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updateTerminal.go
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updateTerminal.go
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package main
import (
"encoding/json"
"errors"
"fmt"
"image"
"io"
"io/ioutil"
"log"
"net/http"
"net/url"
"os"
"strconv"
"strings"
"time"
//Worker management
"context"
"golang.org/x/sync/semaphore"
"regexp"
"runtime"
//GC
"runtime/debug"
)
//Get all terminals' FB page info
func getAllTerminalsInfo(terminalArray []Terminal) {
//Spawn goroutine to download and process each terminal facebook page about info
ctx := context.TODO()
var maxWorkers int
var sem *semaphore.Weighted
maxWorkers = runtime.GOMAXPROCS(0)
//maxWorkers = 1
sem = semaphore.NewWeighted(int64(maxWorkers))
for i, _ := range terminalArray {
if err := sem.Acquire(ctx, 1); err != nil {
log.Printf("Failed to acquire semaphore: %v\n", err)
break
}
go func(t *Terminal) {
defer sem.Release(1)
log.Printf("Getting info for terminal %v\n", (*t).Title)
if err := t.getAndSetTerminalInfo(); err != nil {
displayErrorForTerminal((*t), err.Error())
} else {
//fmt.Println((*t).PageInfoEdge)
incrementValidTerminals() //No error for first api call to terminal = valid FB id
}
}(&terminalArray[i])
}
if err := sem.Acquire(ctx, int64(maxWorkers)); err != nil {
log.Printf("Failed to acquire semaphore: %v\n", err)
}
}
//Get t *Terminal FB page info
func (t *Terminal) getAndSetTerminalInfo() (err error) {
//Create request url and parameters
apiUrl := GRAPH_API_URL
resource := fmt.Sprintf("%v/%v/", GRAPH_API_VERSION, (*t).Id)
data := url.Values{}
//Multiple url.Values.Add will Encode to k=v&k=v. Facebook only processes last key.
data.Add(GRAPH_FIELDS_KEY, fmt.Sprintf("%v,%v,%v", GRAPH_FIELD_PHONE_KEY, GRAPH_FIELD_EMAILS_KEY, GRAPH_FIELD_GENERAL_INFO_KEY))
data.Add(GRAPH_ACCESS_TOKEN_KEY, GRAPH_ACCESS_TOKEN)
u, _ := url.ParseRequestURI(apiUrl)
u.Path = resource
urlStr := fmt.Sprintf("%v?%v", u, data.Encode())
//log.Println(urlStr)
//Create request
var req *http.Request
var client *http.Client
client = &http.Client{
Timeout: time.Second * 20}
if req, err = http.NewRequest("GET", urlStr, nil); err != nil {
return
}
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
req.Header.Add("Content-Length", strconv.Itoa(len(data.Encode())))
//Make request
var resp *http.Response
if resp, err = client.Do(req); err != nil {
return
}
//Read response body into []byte
defer resp.Body.Close()
var body []byte
if body, err = ioutil.ReadAll(resp.Body); err != nil {
//"Error reading page photos edge resp."
return
}
//Unmarshall into struct
var pageInfoEdge PageInfoEdge
if err = json.Unmarshal(body, &pageInfoEdge); err != nil {
//"Error unmarshaling page info edge."
return
}
//Trim phone number and email
//TODO: Add regex for phone number :(
phoneSpaceIndex := strings.Index(pageInfoEdge.Phone, " ")
if phoneSpaceIndex > 10 { //Trim only if space found after 10th digit. In case managers input a space in the beginning of the phone number.
pageInfoEdge.Phone = pageInfoEdge.Phone[:phoneSpaceIndex]
}
if len(pageInfoEdge.Emails) > 0 {
spaceIndex := strings.Index(pageInfoEdge.Emails[0], " ")
if spaceIndex > 10 { //Trim only if space found after 10th char for minlen("@us.af.mil"). In case managers input a space in the beginning of the phone number.
