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handle.go
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handle.go
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/*
* Copyright © 2022 Atomist, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package skill
import (
"context"
"fmt"
"io"
"net/http"
"os"
"strings"
"time"
"olympos.io/encoding/edn"
)
// Start initiates startup of the skills given the provided Handlers
func Start(handlers Handlers) {
Log.Info("Starting skill...")
http.HandleFunc("/", CreateHttpHandlerWithLogger(handlers, nil))
port := os.Getenv("PORT")
if port == "" {
port = "8080"
}
Log.Debugf("Listening on port %s", port)
if err := http.ListenAndServe(":"+port, nil); err != nil {
Log.Fatal(err)
}
}
func CreateHttpHandler(handlers Handlers) func(http.ResponseWriter, *http.Request) {
return CreateHttpHandlerWithLogger(handlers, nil)
}
func CreateHttpHandlerWithLogger(handlers Handlers, loggerCreator CreateLogger) func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
handleStart := time.Now()
buf := new(strings.Builder)
rc := r.Body
defer rc.Close()
_, err := io.Copy(buf, rc)
if err != nil {
w.WriteHeader(201)
return
}
body := buf.String()
var event EventIncoming
err = edn.NewDecoder(strings.NewReader(body)).Decode(&event)
if err != nil {
w.WriteHeader(201)
return
}
name := NameFromEvent(event)
ctx := context.Background()
logger := createLogger(ctx, event, r.Header, loggerCreator)
req := RequestContext{
Event: event,
Log: logger,
ctx: ctx,
}
logger.Debugf("Skill request parsed in %d ms", time.Now().UnixMilli()-handleStart.UnixMilli())
defer func() {
if err := recover(); err != nil {
SendStatus(ctx, req, Status{
State: Failed,
Reason: fmt.Sprintf("Unsuccessfully invoked handler %s/%s@%s", event.Skill.Namespace, event.Skill.Name, name),
})
w.WriteHeader(201)
logger.Errorf("Unhandled error occurred: %v", err)
return
}
}()
start := time.Now()
logger.Debugf("Skill execution started")
if req.Event.Type != "sync-request" {
logger.Debugf("Incoming event message: %s", func() interface{} { return sanitizeEvent(body) })
}
defer func() {
logger.Debugf("Closing event handler '%s'", name)
logger.Debugf("Skill execution took %d ms", time.Now().UnixMilli()-start.UnixMilli())
}()
if handle, ok := handlers[name]; ok {
logger.Debugf("Invoking event handler '%s'", name)
err = SendStatus(ctx, req, Status{
State: running,
})
if err != nil {
Log.Panicf("Failed to send status: %s", err)
}
status := handle(ctx, req)
err = SendStatus(ctx, req, status)
if err != nil {
Log.Panicf("Failed to send status: %s", err)
}
w.WriteHeader(201)
if req.Event.Type == "sync-request" {
r := struct {
Result interface{} `edn:"result"`
}{
Result: status.SyncRequest,
}
b, err := edn.Marshal(r)
if err != nil {
Log.Panicf("Failed to edn result in sync-request: %s", err)
}
w.Write(b)
}
} else {
err = SendStatus(ctx, req, Status{
State: Failed,
Reason: fmt.Sprintf("Event handler '%s' not found", name),
})
w.WriteHeader(201)
}
}
}