CODEWITHSUNDEEP
parsinggoyaml
cybertextron
cybertextron

Reputation: 10961

Parsing a yaml file with Golang

I'm trying to parse a yaml file with Golang. I defined the following types:

type DockerNetwork struct {
   MyNetwork struct {
      driver string
   } `yaml:"my_network"`
}

// DockerNetworks represent the docker Networks type
type DockerNetworks struct {
    networks []DockerNetwork
}

so I have my unit test in place:

func TestDockerNetwork(t *testing.T) {
    dn := DockerNetworks{}
    var data = `
networks:
   my_network:
     driver: bridge
    `
    err := yaml.Unmarshal([]byte(data), &dn)
    if err != nil {
        log.Fatalf("error: %v", err)
        t.Error("Could not Unmarshal the data")
    }
    log.Println(fmt.Sprintf("--- t:\n%v\n\n", dn))
}

I expected it to work, however I'm getting no input:

2016/12/14 13:38:12 --- t:
{{}}

what am I doing wrong?

Upvotes: 3

Views: 5021

Answers (2)

cybertextron
cybertextron

Reputation: 10961

My yaml file is a docker-compose.yml file, which is in the format described above (part of it). I agree with Marius that I have unexported fields, which is an error. The solution I used was map:

m := make(map[interface{}]interface{})

err = yaml.Unmarshal([]byte(data), &m)
if err != nil {
   log.Fatalf("error: %v", err)
}
fmt.Printf("--- m:\n%v\n\n", m)

Upvotes: 2

mkr
mkr

Reputation: 195

AFAIKT there to things, data structures with unexported fields and test data which doesn't match your data structures.

Something like this would give you a go:

type DockerNetwork struct {
    MyNetwork struct {
        Driver string `yaml:driver`
    } `yaml:"my_network"`
}

type DockerNetworks struct {
    Networks []DockerNetwork `yaml:networks`
}

And test data:

networks:
-  my_network:
    driver: bridge

Gives an output:

2016/12/14 23:47:23 --- t:
{[{{bridge}}]}


PASS

And It's hard to tell, what is "working" in your opinion.

Upvotes: 0

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