08 - Variable Substitutions

There are several options available to substitute variables dynamically into your configuration file:

Static global variables
From the results of your action data
Query parameters
Body payload
Headers
Environment variables
Managed variables & secrets

We will utilize:

Variable substitutions to dynamically adjust the configuration.
http functionality to fetch the data, complete options here.

Note!

When substituting/interpolating complex data such as JSON or multiline data you should use a literal scalar block in your yaml configuration.

This is to ensure it parses correctly and does not break your configuration file.

Before

actions:
    name: send data
    http:
        url: http://endpoint123.com/someroute
        body: a|var::some_big_json| # assuming a variable called `some_big_json` is stored in the global variable store

After

actions:
    name: send data
    http:
        url: http://endpoint123.com/someroute
        body: | # <- literal scalar block used here, with the substitution is on the next line
            a|var::some_big_json| # assuming a variable called `some_big_json` is stored in the global variable store

Steps

1. Setting static global variables

In this simple example we define a set of variables under the global section of our configuration file.

Deploy via Hosted / Managed

Ensure you are logged into https://app.airpipe.io
Click Deploy to load the below example config into your account
- Alternatively, go to Configurations > Add New, and copy and paste the example

Deploy via Self Hosted / Unmanaged

A configs directory should have been created automatically for you, else create one.
Copy the below example config into your configs directory, eg.
```
    configs/08-http-variable-subtitutions-global.yml
```

Stop/Start airpipe eg.

./airpipe server --api-key your-api-key --config-dir configs

Example Config 1

Here we've set the variable fixed_post_id to 5 this will then be substituted into the below url to fetch the 5th comment.

Deploy

HTTP GET API

loading...

View on GitHub

Test

Hosted mode, either navigate to or curl:

The load configuration UI will automatically show you what your detected routes are, you can copy this for the next steps.
The link is automatically built with your organization uuid and environment, your API endpoints can be found here if required https://app.airpipe.io/configurations.
Update the route as necessary

curl https://app.airpipe.io/your_org_uuid/staging/tutorial/variable-substitute-global

Self hosted mode, either navigate to or curl:

http://0.0.0.0:4111/tutorial/variable-substitute-global

curl http://0.0.0.0:4111/tutorial/variable-substitute-global

Response

{
    "data": {
        "GetData": {
            "data": {
                "body": {
                    "body": "harum non quasi et ratione\ntempore iure ex voluptates in ratione\nharum architecto fugit inventore cupiditate\nvoluptates magni quo et",
                    "email": "Hayden@althea.biz",
                    "id": 5,
                    "name": "vero eaque aliquid doloribus et culpa",
                    "postId": 1
                },
                "headers": {
                    "accept-ranges": "bytes",
                    "access-control-allow-credentials": "true",
                    "age": "6935",
                    "alt-svc": "h3=\":443\"; ma=86400",
                    "cache-control": "max-age=43200",
                    "cf-cache-status": "HIT",
                    "cf-ray": "88d81da728c0dfb9-SYD",
                    "content-length": "260",
                    "content-type": "application/json; charset=utf-8",
                    "date": "Sun, 02 Jun 2024 14:25:58 GMT",
                    "etag": "W/\"104-cDWxPpdnlz4RLovlbex/FGgIZek\"",
                    "expires": "-1",
                    "nel": "{\"report_to\":\"heroku-nel\",\"max_age\":3600,\"success_fraction\":0.005,\"failure_fraction\":0.05,\"response_headers\":[\"Via\"]}",
                    "pragma": "no-cache",
                    "report-to": "{\"group\":\"heroku-nel\",\"max_age\":3600,\"endpoints\":[{\"url\":\"https://nel.heroku.com/reports?ts=1717331423&sid=e11707d5-02a7-43ef-b45e-2cf4d2036f7d&s=O%2BeTaI4bAN43lDayyXrVxXhtUXkePw7NLRXTha7t8Xk%3D\"}]}",
                    "reporting-endpoints": "heroku-nel=https://nel.heroku.com/reports?ts=1717331423&sid=e11707d5-02a7-43ef-b45e-2cf4d2036f7d&s=O%2BeTaI4bAN43lDayyXrVxXhtUXkePw7NLRXTha7t8Xk%3D",
                    "server": "cloudflare",
                    "vary": "Origin, Accept-Encoding",
                    "via": "1.1 vegur",
                    "x-content-type-options": "nosniff",
                    "x-powered-by": "Express",
                    "x-ratelimit-limit": "1000",
                    "x-ratelimit-remaining": "999",
                    "x-ratelimit-reset": "1717331481"
                },
                "status": 200
            },
            "time.ms": 35
        }
    }
}