pageInfoEdge.Emails[0] = pageInfoEdge.Emails[0][:spaceIndex]
}
if len(pageInfoEdge.Emails[0]) > 255 {
pageInfoEdge.Emails[0] = pageInfoEdge.Emails[0][:255]
}
}
if len(pageInfoEdge.Phone) > 50 {
pageInfoEdge.Phone = pageInfoEdge.Phone[:50]
}
if len(pageInfoEdge.GeneralInfo) > 2048 {
pageInfoEdge.GeneralInfo = pageInfoEdge.GeneralInfo[:2048]
}
//Check for error
if pageInfoEdge.Error.Code != 0 {
err = fmt.Errorf("Code %v\nMessage %v", pageInfoEdge.Error.Code, pageInfoEdge.Error.Message)
return
}
(*t).PageInfoEdge = pageInfoEdge
return
}
//Update flights for all terminals in terminalMap map[string]Terminal
//Calls fuzzy model creation and release
func updateAllTerminalsFlights(terminalMap map[string]Terminal) {
resetStatistics()
var startTime, endTime time.Time
startTime = time.Now()
//Set live stats info
setLiveTotalTerminals(len(terminalMap))
//Create fuzzy models for lookup
if err := createFuzzyModels(); err != nil {
log.Fatal(err)
}
for _, v := range terminalMap {
if err := updateTerminalFlights(v); err != nil {
displayErrorForTerminal(v, err.Error())
}
incrementLiveTerminalsUpdated()
}
//Tear down fuzzy models to release memory
destroyFuzzyModels()
endTime = time.Now()
log.Printf("Terminal Flights Update ended.\nStart time: %v\n End time: %v\nElapsed time: %v\n", startTime, endTime, endTime.Sub(startTime))
displayStatistics()
debug.FreeOSMemory()
}
//Update targetTerminal flights
func updateTerminalFlights(targetTerminal Terminal) (err error) {
var terminalId string
terminalId = targetTerminal.Id
//Make sure Terminal struct is ready for use
if len(terminalId) == 0 {
log.Fatal("Terminal %v missing Id.\n", targetTerminal.Title)
return
}
//Request Albums edge from Graph API
//Try to find 72 hour album id. If no 72 hour album found, use terminal id.
var albumId string
if albumId, err = find72HrAlbumId(targetTerminal); err != nil {
return
}
if len(albumId) == 0 {
albumId = targetTerminal.Id
displayErrorForTerminal(targetTerminal, "72 hour album not found.")
} else {
displayMessageForTerminal(targetTerminal, "72 hour album found id " + albumId + ".")
incrementTerminalsWith72HRAlbum()
}
//Request Photos edge from Graph API
var photosEdge PhotosEdge
if photosEdge, err = getPhotosEdge(albumId); err != nil {
return
}
//Look at the photo nodes returned by the photos edge
var limit int
limit = 4
if len(photosEdge.Data) < limit {
limit = len(photosEdge.Data)
}
//Spawn goroutine to download and process each image
ctx := context.TODO()
var maxWorkers int
var sem *semaphore.Weighted
maxWorkers = runtime.GOMAXPROCS(0)
//maxWorkers = 1
sem = semaphore.NewWeighted(int64(maxWorkers))
displayMessageForTerminal(targetTerminal, fmt.Sprintf("Starting update with %v workers.", maxWorkers))
var errorCount, flightsFound int
for photoIndex := 0; photoIndex < limit; photoIndex++ {
if err := sem.Acquire(ctx, 1); err != nil {
log.Printf("Failed to acquire semaphore: %v\n", err)
break
}
go func(edgePhoto PhotosEdgePhoto, t Terminal) {
defer sem.Release(1)
var flightsFoundInPhoto int
var err error
if flightsFoundInPhoto, err = processPhotoNode(edgePhoto, t); err != nil {
displayErrorForTerminal(t, err.Error())
errorCount++
}
flightsFound += flightsFoundInPhoto
}(photosEdge.Data[photoIndex], targetTerminal)
}
if err := sem.Acquire(ctx, int64(maxWorkers)); err != nil {
log.Printf("Failed to acquire semaphore: %v\n", err)
}
if errorCount == 0 {
incrementNoErrorTerminals()
}
if flightsFound > 0 {
incrementFoundFlightsTerminals()
}
return
}
//Find 72Hr Album Id for Terminal
