/
producer_api.go
258 lines (222 loc) · 5.95 KB
/
producer_api.go
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package haystack
import (
"fmt"
"github.com/go-martini/martini"
"github.com/martini-contrib/binding"
kinesis "github.com/sendgridlabs/go-kinesis"
"io/ioutil"
"log"
"net/http"
"os"
"strings"
"time"
)
// Base struct for Haystack producer
type Producer struct {
Conn *kinesis.Kinesis
}
// LogFile passes logging messages to a flatfile
func LogFile(message string) {
f, err := os.OpenFile("haystack_producer_messages.log", os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
if err != nil {
log.Printf("error opening file: %v", err)
}
defer f.Close()
log.SetOutput(f)
log.Println(message)
}
// generate a dictionary from passed params
func GenDict(data []string) map[string]string {
r_map := make(map[string]string)
for i, _ := range data {
x := strings.Split(data[i], "_")
answer := ""
if len(x) == 2 {
answer = x[1]
}
r_map[x[0]] = answer
}
return r_map
}
// PassQuery sends the message to a given stream
func PassQuery(stream string, message string) (ok bool) {
return true
}
// Authentication key struct
type Keys struct {
AccessKey string
SecretKey string
}
// SetEnv stores keys as environment vars
func (k *Keys) SetEnv() {
err := os.Setenv("AWS_ACCESS_KEY", k.AccessKey)
err = os.Setenv("AWS_SECRET_KEY", k.SecretKey)
if err != nil {
log.Fatalln("Failed to set environment vars")
}
}
// loadTokens imports auth keys from rootkey.csv (AWS keyset)
func loadTokens(key *Keys) bool {
if tokens, err := ioutil.ReadFile("rootkey.csv"); err == nil {
temp := strings.Split(string(tokens), "\n")
if len(temp) == 2 {
key.AccessKey = strings.SplitAfter(temp[0], "=")[1]
key.SecretKey = strings.SplitAfter(temp[1], "=")[1]
return true
}
}
log.Println("Error loading tokens from rootkey.csv")
return false
}
// InitKinesis initialises a connection to the Kinesis service
func InitKinesis() (*kinesis.Kinesis, bool) {
k := new(Keys)
if ok := loadTokens(k); ok {
ksis := kinesis.New(k.AccessKey, k.SecretKey)
return ksis, true
}
return nil, false
}
// CheckStream verifies whether a stream already exists
func CheckStream(k *kinesis.Kinesis, streamname string) bool {
args := kinesis.NewArgs()
args.Add("StreamName", streamname)
temp, err := k.ListStreams(args)
if err != nil {
log.Println("Could not obtain list of streams.")
} else {
for _, b := range temp.StreamNames {
if b == streamname {
return true
}
}
}
return false
}
// CreateStream creates a new stream
func CreateStream(k *kinesis.Kinesis, tempStreamName string, shards int) bool {
if err := k.CreateStream(tempStreamName, shards); err != nil {
return false
}
// wait for Stream ready state
timeout := make(chan bool, 30)
resp := &kinesis.DescribeStreamResp{}
log.Printf("Waiting for stream to be created")
for {
args := kinesis.NewArgs()
args.Add("StreamName", tempStreamName)
resp, _ = k.DescribeStream(args)
log.Printf(".")
if resp.StreamDescription.StreamStatus != "ACTIVE" {
time.Sleep(4 * time.Second)
timeout <- true
} else {
break
}
}
return true
}
// DeleteStream deletes an existing stream
func DeleteStream(k *kinesis.Kinesis, streamName string) bool {
if err := k.DeleteStream(streamName); err == nil {
return true
}
return false
}
// SendMessage generates a new JSON blob and sends to a stream
func SendMessage(k *kinesis.Kinesis, streamName string, msg *Message, comms chan bool) {
args := kinesis.NewArgs()
args.Add("StreamName", streamName)
args.Add("PartitionKey", fmt.Sprintf("partitionKey-%d", 1))
if data, ok := msg.ToJSON(); ok {
args.AddData(data)
if _, err := k.PutRecord(args); err == nil {
comms <- true
return
}
}
log.Println("Failed to send message")
comms <- false
return
}
// ServerInit launches the Producer endpoint
// ...need to figure out how to do graceful shutdown.
func ServerInit(quit chan bool) {
// Init main handler of RESTful endpoints
m := martini.Classic()
// Init Kinesis comms object
streamName := "testStream"
k, ok := InitKinesis()
if !ok {
log.Fatalln("Could not init connection to Kinesis server")
}
// check if stream exists, create if not
if test := CheckStream(k, streamName); !test {
if ok := CreateStream(k, streamName, 1); !ok {
log.Fatalln("Failed to create stream.")
}
}
// make a buffered comms channel
ch := make(chan bool, 100)
// Process message passed via GET request
m.Get("/log", func(res http.ResponseWriter, r *http.Request) (int, string) {
block := strings.SplitAfter(r.RequestURI, "/log?")[1]
var data []string
if strings.Contains(block, "%7C") {
data = strings.Split(strings.SplitAfter(r.RequestURI, "/log?")[1], "&")
} else {
data = strings.Split(strings.SplitAfter(r.RequestURI, "/log?")[1], "&")
}
for _, b := range data {
log.Println("d: " + b)
}
tempMessage := &Message{
data[0], // uid
"test.com/testpage.html", // ref site
time.Now().String(), // timestamp
"Pageview", // event type
fmt.Sprintf("{'data': %s}", data[1])}
go SendMessage(k, streamName, tempMessage, ch)
res.Header().Set("Content-Type", "application/json")
return 200, "{'status': 'ok'}"
})
m.Patch("/", func() {
// update something
})
// Process message passed via POST request
m.Post("/log", binding.Json(Message{}), binding.ErrorHandler,
func(msg Message, params martini.Params, r *http.Request, res http.ResponseWriter) (int, string) {
msg.Timestamp = time.Now().String()
res.Header().Set("Content-Type", "application/json")
go SendMessage(k, streamName, &msg, ch)
if out, ok := msg.ToJSON(); ok {
return 200, string(out)
}
return 501, ""
})
m.Put("/", func() {
// replace something
})
m.Delete("/", func() {
// destroy something
})
m.Options("/", func() {
// http options
})
m.NotFound(func() string {
// handle 404
log.Printf("%s\n", "Yep...")
return "Something went wrong."
})
//m.Run()
err := http.ListenAndServe(":5004", m)
if err != nil {
log.Fatal(err)
}
// quit if told to
// have a feeling this won't work
select {
case <-quit:
return
}
}