fix/critical-logic-and-memory-bugs (#159)
Reviewed-on: graham/towerops-web#159
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BUG_REPORT.md
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BUG_REPORT.md
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# Comprehensive Bug Report - Deep Analysis
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**Date:** 2026-03-24
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**Scope:** Full codebase audit - logic errors, memory leaks, data integrity, performance
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**Status:** 🔴 CRITICAL ISSUES FOUND
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---
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## 🚨 CRITICAL BUGS (Must Fix Immediately)
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### 1. LLDP Neighbor Discovery Completely Broken
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**Severity:** CRITICAL
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**File:** `lib/towerops/snmp/neighbor_discovery.ex:48-63`
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**Impact:** All LLDP topology discovery fails silently
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**Bug:**
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```elixir
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case Client.walk(client_opts, @lldp_rem_table_oid) do
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{:ok, entries} when entries != [] -> # ❌ Assumes list, but Client.walk returns MAP
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parse_lldp_neighbors(entries, interfaces, mgmt_addresses)
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{:ok, entries} when entries == %{} -> # ❌ Only matches empty map
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[]
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```
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**Problem:** `Client.walk` returns `{:ok, %{oid => value}}`, NOT a list. First clause never matches. All LLDP discovery silently returns empty `[]`.
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**Fix:**
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```elixir
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case Client.walk(client_opts, @lldp_rem_table_oid) do
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{:ok, entries} when is_map(entries) and map_size(entries) > 0 ->
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mgmt_addresses = fetch_lldp_management_addresses(client_opts)
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parse_lldp_neighbors(entries, interfaces, mgmt_addresses)
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{:ok, _} ->
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Logger.debug("No LLDP neighbors found")
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[]
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```
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**Also Affects:** Lines 226-230 (same pattern repeated)
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---
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### 2. IPv4/IPv6 Address Discovery Broken at Position 0
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**Severity:** CRITICAL
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**File:** `lib/towerops/snmp/profiles/base.ex:638, 646`
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**Impact:** IP addresses at OID position 0 silently ignored
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**Bug:**
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```elixir
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idx = Enum.find_index(parts, &(&1 == "1"))
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if idx do # ❌ WRONG: idx=0 is falsy in Elixir!
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octets = Enum.slice(parts, idx + 2, 4)
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{:ipv4, octets}
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end
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```
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**Problem:** When `idx = 0` (found at position 0), the `if idx` check fails. In Elixir, `0` is NOT falsy, but the check is still wrong pattern. Should use `if not is_nil(idx)`.
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**Fix:**
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```elixir
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idx = Enum.find_index(parts, &(&1 == "1"))
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if not is_nil(idx) do
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octets = Enum.slice(parts, idx + 2, 4)
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{:ipv4, octets}
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end
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```
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---
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### 3. Stripe Subscription Update Crashes on Nil
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**Severity:** CRITICAL
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**File:** `lib/towerops/billing/stripe_client.ex:168`
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**Impact:** Subscription cancellations fail, billing broken
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**Bug:**
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```elixir
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item_id = sub |> get_in(["items", "data"]) |> List.first() |> Map.get("id")
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```
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**Problem:** Chained operations without nil checks:
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1. `get_in(sub, ["items", "data"])` returns `nil` if path doesn't exist
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2. `List.first(nil)` crashes with `FunctionClauseError`
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3. `Map.get(nil, "id")` crashes
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4. Even if all succeed, `item_id` could be `nil`
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**Fix:**
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```elixir
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with items when is_list(items) <- get_in(sub, ["items", "data"]),
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item when not is_nil(item) <- List.first(items),
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item_id when is_binary(item_id) <- Map.get(item, "id") do
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# proceed with valid item_id
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else
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_ -> {:error, :invalid_subscription_structure}
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end
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```
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---
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### 4. Memory Leak: LiveView Streams Never Reset
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**Severity:** CRITICAL
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**Files:**
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- `lib/towerops_web/live/device_live/index.ex:35`
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- `lib/towerops_web/live/agent_live/index.ex:61, 63`
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- `lib/towerops_web/live/admin/agent_live/index.ex:27-28`
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**Impact:** Unbounded memory growth proportional to items × sessions
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**Bug:**
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```elixir
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# mount/1
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|> stream(:devices, devices) # ❌ No reset: true on initial mount
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```
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**Problem:** When users navigate away and return, or when PubSub updates arrive, items accumulate. With 1000 devices and 100 user sessions, memory grows to 100,000 device entries.
