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Merged
rafaeelaudibert merged 5 commits into from
Feb 5, 2026
Merged

feat: add UUID generation for events to ensure idempotency #76

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5fec2fd
feat: add UUID generation for events to ensure idempotency
rafaeelaudibert Feb 5, 2026
29cd90b
refactor: mix format
rafaeelaudibert Feb 5, 2026
be67102
refactor: Improve LLM changesets
rafaeelaudibert Feb 5, 2026
26dfdc9
refactor: Use uuid_v7 dependency
rafaeelaudibert Feb 5, 2026
91b210d
fix: Fix `mix credo` output
rafaeelaudibert Feb 5, 2026
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4 changes: 3 additions & 1 deletion .sampo/changesets/heroic-bard-ilmarinen.md
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Original file line number Diff line number Diff line change
Expand Up @@ -2,4 +2,6 @@
hex/posthog: minor
---

Add LLMAnalytics (experimental)
Add LLM Analytics

This release introduces a lightweight LLM analytics toolkit for instrumenting, recording, and analyzing large language model usage across applications that use this repository's SDK. It provides practical observability for teams running LLMs in production and during development.
5 changes: 5 additions & 0 deletions .sampo/changesets/majestic-seer-goulven.md
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@@ -0,0 +1,5 @@
---
hex/posthog: minor
---

Add `uuid` to events on every request to guarantee idempotency in the backend
1 change: 1 addition & 0 deletions lib/posthog.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -73,6 +73,7 @@ defmodule PostHog do
event = %{
event: event,
distinct_id: distinct_id,
uuid: UUIDv7.generate(),
timestamp: DateTime.utc_now() |> DateTime.to_iso8601(),
properties: properties
}
Expand Down
13 changes: 7 additions & 6 deletions test/integration_test.exs
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@ defmodule PostHog.IntegrationTest do

require Logger

alias PostHog.Integrations.LLMAnalytics.Req, as: LLMReq
alias PostHog.LLMAnalytics

@moduletag integration: true
Expand Down Expand Up @@ -102,7 +103,7 @@ defmodule PostHog.IntegrationTest do

test "OpenAI Responses", %{wait_fun: wait} do
Req.new()
|> PostHog.Integrations.LLMAnalytics.Req.attach()
|> LLMReq.attach()
|> Req.post!(
url: "https://api.openai.com/v1/responses",
auth: {:bearer, Application.get_env(:posthog, :openai_key)},
Expand All @@ -117,7 +118,7 @@ defmodule PostHog.IntegrationTest do

test "OpenAI Chat Completions", %{wait_fun: wait} do
Req.new()
|> PostHog.Integrations.LLMAnalytics.Req.attach()
|> LLMReq.attach()
|> Req.post!(
url: "https://api.openai.com/v1/chat/completions",
auth: {:bearer, Application.get_env(:posthog, :openai_key)},
Expand All @@ -137,7 +138,7 @@ defmodule PostHog.IntegrationTest do

test "OpenAI Responses with tool", %{wait_fun: wait} do
Req.new()
|> PostHog.Integrations.LLMAnalytics.Req.attach()
|> LLMReq.attach()
|> Req.post!(
url: "https://api.openai.com/v1/responses",
auth: {:bearer, Application.get_env(:posthog, :openai_key)},
Expand Down Expand Up @@ -173,7 +174,7 @@ defmodule PostHog.IntegrationTest do

test "OpenAI Chat Completions with tool", %{wait_fun: wait} do
Req.new()
|> PostHog.Integrations.LLMAnalytics.Req.attach()
|> LLMReq.attach()
|> Req.post!(
url: "https://api.openai.com/v1/chat/completions",
auth: {:bearer, Application.get_env(:posthog, :openai_key)},
Expand Down Expand Up @@ -211,7 +212,7 @@ defmodule PostHog.IntegrationTest do

test "Gemini", %{wait_fun: wait} do
Req.new()
|> PostHog.Integrations.LLMAnalytics.Req.attach()
|> LLMReq.attach()
|> Req.post!(
url: "https://generativelanguage.googleapis.com/v1beta/models/{model}:generateContent",
headers: [{"x-goog-api-key", Application.get_env(:posthog, :gemini_key)}],
Expand All @@ -231,7 +232,7 @@ defmodule PostHog.IntegrationTest do

test "Gemini with tool", %{wait_fun: wait} do
Req.new()
|> PostHog.Integrations.LLMAnalytics.Req.attach()
|> LLMReq.attach()
|> Req.post!(
url: "https://generativelanguage.googleapis.com/v1beta/models/{model}:generateContent",
headers: [{"x-goog-api-key", Application.get_env(:posthog, :gemini_key)}],
Expand Down
10 changes: 10 additions & 0 deletions test/posthog/handler_test.exs
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@ defmodule PostHog.HandlerTest do

assert %{
event: "$exception",
uuid: _,
distinct_id: "foo",
properties: %{
"$exception_list": [
Expand All @@ -45,6 +46,7 @@ defmodule PostHog.HandlerTest do