2. From action data

In this example we first query for a particular post, the, take the userId from the body of the GetPost payload with a|GetPost::body.userId|.

Deploy via Hosted / Managed

Ensure you are logged into https://app.airpipe.io
Click Deploy to load the below example config into your account
- Alternatively, go to Configurations > Add New, and copy and paste the example

Deploy via Self Hosted / Unmanaged

A configs directory should have been created automatically for you, else create one.
Copy the below example config into your configs directory, eg.
```
    configs/03-http-post-data.yml
```

Stop/Start airpipe eg.

./airpipe server --api-key your-api-key --config-dir configs

Example Config

Deploy

HTTP POST API

loading...

View on GitHub

Test

Hosted mode, curl or use your preferred API testing tool:

The load configuration UI will automatically show you what your detected routes are, you can copy this for the next steps.
The link is automatically built with your organization uuid and environment, your API endpoints can be found here if required https://app.airpipe.io/configurations.
Update the route as necessary

curl --location 'https://api.airpipe.io/your-org-uuid/staging/tutorial/variable-substitute-action' \
--header 'Content-Type: application/json' \
--data '{
    "id": 1
}'

Self hosted mode, curl or use your preferred API testing tool:

curl --location 'http://0.0.0.0:4111/tutorial/variable-substitute-action' \
--header 'Content-Type: application/json' \
--data '{
    "id": 1
}'