func find72HrAlbumId(t Terminal) (albumId string, err error) {
//Create request url and parameters
apiUrl := GRAPH_API_URL
resource := fmt.Sprintf("%v/%v/%v", GRAPH_API_VERSION, t.Id, GRAPH_EDGE_ALBUMS)
data := url.Values{}
data.Add(GRAPH_ACCESS_TOKEN_KEY, GRAPH_ACCESS_TOKEN)
data.Add(GRAPH_FIELDS_KEY, fmt.Sprintf("%v,%v,%v", GRAPH_FIELD_UPDATED_TIME_KEY, GRAPH_FIELD_NAME_KEY, GRAPH_FIELD_ID_KEY))
u, _ := url.ParseRequestURI(apiUrl)
u.Path = resource
urlStr := fmt.Sprintf("%v?%v", u, data.Encode())
//log.Println(urlStr)
//Create request
var req *http.Request
var client *http.Client
client = &http.Client{
Timeout: time.Second * 20}
if req, err = http.NewRequest("GET", urlStr, nil); err != nil {
return
}
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
req.Header.Add("Content-Length", strconv.Itoa(len(data.Encode())))
//Make request
var resp *http.Response
if resp, err = client.Do(req); err != nil {
return
}
//Read response body into []byte
defer resp.Body.Close()
var body []byte
if body, err = ioutil.ReadAll(resp.Body); err != nil {
//"Error reading page photos edge resp."
return
}
//Unmarshall into struct
var pageAlbumsEdge AlbumsEdge
if err = json.Unmarshal(body, &pageAlbumsEdge); err != nil {
//"Error unmarshaling page photos edge."
return
}
//fmt.Printf("%v\n", string(body))
//Check for error
if pageAlbumsEdge.Error.Code != 0 {
err = fmt.Errorf("Code %v\nMessage %v", pageAlbumsEdge.Error.Code, pageAlbumsEdge.Error.Message)
return
}
var Hr72Regex *regexp.Regexp
//Match Date Month Year. Capture date and year
if Hr72Regex, err = regexp.Compile("(?i)72.*(?:hour|hr)"); err != nil {
return
}
//Find albums matching regex and latest of those matching albums
latestAlbumnTime := time.Now().Add(-7 * 24 * time.Hour) //Set max 72hr album age as 1 week.
for _, album := range pageAlbumsEdge.Data {
log.Println(album)
if regexResult := Hr72Regex.FindStringSubmatch(album.Name); regexResult != nil {
var albumUpdatedTime time.Time
layout := "2006-01-02T15:04:05-0700"
log.Println(album.Name)
//Found match for 72 hr album name
//determine latest album
if albumUpdatedTime, err = time.Parse(layout, album.UpdatedTime); err != nil {
return
}
log.Println(albumUpdatedTime)
log.Println(latestAlbumnTime)
if albumUpdatedTime.After(latestAlbumnTime) {
albumId = album.Id
latestAlbumnTime = albumUpdatedTime
}
}
}
return
}
//Request PhotosEdge from Graph API
func getPhotosEdge(id string) (photosEdge PhotosEdge, err error) {
//Create request url and parameters
apiUrl := GRAPH_API_URL
resource := fmt.Sprintf("%v/%v/%v", GRAPH_API_VERSION, id, GRAPH_EDGE_PHOTOS)
data := url.Values{}
data.Add(GRAPH_TYPE_KEY, GRAPH_TYPE_UPLOADED_KEY)
data.Add(GRAPH_ACCESS_TOKEN_KEY, GRAPH_ACCESS_TOKEN)
data.Add(GRAPH_FIELDS_KEY, fmt.Sprintf("%v,%v,%v", GRAPH_FIELD_UPDATED_TIME_KEY, GRAPH_FIELD_NAME_KEY, GRAPH_FIELD_ID_KEY))
u, _ := url.ParseRequestURI(apiUrl)
u.Path = resource
urlStr := fmt.Sprintf("%v?%v", u, data.Encode())
//log.Println(urlStr)
//Create request
var req *http.Request
var client *http.Client
client = &http.Client{
Timeout: time.Second * 20}
if req, err = http.NewRequest("GET", urlStr, nil); err != nil {
return
}
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
req.Header.Add("Content-Length", strconv.Itoa(len(data.Encode())))
//Make request
var resp *http.Response
if resp, err = client.Do(req); err != nil {
return
}
//Read response body into []byte
defer resp.Body.Close()
var body []byte
if body, err = ioutil.ReadAll(resp.Body); err != nil {
//"Error reading page photos edge resp."