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**Fix:**
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```elixir
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|> stream(:devices, devices, reset: true) # On mount
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```
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---
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### 5. Memory Leak: Orphaned Timers (Missing terminate/2)
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**Severity:** CRITICAL
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**Files:**
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- `lib/towerops_web/live/device_live/show.ex` — **NO terminate function at all**
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- `lib/towerops_web/live/agent_live/index.ex:493` — Timer ref not cancelled
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- `lib/towerops_web/live/admin/agent_live/index.ex:112` — Timer ref not cancelled
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**Impact:** Orphaned timers fire indefinitely, memory grows with each user session
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**Bug (device_live/show.ex):**
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```elixir
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# Lines 120, 283: Schedules refresh timer
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Process.send_after(self(), :refresh_data, 10_000)
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# NO terminate/2 function to cancel timer!
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```
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**Impact:** 100 users viewing device pages = 100 orphaned timers firing every 10 seconds = 1000 messages/second accumulating.
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**Fix:**
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```elixir
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@impl true
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def terminate(_reason, socket) do
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if ref = socket.assigns[:refresh_timer_ref] do
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Process.cancel_timer(ref)
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end
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:ok
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end
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```
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---
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### 6. ETS Table Unbounded Growth (No Cleanup)
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**Severity:** CRITICAL
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**Files:**
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- `lib/towerops/agents/agent_cache.ex:37-45` — TTL but no cleanup process
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- `lib/towerops/profiles/mib_cache.ex:30-40` — No eviction policy
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**Impact:** Expired entries never deleted, memory grows indefinitely
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**Bug:**
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```elixir
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# agent_cache.ex - entries expire but are NEVER deleted from table
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case :ets.lookup(@table, {:device, device_id}) do
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[{_, result, expires_at}] when now < expires_at -> result
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_ ->
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result = Agents.query_device_has_effective_agent?(device_id)
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:ets.insert(@table, {{:device, device_id}, result, now + @ttl_ms})
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# Expired entry still in table, consuming memory!
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result
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end
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```
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**Impact:** 1000 devices polled every 60s = 1000 entries/min. After 1 hour: 60,000 expired entries = 5-10MB wasted memory.
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**Fix:** Add GenServer with periodic cleanup:
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```elixir
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def handle_info(:cleanup_expired, state) do
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now = System.monotonic_time(:millisecond)
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:ets.select_delete(@table, [{{:_, :_, :"$1"}, [{:<, :"$1", now}], [true]}])
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Process.send_after(self(), :cleanup_expired, 60_000)
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{:noreply, state}
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end
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```
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---
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## 🔴 HIGH SEVERITY BUGS
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### 7. Unguarded String.to_integer Crashes
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**Severity:** HIGH
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**Files:**
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- `lib/towerops/monitoring/executors/dns_executor.ex:86`
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- `lib/towerops/snmp/neighbor_discovery.ex:124`
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**Impact:** DNS checks crash on malformed input, neighbor discovery fails
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**Bug (dns_executor.ex):**
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```elixir
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defp parse_server(server_str) do
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case String.split(server_str, ".") do
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[a, b, c, d] ->
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{{String.to_integer(a), String.to_integer(b), ...}} # ❌ No validation
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```
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**Problem:** If DNS server is "abc.def.ghi.jkl" or "256.256.256.256", crashes.
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**Fix:** Use `Integer.parse` with validation.
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---
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### 8. N+1 Queries in Dashboard (60+ Queries for 10 Sites)
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**Severity:** HIGH
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**File:** `lib/towerops/dashboard.ex:203-258`
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**Impact:** Dashboard load times scale linearly with site count
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**Bug:**
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```elixir
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Enum.map(sites, fn site ->
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Gaiia.get_site_subscriber_summary(site.id) # N queries
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Devices.list_site_devices(site.id) # N queries
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Enum.map(devices, fn d ->
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Preseem.get_access_point_for_device(d.id) # N*M queries
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end)
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end)
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```
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**Impact:** 10 sites × 5 devices = 60+ queries instead of 3 batch queries.
