allisson/postmand
Simple webhook delivery system powered by Golang and PostgreSQL.
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allisson/postmand repository overview
postmand
Simple webhook delivery system powered by Golang and PostgreSQL.
Features
- Simple rest api with only three endpoints (webhooks/deliveries/delivery-attempts).
- Select the status codes that are considered valid for a delivery.
- Control the maximum amount of delivery attempts and delay between these attempts (min and max backoff).
- Locks control of worker deliveries using PostgreSQL SELECT FOR UPDATE SKIP LOCKED.
- Sending the X-Hub-Signature header if the webhook is configured with a secret token.
- Simplicity, it does the minimum necessary, it will not have authentication/permission scheme among other things, the idea is to use it internally in the cloud and not leave exposed.
Quickstart
Let's start with the basic concepts, we have three main entities that we must know to start:
- Webhook: The configuration of the webhook.
- Delivery: The content sent to a webhook.
- Delivery Attempt: An attempt to deliver the content to the webhook.
Run the server
To run the server it is necessary to have a database available from postgresql, in this example we will consider that we have a database called postmand running in localhost with user and password equal to user.
Docker
docker run --rm --env POSTMAND_DATABASE_URL='postgres://user:[email protected]:5432/postmand?sslmode=disable' allisson/postmand migrate # create database schema
docker run -p 8000:8000 -p 8001:8001 --env POSTMAND_DATABASE_URL='postgres://user:[email protected]:5432/postmand?sslmode=disable' allisson/postmand server # run the server
Local
git clone https://github.com/allisson/postmand
cd postmand
cp local.env .env # and edit .env
make run-migrate # create database schema
make run-server # run the server
Run the worker
The worker is responsible to delivery content to the webhooks.
Docker
docker run --env POSTMAND_DATABASE_URL='postgres://user:[email protected]:5432/postmand?sslmode=disable' allisson/postmand worker
Local
make run-worker
go run cmd/postmand/main.go worker
Create a new webhook
The fields delivery_attempt_timeout/retry_min_backoff/retry_max_backoff are in seconds.
curl --location --request POST 'http://localhost:8000/v1/webhooks' \
--header 'Content-Type: application/json' \
--data-raw '{
"name": "Httpbin Post",
"url": "https://httpbin.org/post",
"content_type": "application/json",
"valid_status_codes": [
200,
201
],
"secret_token": "my-secret-token",
"active": true,
"max_delivery_attempts": 5,
"delivery_attempt_timeout": 1,
"retry_min_backoff": 10,
"retry_max_backoff": 60
}'
{
"id":"a6e9a525-ac5a-488c-b118-bd7327ce6d8d",
"name":"Httpbin Post",
"url":"https://httpbin.org/post",
"content_type":"application/json",
"valid_status_codes":[
200,
201
],
"secret_token":"my-secret-token",
"active":true,
"max_delivery_attempts":5,
"delivery_attempt_timeout":1,
"retry_min_backoff":10,
"retry_max_backoff":60,
"created_at":"2021-03-08T20:41:25.433671Z",
"updated_at":"2021-03-08T20:41:25.433671Z"
}
Create a new delivery
curl --location --request POST 'http://localhost:8000/v1/deliveries' \
--header 'Content-Type: application/json' \
--data-raw '{
"webhook_id": "a6e9a525-ac5a-488c-b118-bd7327ce6d8d",
"payload": "{\"success\": true}"
}'
{
"id":"bc76122c-e56b-45c7-8dc3-b80a861191d5",
"webhook_id":"a6e9a525-ac5a-488c-b118-bd7327ce6d8d",
"payload":"{\"success\": true}",
"scheduled_at":"2021-03-08T20:43:49.986771Z",
"delivery_attempts":0,
"status":"pending",
"created_at":"2021-03-08T20:43:49.986771Z",
"updated_at":"2021-03-08T20:43:49.986771Z"
}
Get deliveries
curl --location --request GET 'http://localhost:8000/v1/deliveries?webhook_id=a6e9a525-ac5a-488c-b118-bd7327ce6d8d'
{
"deliveries":[
{
"id":"bc76122c-e56b-45c7-8dc3-b80a861191d5",
"webhook_id":"a6e9a525-ac5a-488c-b118-bd7327ce6d8d",
"payload":"{\"success\": true}",
"scheduled_at":"2021-03-08T20:43:49.986771Z",
"delivery_attempts":1,
"status":"succeeded",
