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api_policy_mapper.go
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api_policy_mapper.go
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package api_v0_internal
import (
"fmt"
"policy-server/api"
"policy-server/store"
"code.cloudfoundry.org/cf-networking-helpers/marshal"
)
type policyMapper struct {
Unmarshaler marshal.Unmarshaler
Marshaler marshal.Marshaler
}
func NewMapper(Unmarshaler marshal.Unmarshaler, Marshaler marshal.Marshaler) api.PolicyMapper {
return &policyMapper{
Unmarshaler: Unmarshaler,
Marshaler: Marshaler,
}
}
func (p *policyMapper) AsStorePolicy(bytes []byte) ([]store.Policy, error) {
// this function should never be used
panic("as store policy was called for internal api")
}
func (p *policyMapper) AsBytes(storePolicies []store.Policy) ([]byte, error) {
// convert store.Policy to api_v0_internal.Policy
apiPolicies := []Policy{}
for _, policy := range storePolicies {
policyToAdd, canMap := mapStorePolicy(policy)
if canMap {
apiPolicies = append(apiPolicies, policyToAdd)
}
}
// convert api_v0_internal.Policy payload to bytes
payload := &Policies{
TotalPolicies: len(apiPolicies),
Policies: apiPolicies,
}
bytes, err := p.Marshaler.Marshal(payload)
if err != nil {
return nil, fmt.Errorf("marshal json: %s", err)
}
return bytes, nil
}
func mapStorePolicy(storePolicy store.Policy) (Policy, bool) {
if storePolicy.Destination.Ports.Start != storePolicy.Destination.Ports.End {
return Policy{}, false
}
return Policy{
Source: Source{
ID: storePolicy.Source.ID,
Tag: storePolicy.Source.Tag,
},
Destination: Destination{
ID: storePolicy.Destination.ID,
Tag: storePolicy.Destination.Tag,
Protocol: storePolicy.Destination.Protocol,
Port: storePolicy.Destination.Ports.Start,
Ports: Ports{
Start: storePolicy.Destination.Ports.Start,
End: storePolicy.Destination.Ports.End,
},
},
}, true
}