capacity limiter and general cleanup

capsulflask/console.py

@@ -75,7 +75,7 @@ def detail(id):
 
   vm["ipv4"] = double_check_capsul_address(vm["id"], vm["ipv4"])
   vm["created"] = vm['created'].strftime("%b %d %Y %H:%M")
-  vm["ssh_public_keys"] = ", ".join(vm["ssh_public_keys"]) if len(vm["ssh_public_keys"]) > 0 else "<deleted>"
+  vm["ssh_public_keys"] = ", ".join(vm["ssh_public_keys"]) if len(vm["ssh_public_keys"]) > 0 else "<missing>"
 
   return render_template(
     "capsul-detail.html", 
@@ -92,6 +92,7 @@ def create():
   operating_systems = get_model().operating_systems_dict()
   ssh_public_keys = get_model().list_ssh_public_keys_for_account(session["account"])
   account_balance = get_account_balance()
+  capacity_avaliable = current_app.config["VIRTUALIZATION_MODEL"].capacity_avaliable(512*1024*1024)
   errors = list()
   created_os = None
 
@@ -130,6 +131,13 @@ def create():
     if len(posted_keys) == 0:
       errors.append("At least one SSH Public Key is required")
 
+    capacity_avaliable = current_app.config["VIRTUALIZATION_MODEL"].capacity_avaliable(vm_sizes[size]['memory_mb']*1024*1024)
+
+    if not capacity_avaliable:
+      errors.append("""
+        host(s) at capacity. no capsuls can be created at this time. sorry. 
+      """)
+
     if len(errors) == 0:
       id = makeCapsulId()
       get_model().create_vm(
@@ -157,9 +165,13 @@ def create():
   for error in errors:
     flash(error)
 
+  if not capacity_avaliable:
+    print(f"when capsul capacity is restored, send an email to {session['account']}")
+
   return render_template(
     "create-capsul.html",
     created_os=created_os,
+    capacity_avaliable=capacity_avaliable,
     account_balance=format(account_balance, '.2f'),
     ssh_public_keys=ssh_public_keys,
     ssh_public_key_count=len(ssh_public_keys),

capsulflask/metrics.py

@@ -181,6 +181,7 @@ def draw_plot_png_bytes(data, scale, size_x=3, size_y=1):
     my_plot.xaxis.set_major_formatter(day_formatter)
 
   max_value = reduce(lambda a, b: a if a > b else b, y, scale)
+
   average=(sum(y)/len(y))/scale
   average=average*1.25+0.1
 
@@ -195,11 +196,8 @@ def draw_plot_png_bytes(data, scale, size_x=3, size_y=1):
   my_plot.fill_between( x, y, color=highlight_color, alpha=0.3)
   my_plot.plot(x, y, 'r-', color=highlight_color)
 
-  my_plot.patch.set_facecolor('red')
-  my_plot.patch.set_alpha(0.5)
-
   if size_y < 4:
-    my_plot.set_yticks([0, scale*0.5, scale])
+    my_plot.set_yticks([0, scale])
     my_plot.set_ylim(0, scale)
 
   my_plot.xaxis.label.set_color(highlight_color)

capsulflask/schema_migrations/02_up_accounts_vms_etc.sql

@@ -71,7 +71,7 @@ CREATE TABLE stripe_checkout_sessions (
 
 INSERT INTO os_images (id, template_image_file_name, description)
 VALUES  ('alpine311', 'alpine-cloud-2020-04-18.qcow2', 'Alpine Linux 3.11'),
-        ('ubuntu18', 'ubuntu-18.04-minimal-cloudimg-amd64.img', 'Ubuntu 18.04 LTS (Bionic Beaver)'),
+        ('ubuntu18', 'ubuntu-18.04-minimal-cloudimg-amd64.img', 'Ubuntu 18.04 LTS (Bionic)'),
         ('debian10', 'debian-10-genericcloud-amd64-20191117-80.qcow2', 'Debian 10 (Buster)'),
         ('centos7', 'CentOS-7-x86_64-GenericCloud.qcow2', 'CentOS 7'),
         ('centos8', 'CentOS-8-GenericCloud-8.1.1911-20200113.3.x86_64.qcow2', 'CentOS 8'),
@@ -86,6 +86,7 @@ VALUES  ('f1-s',    5.33,   512, 1,   500),
         ('f1-xx',  29.66,  8192, 4,  8000),
         ('f1-xxx', 57.58, 16384, 8, 16000);
 
+-- this is test data to be removed later 
 INSERT INTO accounts (email)
 VALUES  ('forest.n.johnson@gmail.com');
 

capsulflask/shell_scripts/capacity-avaliable.sh

@@ -0,0 +1,25 @@
+#!/bin/sh
+
+## check avaliable RAM and IPv4s
+
+RAM_BYTES_TO_ALLOCATE="$1"
+
+if echo "$RAM_BYTES_TO_ALLOCATE" | grep -vqE "^[0-9]+$"; then 
+  echo "RAM_BYTES_TO_ALLOCATE \"$RAM_BYTES_TO_ALLOCATE\" must be an integer"
+  exit 1
+fi
+
+#100GB
+RAM_LIMIT=100000000000
+
+## compare current allocated ram + RAM_BYTES_TO_ALLOCATE with RAM_LIMIT
+
+IPV4_LIMIT=26
+IPV4_COUNT=$(grep ip-add /var/lib/libvirt/dnsmasq/virbr1.status | wc -l)
+
+if [ $IPV4_COUNT -gt $IPV4_LIMIT ]; then
+  echo "IPv4 address limit reached"
+  exit 1
+fi
+ 
+ echo "yes"

capsulflask/shell_scripts/destroy.sh

@@ -10,7 +10,7 @@ three_dots() {
 
 vmname="$1"
 