"created_at":"2021-03-08T20:43:49.986771Z",
"updated_at":"2021-03-08T20:46:51.674623Z"
}
],
"limit":50,
"offset":0
}
Get delivery
curl --location --request GET 'http://localhost:8000/v1/deliveries/bc76122c-e56b-45c7-8dc3-b80a861191d5'
{
"id":"bc76122c-e56b-45c7-8dc3-b80a861191d5",
"webhook_id":"a6e9a525-ac5a-488c-b118-bd7327ce6d8d",
"payload":"{\"success\": true}",
"scheduled_at":"2021-03-08T20:43:49.986771Z",
"delivery_attempts":1,
"status":"succeeded",
"created_at":"2021-03-08T20:43:49.986771Z",
"updated_at":"2021-03-08T20:46:51.674623Z"
}
Get delivery attempts
curl --location --request GET 'http://localhost:8000/v1/delivery-attempts?delivery_id=bc76122c-e56b-45c7-8dc3-b80a861191d5'
{
"delivery_attempts":[
{
"id":"d72719d6-5a79-4df7-a2c2-2029ab0e1848",
"webhook_id":"a6e9a525-ac5a-488c-b118-bd7327ce6d8d",
"delivery_id":"bc76122c-e56b-45c7-8dc3-b80a861191d5",
"raw_request":"POST /post HTTP/1.1\r\nHost: httpbin.org\r\nContent-Type: application/json\r\nX-Hub-Signature: 3fc5d4b8ff4efb404be24faf543667d29902d6a1306bd0c1ef2084497300cee9\r\n\r\n{\"success\": true}",
"raw_response":"HTTP/2.0 200 OK\r\nContent-Length: 538\r\nAccess-Control-Allow-Credentials: true\r\nAccess-Control-Allow-Origin: *\r\nContent-Type: application/json\r\nDate: Mon, 08 Mar 2021 20:46:51 GMT\r\nServer: gunicorn/19.9.0\r\n\r\n{\n \"args\": {}, \n \"data\": \"{\\\"success\\\": true}\", \n \"files\": {}, \n \"form\": {}, \n \"headers\": {\n \"Accept-Encoding\": \"gzip\", \n \"Content-Length\": \"17\", \n \"Content-Type\": \"application/json\", \n \"Host\": \"httpbin.org\", \n \"User-Agent\": \"Go-http-client/2.0\", \n \"X-Amzn-Trace-Id\": \"Root=1-60468d3b-36d312777a03ec3e1c564e3b\", \n \"X-Hub-Signature\": \"3fc5d4b8ff4efb404be24faf543667d29902d6a1306bd0c1ef2084497300cee9\"\n }, \n \"json\": {\n \"success\": true\n }, \n \"origin\": \"191.35.122.74\", \n \"url\": \"https://httpbin.org/post\"\n}\n",
"response_status_code":200,
"execution_duration":547,
"success":true,
"error":"",
"created_at":"2021-03-08T20:46:51.680846Z"
}
],
"limit":50,
"offset":0
}
Get delivery attempt
curl --location --request GET 'http://localhost:8000/v1/delivery-attempts/d72719d6-5a79-4df7-a2c2-2029ab0e1848'
{
"id":"d72719d6-5a79-4df7-a2c2-2029ab0e1848",
"webhook_id":"a6e9a525-ac5a-488c-b118-bd7327ce6d8d",
"delivery_id":"bc76122c-e56b-45c7-8dc3-b80a861191d5",
"raw_request":"POST /post HTTP/1.1\r\nHost: httpbin.org\r\nContent-Type: application/json\r\nX-Hub-Signature: 3fc5d4b8ff4efb404be24faf543667d29902d6a1306bd0c1ef2084497300cee9\r\n\r\n{\"success\": true}",
"raw_response":"HTTP/2.0 200 OK\r\nContent-Length: 538\r\nAccess-Control-Allow-Credentials: true\r\nAccess-Control-Allow-Origin: *\r\nContent-Type: application/json\r\nDate: Mon, 08 Mar 2021 20:46:51 GMT\r\nServer: gunicorn/19.9.0\r\n\r\n{\n \"args\": {}, \n \"data\": \"{\\\"success\\\": true}\", \n \"files\": {}, \n \"form\": {}, \n \"headers\": {\n \"Accept-Encoding\": \"gzip\", \n \"Content-Length\": \"17\", \n \"Content-Type\": \"application/json\", \n \"Host\": \"httpbin.org\", \n \"User-Agent\": \"Go-http-client/2.0\", \n \"X-Amzn-Trace-Id\": \"Root=1-60468d3b-36d312777a03ec3e1c564e3b\", \n \"X-Hub-Signature\": \"3fc5d4b8ff4efb404be24faf543667d29902d6a1306bd0c1ef2084497300cee9\"\n }, \n \"json\": {\n \"success\": true\n }, \n \"origin\": \"191.35.122.74\", \n \"url\": \"https://httpbin.org/post\"\n}\n",
"response_status_code":200,
"execution_duration":547,
"success":true,
"error":"",
"created_at":"2021-03-08T20:46:51.680846Z"
}
Swagger docs
The swagger spec is available at http://localhost:8000/swagger/index.html.
Health check
The health check server is running on port defined by envvar POSTMAND_HEALTH_CHECK_HTTP_PORT (defaults to 8001).
curl --location --request GET 'http://localhost:8001/healthz'
{
"success":true
}
Environment variables
All environment variables is defined on file local.env.
How to build docker image
docker build -f Dockerfile -t postmand .
Tag summary
Content type
Image
Digest
Size
14.6 MB
Last updated
over 5 years ago
docker pull allisson/postmand