forked from muesli/beehive
/
httpbee.go
167 lines (140 loc) 路 3.66 KB
/
httpbee.go
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/*
* Copyright (C) 2014-2017 Christian Muehlhaeuser
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authors:
* Christian Muehlhaeuser <muesli@gmail.com>
*/
// Package httpbee is a Bee that lets you trigger HTTP requests.
package httpbee
import (
"encoding/json"
"io/ioutil"
"net/http"
"net/url"
"strings"
"github.com/muesli/beehive/bees"
)
// HTTPBee is a Bee that lets you trigger HTTP requests.
type HTTPBee struct {
bees.Bee
addr string
path string
eventChan chan bees.Event
}
// Run executes the Bee's event loop.
func (mod *HTTPBee) Run(cin chan bees.Event) {
mod.eventChan = cin
select {
case <-mod.SigChan:
return
}
}
// Action triggers the action passed to it.
func (mod *HTTPBee) Action(action bees.Action) []bees.Placeholder {
outs := []bees.Placeholder{}
u := ""
action.Options.Bind("url", &u)
switch action.Name {
case "get":
resp, err := http.Get(u)
if err != nil {
mod.LogErrorf("Error: %s", err)
return outs
}
defer resp.Body.Close()
b, err := ioutil.ReadAll(resp.Body)
if err != nil {
mod.LogErrorf("Error: %s", err)
return outs
}
ev, err := mod.prepareResponseEvent(b)
if err == nil {
ev.Name = "get"
ev.Options.SetValue("url", "url", u)
mod.eventChan <- ev
}
case "post":
var err error
var b []byte
var j string
var form url.Values
var resp *http.Response
action.Options.Bind("json", &j)
action.Options.Bind("form", &form)
if j != "" {
buf := strings.NewReader(j)
resp, err = http.Post(u, "application/json", buf)
} else {
resp, err = http.PostForm(u, form)
}
if err != nil {
mod.LogErrorf("Error: %s", err)
return outs
}
defer resp.Body.Close()
b, err = ioutil.ReadAll(resp.Body)
if err != nil {
mod.LogErrorf("Error: %s", err)
return outs
}
ev, err := mod.prepareResponseEvent(b)
if err == nil {
ev.Name = "post"
ev.Options.SetValue("url", "url", u)
mod.eventChan <- ev
}
default:
panic("Unknown action triggered in " + mod.Name() + ": " + action.Name)
}
return outs
}
func (mod *HTTPBee) prepareResponseEvent(resp []byte) (bees.Event, error) {
ev := bees.Event{
Bee: mod.Name(),
Options: []bees.Placeholder{
{
Name: "data",
Type: "string",
Value: string(resp),
},
},
}
var payload interface{}
err := json.Unmarshal(resp, &payload)
if err == nil {
ev.Options.SetValue("json", "map", payload)
// this is a bit of a funny hack:
// each parameter in the JSON response will get mapped to an (undocumented) event parameter
// TODO: decide if this a good idea or not (probably not)
j := make(map[string]interface{})
err = json.Unmarshal(resp, &j)
if err == nil {
for k, v := range j {
mod.Logf("JSON param: %s = %+v\n", k, v)
if k == "json" || k == "data" {
continue
}
// FIXME: hard-coded 'string'
ev.Options.SetValue(k, "string", v)
}
}
}
return ev, nil
}
// ReloadOptions parses the config options and initializes the Bee.
func (mod *HTTPBee) ReloadOptions(options bees.BeeOptions) {
mod.SetOptions(options)
}