Response

{
    "data": {
        "GetPost": {
            "data": {
                "body": {
                    "body": "eos voluptas et aut odit natus earum\naspernatur fuga molestiae ullam\ndeserunt ratione qui eos\nqui nihil ratione nemo velit ut aut id quo",
                    "id": 17,
                    "title": "fugit voluptas sed molestias voluptatem provident",
                    "userId": 2
                },
                "headers": {
                    "accept-ranges": "bytes",
                    "access-control-allow-credentials": "true",
                    "age": "208",
                    "alt-svc": "h3=\":443\"; ma=86400",
                    "cache-control": "max-age=43200",
                    "cf-cache-status": "HIT",
                    "cf-ray": "88d962367daba89e-SYD",
                    "content-length": "246",
                    "content-type": "application/json; charset=utf-8",
                    "date": "Sun, 02 Jun 2024 18:07:32 GMT",
                    "etag": "W/\"f6-Y7y9zgdEq0WndoXZmQZBsN4+z14\"",
                    "expires": "-1",
                    "nel": "{\"report_to\":\"heroku-nel\",\"max_age\":3600,\"success_fraction\":0.005,\"failure_fraction\":0.05,\"response_headers\":[\"Via\"]}",
                    "pragma": "no-cache",
                    "report-to": "{\"group\":\"heroku-nel\",\"max_age\":3600,\"endpoints\":[{\"url\":\"https://nel.heroku.com/reports?ts=1717294800&sid=e11707d5-02a7-43ef-b45e-2cf4d2036f7d&s=oasLgQSV%2FNWbX9qMGa1VrL9Tu0RPBaIMWGSiTCiCWAw%3D\"}]}",
                    "reporting-endpoints": "heroku-nel=https://nel.heroku.com/reports?ts=1717294800&sid=e11707d5-02a7-43ef-b45e-2cf4d2036f7d&s=oasLgQSV%2FNWbX9qMGa1VrL9Tu0RPBaIMWGSiTCiCWAw%3D",
                    "server": "cloudflare",
                    "vary": "Origin, Accept-Encoding",
                    "via": "1.1 vegur",
                    "x-content-type-options": "nosniff",
                    "x-powered-by": "Express",
                    "x-ratelimit-limit": "1000",
                    "x-ratelimit-remaining": "984",
                    "x-ratelimit-reset": "1717294832"
                },
                "status": 200
            },
            "time.ms": 32
        },
        "GetUser": {
            "data": {
                "body": {
                    "address": {
                        "city": "Wisokyburgh",
                        "geo": {
                            "lat": "-43.9509",
                            "lng": "-34.4618"
                        },
                        "street": "Victor Plains",
                        "suite": "Suite 879",
                        "zipcode": "90566-7771"
                    },
                    "company": {
                        "bs": "synergize scalable supply-chains",
                        "catchPhrase": "Proactive didactic contingency",
                        "name": "Deckow-Crist"
                    },
                    "email": "Shanna@melissa.tv",
                    "id": 2,
                    "name": "Ervin Howell",
                    "phone": "010-692-6593 x09125",
                    "username": "Antonette",
                    "website": "anastasia.net"
                },
                "headers": {
                    "accept-ranges": "bytes",
                    "access-control-allow-credentials": "true",
                    "age": "19303",
                    "alt-svc": "h3=\":443\"; ma=86400",
                    "cache-control": "max-age=43200",
                    "cf-cache-status": "HIT",
                    "cf-ray": "88d96236a944aae9-SYD",
                    "content-length": "509",
                    "content-type": "application/json; charset=utf-8",
                    "date": "Sun, 02 Jun 2024 18:07:32 GMT",
                    "etag": "W/\"1fd-XTG63SYhaP/Uo6/vgmARnL3rpBk\"",
                    "expires": "-1",
                    "nel": "{\"report_to\":\"heroku-nel\",\"max_age\":3600,\"success_fraction\":0.005,\"failure_fraction\":0.05,\"response_headers\":[\"Via\"]}",
                    "pragma": "no-cache",
                    "report-to": "{\"group\":\"heroku-nel\",\"max_age\":3600,\"endpoints\":[{\"url\":\"https://nel.heroku.com/reports?ts=1711426039&sid=e11707d5-02a7-43ef-b45e-2cf4d2036f7d&s=WuH79u4cBxOZVc3ecpk4gs62nuRM2zxwcCK7ogIfMRU%3D\"}]}",
                    "reporting-endpoints": "heroku-nel=https://nel.heroku.com/reports?ts=1711426039&sid=e11707d5-02a7-43ef-b45e-2cf4d2036f7d&s=WuH79u4cBxOZVc3ecpk4gs62nuRM2zxwcCK7ogIfMRU%3D",
                    "server": "cloudflare",
                    "vary": "Origin, Accept-Encoding",
                    "via": "1.1 vegur",
                    "x-content-type-options": "nosniff",
                    "x-powered-by": "Express",
                    "x-ratelimit-limit": "1000",
                    "x-ratelimit-remaining": "999",
                    "x-ratelimit-reset": "1711426065"
                },
                "status": 200
            },
            "time.ms": 33
        }
    }
}

3. Environment variables

Environment variables are only available for use in self hosted mode.

Simply use a|env::<SOME_ENV_VAR>| anywhere in your configuration.

08 - Variable Substitutions

Note!​

Before​

After​

Steps​

1. Setting static global variables​

Deploy via Hosted / Managed​

Deploy via Self Hosted / Unmanaged​

Example Config 1​

Test​

Hosted mode, either navigate to or curl:​

Self hosted mode, either navigate to or curl:​

Response​

2. From action data​

Deploy via Hosted / Managed​

Deploy via Self Hosted / Unmanaged​

Example Config​

Test​

Hosted mode, curl or use your preferred API testing tool:​

Self hosted mode, curl or use your preferred API testing tool:​

Response​

3. Environment variables​

Note!

Before

After

Steps

1. Setting static global variables

Deploy via Hosted / Managed

Deploy via Self Hosted / Unmanaged

Example Config 1

Test

Hosted mode, either navigate to or curl:

Self hosted mode, either navigate to or curl:

Response

2. From action data

Deploy via Hosted / Managed

Deploy via Self Hosted / Unmanaged

Example Config

Test

Hosted mode, curl or use your preferred API testing tool:

Self hosted mode, curl or use your preferred API testing tool:

Response

3. Environment variables