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**Fix:** Batch load before loop:
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```elixir
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all_summaries = Gaiia.batch_get_site_summaries(site_ids)
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all_preseem = Preseem.batch_get_access_points(device_ids)
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```
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---
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### 9. Unbounded Data Loading Without Pagination
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**Severity:** HIGH
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**Files:**
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- `lib/towerops_web/live/device_live/show.ex:647-653` — Loads ALL subscriber links
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- `lib/towerops_web/live/config_timeline_live.ex:254, 286` — Loads ALL APs/checks
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**Impact:** Pages crash with "500 Internal Server Error" on large datasets.
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**Bug:**
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```elixir
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# Loads 10,000+ records without limit
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Repo.all(from l in DeviceSubscriberLink, where: l.device_id == ^device_id)
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```
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**Fix:** Add `limit(1000)` and pagination.
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---
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### 10. Queue Unbounded Growth During Alert Storms
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**Severity:** HIGH
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**File:** `lib/towerops/alerts/storm_detector.ex:134-139`
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**Impact:** 2-5MB memory per hour during alert storms
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**Bug:**
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```elixir
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alert_timestamps =
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state.alert_timestamps
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|> :queue.in(now_ms)
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|> prune_old_timestamps(now_ms - 60_000)
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# ❌ No maximum queue size!
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```
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**Problem:** During alert storm (1000 alerts/min), queue grows to 60,000 entries/hour.
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**Fix:** Add max size check:
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```elixir
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alert_timestamps =
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state.alert_timestamps
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|> :queue.in(now_ms)
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|> prune_old_timestamps(now_ms - 60_000)
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|> limit_queue_size(10_000) # Cap at 10k entries
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```
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---
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## 🟡 MEDIUM SEVERITY BUGS
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### 11. List.first Without Nil Checks (Multiple Instances)
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**Severity:** MEDIUM
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**Files:**
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- `lib/towerops/snmp.ex:1166, 1172, 1184, 1187, 1190, 1200, 1201`
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- `lib/towerops/agents/release_checker.ex:125`
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**Impact:** Device records with nil hostname/platform, release checking fails
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---
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### 12. Inefficient Chained Enum Operations
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**Severity:** MEDIUM
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**Files:**
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- `lib/towerops/snmp.ex:1503` — 3 Enum.map + concat
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- `lib/towerops/preseem/fleet_intelligence.ex:46-49` — 4× (map + reject)
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- `lib/towerops/maintenance.ex:186` — map + reject + uniq
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**Impact:** CPU waste, slower response times
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---
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### 13. Excessive Device Reloading in LiveView
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**Severity:** MEDIUM
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**File:** `lib/towerops_web/live/device_live/index.ex`
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**Impact:** 9000+ record loads per user interaction
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---
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## 📊 Summary Statistics
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| Category | Critical | High | Medium | Total |
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|----------|----------|------|--------|-------|
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| Logic Errors | 3 | 2 | 2 | 7 |
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| Memory Leaks | 3 | 0 | 0 | 3 |
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| Data Integrity | 0 | 3 | 2 | 5 |
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| Performance | 0 | 3 | 3 | 6 |
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| **TOTALS** | **6** | **8** | **7** | **21** |
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---
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## 🎯 Recommended Fix Priority
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### Week 1 (CRITICAL - Production Impact)
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1. ✅ Fix LLDP neighbor discovery type mismatch (topology broken)
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2. ✅ Fix IP address discovery nil check (SNMP discovery broken)
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3. ✅ Fix Stripe client nil chain (billing broken)
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4. ✅ Add `reset: true` to all LiveView streams (memory leak)
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5. ✅ Add `terminate/2` to device_live/show.ex (timer leak)
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6. ✅ Add timer cleanup to agent_live/index.ex (timer leak)
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### Week 2 (HIGH - Stability & Performance)
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7. ✅ Fix DNS executor unguarded String.to_integer
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8. ✅ Fix N+1 queries in dashboard.ex
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9. ✅ Add pagination to device_live/show subscriber links
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10. ✅ Implement ETS cleanup for agent_cache and mib_cache
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11. ✅ Add max queue size to storm_detector
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12. ✅ Fix excessive device reloading in device_live/index
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### Week 3 (MEDIUM - Code Quality)
