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inproc.go
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/
inproc.go
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/**
* Copyright 2015 Comcast Cable Communications Management, LLC
*
* 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 jtl
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"time"
. "github.com/Comcast/eel/util"
)
// EventHandler processes incoming events (arbitrary JSON payloads) and places them on the worker pool queue.
// If certain headers are set (X-Debug, X-Sync) a response will be returned immediately bypassing the worker pool queue.
func EventHandler(w http.ResponseWriter, r *http.Request) {
ctx := Gctx.SubContext()
debug := false
sync := false
if r.Header.Get("X-Debug") == "true" {
debug = true
} else if r.Header.Get("X-Sync") == "true" || r.URL.Path == Gctx.ConfigValue(EelSyncPath).(string) {
sync = true
}
ctx.AddValue("start_ts", time.Now().UnixNano())
ctx.AddValue(EelRequestHeader, r.Header)
stats := ctx.Value(EelTotalStats).(*ServiceStats)
stats.IncInCount()
// adopt trace header if present
traceHeaderKey := GetConfig(ctx).HttpTransactionHeader
if r.Header.Get(traceHeaderKey) != "" {
ctx.AddLogValue("tx.traceId", r.Header.Get(traceHeaderKey))
ctx.AddValue("tx.traceId", r.Header.Get(traceHeaderKey))
ctx.AddValue(traceHeaderKey, r.Header.Get(traceHeaderKey))
} else {
ctx.AddLogValue("tx.traceId", ctx.Id())
ctx.AddValue("tx.traceId", ctx.Id())
ctx.AddValue(traceHeaderKey, ctx.Id())
}
// adopt tenant id if present
tenantHeaderKey := GetConfig(ctx).HttpTenantHeader
if r.Header.Get(tenantHeaderKey) != "" {
ctx.AddValue(EelTenantId, r.Header.Get(tenantHeaderKey))
ctx.AddValue(tenantHeaderKey, r.Header.Get(tenantHeaderKey))
ctx.AddLogValue(LogTenantId, r.Header.Get(tenantHeaderKey))
}
w.Header().Set("Content-Type", "application/json")
if r.ContentLength > GetConfig(ctx).MaxMessageSize {
ctx.Log().Error("status", "413", "action", "rejected", "error_type", "rejected", "cause", "message_too_large", "msg_length", r.ContentLength, "error", "message too large")
ctx.Log().Metric("rejected", M_Namespace, "xrs", M_Metric, "rejected", M_Unit, "Count", M_Dims, "app="+AppId+"&env="+EnvName+"&instance="+InstanceName, M_Val, 1.0)
w.WriteHeader(http.StatusRequestEntityTooLarge)
w.Write(GetResponse(ctx, StatusRequestTooLarge))
stats.IncErrors()
return
}
defer r.Body.Close()
r.Body = http.MaxBytesReader(w, r.Body, GetConfig(ctx).MaxMessageSize)
defer r.Body.Close()
if r.Method != "POST" {
ctx.Log().Error("status", "400", "action", "rejected", "error_type", "rejected", "cause", "http_post_required", "method", r.Method, "error", "post required")
ctx.Log().Metric("rejected", M_Namespace, "xrs", M_Metric, "rejected", M_Unit, "Count", M_Dims, "app="+AppId+"&env="+EnvName+"&instance="+InstanceName, M_Val, 1.0)
w.WriteHeader(http.StatusBadRequest)
w.Write(GetResponse(ctx, StatusHttpPostRequired))
stats.IncErrors()
return
}
body, err := ioutil.ReadAll(r.Body)
if err != nil {
ctx.Log().Error("status", "500", "action", "rejected", "error_type", "rejected", "cause", "error_reading_message", "error", err.Error())
ctx.Log().Metric("rejected", M_Namespace, "xrs", M_Metric, "rejected", M_Unit, "Count", M_Dims, "app="+AppId+"&env="+EnvName+"&instance="+InstanceName, M_Val, 1.0)
w.WriteHeader(http.StatusInternalServerError)
fmt.Fprintf(w, `{"error":"%s"}`, err.Error())
w.Write(GetResponse(ctx, StatusHttpPostRequired))
stats.IncErrors()
return
}
if body == nil || len(body) == 0 {
ctx.Log().Error("status", "400", "action", "rejected", "error_type", "rejected", "cause", "blank_message", "error", "blank message")
ctx.Log().Metric("rejected", M_Namespace, "xrs", M_Metric, "rejected", M_Unit, "Count", M_Dims, "app="+AppId+"&env="+EnvName+"&instance="+InstanceName, M_Val, 1.0)
w.WriteHeader(http.StatusBadRequest)
w.Write(GetResponse(ctx, StatusEmptyBody))
stats.IncErrors()
return
}
dc := ctx.Value(EelDuplicateChecker).(DuplicateChecker)
if dc.GetTtl() > 0 && dc.IsDuplicate(ctx, body) {
ctx.Log().Info("status", "200", "action", "dropping_duplicate")
ctx.Log().Metric("dropping_duplicate", M_Namespace, "xrs", M_Metric, "dropping_duplicate", M_Unit, "Count", M_Dims, "app="+AppId+"&env="+EnvName+"&instance="+InstanceName, M_Val, 1.0)
w.WriteHeader(http.StatusOK)
w.Write(GetResponse(ctx, StatusDuplicateEliminated))
stats.IncErrors()
return
}
// json validation maybe only in debug mode?