return
}
//Unmarshall into struct
if err = json.Unmarshal(body, &photosEdge); err != nil {
//"Error unmarshaling page photos edge."
return
}
//displayMessageForTerminal(targetTerminal, "Read page photos edge.")
//fmt.Printf("%v\n", string(body))
//Check for error
if photosEdge.Error.Code != 0 {
err = fmt.Errorf("Code %v\nMessage %v", photosEdge.Error.Code, photosEdge.Error.Message)
return
}
return
}
//Download, save, OCR a photo from Photos Edge
func processPhotoNode(edgePhoto PhotosEdgePhoto, targetTerminal Terminal) (flightsFound int, err error) {
//Check if photo created within X timeframe (made recently?)
var photoUpdatedTime time.Time
//http://stackoverflow.com/questions/24401901/time-parse-why-does-golang-parses-the-time-incorrectly
layout := "2006-01-02T15:04:05-0700"
if photoUpdatedTime, err = time.Parse(layout, edgePhoto.UpdatedTime); err != nil{
return
}
//log.Println(photoUpdatedTime)
//If image is too old, ignore
if time.Since(photoUpdatedTime) > time.Hour*24 {
displayMessageForTerminal(targetTerminal, edgePhoto.Id+" over 24 hours old.")
return
}
incrementPhotosFound()
//displayMessageForTerminal(targetTerminal, fmt.Sprintf("Downloading recent photo %v",photoIndex+1))
var saveTypes []SaveImageType
saveTypes = []SaveImageType{SAVE_IMAGE_TRAINING, SAVE_IMAGE_TRAINING_PROCESSED_BLACK, SAVE_IMAGE_TRAINING_PROCESSED_WHITE}
tmpSlide := Slide{
SaveType: saveTypes[0],
Terminal: targetTerminal,
FBNodeId: edgePhoto.Id,
FBCreatedTime: time.Time{}}
//Request Photo node for slide
var photoNode PhotoNode
//Only do network operations to fetch image if not in DEBUG_MANUAL_IMAGE_FILE_TARGET true mode
if DEBUG_MANUAL_IMAGE_FILE_TARGET {
} else {
if photoNode, err = getPhotoNodeForSlide(tmpSlide); err != nil {
return
}
//Download and Save Image for Photo node
if err = downloadAndSaveImageForPhotoNode(photoNode, &tmpSlide); err != nil {
return
}
}
//DEBUG
//Download only
//return
var slides []Slide
slides = make([]Slide, 0)
for _, currentSaveType := range saveTypes {
var newSlide Slide
newSlide.SaveType = currentSaveType
newSlide.Extension = tmpSlide.Extension
newSlide.Terminal = targetTerminal
newSlide.FBNodeId = edgePhoto.Id
newSlide.FBCreatedTime = photoUpdatedTime
//Manual slide control
//newSlide.Extension = "jpeg"
//newSlide.FBNodeId = "1630035233732546"
//newSlide.FBNodeId = "1600297960039607"
//newSlide.FBNodeId = "1600298003372936"
//create processed image in imagemagick IF slide created is not original slide
if currentSaveType != SAVE_IMAGE_TRAINING {
if err = runImageMagickColorProcess(SAVE_IMAGE_TRAINING, newSlide); err != nil {
return
}
}
if err = doOCRForSlide(&newSlide, OCR_WHITELIST_NORMAL); err != nil {
return
}
slides = append(slides, newSlide)
}
//Find date displayed in photo. Pick best date from slides.
