ -18,8 +36,15 @@ class Client:
     url = f"{self.endpoint}/{'/'.join(resources)}"
     res = requests.get(url, headers=self.hdrs)
 
-    if res.status_code == 200:
+    if res.status_code in (200, 202):
       return res.json()
+    elif res.status_code == 204:
+      return None
+    elif res.status_code == 401:
+      raise BadCreds()
+    elif res.status_code == 429:
+      raise RateLimit()
+    elif res.status_code == 500:
+      raise VultrIssue()
     else:
-      pass
-      # FIXME: raise error w/ status code here
+      raise BadReq(res.status_code)