this is my yaml file:
db:
# table prefix
tablePrefix: tbl
# mysql driver configuration
mysql:
host: localhost
username: root
password: mysql
# couchbase driver configuration
couchbase:
host: couchbase://localhost
and i use go-yaml library to unmarshall yaml file to variable:
config := make(map[interface{}]interface{})
yaml.Unmarshal(configFile, &config)
config value:
map[mysql:map[host:localhost username:root password:mysql] couchbase:map[host:couchbase://localhost] tablePrefix:tbl]
how access to db -> mysql -> username value in config without predefined struct type
YAML uses string keys. Have you tried:
config := make(map[string]interface{})
To access nested attributes, use type assertions.
mysql := config["mysql"].(map[string][string])
mysql["host"]
A common pattern is to alias a generic map type.
type M map[string]interface{}
config := make(M)
yaml.Unmarshal(configFile, &config)
mysql := config["mysql"].(M)
host := mysql["host"].(string)
If you don't define the types ahead of time, you need to assert the proper type from each interface{} you encounter:
if db, ok := config["db"].(map[interface{}]interface{}); ok {
if mysql, ok := db["mysql"].(map[interface{}]interface{}); ok {
username := mysql["username"].(string)
// ...
}
}