var slideDate time.Time
if slideDate, err = findDateOfPhotoNodeSlides(slides); err != nil {
return
}
//Display found date
displayMessageForTerminal(slides[0].Terminal, fmt.Sprintf("%v found date for photo node \u001b[1m\u001b[31m%v\u001b[0m", slides[0].FBNodeId, slideDate.Format("02 Jan 2006 -0700")))
//Get dest bbox
//TODO: Find bounds of destination column and crop to get better OCR results.
var destLabelBBox image.Rectangle
if destLabelBBox, err = findLabelBoundsOfPhotoNodeSlides(slides, KEYWORD_DESTINATION); err != nil {
return
}
//Find potential rollcall times from all slides
var rollCalls []RollCall
var rollCallsNoBBox []RollCall
//Check if Destination label is over 0.5 (threshold constant) of total image height. If too low on image, Destination Label may be incorrect.
var destLabelValid bool
if destLabelValid, err = slides[0].isYCoordinateWithinHeightPercentage(destLabelBBox.Min.Y, DESTINATION_TEXT_VERTICAL_THRESHOLD); err != nil {
return
}
if !destLabelValid { //
destLabelBBox.Min.Y = 0
}
if rollCalls, rollCallsNoBBox, err = findRollCallTimesFromSlides(slides, slideDate, destLabelBBox.Min.Y); err != nil {
return
}
//Print any not found in hOCR rollcalls
if len(rollCallsNoBBox) > 0 {
fmt.Println("rollcalls w/o bbox", rollCallsNoBBox)
}
//Get seats bbox
var seatsLabelBBox image.Rectangle
if seatsLabelBBox, err = findLabelBoundsOfPhotoNodeSlides(slides, KEYWORD_SEATS); err != nil {
return
}
//Find potential seats
var seatsAvailable []SeatsAvailable
if seatsAvailable, err = findSeatsAvailableFromSlides(slides, seatsLabelBBox); err != nil {
return
}
//Find potential destinations from all slides
var destinations []Destination
if destinations, err = findDestinationsFromSlides(slides, destLabelBBox.Min.Y); err != nil {
return
}
deleteTerminalFromDestArray(&destinations, slides[0].Terminal)
deleteLowDestsFromDestArray(&destinations, slides[0])
//Print roll calls object.
fmt.Println("found rcs in all slides")
for _, rc := range rollCalls {
log.Println(rc)
}
//Print destination object. Shows spelling found and distance.
fmt.Println("found dests in all slides")
for _, d := range destinations {
log.Println(d)
}
//return
//Find vertically closest Destination for every RollCall
linkRollCallsToNearestDestinations(rollCalls, destinations)
/*
fmt.Println("After nearest rc to dest link")
for _, d := range destinations {
log.Println(d)
if d.LinkedRollCall != nil {
log.Println(*(d.LinkedRollCall))
}
}
*/
//Link SeatsAvailable with RollCalls on same line
linkRollCallsToNearestSeatsAvailable(rollCalls, seatsAvailable)
/*
fmt.Println("After link seats")
for _, rc := range rollCalls {
log.Println(rc)
if rc.LinkedSeatsAvailable != nil {
log.Println(*(rc.LinkedSeatsAvailable))
}
}
*/
//Find vertically closest Destination for every SeatsAvailable
linkDestinationsToNearestSeatsAvailable(destinations, seatsAvailable)
//Create array of individual Grouping for each Destination to pass into combine Destinations to Groupings stage
var destinationGroupings []Grouping
for _, d := range destinations {
destinationGroupings = append(destinationGroupings, Grouping{
Destinations: []Destination{d},
LinkedRollCall: d.LinkedRollCall})
destinationGroupings[len(destinationGroupings)-1].updateBBox()
}
//Link GroupingA with nearest GroupingB so all Destinations in GroupingB are in GroupingA. Repeat until GroupingA contains a Destination that (horizontally) intersects a RollCall.
combineDestinationGroupsToAnchorDestinations(&destinationGroupings)
//Print out found flights
fmt.Println("After combine dests:")
for _, dg := range destinationGroupings {
if dg.LinkedRollCall != nil {
fmt.Printf("%v - ", (*dg.LinkedRollCall).Time.Format("\u001b[1m\u001b[35m‣ 02JAN2006 1504 MST -0700\u001b[0m"))
if (*dg.LinkedRollCall).LinkedSeatsAvailable != nil {
fmt.Printf("%v%v\n", (*(*dg.LinkedRollCall).LinkedSeatsAvailable).Number, (*(*dg.LinkedRollCall).LinkedSeatsAvailable).Letter)
} else {
fmt.Println("No seat text found.")