assert %{
event: "$exception",
uuid: _,
properties: %{
"$lib": "posthog-elixir",
"$lib_version": _,
Expand Down Expand Up @@ -83,6 +85,7 @@ defmodule PostHog.HandlerTest do

assert %{
event: "$exception",
uuid: _,
properties: %{
"$exception_list": [
%{
Expand All @@ -103,6 +106,7 @@ defmodule PostHog.HandlerTest do

assert %{
event: "$exception",
uuid: _,
properties: %{
"$exception_list": [
%{
Expand All @@ -123,6 +127,7 @@ defmodule PostHog.HandlerTest do

assert %{
event: "$exception",
uuid: _,
properties: %{
"$exception_list": [
%{
Expand All @@ -143,6 +148,7 @@ defmodule PostHog.HandlerTest do

assert %{
event: "$exception",
uuid: _,
properties: %{
"$exception_list": [
%{
Expand Down Expand Up @@ -189,6 +195,7 @@ defmodule PostHog.HandlerTest do

assert %{
event: "$exception",
uuid: _,
properties: %{
"$exception_list": [
%{
Expand All @@ -209,6 +216,7 @@ defmodule PostHog.HandlerTest do

assert %{
event: "$exception",
uuid: _,
properties: %{
"$exception_list": [
%{
Expand All @@ -229,6 +237,7 @@ defmodule PostHog.HandlerTest do

assert %{
event: "$exception",
uuid: _,
properties: %{
"$exception_list": [
%{
Expand All @@ -249,6 +258,7 @@ defmodule PostHog.HandlerTest do

assert %{
event: "$exception",
uuid: _,
properties: %{
"$exception_list": [
%{
Expand Down
6 changes: 6 additions & 0 deletions test/posthog/integrations/plug_test.exs
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Original file line number Diff line number Diff line change
Expand Up @@ -49,6 +49,7 @@ defmodule PostHog.Integrations.PlugTest do

assert %{
event: "$exception",
uuid: _,
properties: properties
} = event

Expand Down Expand Up @@ -79,6 +80,7 @@ defmodule PostHog.Integrations.PlugTest do

assert %{
event: "$exception",
uuid: _,
properties: properties
} = event

Expand Down Expand Up @@ -109,6 +111,7 @@ defmodule PostHog.Integrations.PlugTest do

assert %{
event: "$exception",
uuid: _,
properties: properties
} = event

Expand Down Expand Up @@ -139,6 +142,7 @@ defmodule PostHog.Integrations.PlugTest do

assert %{
event: "$exception",
uuid: _,
properties: properties
} = event

Expand Down Expand Up @@ -168,6 +172,7 @@ defmodule PostHog.Integrations.PlugTest do

assert %{
event: "$exception",
uuid: _,
properties: properties
} = event

Expand Down Expand Up @@ -197,6 +202,7 @@ defmodule PostHog.Integrations.PlugTest do

assert %{
event: "$exception",
uuid: _,
properties: properties
} = event

Expand Down
21 changes: 21 additions & 0 deletions test/posthog_test.exs
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,7 @@ defmodule PostHogTest do

assert %{
event: "case tested",
uuid: _,
distinct_id: "distinct_id",
properties: %{},
timestamp: _
Expand All @@ -42,6 +43,7 @@ defmodule PostHogTest do

assert %{
event: "case tested",
uuid: _,
distinct_id: "distinct_id",
properties: %{foo: "bar"},
timestamp: _
Expand All @@ -59,6 +61,7 @@ defmodule PostHogTest do

assert %{
event: "case tested",
uuid: _,
distinct_id: "distinct_id",
properties: %{
egg: "spam",
Expand All @@ -80,6 +83,7 @@ defmodule PostHogTest do

assert %{
event: "case tested",
uuid: _,
distinct_id: "distinct_id",
properties: %{},
timestamp: _
Expand All @@ -94,6 +98,7 @@ defmodule PostHogTest do

assert %{
event: "case tested",
uuid: _,
distinct_id: "distinct_id",
properties: %{foo: "bar"},
timestamp: _
Expand All @@ -120,13 +125,27 @@ defmodule PostHogTest do

assert %{
event: "case tested",
uuid: _,
distinct_id: "distinct_id",
properties: %{struct: %{hello: nil}, ref: _} = properties,
timestamp: _
} = event

Jason.encode!(properties)
end

test "uuid is valid v7" do
PostHog.bare_capture("uuid test", "distinct_id")

assert [event] = all_captured()

assert is_binary(event.uuid)

assert Regex.match?(
~r/^[0-9a-f]{8}-[0-9a-f]{4}-7[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i,
event.uuid
)
end
end

describe "capture/4" do
Expand All @@ -137,6 +156,7 @@ defmodule PostHogTest do

assert %{
event: "case tested",
uuid: _,
distinct_id: "distinct_id",
properties: %{},
timestamp: _
Expand All @@ -154,6 +174,7 @@ defmodule PostHogTest do

assert %{
event: "case tested",
uuid: _,
distinct_id: "distinct_id",
properties: %{foo: "bar"},
timestamp: _
Expand Down
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