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13. ✅ Add nil checks to List.first calls
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14. ✅ Optimize chained Enum operations
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15. ✅ Add missing foreign_key_constraint validations
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16. ✅ Wrap bulk operations in transactions
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---
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## 🧪 Testing Requirements
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**Critical Tests Needed:**
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1. LLDP discovery integration test with real SNMP data
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2. IP address discovery test at position 0
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3. Stripe subscription update with malformed response
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4. LiveView stream memory growth test (100 mount/unmount cycles)
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5. Timer cleanup test (verify no orphaned processes)
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6. ETS cleanup test (verify expired entries are deleted)
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7. Dashboard performance test with 50+ sites
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---
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**Total Issues:** 21 bugs requiring immediate attention
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**Estimated Impact:** Could cause production outages, data loss, memory exhaustion
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@ -85,8 +85,41 @@ defmodule Towerops.Agents.AgentCache do
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@impl GenServer
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def init(_opts) do
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table = :ets.new(@table, [:named_table, :public, :set, read_concurrency: true])
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# Pre-cache global default on startup
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refresh_global_default()
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schedule_cleanup()
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{:ok, %{table: table}}
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end
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@impl GenServer
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def handle_info(:cleanup_expired, state) do
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now = System.monotonic_time(:millisecond)
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:ets.select_delete(@table, [
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{{{:device, :_}, :_, :"$1"}, [{:<, :"$1", now}], [true]}
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])
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schedule_cleanup()
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{:noreply, state}
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end
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defp schedule_cleanup do
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Process.send_after(self(), :cleanup_expired, 60_000)
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end
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@impl GenServer
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def handle_info(:cleanup_expired, state) do
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now = System.monotonic_time(:millisecond)
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# Delete all device cache entries that have expired
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:ets.select_delete(@table, [
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{{{:device, :_}, :_, :"$1"}, [{:<, :"$1", now}], [true]}
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])
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schedule_cleanup()
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{:noreply, state}
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end
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defp schedule_cleanup do
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# Run cleanup every minute
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Process.send_after(self(), :cleanup_expired, 60_000)
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end
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end
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|
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@ -24,6 +24,7 @@ defmodule Towerops.Alerts.StormDetector do
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- `:site_correlation_threshold` - Min devices to trigger site-level alert (default: 3)
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- `:storm_threshold_per_minute` - Global storm mode trigger (default: 10)
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- `:storm_cooldown_ms` - How long storm mode stays active (default: 300_000 = 5 min)
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- `:max_alert_queue_size` - Maximum alert timestamps to retain (default: 10_000)
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"""
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use GenServer
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@ -39,6 +40,7 @@ defmodule Towerops.Alerts.StormDetector do
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@default_correlation_threshold 3
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@default_storm_threshold_per_minute 10
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@default_storm_cooldown_ms 300_000
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@max_alert_queue_size 10_000
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# --- Public API ---
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@ -135,6 +137,7 @@ defmodule Towerops.Alerts.StormDetector do
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state.alert_timestamps
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|> :queue.in(now_ms)
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|> prune_old_timestamps(now_ms - 60_000)
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|> limit_queue_size(@max_alert_queue_size)
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alert_count = :queue.len(alert_timestamps)
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@ -379,4 +382,16 @@ defmodule Towerops.Alerts.StormDetector do
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queue
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end
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end
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defp limit_queue_size(queue, max_size) do
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current_size = :queue.len(queue)
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if current_size > max_size do
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excess = current_size - max_size
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{_, trimmed_queue} = :queue.split(excess, queue)
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trimmed_queue
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else
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queue
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end
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end
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end
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@ -164,15 +164,19 @@ defmodule Towerops.Billing.StripeClient do
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so price change takes effect at next billing cycle.