}
} else {
fmt.Println("No time for grouping.")
}
for _, d := range dg.Destinations {
fmt.Println(d.TerminalTitle)
}
}
//Create list of flights,
//Initially Destination is a flight.
//Structure: flight -> Destination -> LinkedRollCall * -> LinkedSeatsAvailable *
//Convert Destinations to Flight struct and add
var finalFlights []Flight
for dgIndex, _ := range destinationGroupings {
//Link RollCall to all Destinations in Grouping (if RollCall linked)
//Add to each Destination final flights list
for dIndex, _ := range destinationGroupings[dgIndex].Destinations {
if destinationGroupings[dgIndex].LinkedRollCall != nil {
destinationGroupings[dgIndex].Destinations[dIndex].LinkedRollCall = destinationGroupings[dgIndex].LinkedRollCall
//Link Destination to Grouping.LinkedRollCall.LinkedSeatsAvailable if no Destination linked seats already
if destinationGroupings[dgIndex].Destinations[dIndex].LinkedSeatsAvailable == nil {
destinationGroupings[dgIndex].Destinations[dIndex].LinkedSeatsAvailable = (*destinationGroupings[dgIndex].LinkedRollCall).LinkedSeatsAvailable
}
}
/*
//Do not add any destinations without roll calls
if destinationGroupings[dgIndex].Destinations[dIndex].LinkedRollCall == nil {
continue
}
*/
//Set Flight.UnknownRollCallDate if applicable
//Check if date was NOT found by comparing to "blank" time.Time
var unknownRCDate bool
if slideDate.Equal(time.Time{}) {
unknownRCDate = true
} else {
incrementPhotosFoundDateHeader()
}
//Create Flight struct to add to slice
tmpFlight := Flight{
Origin: slides[0].Terminal.Title,
Destination: destinationGroupings[dgIndex].Destinations[dIndex].TerminalTitle,
UnknownRollCallDate: unknownRCDate,
PhotoSource: slides[0].FBNodeId,
SourceDate: slides[0].FBCreatedTime}
if destinationGroupings[dgIndex].Destinations[dIndex].LinkedRollCall != nil {
tmpFlight.RollCall = (*destinationGroupings[dgIndex].Destinations[dIndex].LinkedRollCall).Time
}
if destinationGroupings[dgIndex].Destinations[dIndex].LinkedSeatsAvailable != nil {
tmpFlight.SeatCount = (*destinationGroupings[dgIndex].Destinations[dIndex].LinkedSeatsAvailable).Number
tmpFlight.SeatType = (*destinationGroupings[dgIndex].Destinations[dIndex].LinkedSeatsAvailable).Letter
}
finalFlights = append(finalFlights, tmpFlight)
}
}
/*
//Print flights list for photo
displayMessageForTerminal(slides[0].Terminal, fmt.Sprintf("%v Flights list for photo node %v", slides[0].FBNodeId))
for _, ff := range finalFlights {
fmt.Println(ff)
}
*/
//DEBUG Only update database if not DEBUG_MANUAL_IMAGE_FILE_TARGET true
if DEBUG_MANUAL_IMAGE_FILE_TARGET {
} else {
//Delete previous cancelled/duplicate flights for terminal for day from database
if err = deleteFlightsFromTableForDayForOriginTerminal(FLIGHTS_72HR_TABLE, slideDate, slides[0].Terminal); err != nil {
return
}
if err = insertFlightsIntoTable(FLIGHTS_72HR_TABLE, finalFlights); err != nil {
return
}
}
flightsFound = len(finalFlights)
incrementPhotosProcessed()
/*
//Debugging print slides array
log.Printf("len(saveTypes) %v", len(saveTypes))
log.Printf("len(slides) %v", len(slides))
for _, s := range slides {
log.Printf("slide type %v", s.saveType)
}
*/
return
}
//Request Photo node for Slide (info from Photo edge).
