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server.go
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server.go
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package grpcp
import (
"bytes"
"errors"
"fmt"
"html/template"
"io"
"io/ioutil"
"net/http"
"github.com/ambientkit/ambient"
"github.com/ambientkit/ambient/pkg/avfs"
"github.com/ambientkit/ambient/pkg/grpcp/grpcsafe"
"github.com/ambientkit/ambient/pkg/grpcp/protodef"
"github.com/ambientkit/ambient/pkg/requestuuid"
plugin "github.com/hashicorp/go-plugin"
"golang.org/x/net/context"
"google.golang.org/grpc"
)
// GRPCServer is the server side implementation.
type GRPCServer struct {
broker *plugin.GRPCBroker
client protodef.GenericPluginClient
toolkit *ambient.Toolkit
conn *grpc.ClientConn
server *grpc.Server
serverState *grpcsafe.ServerState
funcMapperClient *GRPCFuncMapperServer
}
// PluginName handler.
func (m *GRPCServer) PluginName() string {
resp, err := m.client.PluginName(context.Background(), &protodef.Empty{})
if err != nil {
return ""
}
return resp.Name
}
// PluginVersion handler.
func (m *GRPCServer) PluginVersion() string {
resp, err := m.client.PluginVersion(context.Background(), &protodef.Empty{})
if err != nil {
return ""
}
return resp.Version
}
// Enable handler.
func (m *GRPCServer) Enable(toolkit *ambient.Toolkit) error {
//toolkit.Log.Debug("enabled called")
m.toolkit = toolkit
loggerServer := &GRPCLoggerServer{
Impl: toolkit.Log,
}
routerServer := &GRPCAddRouterServer{
Impl: toolkit.Mux,
Log: toolkit.Log,
broker: m.broker,
reqmap: m.serverState,
}
siteServer := &GRPCSiteServer{
Impl: toolkit.Site,
Log: toolkit.Log,
reqmap: m.serverState,
}
rendererServer := &GRPCRendererServer{
Log: toolkit.Log,
Impl: toolkit.Render,
reqmap: m.serverState,
}
funcMapperServer := &GRPCFuncMapperPlugin{
Impl: &FuncMapperImpl{
Log: m.toolkit.Log,
},
Log: m.toolkit.Log,
}
serverFunc := func(opts []grpc.ServerOption) *grpc.Server {
m.server = grpc.NewServer(opts...)
protodef.RegisterLoggerServer(m.server, loggerServer)
protodef.RegisterRouterServer(m.server, routerServer)
protodef.RegisterSiteServer(m.server, siteServer)
protodef.RegisterRendererServer(m.server, rendererServer)
protodef.RegisterFuncMapperServer(m.server, funcMapperServer)
return m.server
}
brokerID := m.broker.NextId()
go m.broker.AcceptAndServe(brokerID, serverFunc)
resp, err := m.client.Enable(context.Background(), &protodef.Toolkit{
Uid: brokerID,
})
if err != nil {
return err
}
m.conn, err = m.broker.Dial(resp.Uid)
if err != nil {
return err
}
routerServer.HandlerClient = &GRPCHandlerServer{
client: protodef.NewHandlerClient(m.conn),
}
rendererServer.FuncMapperClient = &GRPCFuncMapperServer{
client: protodef.NewFuncMapperClient(m.conn),
Log: toolkit.Log,
}
m.funcMapperClient = rendererServer.FuncMapperClient
return nil
}
// Disable handler.
func (m *GRPCServer) Disable() error {
if m.server != nil {
_, _ = m.client.Disable(context.Background(), &protodef.Empty{})
m.server.Stop()
m.server = nil
}
return nil
}
// Routes handler.
func (m *GRPCServer) Routes() {
if m.server == nil || m.toolkit == nil || m.toolkit.Log == nil {
return
}
_, err := m.client.Routes(context.Background(), &protodef.Empty{})
if err != nil {
m.toolkit.Log.Error("error calling routes: %v", err)
}
}
// Assets handler.
func (m *GRPCServer) Assets() ([]ambient.Asset, ambient.FileSystemReader) {
resp, err := m.client.Assets(context.Background(), &protodef.Empty{})
if err != nil {
m.toolkit.Log.Error("error calling Assets: %v", err)
return nil, nil
}
var assets []ambient.Asset
err = ProtobufStructToArray(resp.Assets, &assets)
if err != nil {
m.toolkit.Log.Error("error calling Assets conversion: %v", err)
}
// Build a file system.