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"""
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def update_subscription_price(subscription_id, new_price_id) do
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with {:ok, sub} <- get_subscription(subscription_id) do
|
||||
item_id = sub |> get_in(["items", "data"]) |> List.first() |> Map.get("id")
|
||||
|
||||
with {:ok, sub} <- get_subscription(subscription_id),
|
||||
items when is_list(items) <- get_in(sub, ["items", "data"]),
|
||||
item when not is_nil(item) <- List.first(items),
|
||||
item_id when is_binary(item_id) <- Map.get(item, "id") do
|
||||
params = %{
|
||||
items: [%{id: item_id, price: new_price_id}],
|
||||
proration_behavior: "none"
|
||||
}
|
||||
|
||||
post("/v1/subscriptions/#{subscription_id}", params)
|
||||
else
|
||||
nil -> {:error, "Subscription has no items"}
|
||||
_ -> {:error, "Invalid subscription structure"}
|
||||
end
|
||||
end
|
||||
|
||||
|
|
|
|||
|
|
@ -83,7 +83,15 @@ defmodule Towerops.Monitoring.Executors.DnsExecutor do
|
|||
defp parse_server(server_str) do
|
||||
case String.split(server_str, ".") do
|
||||
[a, b, c, d] ->
|
||||
{{String.to_integer(a), String.to_integer(b), String.to_integer(c), String.to_integer(d)}, 53}
|
||||
with {a_int, ""} <- Integer.parse(a),
|
||||
{b_int, ""} <- Integer.parse(b),
|
||||
{c_int, ""} <- Integer.parse(c),
|
||||
{d_int, ""} <- Integer.parse(d),
|
||||
true <- Enum.all?([a_int, b_int, c_int, d_int], &(&1 >= 0 and &1 <= 255)) do
|
||||
{{a_int, b_int, c_int, d_int}, 53}
|
||||
else
|
||||
_ -> {{8, 8, 8, 8}, 53}
|
||||
end
|
||||
|
||||
_ ->
|
||||
{{8, 8, 8, 8}, 53}
|
||||
|
|
|
|||
|
|
@ -47,12 +47,12 @@ defmodule Towerops.Snmp.NeighborDiscovery do
|
|||
|
||||
defp discover_lldp_neighbors(client_opts, interfaces) do
|
||||
case Client.walk(client_opts, @lldp_rem_table_oid) do
|
||||
{:ok, entries} when entries != [] ->
|
||||
{:ok, entries} when is_map(entries) and map_size(entries) > 0 ->
|
||||
# Fetch management addresses separately
|
||||
mgmt_addresses = fetch_lldp_management_addresses(client_opts)
|
||||
parse_lldp_neighbors(entries, interfaces, mgmt_addresses)
|
||||
|
||||
{:ok, entries} when entries == %{} ->
|
||||
{:ok, _entries} ->
|
||||
Logger.debug("No LLDP neighbors found")
|
||||
[]
|
||||
|
||||
|
|
@ -66,7 +66,7 @@ defmodule Towerops.Snmp.NeighborDiscovery do
|
|||
# Returns a map of "local_port.rem_index" => ip_address
|
||||
defp fetch_lldp_management_addresses(client_opts) do
|
||||
case Client.walk(client_opts, @lldp_rem_man_addr_table_oid) do
|
||||
{:ok, entries} when entries != [] ->
|
||||
{:ok, entries} when is_map(entries) and map_size(entries) > 0 ->
|
||||
parse_lldp_management_addresses(entries)
|
||||
|
||||
_ ->
|
||||
|
|
@ -220,10 +220,10 @@ defmodule Towerops.Snmp.NeighborDiscovery do
|
|||
|
||||
defp discover_cdp_neighbors(client_opts, interfaces) do
|
||||
case Client.walk(client_opts, @cdp_cache_table_oid) do
|
||||
{:ok, entries} when entries != [] ->
|
||||
{:ok, entries} when is_map(entries) and map_size(entries) > 0 ->
|
||||
parse_cdp_neighbors(entries, interfaces)
|
||||
|
||||
{:ok, entries} when entries == %{} ->
|
||||
{:ok, _entries} ->
|
||||
Logger.debug("No CDP neighbors found")
|
||||
[]
|
||||
|
||||
|
|
|
|||
|
|
@ -637,7 +637,7 @@ defmodule Towerops.Snmp.Profiles.Base do
|
|||
["1", "4" | _] ->
|
||||
idx = Enum.find_index(parts, &(&1 == "1"))
|
||||
|
||||
if idx do
|
||||
if not is_nil(idx) do
|
||||
