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providers.go
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providers.go
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package register
import (
"errors"
"fmt"
"github.com/go-spatial/tegola/dict"
"github.com/go-spatial/tegola/provider"
)
var (
ErrProviderNameMissing = errors.New("register: provider 'name' parameter missing")
ErrProviderNameInvalid = errors.New("register: provider 'name' value must be a string")
)
type ErrProviderAlreadyRegistered string
func (e ErrProviderAlreadyRegistered) Error() string {
return fmt.Sprintf("register: provider (%v) already registered", string(e))
}
type ErrProviderTypeMissing string
func (e ErrProviderTypeMissing) Error() string {
return fmt.Sprintf("register: provider 'type' parameter missing for provider (%v)", string(e))
}
type ErrProviderTypeInvalid string
func (e ErrProviderTypeInvalid) Error() string {
return fmt.Sprintf("register: provider 'type' must be a string for provider (%v)", string(e))
}
// Providers registers data provider backends
func Providers(providers []dict.Dicter) (map[string]provider.Tiler, error) {
// holder for registered providers
registeredProviders := map[string]provider.Tiler{}
// iterate providers
for _, p := range providers {
// lookup our proivder name
pname, err := p.String("name", nil)
if err != nil {
switch err.(type) {
case dict.ErrKeyRequired:
return registeredProviders, ErrProviderNameMissing
case dict.ErrKeyType:
return registeredProviders, ErrProviderNameInvalid
default:
return registeredProviders, err
}
}
// check if a proivder with this name is alrady registered
_, ok := registeredProviders[pname]
if ok {
return registeredProviders, ErrProviderAlreadyRegistered(pname)
}
// lookup our provider type
ptype, err := p.String("type", nil)
if err != nil {
switch err.(type) {
case dict.ErrKeyRequired:
return registeredProviders, ErrProviderTypeMissing(pname)
case dict.ErrKeyType:
return registeredProviders, ErrProviderTypeInvalid(pname)
default:
return registeredProviders, err
}
}
// register the provider
prov, err := provider.For(ptype, p)
if err != nil {
return registeredProviders, err
}
// add the provider to our map of registered providers
registeredProviders[pname] = prov
}
return registeredProviders, nil
}