efs := avfs.NewFS()
for _, v := range resp.Files {
efs.AddFile(v.Name, v.Body)
}
return assets, efs
}
// Settings handler.
func (m *GRPCServer) Settings() []ambient.Setting {
resp, err := m.client.Settings(context.Background(), &protodef.Empty{})
if err != nil {
m.toolkit.Log.Error("error calling Settings: %v", err)
return nil
}
arr := make([]ambient.Setting, 0)
for _, v := range resp.Settings {
var i interface{}
err = ProtobufAnyToInterface(v.Default, &i)
if err != nil {
m.toolkit.Log.Error("error calling Settings: %v", err)
}
arr = append(arr, ambient.Setting{
Name: v.Name,
Type: ambient.SettingType(v.Settingtype),
Description: ambient.SettingDescription{
Text: v.Description.Text,
URL: v.Description.Url,
},
Hide: v.Hide,
Default: i,
})
}
if err != nil {
m.toolkit.Log.Error("error calling Settings conversion: %v", err)
}
return arr
}
// GrantRequests handler.
func (m *GRPCServer) GrantRequests() []ambient.GrantRequest {
resp, err := m.client.GrantRequests(context.Background(), &protodef.Empty{})
if err != nil {
m.toolkit.Log.Error("error calling GrantRequests: %v", err)
return nil
}
arr := make([]ambient.GrantRequest, 0)
for _, v := range resp.Grantrequest {
arr = append(arr, ambient.GrantRequest{
Grant: ambient.Grant(v.Grant),
Description: v.Description,
})
}
return arr
}
// FuncMap handler.
func (m *GRPCServer) FuncMap() func(r *http.Request) template.FuncMap {
// Return a list of keys for the FuncMap().
resp, err := m.client.FuncMap(context.Background(), &protodef.Empty{})
if err != nil {
m.toolkit.Log.Error("error calling FuncMap: %v", err)
return nil
}
if len(resp.Keys) == 0 {
return nil
}
return func(req *http.Request) template.FuncMap {
fm := make(template.FuncMap)
for _, rawV := range resp.Keys {
// Prevent race conditions.
v := rawV
fm[v] = func(args ...interface{}) (interface{}, error) {
val, errText, err := m.funcMapperClient.Do(req, requestuuid.Get(req), v, args, true)
if err != nil {
m.toolkit.Log.Error("error executing FuncMap: %v", err)
}
if len(errText) > 0 {
return val, errors.New(errText)
}
return val, nil
}
}
return fm
}
}
// Middleware handler.
func (m *GRPCServer) Middleware() []func(next http.Handler) http.Handler {
return []func(next http.Handler) http.Handler{
func(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
sm, err := ObjectToProtobufStruct(r.Header)
if err != nil {
m.toolkit.Log.Error("error getting Middleware header: %v", err)
}
body := bytes.NewBuffer(nil)
_, err = io.Copy(body, r.Body)
if err != nil {
m.toolkit.Log.Error("error getting Middleware body: %v", err)
}
// Restore body.
r.Body = ioutil.NopCloser(body)
//m.toolkit.Log.Error("body in: %v | %v | %v", r.RequestURI, len(body.Bytes()), body.String())
uuid := requestuuid.Get(r)
m.serverState.Save(uuid, &grpcsafe.HTTPContainer{
Request: r,
Response: w,
FuncMap: make(template.FuncMap),
})
defer m.serverState.Delete(uuid)
resp, err := m.client.Middleware(context.Background(), &protodef.MiddlewareRequest{
Requestid: uuid,
Method: r.Method,
Path: r.RequestURI,
Headers: sm,
Body: body.Bytes(),
})
if err != nil {
m.toolkit.Log.Error("error calling Middleware: %v", err)
return
}
if resp.Status != 0 {
var outHeader http.Header
err = ProtobufStructToObject(resp.Headers, &outHeader)
if err != nil {
m.toolkit.Log.Error("error converting Middleware headers: %v", err)
}
// Copy over the headers.
for k, v := range outHeader {
w.Header()[k] = v
}
//m.toolkit.Log.Error("body ou: %v | %v", len(resp.Response), string(resp.Response))
// If the response has text, then display it.
if len(resp.Response) > 0 {
w.WriteHeader(int(resp.Status))
fmt.Fprint(w, resp.Response)
return
}
// If the status came back as something other than 200, then display it.
if resp.Status != http.StatusOK {
w.WriteHeader(int(resp.Status))
if len(resp.Error) > 0 {
fmt.Fprint(w, resp.Error)
}
return
}
}
h.ServeHTTP(w, r)
})
},
}
}