forked from benthosdev/benthos
/
http.go
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/
http.go
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// Copyright (c) 2018 Ashley Jeffs
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package processor
import (
"fmt"
"github.com/Jeffail/benthos/lib/log"
"github.com/Jeffail/benthos/lib/message"
"github.com/Jeffail/benthos/lib/metrics"
"github.com/Jeffail/benthos/lib/response"
"github.com/Jeffail/benthos/lib/types"
"github.com/Jeffail/benthos/lib/util/http/client"
)
//------------------------------------------------------------------------------
func init() {
Constructors[TypeHTTP] = TypeSpec{
constructor: NewHTTP,
description: `
Performs an HTTP request using a message batch as the request body, and replaces
the original message parts with the body of the response.
If the batch contains only a single message part then it will be sent as the
body of the request. If the batch contains multiple messages then they will be
sent as a multipart HTTP request using a ` + "`Content-Type: multipart`" + `
header.
If you are sending batches and wish to avoid this behaviour then you can set the
` + "`parallel`" + ` flag to ` + "`true`" + ` and the messages of a batch will
be sent as individual requests in parallel. You can also cap the max number of
parallel requests with ` + "`max_parallel`" + `. Alternatively, you can use the
` + "[`archive`](#archive)" + ` processor to create a single message
from the batch.
The URL and header values of this type can be dynamically set using function
interpolations described [here](../config_interpolation.md#functions).
In order to map or encode the payload to a specific request body, and map the
response back into the original payload instead of replacing it entirely, you
can use the ` + "[`process_map`](#process_map)" + ` or
` + "[`process_field`](#process_field)" + ` processors.`,
}
}
//------------------------------------------------------------------------------
// HTTPConfig contains configuration fields for the HTTP processor.
type HTTPConfig struct {
Client client.Config `json:"request" yaml:"request"`
Parallel bool `json:"parallel" yaml:"parallel"`
MaxParallel int `json:"max_parallel" yaml:"max_parallel"`
}
// NewHTTPConfig returns a HTTPConfig with default values.
func NewHTTPConfig() HTTPConfig {
return HTTPConfig{
Client: client.NewConfig(),
Parallel: false,
MaxParallel: 0,
}
}
//------------------------------------------------------------------------------
// HTTP is a processor that performs an HTTP request using the message as the
// request body, and returns the response.
type HTTP struct {
client *client.Type
parallel bool
max int
conf Config
log log.Modular
stats metrics.Type
mCount metrics.StatCounter
mErrHTTP metrics.StatCounter
mErr metrics.StatCounter
mSucc metrics.StatCounter
mSent metrics.StatCounter
mSentParts metrics.StatCounter
}
// NewHTTP returns a HTTP processor.
func NewHTTP(
conf Config, mgr types.Manager, log log.Modular, stats metrics.Type,
) (Type, error) {
g := &HTTP{
conf: conf,
log: log.NewModule(".processor.http"),
stats: stats,
parallel: conf.HTTP.Parallel,
max: conf.HTTP.MaxParallel,
mCount: stats.GetCounter("processor.http.count"),
mSucc: stats.GetCounter("processor.http.success"),
mErr: stats.GetCounter("processor.http.error"),
mErrHTTP: stats.GetCounter("processor.http.error.http"),
mSent: stats.GetCounter("processor.http.sent"),
mSentParts: stats.GetCounter("processor.http.parts.sent"),
}
var err error
if g.client, err = client.New(
conf.HTTP.Client,
client.OptSetLogger(g.log),
client.OptSetStats(metrics.Namespaced(g.stats, "processor.http")),
); err != nil {
return nil, err
}
return g, nil
}
//------------------------------------------------------------------------------
// ProcessMessage applies the processor to a message, either creating >0
// resulting messages or a response to be sent back to the message source.
func (h *HTTP) ProcessMessage(msg types.Message) ([]types.Message, types.Response) {
h.mCount.Incr(1)
var responseMsg types.Message
if !h.parallel || msg.Len() == 1 {
// Easy, just do a single request.
var err error
if responseMsg, err = h.client.Send(msg); err != nil {
if err != nil {
h.mErr.Incr(1)
h.mErrHTTP.Incr(1)
return nil, response.NewError(fmt.Errorf(
"HTTP request '%v' failed: %v", h.conf.HTTP.Client.URL, err,
))
}
}
} else {
// Hard, need to do parallel requests limited by max parallelism.
results := make([]types.Part, msg.Len())
msg.Iter(func(i int, p types.Part) error {
results[i] = p.Copy()
return nil
})
reqChan, resChan := make(chan int), make(chan error)
max := h.max
if max == 0 || msg.Len() < max {
max = msg.Len()
}
for i := 0; i < max; i++ {
go func() {
for index := range reqChan {
result, err := h.client.Send(message.Lock(msg, index))
if err == nil && result.Len() != 1 {
err = fmt.Errorf("unexpected response size: %v", result.Len())
}
if err == nil {
results[index] = result.Get(0)
}
resChan <- err
}
}()
}
go func() {
for i := 0; i < msg.Len(); i++ {
reqChan <- i
}
}()
for i := 0; i < msg.Len(); i++ {
if err := <-resChan; err != nil {
h.mErrHTTP.Incr(1)
h.log.Errorf("HTTP parallel request to '%v' failed: %v\n", h.conf.HTTP.Client.URL, err)
}
}
close(reqChan)
responseMsg = message.New(nil)
responseMsg.Append(results...)
}
if responseMsg.Len() < 1 {
h.mErr.Incr(1)
h.mErrHTTP.Incr(1)
return nil, response.NewError(fmt.Errorf(
"HTTP response from '%v' was empty", h.conf.HTTP.Client.URL,
))
}
h.mSucc.Incr(1)
msgs := [1]types.Message{responseMsg}
h.mSent.Incr(1)
h.mSentParts.Incr(int64(responseMsg.Len()))
return msgs[:], nil
}
//------------------------------------------------------------------------------