mirror of
https://github.com/fnproject/fn.git
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206aa3c203
* update vendor directory, add go.opencensus.io * update imports * oops * s/opentracing/opencensus/ & remove prometheus / zipkin stuff & remove old stats * the dep train rides again * fix gin build * deps from last guy * start in on the agent metrics * she builds * remove tags for now, cardinality error is fussing. subscribe instead of register * update to patched version of opencensus to proceed for now TODO switch to a release * meh fix imports * println debug the bad boys * lace it with the tags * update deps again * fix all inconsistent cardinality errors * add our own logger * fix init * fix oom measure * remove bugged removal code * fix s3 measures * fix prom handler nil
77 lines
1.9 KiB
Go
77 lines
1.9 KiB
Go
package fdk
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import (
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"context"
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"io"
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"net/http"
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"os"
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"github.com/fnproject/fdk-go/utils"
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)
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type Handler interface {
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Serve(ctx context.Context, in io.Reader, out io.Writer)
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}
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type HandlerFunc func(ctx context.Context, in io.Reader, out io.Writer)
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func (f HandlerFunc) Serve(ctx context.Context, in io.Reader, out io.Writer) {
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f(ctx, in, out)
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}
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// Context will return an *fn.Ctx that can be used to read configuration and
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// request information from an incoming request.
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func Context(ctx context.Context) *Ctx {
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utilsCtx := utils.Context(ctx)
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return &Ctx{
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Header: utilsCtx.Header,
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Config: utilsCtx.Config,
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}
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}
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func WithContext(ctx context.Context, fnctx *Ctx) context.Context {
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utilsCtx := &utils.Ctx{
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Header: fnctx.Header,
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Config: fnctx.Config,
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}
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return utils.WithContext(ctx, utilsCtx)
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}
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// Ctx provides access to Config and Headers from fn.
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type Ctx struct {
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Header http.Header
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Config map[string]string
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}
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// AddHeader will add a header on the function response, for hot function
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// formats.
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func AddHeader(out io.Writer, key, value string) {
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if resp, ok := out.(*utils.Response); ok {
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resp.Header.Add(key, value)
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}
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}
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// SetHeader will set a header on the function response, for hot function
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// formats.
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func SetHeader(out io.Writer, key, value string) {
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if resp, ok := out.(*utils.Response); ok {
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resp.Header.Set(key, value)
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}
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}
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// WriteStatus will set the status code to return in the function response, for
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// hot function formats.
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func WriteStatus(out io.Writer, status int) {
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if resp, ok := out.(*utils.Response); ok {
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resp.Status = status
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}
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}
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// Handle will run the event loop for a function. Handle should be invoked
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// through main() in a user's function and can handle communication between the
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// function and fn server via any of the supported formats.
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func Handle(handler Handler) {
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format, _ := os.LookupEnv("FN_FORMAT")
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utils.Do(handler, format, os.Stdin, os.Stdout)
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}
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