open-consul/command/services/config.go

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package services
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import (
"reflect"
"time"
"github.com/hashicorp/consul/agent/config"
"github.com/hashicorp/consul/agent/structs"
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"github.com/hashicorp/consul/api"
"github.com/mitchellh/mapstructure"
)
// ServicesFromFiles returns the list of agent service registration structs
// from a set of file arguments.
func ServicesFromFiles(files []string) ([]*api.AgentServiceRegistration, error) {
// We set devMode to true so we can get the basic valid default
// configuration. devMode doesn't set any services by default so this
// is okay since we only look at services.
devMode := true
b, err := config.NewBuilder(config.Flags{
ConfigFiles: files,
DevMode: &devMode,
})
if err != nil {
return nil, err
}
cfg, err := b.BuildAndValidate()
if err != nil {
return nil, err
}
// The services are now in "structs.ServiceDefinition" form and we need
// them in "api.AgentServiceRegistration" form so do the conversion.
result := make([]*api.AgentServiceRegistration, 0, len(cfg.Services))
for _, svc := range cfg.Services {
apiSvc, err := serviceToAgentService(svc)
if err != nil {
return nil, err
}
result = append(result, apiSvc)
}
return result, nil
}
// serviceToAgentService converts a ServiceDefinition struct to an
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// AgentServiceRegistration API struct.
func serviceToAgentService(svc *structs.ServiceDefinition) (*api.AgentServiceRegistration, error) {
// mapstructure can do this for us, but we encapsulate it in this
// helper function in case we need to change the logic in the future.
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var result api.AgentServiceRegistration
d, err := mapstructure.NewDecoder(&mapstructure.DecoderConfig{
Result: &result,
DecodeHook: timeDurationToStringHookFunc(),
WeaklyTypedInput: true,
})
if err != nil {
return nil, err
}
if err := d.Decode(svc); err != nil {
return nil, err
}
// The structs version has non-pointer checks and the destination
// has pointers, so we need to set the destination to nil if there
// is no check ID set.
if result.Check != nil && result.Check.Name == "" {
result.Check = nil
}
if len(result.Checks) == 1 && result.Checks[0].Name == "" {
result.Checks = nil
}
return &result, nil
}
// timeDurationToStringHookFunc returns a DecodeHookFunc that converts
// time.Duration to string.
func timeDurationToStringHookFunc() mapstructure.DecodeHookFunc {
return func(
f reflect.Type,
t reflect.Type,
data interface{}) (interface{}, error) {
dur, ok := data.(time.Duration)
if !ok {
return data, nil
}
if t.Kind() != reflect.String {
return data, nil
}
if dur == 0 {
return "", nil
}
// Convert it by parsing
return data.(time.Duration).String(), nil
}
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}