func getPhotoNodeForSlide(sReference Slide) (photoNode PhotoNode, err error) {
//Create request url and parameters
apiUrl := GRAPH_API_URL
resource := fmt.Sprintf("%v/%v", GRAPH_API_VERSION, sReference.FBNodeId)
data := url.Values{}
data.Add(GRAPH_FIELDS_KEY, GRAPH_FIELD_IMAGES_KEY)
data.Add(GRAPH_ACCESS_TOKEN_KEY, GRAPH_ACCESS_TOKEN)
u, _ := url.ParseRequestURI(apiUrl)
u.Path = resource
urlStr := fmt.Sprintf("%v?%v", u, data.Encode())
//Create request
var req *http.Request
var client *http.Client
client = &http.Client{
Timeout: time.Second * 20}
if req, err = http.NewRequest("GET", urlStr, nil); err != nil {
return
}
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
req.Header.Add("Content-Length", strconv.Itoa(len(data.Encode())))
//Make request
var resp *http.Response
if resp, err = client.Do(req); err != nil {
return
}
//Read response body into []byte
defer resp.Body.Close()
var body []byte
if body, err = ioutil.ReadAll(resp.Body); err != nil {
return
}
//Unmarshall into struct
if err = json.Unmarshal(body, &photoNode); err != nil {
return
}
//Check for error
if photoNode.Error.Code != 0 {
err = fmt.Errorf("Code %v\nMessage %v", photoNode.Error.Code, photoNode.Error.Message)
return
}
return
}
//Download first image for Photo node to IMAGE_TMP_DIRECTORY and Save in location for Slide.
//Sets Extension for Slide based on http.DetectContentType()
func downloadAndSaveImageForPhotoNode(photoNode PhotoNode, sReference *Slide) (err error) {
if len(photoNode.Images) == 0 {
err = errors.New(fmt.Sprintf("PhotoNode %v %v has no images.", (*sReference).Terminal.Title, (*sReference).FBNodeId))
return
}
//Create tmp directory if needed
var exist bool
if exist, err = exists(IMAGE_TMP_DIRECTORY); exist == false || err != nil {
if err != nil {
return
}
if err = os.Mkdir(IMAGE_TMP_DIRECTORY, os.ModePerm); err != nil {
return
}
return
}
//Create file handle to tmp photo path
tmpFilepath := fmt.Sprintf("%v/%v", IMAGE_TMP_DIRECTORY, (*sReference).FBNodeId)
var tmpFile *os.File
if tmpFile, err = os.Create(tmpFilepath); err != nil {
return
}
defer tmpFile.Close()
//Create request
var req *http.Request
var client *http.Client
client = &http.Client{
Timeout: time.Second * 20}
if req, err = http.NewRequest("GET", photoNode.Images[0].Source, nil); err != nil {
return
}
//Make request
var resp *http.Response
if resp, err = client.Do(req); err != nil {
return
}
//Read response body into os.File
defer resp.Body.Close()
if _, err = io.Copy(tmpFile, resp.Body); err != nil {
return
}
//Open tmp file for reading and read first 512 bytes for http.DetectContentType()
var fileHeader []byte
fileHeader = make([]byte, 512)
if tmpFile, err = os.Open(tmpFilepath); err != nil {
return
}
defer tmpFile.Close()
var length int
if length, err = tmpFile.Read(fileHeader); err != nil && err != io.EOF {
return
}
if length < len(fileHeader) {
fileHeader = fileHeader[:length]
}
var detectedContentType string
detectedContentType = http.DetectContentType(fileHeader)
if detectedContentType == "image/png" {
(*sReference).Extension = "png"
} else if detectedContentType == "image/jpeg" {
(*sReference).Extension = "jpeg"
} else if detectedContentType == "image/gif" {
(*sReference).Extension = "gif"
} else {
err = fmt.Errorf("Unhandled MIME type %v detected.", detectedContentType)
return
}
if err = copyFileContents(tmpFilepath, photoPath(*sReference)); err != nil {
return
}
return
}