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package http
import (
"context"
"fmt"
"io/ioutil"
"net/http"
"reflect"
"strings"
"sync"
"github.com/unistack-org/micro/v3/client"
"github.com/unistack-org/micro/v3/codec"
"github.com/unistack-org/micro/v3/errors"
rutil "github.com/unistack-org/micro/v3/util/reflect"
util "github.com/unistack-org/micro/v3/util/router"
)
var (
templateCache = make(map[string]util.Template)
mu sync.RWMutex
)
func newPathRequest(path string, method string, body string, msg interface{}, tags []string) (string, interface{}, error) {
// parse via https://github.com/googleapis/googleapis/blob/master/google/api/http.proto definition
tpl, err := newTemplate(path)
if err != nil {
return "", nil, err
}
if len(tpl.Fields) > 0 && msg == nil {
return "", nil, fmt.Errorf("nil message but path params requested: %v", path)
}
fieldsmap := make(map[string]string, len(tpl.Fields))
for _, v := range tpl.Fields {
fieldsmap[v] = ""
}
nmsg, err := rutil.Zero(msg)
if err != nil {
return "", nil, err
}
// we cant switch on message and use proto helpers, to avoid dependency to protobuf
tmsg := reflect.ValueOf(msg)
if tmsg.Kind() == reflect.Ptr {
tmsg = tmsg.Elem()
}
tnmsg := reflect.ValueOf(nmsg)
if tnmsg.Kind() == reflect.Ptr {
tnmsg = tnmsg.Elem()
}
values := make(map[string]string)
// copy cycle
for i := 0; i < tmsg.NumField(); i++ {
val := tmsg.Field(i)
if val.IsZero() {
continue
}
fld := tmsg.Type().Field(i)
t := &tag{}
for _, tn := range tags {
ts, ok := fld.Tag.Lookup(tn)
if !ok {
continue
}
tp := strings.Split(ts, ",")
// special
switch tn {
case "protobuf": // special
t = &tag{key: tn, name: tp[3][5:], opts: append(tp[:3], tp[4:]...)}
default:
t = &tag{key: tn, name: tp[0], opts: tp[1:]}
}
if t.name != "" {
break
}
}
if t.name == "" {
// fallback to lowercase
t.name = strings.ToLower(fld.Name)
}
if _, ok := fieldsmap[t.name]; ok {
fieldsmap[t.name] = fmt.Sprintf("%v", val.Interface())
} else if (body == "*" || body == t.name) && method != http.MethodGet {
tnmsg.Field(i).Set(val)
} else {
values[t.name] = fmt.Sprintf("%v", val.Interface())
}
}
// check not filled stuff
for k, v := range fieldsmap {
if v == "" {
return "", nil, fmt.Errorf("path param %s not filled", k)
}
}
var b strings.Builder
for _, fld := range tpl.Pool {
_, _ = b.WriteRune('/')
if v, ok := fieldsmap[fld]; ok {
_, _ = b.WriteString(v)
} else {
_, _ = b.WriteString(fld)
}
}
idx := 0
for k, v := range values {
if idx == 0 {
_, _ = b.WriteRune('?')
} else {
_, _ = b.WriteRune('&')
}
_, _ = b.WriteString(k)
_, _ = b.WriteRune('=')
_, _ = b.WriteString(v)
idx++
}
if rutil.IsZero(nmsg) {
return b.String(), nil, nil
}
return b.String(), nmsg, nil
}
func newTemplate(path string) (util.Template, error) {
mu.RLock()
tpl, ok := templateCache[path]
if ok {
mu.RUnlock()
return tpl, nil
}
mu.RUnlock()
rule, err := util.Parse(path)
if err != nil {
return tpl, err
}
tpl = rule.Compile()
mu.Lock()
templateCache[path] = tpl
mu.Unlock()
return tpl, nil
}
func parseRsp(ctx context.Context, hrsp *http.Response, cf codec.Codec, rsp interface{}, opts client.CallOptions) error {
b, err := ioutil.ReadAll(hrsp.Body)
if err != nil {
return errors.InternalServerError("go.micro.client", err.Error())
}
if hrsp.StatusCode < 400 {
// unmarshal
if err := cf.Unmarshal(b, rsp); err != nil {
return errors.InternalServerError("go.micro.client", err.Error())
}
return nil
}
errmap, ok := opts.Context.Value(errorMapKey{}).(map[string]interface{})
if !ok || errmap == nil {
// user not provide map of errors
// id: req.Service() ??
return errors.New("go.micro.client", string(b), int32(hrsp.StatusCode))
}
if err, ok = errmap[fmt.Sprintf("%d", hrsp.StatusCode)].(error); !ok {
err, ok = errmap["default"].(error)
}
if !ok {
return errors.New("go.micro.client", string(b), int32(hrsp.StatusCode))
}
if cerr := cf.Unmarshal(b, err); cerr != nil {
return errors.InternalServerError("go.micro.client", cerr.Error())
}
return err
}
type tag struct {
key string
name string
opts []string
}