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server.go
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server.go
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package server
import (
"bytes"
"context"
"encoding/base64"
"errors"
"fmt"
"net"
"net/http"
"os"
"path"
"strconv"
"github.com/fnproject/fn/api"
"github.com/fnproject/fn/api/agent"
"github.com/fnproject/fn/api/common"
"github.com/fnproject/fn/api/datastore"
"github.com/fnproject/fn/api/datastore/cache"
"github.com/fnproject/fn/api/id"
"github.com/fnproject/fn/api/logs"
"github.com/fnproject/fn/api/models"
"github.com/fnproject/fn/api/mqs"
"github.com/fnproject/fn/api/version"
"github.com/gin-gonic/gin"
"github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/ext"
"github.com/openzipkin/zipkin-go-opentracing"
"github.com/sirupsen/logrus"
"github.com/spf13/viper"
)
const (
EnvLogLevel = "log_level"
EnvMQURL = "mq_url"
EnvDBURL = "db_url"
EnvLOGDBURL = "logstore_url"
EnvPort = "port" // be careful, Gin expects this variable to be "port"
EnvAPIURL = "api_url"
EnvZipkinURL = "zipkin_url"
)
type Server struct {
Router *gin.Engine
Agent agent.Agent
Datastore models.Datastore
MQ models.MessageQueue
LogDB models.LogStore
appListeners []AppListener
middlewares []Middleware
runnerListeners []RunnerListener
}
// NewFromEnv creates a new Functions server based on env vars.
func NewFromEnv(ctx context.Context, opts ...ServerOption) *Server {
ds, err := datastore.New(viper.GetString(EnvDBURL))
if err != nil {
logrus.WithError(err).Fatalln("Error initializing datastore.")
}
mq, err := mqs.New(viper.GetString(EnvMQURL))
if err != nil {
logrus.WithError(err).Fatal("Error initializing message queue.")
}
var logDB models.LogStore = ds
if ldb := viper.GetString(EnvLOGDBURL); ldb != "" && ldb != viper.GetString(EnvDBURL) {
logDB, err = logs.New(viper.GetString(EnvLOGDBURL))
if err != nil {
logrus.WithError(err).Fatal("Error initializing logs store.")
}
}
return New(ctx, ds, mq, logDB, opts...)
}
// New creates a new Functions server with the passed in datastore, message queue and API URL
func New(ctx context.Context, ds models.Datastore, mq models.MessageQueue, logDB models.LogStore, opts ...ServerOption) *Server {
s := &Server{
Agent: agent.New(cache.Wrap(ds), mq), // only add datastore caching to agent
Router: gin.New(),
Datastore: ds,
MQ: mq,
LogDB: logDB,
}
setMachineId()
setTracer()
s.Router.Use(loggerWrap, traceWrap, panicWrap)
s.bindHandlers(ctx)
for _, opt := range opts {
if opt == nil {
continue
}
opt(s)
}
return s
}
// we should use http grr
func traceWrap(c *gin.Context) {
// try to grab a span from the request if made from another service, ignore err if not
wireContext, _ := opentracing.GlobalTracer().Extract(
opentracing.HTTPHeaders,
opentracing.HTTPHeadersCarrier(c.Request.Header))
// Create the span referring to the RPC client if available.
// If wireContext == nil, a root span will be created.
// TODO we should add more tags?
serverSpan := opentracing.StartSpan("serve_http", ext.RPCServerOption(wireContext), opentracing.Tag{Key: "path", Value: c.Request.URL.Path})
defer serverSpan.Finish()
ctx := opentracing.ContextWithSpan(c.Request.Context(), serverSpan)
c.Request = c.Request.WithContext(ctx)
c.Next()
}
func setTracer() {
var (
debugMode = false
serviceName = "fn-server"
serviceHostPort = "localhost:8080" // meh
zipkinHTTPEndpoint = viper.GetString(EnvZipkinURL)
// ex: "http://zipkin:9411/api/v1/spans"
)
if zipkinHTTPEndpoint == "" {
return
}
logger := zipkintracer.LoggerFunc(func(i ...interface{}) error { logrus.Error(i...); return nil })
collector, err := zipkintracer.NewHTTPCollector(zipkinHTTPEndpoint, zipkintracer.HTTPLogger(logger))
if err != nil {
logrus.WithError(err).Fatalln("couldn't start trace collector")
}
tracer, err := zipkintracer.NewTracer(zipkintracer.NewRecorder(collector, debugMode, serviceHostPort, serviceName),
zipkintracer.ClientServerSameSpan(true),
zipkintracer.TraceID128Bit(true),
)
if err != nil {
logrus.WithError(err).Fatalln("couldn't start tracer")
}
opentracing.SetGlobalTracer(tracer)
logrus.WithFields(logrus.Fields{"url": zipkinHTTPEndpoint}).Info("started tracer")
}
func setMachineId() {
port := uint16(viper.GetInt(EnvPort))
addr := whoAmI().To4()
if addr == nil {
addr = net.ParseIP("127.0.0.1").To4()
logrus.Warn("could not find non-local ipv4 address to use, using '127.0.0.1' for ids, if this is a cluster beware of duplicate ids!")
}
id.SetMachineIdHost(addr, port)
}
// whoAmI searches for a non-local address on any network interface, returning
// the first one it finds. it could be expanded to search eth0 or en0 only but
// to date this has been unnecessary.
func whoAmI() net.IP {
ints, _ := net.Interfaces()
for _, i := range ints {
if i.Name == "docker0" || i.Name == "lo" {
// not perfect
continue
}
addrs, _ := i.Addrs()
for _, a := range addrs {
ip, _, err := net.ParseCIDR(a.String())
if a.Network() == "ip+net" && err == nil && ip.To4() != nil {
if !bytes.Equal(ip, net.ParseIP("127.0.0.1")) {
return ip
}
}
}
}
return nil
}
func panicWrap(c *gin.Context) {
defer func(c *gin.Context) {
if rec := recover(); rec != nil {
err, ok := rec.(error)
if !ok {
err = fmt.Errorf("fn: %v", rec)
}
handleErrorResponse(c, err)
c.Abort()
}
}(c)
c.Next()
}
func loggerWrap(c *gin.Context) {
ctx, _ := common.LoggerWithFields(c.Request.Context(), extractFields(c))
if appName := c.Param(api.CApp); appName != "" {
c.Set(api.AppName, appName)
c.Request = c.Request.WithContext(context.WithValue(c.Request.Context(), api.AppName, appName))
}
if routePath := c.Param(api.CRoute); routePath != "" {
c.Set(api.Path, routePath)
c.Request = c.Request.WithContext(context.WithValue(c.Request.Context(), api.Path, routePath))
}
c.Request = c.Request.WithContext(ctx)
c.Next()
}
func appWrap(c *gin.Context) {
appName := c.GetString(api.AppName)
if appName == "" {
handleErrorResponse(c, models.ErrAppsMissingName)
c.Abort()
return
}
c.Next()
}
func (s *Server) handleRunnerRequest(c *gin.Context) {
s.handleRequest(c)
}
func extractFields(c *gin.Context) logrus.Fields {
fields := logrus.Fields{"action": path.Base(c.HandlerName())}
for _, param := range c.Params {
fields[param.Key] = param.Value
}
return fields
}
func (s *Server) Start(ctx context.Context) {
ctx = contextWithSignal(ctx, os.Interrupt)
s.startGears(ctx)
}
func (s *Server) startGears(ctx context.Context) {
// By default it serves on :8080 unless a
// PORT environment variable was defined.
listen := fmt.Sprintf(":%d", viper.GetInt(EnvPort))
const runHeader = `
______
/ ____/___
/ /_ / __ \
/ __/ / / / /
/_/ /_/ /_/`
fmt.Println(runHeader)
fmt.Printf(" v%s\n\n", version.Version)
logrus.Infof("Serving Functions API on address `%s`", listen)
server := http.Server{
Addr: listen,
Handler: s.Router,
// TODO we should set read/write timeouts
}
go func() {
<-ctx.Done() // listening for signals...
server.Shutdown(context.Background()) // we can wait
}()
err := server.ListenAndServe()
if err != nil {
logrus.WithError(err).Error("error opening server")
}
s.Agent.Close() // after we stop taking requests, wait for all tasks to finish
}
func (s *Server) bindHandlers(ctx context.Context) {
engine := s.Router
engine.GET("/", handlePing)
engine.GET("/version", handleVersion)
engine.GET("/stats", s.handleStats)
{
v1 := engine.Group("/v1")
v1.Use(s.middlewareWrapperFunc(ctx))
v1.GET("/apps", s.handleAppList)
v1.POST("/apps", s.handleAppCreate)
{
apps := v1.Group("/apps/:app")
apps.Use(appWrap)
apps.GET("", s.handleAppGet)
apps.PATCH("", s.handleAppUpdate)
apps.DELETE("", s.handleAppDelete)
apps.GET("/routes", s.handleRouteList)
apps.POST("/routes", s.handleRoutesPostPutPatch)
apps.GET("/routes/*route", s.handleRouteGet)
apps.PATCH("/routes/*route", s.handleRoutesPostPutPatch)
apps.PUT("/routes/*route", s.handleRoutesPostPutPatch)
apps.DELETE("/routes/*route", s.handleRouteDelete)
apps.GET("/calls", s.handleCallList)
apps.GET("/calls/:call", s.handleCallGet)
apps.GET("/calls/:call/log", s.handleCallLogGet)
apps.DELETE("/calls/:call/log", s.handleCallLogDelete)
}
}
{
runner := engine.Group("/r")
runner.Use(appWrap)
runner.Any("/:app", s.handleRunnerRequest)
runner.Any("/:app/*route", s.handleRunnerRequest)
}
engine.NoRoute(func(c *gin.Context) {
logrus.Debugln("not found", c.Request.URL.Path)
c.JSON(http.StatusNotFound, simpleError(errors.New("Path not found")))
})
}
// returns the unescaped ?cursor and ?perPage values
// pageParams clamps 0 < ?perPage <= 100 and defaults to 30 if 0
// ignores parsing errors and falls back to defaults.
func pageParams(c *gin.Context, base64d bool) (cursor string, perPage int) {
cursor = c.Query("cursor")
if base64d {
cbytes, _ := base64.RawURLEncoding.DecodeString(cursor)
cursor = string(cbytes)
}
perPage, _ = strconv.Atoi(c.Query("per_page"))
if perPage > 100 {
perPage = 100
} else if perPage <= 0 {
perPage = 30
}
return cursor, perPage
}
type appResponse struct {
Message string `json:"message"`
App *models.App `json:"app"`
}
type appsResponse struct {
Message string `json:"message"`
NextCursor string `json:"next_cursor"`
Apps []*models.App `json:"apps"`
}
type routeResponse struct {
Message string `json:"message"`
Route *models.Route `json:"route"`
}
type routesResponse struct {
Message string `json:"message"`
NextCursor string `json:"next_cursor"`
Routes []*models.Route `json:"routes"`
}
type callResponse struct {
Message string `json:"message"`
Call *models.Call `json:"call"`
}
type callsResponse struct {
Message string `json:"message"`
NextCursor string `json:"next_cursor"`
Calls []*models.Call `json:"calls"`
}
type callLogResponse struct {
Message string `json:"message"`
Log *models.CallLog `json:"log"`
}