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5dc5740a54
* fn: runner status and docker load images Introducing a function run for pure runner Status calls. Previously, Status gRPC calls returned active inflight request counts with the purpose of a simple health checker. However this is not sufficient since it does not show if agent or docker is healthy. With this change, if pure runner is configured with a status image, that image is executed through docker. The call uses zero memory/cpu/tmpsize settings to ensure resource tracker does not block it. However, operators might not always have a docker repository accessible/available for status image. Or operators might not want the status to go over the network. To allow such cases, and in general possibly caching docker images, added a new environment variable FN_DOCKER_LOAD_FILE. If this is set, fn-agent during startup will load these images that were previously saved with 'docker save' into docker.
55 lines
959 B
Go
55 lines
959 B
Go
package main
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import (
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"bytes"
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"context"
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"encoding/json"
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"io"
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"io/ioutil"
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"log"
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fdk "github.com/fnproject/fdk-go"
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)
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func main() {
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fdk.Handle(fdk.HandlerFunc(myHandler))
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}
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func myHandler(ctx context.Context, in io.Reader, out io.Writer) {
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var input map[string]interface{}
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body, err := ioutil.ReadAll(in)
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if err != nil {
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log.Print("could not read input")
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fdk.WriteStatus(out, 530)
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return
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}
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err = json.Unmarshal(body, &input)
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if err != nil {
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log.Print("could not unmarshal json input")
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fdk.WriteStatus(out, 531)
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return
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}
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output, err := json.Marshal(&input)
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if err != nil {
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log.Print("could not marshal json output")
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fdk.WriteStatus(out, 532)
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return
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}
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written, err := io.Copy(out, bytes.NewReader(output))
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if err != nil {
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log.Print("could not write output")
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fdk.WriteStatus(out, 533)
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return
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}
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if written != int64(len(output)) {
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log.Print("partial write of output")
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fdk.WriteStatus(out, 534)
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return
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}
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}
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