-if echo "$vmname" | grep -vqE '^capsul-[a-z0-9]{10}$'; then
+if echo "$vmname" | grep -vqE '^(cvm|capsul)-[a-z0-9]{10}$'; then
   echo "vmname $vmname must match "'"^capsul-[a-z0-9]{10}$"'
   exit 1
 fi

capsulflask/shell_scripts/get.sh

@@ -2,7 +2,7 @@
 
 vmname="$1"
 
-if echo "$vmname" | grep -vqE '^capsul-[a-z0-9]{10}$'; then
+if echo "$vmname" | grep -vqE '^(cvm|capsul)-[a-z0-9]{10}$'; then
   echo "vmname $vmname must match "'"^capsul-[a-z0-9]{10}$"'
   exit 1
 fi

capsulflask/shell_scripts/list-ids.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+virsh list --all | grep running | grep -v ' Id' | grep -v -- '----' | awk '{print $2}' | sort

capsulflask/templates/create-capsul.html

@@ -27,10 +27,11 @@
       (Must be funded enough to last at least one month at creation time).
     </p> 
     <p>You must <a href="/console/account-balance">add funds to your account</a> before you can create a Capsul.</p>
-  {% else %}
-    {% if no_ssh_public_keys  %} 
+  {% elif no_ssh_public_keys %}
     <p>You don't have any ssh public keys yet.</p> 
     <p>You must <a href="/console/ssh">upload one</a> before you can create a Capsul.</p>
+  {% elif not capacity_avaliable %}
+    <p>Host(s) at capacity. No capsuls can be created at this time. sorry. </p> 
   {% else %}
     <pre>
       CAPSUL SIZES
@@ -85,8 +86,6 @@
   {% endif %}
 
 {% endif %}
-
-{% endif %}
 </div></div>
 {% endblock %}
 

capsulflask/virt_model.py

@@ -9,7 +9,7 @@ from subprocess import run
 from capsulflask.db import get_model
 
 def validate_capsul_id(id):
-  if not re.match(r"^capsul-[a-z0-9]{10}$", id):
+  if not re.match(r"^(cvm|capsul)-[a-z0-9]{10}$", id):
     raise ValueError(f"vm id \"{id}\" must match \"^capsul-[a-z0-9]{{10}}$\"")
 
 class VirtualMachine:
@@ -19,6 +19,9 @@ class VirtualMachine:
     self.ipv6 = ipv6
 
 class VirtualizationInterface:
+  def capacity_avaliable(self, additional_ram_bytes: int) -> bool:
+    pass
+
   def get(self, id: str) -> VirtualMachine:
     pass
 
@@ -32,6 +35,9 @@ class VirtualizationInterface:
     pass
 
 class MockVirtualization(VirtualizationInterface):
+  def capacity_avaliable(self, additional_ram_bytes):
+    return True
+
   def get(self, id):
     validate_capsul_id(id)
     return VirtualMachine(id, ipv4="1.1.1.1")
@@ -63,6 +69,27 @@ class ShellScriptVirtualization(VirtualizationInterface):
         {completedProcess.stderr}
       """)
 
+  def capacity_avaliable(self, additional_ram_bytes):
+    my_args=[join(current_app.root_path, 'shell_scripts/capacity-avaliable.sh'), additional_ram_bytes]
+    completedProcess = run(my_args, capture_output=True)
+
+    if completedProcess.returncode != 0:
+      print(f"""
+      capacity-avaliable.sh exited {completedProcess.returncode} with
+        stdout:
+        {completedProcess.stdout}
+        stderr:
+        {completedProcess.stderr}
+      """)
+      return False
+
+    lines = completedProcess.stdout.splitlines()
+    if not lines[len(lines)-1] == "yes":
+      print("capacity-avaliable.sh exited 0 but did not return \"yes\" ")
+      return False
+
+    return True
+
   def get(self, id):
     validate_capsul_id(id)
     completedProcess = run([join(current_app.root_path, 'shell_scripts/get.sh'), id], capture_output=True)
@@ -75,7 +102,7 @@ class ShellScriptVirtualization(VirtualizationInterface):
     return VirtualMachine(id, ipv4=lines[0])
 
   def list_ids(self) -> list:
-    completedProcess = run([join(current_app.root_path, 'shell_scripts/list_ids.sh')], capture_output=True)
+    completedProcess = run([join(current_app.root_path, 'shell_scripts/list-ids.sh')], capture_output=True)
     self.validate_completed_process(completedProcess)
     return completedProcess.stdout.splitlines()
 

setup.cfg

@@ -14,4 +14,10 @@ packages = find:
 include_package_data = true
 install_requires =
     Flask
+    Flask-Mail
     psycopg2
+    nanoid
+    matplotlib
+    stripe
+    python-dotenv
+    requests