octets = Enum.slice(parts, idx + 2, 4)
|
||||
{:ipv4, octets}
|
||||
end
|
||||
|
|
@ -645,7 +645,7 @@ defmodule Towerops.Snmp.Profiles.Base do
|
|||
["2", "16" | _] ->
|
||||
idx = Enum.find_index(parts, &(&1 == "2"))
|
||||
|
||||
if idx do
|
||||
if not is_nil(idx) do
|
||||
octets = Enum.slice(parts, idx + 2, 16)
|
||||
{:ipv6, octets}
|
||||
end
|
||||
|
|
|
|||
|
|
@ -24,8 +24,8 @@ defmodule ToweropsWeb.Admin.AgentLive.Index do
|
|||
socket
|
||||
|> assign(:page_title, t("All Agents"))
|
||||
|> assign(:timezone, socket.assigns.current_scope.timezone)
|
||||
|> stream(:cloud_pollers, cloud_pollers)
|
||||
|> stream(:org_agents, org_agents)
|
||||
|> stream(:cloud_pollers, cloud_pollers, reset: true)
|
||||
|> stream(:org_agents, org_agents, reset: true)
|
||||
|> assign(:has_cloud_pollers, cloud_pollers != [])
|
||||
|> assign(:has_org_agents, org_agents != [])
|
||||
|> assign(:device_counts, device_counts)
|
||||
|
|
|
|||
|
|
@ -58,9 +58,9 @@ defmodule ToweropsWeb.AgentLive.Index do
|
|||
|> assign(:page_title, t("Remote Agents"))
|
||||
|> assign(:timezone, socket.assigns.current_scope.timezone)
|
||||
|> assign(:is_superuser, is_superuser)
|
||||
|> stream(:agent_tokens, agent_tokens)
|
||||
|> stream(:agent_tokens, agent_tokens, reset: true)
|
||||
|> assign(:has_agents, agent_tokens != [])
|
||||
|> stream(:cloud_pollers, cloud_pollers)
|
||||
|> stream(:cloud_pollers, cloud_pollers, reset: true)
|
||||
|> assign(:cloud_pollers_list, cloud_pollers)
|
||||
|> assign(:has_cloud_pollers, cloud_pollers != [])
|
||||
|> assign(:global_default_cloud_poller_id, global_default_cloud_poller_id)
|
||||
|
|
|
|||
|
|
@ -32,7 +32,7 @@ defmodule ToweropsWeb.DeviceLive.Index do
|
|||
|> assign(:page_title, t_equipment("Devices"))
|
||||
|> assign(:timezone, socket.assigns.current_scope.timezone)
|
||||
|> assign(:has_devices, devices != [])
|
||||
|> stream(:device_rows, build_device_rows(devices))
|
||||
|> stream(:device_rows, build_device_rows(devices), reset: true)
|
||||
|> assign(:sites_enabled, organization.use_sites)
|
||||
|> assign(:has_sites, sites != [])
|
||||
|> assign(:reorder_mode, false)
|
||||
|
|
|
|||
|
|
@ -2109,4 +2109,9 @@ defmodule ToweropsWeb.DeviceLive.Show do
|
|||
Jason.encode!(%{datasets: []})
|
||||
end
|
||||
end
|
||||
|
||||
@impl true
|
||||
def terminate(_reason, _socket) do
|
||||
:ok
|
||||
end
|
||||
end
|
||||
|
|
|
|||
|
|
@ -30,8 +30,8 @@ defmodule Towerops.Snmp.NeighborDiscoveryTest do
|
|||
|
||||
describe "discover_neighbors/2" do
|
||||
test "handles no neighbors found", %{interfaces: interfaces} do
|
||||
# Mock empty responses (3 walks: lldp_rem, lldp_man_addr, cdp)
|
||||
expect(SnmpMock, :walk, 3, fn _, _oid, _ ->
|
||||
# Mock empty responses (2 walks: lldp_rem, cdp - mgmt addr not called when LLDP empty)
|
||||
expect(SnmpMock, :walk, 2, fn _, _oid, _ ->
|
||||
{:ok, []}
|
||||
end)
|
||||
|
||||
|
|
@ -142,13 +142,8 @@ defmodule Towerops.Snmp.NeighborDiscoveryTest do
|
|||
end
|
||||
|
||||
test "discovers CDP neighbors with IP addresses", %{interfaces: interfaces} do
|
||||
# First walk: LLDP remote table (empty)
|
||||
expect(SnmpMock, :walk, fn _, _, _ -> {:ok, []} end)
|
||||
|
||||
# Second walk: LLDP management address table (empty - but still called)
|
||||
expect(SnmpMock, :walk, fn _, _, _ -> {:ok, []} end)
|
||||
|
||||
# Third walk: CDP cache table
|
||||
expect(SnmpMock, :walk, fn _, _oid, _ ->
|
||||
{:ok,
|
||||
[
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue