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Switch to dep from glide (#664)

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Travis Reeder
2018-01-09 14:11:08 -08:00
committed by Reed Allman
parent 0a09d74137
commit 3b9818bc58
1074 changed files with 10019 additions and 107660 deletions
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3
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# Please refer to main contribution doc:
https://github.com/fnproject/fn/blob/master/CONTRIBUTING.md

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http://www.apache.org/licenses/
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# Go Fn Development Kit (FDK)
[![GoDoc](https://godoc.org/github.com/fnproject/fdk-go?status.svg)](https://godoc.org/github.com/fnproject/fdk-go)
fdk-go provides convenience functions for writing Go fn code
For getting started with fn, please refer to https://github.com/fnproject/fn/blob/master/README.md
# Installing fdk-go
```sh
go get github.com/fnproject/fdk-go
```
or your favorite vendoring solution :)
# Examples
For a simple getting started, see the [examples](/examples/hello) and follow
the [README](/examples/hello/README.md). If you already have `fn` set up it
will take 2 minutes!
# Advanced example
TODO going to move to [examples](examples/) too :)
```go
package main
import (
"context"
"fmt"
"io"
"encoding/json"
fdk "github.com/fnproject/fdk-go"
"net/http"
)
func main() {
fdk.Handle(fdk.HandlerFunc(myHandler))
}
func myHandler(ctx context.Context, in io.Reader, out io.Writer) {
fnctx := fdk.Context(ctx)
contentType := fnctx.Header.Get("Content-Type")
if contentType != "application/json" {
fdk.WriteStatus(out, 400)
fdk.SetHeader(out, "Content-Type", "application/json")
io.WriteString(out, `{"error":"invalid content type"}`)
return
}
if fnctx.Config["FN_METHOD"] != "PUT" {
fdk.WriteStatus(out, 404)
fdk.SetHeader(out, "Content-Type", "application/json")
io.WriteString(out, `{"error":"route not found"}`)
return
}
var person struct {
Name string `json:"name"`
}
json.NewDecoder(in).Decode(&person)
// you can write your own headers & status, if you'd like to
fdk.WriteStatus(out, 201)
fdk.SetHeader(out, "Content-Type", "application/json")
all := struct {
Name string `json:"name"`
Header http.Header `json:"header"`
Config map[string]string `json:"config"`
}{
Name: person.Name,
Header: fnctx.Header,
Config: fnctx.Config,
}
json.NewEncoder(out).Encode(&all)
}
```

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# Function Examples
The goal of the `fdk`'s are to make it just as easy to write a hot function as
it is a cold one. The best way to showcase this is with an example.
This is an example of a hot function using the fdk-go bindings. The [hot function
documentation](https://github.com/fnproject/fn/blob/master/docs/hot-functions.md)
contains an analysis of how this example works under the hood. With any of the
examples provided here, you may use any format to configure your functions in
`fn` itself. Here we add instructions to set up functions with a 'hot' format.
### How to run the example
Install the CLI tool, start a Fn server and run `docker login` to login to
DockerHub. See the [front page](https://github.com/fnproject/fn) for
instructions.
Initialize the example with an image name you can access:
```sh
fn init --runtime docker --format http --name <DOCKERHUB_USER/image_name>
```
`--format json` will also work here, or if your functions already use json
then adding the fdk will be seamless.
Build and deploy the function to the Fn server (default localhost:8080)
```sh
fn deploy --app hot-app
```
Now call your function (may take a sec to pull image):
```sh
curl -X POST -d '{"name":"Clarice"}' http://localhost:8080/r/hot-app/hello
```
**Note** that this expects you were in a directory named 'hello' (where this
example lives), if this doesn't work, replace 'hello' with your `$PWD` from
the `deploy` command.
Then call it again to see how fast hot functions are!
### Details
If you poke around in the Dockerfile you'll see that we're simply adding the
file found in this directory, getting the `fdk-go` package to our workspace
and then building a binary and building an image with that binary. That then
gets deployed to dockerhub and fn.
For more robust projects, it's recommended to use a tool like `dep` or
`glide` to get dependencies such as the `fdk-go` into your functions.
Scoping out `func.go` you can see that the handler code only deals with input
and output, and doesn't have to deal with decoding the formatting from
functions (i.e. i/o is presented through `io.Writer` and `io.Reader`). This
makes it much easier to write hot functions.

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FROM fnproject/go:dev as build-stage
WORKDIR /function
ADD . /src
RUN go get github.com/fnproject/fdk-go
RUN cd /src && go build -o func
FROM fnproject/go
WORKDIR /function
COPY --from=build-stage /src/func /function/
ENTRYPOINT ["./func"]

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package main
import (
"context"
"encoding/json"
"fmt"
"io"
fdk "github.com/fnproject/fdk-go"
)
func main() {
fdk.Handle(fdk.HandlerFunc(myHandler))
}
func myHandler(ctx context.Context, in io.Reader, out io.Writer) {
var person struct {
Name string `json:"name"`
}
json.NewDecoder(in).Decode(&person)
if person.Name == "" {
person.Name = "world"
}
msg := struct {
Msg string `json:"msg"`
}{
Msg: fmt.Sprintf("Hello %s!\n", person.Name),
}
json.NewEncoder(out).Encode(&msg)
}

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package fdk
import (
"bufio"
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"strings"
"time"
)
type Handler interface {
Serve(ctx context.Context, in io.Reader, out io.Writer)
}
type HandlerFunc func(ctx context.Context, in io.Reader, out io.Writer)
func (f HandlerFunc) Serve(ctx context.Context, in io.Reader, out io.Writer) {
f(ctx, in, out)
}
// Context will return an *fn.Ctx that can be used to read configuration and
// request information from an incoming request.
func Context(ctx context.Context) *Ctx {
return ctx.Value(ctxKey).(*Ctx)
}
func WithContext(ctx context.Context, fnctx *Ctx) context.Context {
return context.WithValue(ctx, ctxKey, fnctx)
}
// Ctx provides access to Config and Headers from fn.
type Ctx struct {
Header http.Header
Config map[string]string
}
type key struct{}
var ctxKey = new(key)
// AddHeader will add a header on the function response, for hot function
// formats.
func AddHeader(out io.Writer, key, value string) {
if resp, ok := out.(*response); ok {
resp.header.Add(key, value)
}
}
// SetHeader will set a header on the function response, for hot function
// formats.
func SetHeader(out io.Writer, key, value string) {
if resp, ok := out.(*response); ok {
resp.header.Set(key, value)
}
}
// WriteStatus will set the status code to return in the function response, for
// hot function formats.
func WriteStatus(out io.Writer, status int) {
if resp, ok := out.(*response); ok {
resp.status = status
}
}
// Handle will run the event loop for a function. Handle should be invoked
// through main() in a user's function and can handle communication between the
// function and fn server via any of the supported formats.
func Handle(handler Handler) {
format, _ := os.LookupEnv("FN_FORMAT")
do(handler, format, os.Stdin, os.Stdout)
}
func do(handler Handler, format string, in io.Reader, out io.Writer) {
ctx := buildCtx()
switch format {
case "http":
doHTTP(handler, ctx, in, out)
case "json":
doJSON(handler, ctx, in, out)
case "default":
doDefault(handler, ctx, in, out)
default:
panic("unknown format (fdk-go): " + format)
}
}
// doDefault only runs once, since it is a 'cold' function
func doDefault(handler Handler, ctx context.Context, in io.Reader, out io.Writer) {
setHeaders(ctx, buildHeadersFromEnv())
ctx, cancel := ctxWithDeadline(ctx)
defer cancel()
handler.Serve(ctx, in, out)
}
// doHTTP runs a loop, reading http requests from in and writing
// http responses to out
func doHTTP(handler Handler, ctx context.Context, in io.Reader, out io.Writer) {
var buf bytes.Buffer
// maps don't get down-sized, so we can reuse this as it's likely that the
// user sends in the same amount of headers over and over (but still clear
// b/w runs) -- buf uses same principle
hdr := make(http.Header)
for {
err := doHTTPOnce(handler, ctx, in, out, &buf, hdr)
if err != nil {
break
}
}
}
func doJSON(handler Handler, ctx context.Context, in io.Reader, out io.Writer) {
var buf bytes.Buffer
hdr := make(http.Header)
for {
err := doJSONOnce(handler, ctx, in, out, &buf, hdr)
if err != nil {
break
}
}
}
type callRequestHTTP struct {
Type string `json:"type"`
RequestURL string `json:"request_url"`
Headers http.Header `json:"headers"`
}
type jsonIn struct {
Body string `json:"body"`
ContentType string `json:"content_type"`
CallID string `json:"call_id"`
Protocol callRequestHTTP `json:"protocol"`
}
type callResponseHTTP struct {
StatusCode int `json:"status_code,omitempty"`
Headers http.Header `json:"headers,omitempty"`
}
type jsonOut struct {
Body string `json:"body"`
ContentType string `json:"content_type"`
Protocol callResponseHTTP `json:"protocol,omitempty"`
}
func doJSONOnce(handler Handler, ctx context.Context, in io.Reader, out io.Writer, buf *bytes.Buffer, hdr http.Header) error {
buf.Reset()
resetHeaders(hdr)
var jsonResponse jsonOut
var jsonRequest jsonIn
resp := response{
Writer: buf,
status: 200,
header: hdr,
}
err := json.NewDecoder(in).Decode(&jsonRequest)
if err != nil {
// stdin now closed
if err == io.EOF {
return err
}
jsonResponse.Protocol.StatusCode = 500
jsonResponse.Body = fmt.Sprintf(`{"error": %v}`, err.Error())
} else {
setHeaders(ctx, jsonRequest.Protocol.Headers)
ctx, cancel := ctxWithDeadline(ctx)
defer cancel()
handler.Serve(ctx, strings.NewReader(jsonRequest.Body), &resp)
jsonResponse.Protocol.StatusCode = resp.status
jsonResponse.Body = buf.String()
jsonResponse.Protocol.Headers = resp.header
}
json.NewEncoder(out).Encode(jsonResponse)
return nil
}
func ctxWithDeadline(ctx context.Context) (context.Context, context.CancelFunc) {
fdkCtx := Context(ctx)
fnDeadline := fdkCtx.Header.Get("FN_DEADLINE") // this is always in headers
t, err := time.Parse(time.RFC3339, fnDeadline)
if err == nil {
return context.WithDeadline(ctx, t)
}
return context.WithCancel(ctx)
}
func doHTTPOnce(handler Handler, ctx context.Context, in io.Reader, out io.Writer, buf *bytes.Buffer, hdr http.Header) error {
buf.Reset()
resetHeaders(hdr)
resp := response{
Writer: buf,
status: 200,
header: hdr,
}
req, err := http.ReadRequest(bufio.NewReader(in))
if err != nil {
// stdin now closed
if err == io.EOF {
return err
}
// TODO it would be nice if we could let the user format this response to their preferred style..
resp.status = http.StatusInternalServerError
io.WriteString(resp, err.Error())
} else {
ctx, cancel := ctxWithDeadline(ctx)
defer cancel()
setHeaders(ctx, req.Header)
handler.Serve(ctx, req.Body, &resp)
}
hResp := http.Response{
ProtoMajor: 1,
ProtoMinor: 1,
StatusCode: resp.status,
Request: req,
Body: ioutil.NopCloser(buf),
ContentLength: int64(buf.Len()),
Header: resp.header,
}
hResp.Write(out)
return nil
}
func resetHeaders(m http.Header) {
for k := range m { // compiler optimizes this to 1 instruction now
delete(m, k)
}
}
// response is a general purpose response struct any format can use to record
// user's code responses before formatting them appropriately.
type response struct {
status int
header http.Header
io.Writer
}
var (
base = map[string]struct{}{
`FN_APP_NAME`: struct{}{},
`FN_PATH`: struct{}{},
`FN_METHOD`: struct{}{},
`FN_FORMAT`: struct{}{},
`FN_MEMORY`: struct{}{},
`FN_TYPE`: struct{}{},
}
headerPre = `FN_HEADER_`
exact = map[string]struct{}{
`FN_CALL_ID`: struct{}{},
`FN_METHOD`: struct{}{},
`FN_REQUEST_URL`: struct{}{},
}
)
func setHeaders(ctx context.Context, hdr http.Header) {
fctx := ctx.Value(ctxKey).(*Ctx)
fctx.Header = hdr
}
func buildCtx() context.Context {
ctx := &Ctx{
Config: buildConfig(),
// allow caller to build headers separately (to avoid map alloc)
}
return WithContext(context.Background(), ctx)
}
func buildConfig() map[string]string {
cfg := make(map[string]string, len(base))
for _, e := range os.Environ() {
vs := strings.SplitN(e, "=", 2)
if len(vs) < 2 {
vs = append(vs, "")
}
cfg[vs[0]] = vs[1]
}
return cfg
}
func buildHeadersFromEnv() http.Header {
env := os.Environ()
hdr := make(http.Header, len(env)-len(base))
for _, e := range env {
vs := strings.SplitN(e, "=", 2)
hdrKey := headerKey(vs[0])
if hdrKey == "" {
continue
}
if len(vs) < 2 {
vs = append(vs, "")
}
// rebuild these as 'http' headers
vs = strings.Split(vs[1], ", ")
for _, v := range vs {
hdr.Add(hdrKey, v)
}
}
return hdr
}
// for getting headers out of env
func headerKey(key string) string {
if strings.HasPrefix(key, headerPre) {
return strings.TrimPrefix(key, headerPre)
}
_, ok := exact[key]
if ok {
return key
}
return ""
}

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package fdk
import (
"bufio"
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/http/httputil"
"os"
"strings"
"testing"
)
func echoHTTPHandler(ctx context.Context, in io.Reader, out io.Writer) {
io.Copy(out, in)
WriteStatus(out, http.StatusTeapot+2)
SetHeader(out, "yo", "dawg")
}
func TestHandler(t *testing.T) {
inString := "yodawg"
var in bytes.Buffer
io.WriteString(&in, inString)
var out bytes.Buffer
echoHTTPHandler(buildCtx(), &in, &out)
if out.String() != inString {
t.Fatalf("this was supposed to be easy. strings no matchy: %s got: %s", inString, out.String())
}
}
func TestDefault(t *testing.T) {
inString := "yodawg"
var in bytes.Buffer
io.WriteString(&in, inString)
var out bytes.Buffer
doDefault(HandlerFunc(echoHTTPHandler), buildCtx(), &in, &out)
if out.String() != inString {
t.Fatalf("strings no matchy: %s got: %s", inString, out.String())
}
}
func JSONHandler(_ context.Context, in io.Reader, out io.Writer) {
var person struct {
Name string `json:"name"`
}
json.NewDecoder(in).Decode(&person)
if person.Name == "" {
person.Name = "world"
}
body := fmt.Sprintf("Hello %s!\n", person.Name)
err := json.NewEncoder(out).Encode(body)
if err != nil {
fmt.Fprintln(os.Stderr, err.Error())
}
}
func JSONWithStatusCode(_ context.Context, in io.Reader, out io.Writer) {
SetHeader(out, "Content-Type", "application/json")
WriteStatus(out, 201)
}
func TestJSON(t *testing.T) {
req := &jsonIn{
`{"name":"john"}`,
"application/json",
"someid",
callRequestHTTP{
Type: "json",
RequestURL: "someURL",
Headers: http.Header{},
},
}
var in bytes.Buffer
err := json.NewEncoder(&in).Encode(req)
if err != nil {
t.Fatal("Unable to marshal request")
}
var out, buf bytes.Buffer
err = doJSONOnce(HandlerFunc(JSONHandler), buildCtx(), &in, &out, &buf, make(http.Header))
if err != nil {
t.Fatal("should not return error", err)
}
JSONOut := &jsonOut{}
err = json.NewDecoder(&out).Decode(JSONOut)
if err != nil {
t.Fatal(err.Error())
}
if !strings.Contains(JSONOut.Body, "Hello john!") {
t.Fatalf("Output assertion mismatch. Expected: `Hello john!\n`. Actual: %v", JSONOut.Body)
}
if JSONOut.Protocol.StatusCode != 200 {
t.Fatalf("Response code must equal to 200, but have: %v", JSONOut.Protocol.StatusCode)
}
}
func TestFailedJSON(t *testing.T) {
dummyBody := "should fail with this"
in := strings.NewReader(dummyBody)
var out, buf bytes.Buffer
JSONOut := &jsonOut{}
err := doJSONOnce(HandlerFunc(JSONHandler), buildCtx(), in, &out, &buf, make(http.Header))
if err != nil {
t.Fatal("should not return error", err)
}
err = json.NewDecoder(&out).Decode(JSONOut)
if err != nil {
t.Fatal(err.Error())
}
if JSONOut.Protocol.StatusCode != 500 {
t.Fatalf("Response code must equal to 500, but have: %v", JSONOut.Protocol.StatusCode)
}
}
func TestJSONEOF(t *testing.T) {
var in, out, buf bytes.Buffer
err := doJSONOnce(HandlerFunc(JSONHandler), buildCtx(), &in, &out, &buf, make(http.Header))
if err != io.EOF {
t.Fatal("should return EOF")
}
}
func TestJSONOverwriteStatusCodeAndHeaders(t *testing.T) {
var out, buf bytes.Buffer
req := &jsonIn{
`{"name":"john"}`,
"application/json",
"someid",
callRequestHTTP{
Type: "json",
RequestURL: "someURL",
Headers: http.Header{},
},
}
var in bytes.Buffer
err := json.NewEncoder(&in).Encode(req)
if err != nil {
t.Fatal("Unable to marshal request")
}
err = doJSONOnce(HandlerFunc(JSONWithStatusCode), buildCtx(), &in, &out, &buf, make(http.Header))
if err != nil {
t.Fatal("should not return error", err)
}
JSONOut := &jsonOut{}
err = json.NewDecoder(&out).Decode(JSONOut)
if err != nil {
t.Fatal(err.Error())
}
if JSONOut.Protocol.StatusCode != 201 {
t.Fatalf("Response code must equal to 201, but have: %v", JSONOut.Protocol.StatusCode)
}
cType := JSONOut.Protocol.Headers.Get("Content-Type")
if !strings.Contains(cType, "application/json") {
t.Fatalf("Response content type should be application/json in this test, but have: %v", cType)
}
}
func TestHTTP(t *testing.T) {
// simulate fn writing us http requests...
bodyString := "yodawg"
in := HTTPreq(t, bodyString)
var out bytes.Buffer
ctx := buildCtx()
err := doHTTPOnce(HandlerFunc(echoHTTPHandler), ctx, in, &out, &bytes.Buffer{}, make(http.Header))
if err != nil {
t.Fatal("should not return error", err)
}
res, err := http.ReadResponse(bufio.NewReader(&out), nil)
if err != nil {
t.Fatal(err)
}
if res.StatusCode != http.StatusTeapot+2 {
t.Fatal("got wrong status code", res.StatusCode)
}
outBody, err := ioutil.ReadAll(res.Body)
if err != nil {
t.Fatal(err)
}
if res.Header.Get("yo") != "dawg" {
t.Fatal("expected yo dawg header, didn't get it")
}
if string(outBody) != bodyString {
t.Fatal("strings no matchy for http", string(outBody), bodyString)
}
}
func TestHTTPEOF(t *testing.T) {
var in bytes.Buffer
var out bytes.Buffer
ctx := buildCtx()
err := doHTTPOnce(HandlerFunc(echoHTTPHandler), ctx, &in, &out, &bytes.Buffer{}, make(http.Header))
if err != io.EOF {
t.Fatal("should return EOF")
}
}
func HTTPreq(t *testing.T, bod string) io.Reader {
req, err := http.NewRequest("GET", "http://localhost:8080/r/myapp/yodawg", strings.NewReader(bod))
if err != nil {
t.Fatal(err)
}
byts, err := httputil.DumpRequestOut(req, true)
if err != nil {
t.Fatal(err)
}
return bytes.NewReader(byts)
}