2020 Ondrej Sika <[email protected]>
https://github.com/ondrejsika/workshop-custom-terraform-provider
Alias: sika.link/if20-terraform
- Demo Cloud Provider (Api Server) - https://github.com/ondrejsika/demo-cloud-provider
- Terraform Provider for Demo Cloud (our target) - https://github.com/ondrejsika/terraform-provider-demo
API Server - https://github.com/ondrejsika/demo-cloud-provider/blob/master/server.py
Run it locally:
docker run -p 8000:8000 ondrejsika/demo-cloud-provider
Demo cloud has two resources: Box and Text
You can create a box and put some texts into box:
You can try it by curl:
curl -X POST --data '{"name": "Hello Box"}' -H Content-Type:application/json http://127.0.0.1:8000/v1/box/
curl -X POST --data '{"text": "Hello"}' -H Content-Type:application/json http://127.0.0.1:8000/v1/box/1/text/
curl -X POST --data '{"text": "World"}' -H Content-Type:application/json http://127.0.0.1:8000/v1/box/1/text/
Check the http://127.0.0.1:8000/
See your objects? Let's update them:
curl -X PUT --data '{"text": "Ahoj"}' -H Content-Type:application/json http://127.0.0.1:8000/v1/box/1/text/1/
curl -X PUT --data '{"text": "Svete"}' -H Content-Type:application/json http://127.0.0.1:8000/v1/box/1/text/2/
Check the http://127.0.0.1:8000/ again
Response:
[
{"id": 1, "name": "Box 1"},
{"id": 2, "name": "Box 2"}
]Request:
{"name": "Box 1"}Response:
{"box_id": 1}Response:
{"id": 1, "name": "Box 1"}Request:
{"name": "Box 1 Update"}Response:
{"ok": true}Response:
{"ok": true}Response:
[
{"id": 1, "box_id": 1, "text": "Text 1"},
{"id": 2, "box_id": 1, "text": "Text 2"}
]Request:
{"text": "Text 1"}Response:
{"text_id": 1}Response:
{"id": 1, "box_id": 1, "text": "Text 1"}Request:
{"text": "Text 1 Update"}Response:
{"ok": true}Response:
{"ok": true}Create a project directory
cd ~/go
mkdir -p src/github.com/ondrejsika/terraform-provider-demo
cd src/github.com/ondrejsika/terraform-provider-demo
Create gitignore:
# .gitignore
.VS_Code
.DS_Store
.terraform
terraform.tfstate*
terraform-provider-demoInit Go module
go mod init
See go.mod:
cat go.mod
Download helpers:
wget https://raw.githubusercontent.com/ondrejsika/terraform-provider-demo/master/api.go
We use Resty library, we have to install it:
go get github.com/go-resty/resty/v2
go mod tidy
go mod vendor
See go.mod and go.sum:
cat go.mod
cat go.sum
Create an example main.go:
// main.go
package main
import "fmt"
func main(){
res, _ := GetApi("http://127.0.0.1:8000/", "xxx", "/v1/box/")
fmt.Println(res)
}Try our API Helpers:
go build && ./terraform-provider-demo
wget https://raw.githubusercontent.com/ondrejsika/terraform-provider-demo/master/box_api.go
wget https://raw.githubusercontent.com/ondrejsika/terraform-provider-demo/master/text_api.go
Create an example main.go:
// main.go
package main
import "fmt"
func main(){
res, _ := ListBoxesApi("http://127.0.0.1:8000/", "xxx")
fmt.Println(res)
}Try our API:
go build && ./terraform-provider-demo
Download a Terraform Provider files:
wget https://raw.githubusercontent.com/ondrejsika/terraform-provider-demo/master/resource_text.go
wget https://raw.githubusercontent.com/ondrejsika/terraform-provider-demo/master/resource_box.go
wget https://raw.githubusercontent.com/ondrejsika/terraform-provider-demo/master/provider.go
rm main.go
wget https://raw.githubusercontent.com/ondrejsika/terraform-provider-demo/master/main.go
//terraform.tf
provider "demo" {
api_origin = "https://demo-cloud-prod.panda.k8s.oxs.cz"
token = "xxx"
}
resource "demo_box" "primary" {
name = "Primary Box"
}
resource "demo_text" "hello" {
box_id = demo_box.primary.id
text = "This is my first box"
}
resource "demo_text" "foo" {
box_id = demo_box.primary.id
text = "Foo bar ..."
}
resource "demo_box" "secondary" {
name = "Secondary Box"
}
resource "demo_text" "secondary" {
box_id = demo_box.secondary.id
text = "..."
}Build, init, and apply Terraform configuration
go build && terraform && terraform apply
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