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builder.go
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builder.go
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package protoanalysis
import (
"fmt"
"regexp"
"strings"
"github.com/emicklei/proto"
)
type builder struct {
p protoPackage
}
// build turns a low level proto pkg into a high level Package.
func build(p protoPackage) Package {
br := builder{p}
pk := Package{
Name: p.name,
Path: p.dir,
Files: br.buildFiles(),
Messages: br.buildMessages(),
Services: br.toServices(p.services()),
}
for _, option := range p.options() {
if option.Name == optionGoPkg {
pk.GoImportName = option.Constant.Source
break
}
}
return pk
}
func (b builder) buildFiles() (files []File) {
for _, f := range b.p.files {
files = append(files, File{f.path, f.imports})
}
return
}
func (b builder) buildMessages() (messages []Message) {
for _, f := range b.p.files {
for _, message := range f.messages {
// Keep track of the message fields and types
fields := make(map[string]string)
// Find the highest field number
var highestFieldNumber int
for _, elem := range message.Elements {
field, ok := elem.(*proto.NormalField)
if !ok {
continue
}
if field.Sequence > highestFieldNumber {
highestFieldNumber = field.Sequence
}
fields[field.Name] = field.Type
}
// some proto messages might be defined inside another proto messages.
// to represents these types, an underscore is used.
// e.g. if C message inside B, and B inside A: A_B_C.
var (
name = message.Name
parent = message.Parent
)
for {
if parent == nil {
break
}
parentMessage, ok := parent.(*proto.Message)
if !ok {
break
}
name = fmt.Sprintf("%s_%s", parentMessage.Name, name)
parent = parentMessage.Parent
}
messages = append(messages, Message{
Name: name,
Path: f.path,
HighestFieldNumber: highestFieldNumber,
Fields: fields,
})
}
}
return messages
}
func (b builder) toServices(ps []*proto.Service) (services []Service) {
for _, service := range ps {
s := Service{
Name: service.Name,
RPCFuncs: b.elementsToRPCFunc(service.Elements),
}
services = append(services, s)
}
return
}
func (b builder) elementsToRPCFunc(elems []proto.Visitee) (rpcFuncs []RPCFunc) {
for _, el := range elems {
rpc, ok := el.(*proto.RPC)
if !ok {
continue
}
var requestMessage *proto.Message
for _, message := range b.p.messages() {
if message.Name != rpc.RequestType {
continue
}
requestMessage = message
}
if requestMessage == nil {
continue
}
rf := RPCFunc{
Name: rpc.Name,
RequestType: rpc.RequestType,
ReturnsType: rpc.ReturnsType,
HTTPRules: b.elementsToHTTPRules(requestMessage, rpc.Elements),
}
rpcFuncs = append(rpcFuncs, rf)
}
return rpcFuncs
}
func (b builder) elementsToHTTPRules(requestMessage *proto.Message, elems []proto.Visitee) (httpRules []HTTPRule) {
for _, el := range elems {
option, ok := el.(*proto.Option)
if !ok {
continue
}
if !strings.Contains(option.Name, "google.api.http") {
continue
}
httpRules = append(httpRules, b.constantToHTTPRules(requestMessage, option.Constant)...)
}
return
}
// Regexp to extract HTTP rule URL parameter names.
// The expression extracts parameter names defined within "{}".
// Extra parameter arguments are ignored. These arguments are normally
// defined after an "=", for example as "{param=**}".
var urlParamRe = regexp.MustCompile(`(?m){([^=]+?)(?:=.+?)?}`)
func (b builder) constantToHTTPRules(requestMessage *proto.Message, constant proto.Literal) (httpRules []HTTPRule) {
// find out the endpoint template.
endpoint := constant.Source
if endpoint == "" {
for key, val := range constant.Map {
switch key {
case
"get",
"post",
"put",
"patch",
"delete":
endpoint = val.Source
}
if endpoint != "" {
break
}
}
}
// find out url params.
var params []string
match := urlParamRe.FindAllStringSubmatch(endpoint, -1)
for _, item := range match {
params = append(params, item[1])
}
// calculate url params, query params and body fields counts.
var (
messageFieldsCount = b.messageFieldsCount(requestMessage)
paramsCount = len(params)
bodyFieldsCount int
)
if body, ok := constant.Map["body"]; ok { // check if body is specified.
if body.Source == "*" { // means there should be no query params per the spec.
bodyFieldsCount = messageFieldsCount - paramsCount
} else if body.Source != "" {
bodyFieldsCount = 1 // means body fields are grouped under a single top-level field.
}
}
queryParamsCount := messageFieldsCount - paramsCount - bodyFieldsCount
// create and add the HTTP rule to the list.
httpRule := HTTPRule{
Params: params,
HasQuery: queryParamsCount > 0,
HasBody: bodyFieldsCount > 0,
}
httpRules = append(httpRules, httpRule)
// search for nested HTTP rules.
if constant, ok := constant.Map["additional_bindings"]; ok {
httpRules = append(httpRules, b.constantToHTTPRules(requestMessage, *constant)...)
}
return httpRules
}
func (b builder) messageFieldsCount(message *proto.Message) (count int) {
for _, el := range message.Elements {
switch el.(type) {
case
*proto.NormalField,
*proto.MapField,
*proto.OneOfField:
count++
}
}
return
}