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eskiptojson.go
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/
eskiptojson.go
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package innkeeper
import (
"github.com/zalando/skipper/eskip"
"log"
)
type matchType string
const (
matchStrict = matchType("STRICT")
matchRegex = matchType("REGEX")
)
type (
pathMatcher struct {
Typ matchType `json:"type,omitempty"`
Match string `json:"match,omitempty"`
}
headerMatcher struct {
Typ matchType `json:"type,omitempty"`
Name string `json:"name,omitempty"`
Value string `json:"value,omitempty"`
}
customPredicate struct {
Name string `json:"name,omitempty"`
Args []interface{} `json:"args"`
}
filter struct {
Name string `json:"name,omitempty"`
Args []interface{} `json:"args"`
}
matcher struct {
HostMatcher string `json:"host_matcher,omitempty"`
PathMatcher *pathMatcher `json:"path_matcher,omitempty"`
MethodMatcher string `json:"method_matcher,omitempty"`
HeaderMatchers []headerMatcher `json:"header_matchers"`
}
routeDef struct {
Matcher matcher `json:"matcher,omitempty"`
Predicates []customPredicate `json:"predicates"`
Filters []filter `json:"filters"`
Endpoint string `json:"endpoint,omitempty"`
}
jsonRoute struct {
Id int64 `json:"id,omitempty"`
Name string `json:"name,omitempty"`
ActivateAt string `json:"activate_at,omitempty"`
CreatedAt string `json:"created_at,omitempty"`
DeletedAt string `json:"deleted_at,omitempty"`
Route routeDef `json:"route"`
}
)
func convertPathMatcher(r *eskip.Route) *pathMatcher {
var (
pathMatch string
pathMatchType matchType
)
if r.Path != "" {
pathMatch = r.Path
pathMatchType = matchStrict
} else if len(r.PathRegexps) > 0 {
// TODO we should only have one path regexp
if len(r.PathRegexps) > 1 {
log.Println("Warn: We should only have one path regexp")
}
pathMatch = r.PathRegexps[0]
pathMatchType = matchRegex
} else {
return nil
}
return &pathMatcher{
Match: pathMatch,
Typ: pathMatchType}
}
func convertMethod(r *eskip.Route) string {
return r.Method
}
func convertHost(r *eskip.Route) (host string) {
if len(r.HostRegexps) > 0 {
// we take the first one
// TODO HostRegexps should not be an array
if len(r.HostRegexps) > 1 {
log.Println("Warn: We should only have one host regexp")
}
host = r.HostRegexps[0]
}
return
}
func appendHeader(headers *map[string]string, hm []headerMatcher, ty matchType) (headerMatchers []headerMatcher) {
headerMatchers = hm
for k, v := range *headers {
headerMatchers = append(headerMatchers, headerMatcher{
Name: k,
Value: v,
Typ: ty})
}
return
}
func convertHeaderMatchers(r *eskip.Route) (headerMatchers []headerMatcher) {
headerMatchers = []headerMatcher{}
headerMatchers = appendHeader(&r.Headers, headerMatchers, matchStrict)
// TODO there should only be one map of header regexp
//headerMatchers = appendHeader(&r.HeaderRegexps[0], headerMatchers, matchRegexp)
for k, l := range r.HeaderRegexps {
for _, v := range l {
headerMatchers = append(headerMatchers, headerMatcher{
Name: k,
Value: v,
Typ: matchRegex})
}
}
return
}
func convertEskipPredicates(r *eskip.Route) []customPredicate {
var ps []customPredicate
for _, p := range r.Predicates {
ps = append(ps, customPredicate{
Name: p.Name,
Args: p.Args})
}
return ps
}
func convertFil(r *eskip.Route) (filters []filter) {
filters = []filter{}
for _, f := range r.Filters {
var args = []interface{}{}
if f.Args != nil {
args = f.Args
}
filters = append(filters, filter{
Name: f.Name,
Args: args})
}
return
}
func convertEndpoint(r *eskip.Route) string {
if r.Shunt || r.BackendType == eskip.ShuntBackend || r.BackendType == eskip.LoopBackend {
return ""
}
return r.Backend
}
func convertEskipToInnkeeper(routes []*eskip.Route) (data []*jsonRoute) {
for _, r := range routes {
id := eskip.GenerateIfNeeded(r.Id)
host := convertHost(r)
method := convertMethod(r)
pathMatch := convertPathMatcher(r)
headerMatchers := convertHeaderMatchers(r)
predicates := convertEskipPredicates(r)
filters := convertFil(r)
endpoint := convertEndpoint(r)
match := &matcher{
HostMatcher: host,
PathMatcher: pathMatch,
MethodMatcher: method,
HeaderMatchers: headerMatchers}
ro := &routeDef{
Matcher: *match,
Predicates: predicates,
Filters: filters,
Endpoint: endpoint}
d := &jsonRoute{
Name: id,
Route: *ro}
data = append(data, d)
}
return
}