how to read ansible yml config file in groovy - groovy

Question

I want to write a DSL job build script for jenkins in groovy which automatically make deploy job for our projects. There is a general yml file for ansible roles and hosts parameter in each project which I want to read it and use its contents to configure the job.
The problem is that so far I'm using the snakeyml for reading the yml file, but it returns an arraylist (more like a map) which I cannot use efficiently.
anyone knows a better solution?
my yml sample file:
---
- hosts: app.host
roles:
- role: app-db
db_name: myproje_db
db_port: "3306"
migrate_module: "my-proje-api"
- role: java-app
app_name: "myproje-api"
app_artifact_name: "my-proje-api"
app_links:
- myproje_db
I read the file from workspace in my main groovy script:
InputStream configFile = streamFileFromWorkspace('data/config.yml')
and process it in another function of another class:
public String configFileReader(def out, InputStream configFile){
def map
Yaml configFileYml = new Yaml()
map = configFileYml.load(configFile)
}
it returns map class type as arraylist.

Answer 1

It's an expected output, this configuration is starting with a "-" which represent a list. It's "a collection of hosts, and each host have a set of roles".
If you wants to iterate on each host, you can do :
Yaml configFileYml = new Yaml()
configFileYml.load(configFile).each { host -> ... }
When this configuration is read, it's equivalent to the following structure (in groovy format):
[ // collection of map (host)
[ // 1 map for each host
hosts:"app.host",
roles:[ // collection of map (role)
[ // 1 map for each role
role: 'app-db',
db_name: 'myproje_db',
db_port: "3306",
migrate_module: "my-proje-api"
],
[
role: 'java-app',
app_name: "myproje-api",
app_artifact_name: "my-proje-api",
app_links:['myproje_db']
]
]
]
]