evt, err := NewJDocFromString(string(body))
if err != nil {
ctx.Log().Error("status", "400", "action", "rejected", "error_type", "rejected", "cause", "invalid_json", "error", err.Error(), "trace.in.data", string(body))
ctx.Log().Metric("rejected", M_Namespace, "xrs", M_Metric, "rejected", M_Unit, "Count", M_Dims, "app="+AppId+"&env="+EnvName+"&instance="+InstanceName, M_Val, 1.0)
w.WriteHeader(http.StatusBadRequest)
w.Write(GetResponse(ctx, StatusInvalidJson))
stats.IncErrors()
return
}
stats.IncBytesIn(len(body))
if GetConfig(ctx).LogParams != nil {
for k, v := range GetConfig(ctx).LogParams {
ev := evt.ParseExpression(ctx, v)
ctx.AddLogValue(k, ev)
}
}
if debug || sync {
ctx.Log().Info("status", "200", "action", "accepted")
ctx.Log().Metric("accepted", M_Namespace, "xrs", M_Metric, "accepted", M_Unit, "Count", M_Dims, "app="+AppId+"&env="+EnvName+"&instance="+InstanceName, M_Val, 1.0)
var events interface{}
events = handleEvent(ctx, stats, evt, string(body), debug, sync)
if sync {
switch events.(type) {
case []interface{}:
if len(events.([]interface{})) == 1 {
events = events.([]interface{})[0]
} else if len(events.([]interface{})) == 0 {
events = ""
}
}
}
buf, err := json.MarshalIndent(events, "", "\t")
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
w.Write(GetResponse(ctx, map[string]interface{}{"error": err.Error()}))
} else {
w.WriteHeader(http.StatusOK)
fmt.Fprintf(w, string(buf))
}
AddLatencyLog(ctx, stats, "stat.eel.time")
} else {
tenantId := ""
if ctx.Value(EelTenantId) != nil {
tenantId = ctx.Value(EelTenantId).(string)
}
dp := GetWorkDispatcher(ctx, tenantId)
if dp != nil {
work := WorkRequest{Raw: string(body), Event: evt, Ctx: ctx}
select {
case dp.WorkQueue <- &work:
ctx.Log().Info("status", "202", "action", "accepted")
ctx.Log().Metric("accepted", M_Namespace, "xrs", M_Metric, "accepted", M_Unit, "Count", M_Dims, "app="+AppId+"&env="+EnvName+"&instance="+InstanceName, M_Val, 1.0)
w.WriteHeader(http.StatusAccepted)
w.Write(GetResponse(ctx, StatusProcessed))
case <-time.After(time.Millisecond * time.Duration(GetConfig(ctx).MessageQueueTimeout)):
// consider spilling over to SQS here
ctx.Log().Error("status", "429", "action", "rejected", "error_type", "work_queue", "cause", "queue_full")
ctx.Log().Metric("rejected", M_Namespace, "xrs", M_Metric, "rejected", M_Unit, "Count", M_Dims, "app="+AppId+"&env="+EnvName+"&instance="+InstanceName, M_Val, 1.0)
// 408
//w.WriteHeader(http.StatusRequestTimeout)
// 429
w.WriteHeader(HttpStatusTooManyRequests)
w.Write(GetResponse(ctx, StatusQueueFull))
}
} else {
ctx.Log().Error("status", "500", "action", "rejected", "error_type", "worker_pool", "cause", "no_pool_for_tenant", "tenant_id", tenantId)
w.WriteHeader(http.StatusInternalServerError)
w.Write(GetResponse(ctx, StatusNoWorkerPool))
}
}
}