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ows.go
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ows.go
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package main
/* ows is a web server implementing the WMS, WCS and WPS protocols
to serve geospatial data. This server is intended to be
consumed directly by users and exposes a series of
functionalities through the GetCapabilities.xml document.
Configuration of the server is specified in the config.json
file where features such as layers or color scales can be
defined.
This server depends on two other services to operate: the
index server which registers the files involved in one operation
and the warp server which performs the actual rendering of
a tile. */
import (
"context"
"encoding/json"
"flag"
"fmt"
"io"
"io/ioutil"
"log"
"math"
"math/rand"
"net/http"
"net/url"
"os"
"path"
"path/filepath"
"regexp"
"runtime"
"strconv"
"strings"
"sync"
"time"
"github.com/nci/gomemcache/memcache"
"github.com/nci/gsky/metrics"
proc "github.com/nci/gsky/processor"
"github.com/nci/gsky/utils"
geo "github.com/nci/geometry"
)
// Global variable to hold the values specified
// on the config.json document.
var configMap *sync.Map
var mutex *sync.Mutex
var fileResolver *utils.RuntimeFileResolver
var builtinPalettes *utils.BuiltinPalettes
var mc *memcache.Client
var (
port = flag.Int("p", 8080, "Server listening port.")
serverDataDir = flag.String("data_dir", utils.DataDir, "Server data directory.")
serverConfigDir = flag.String("conf_dir", utils.EtcDir, "Server config directory.")
serverLogDir = flag.String("log_dir", "", "Server log directory.")
validateConfig = flag.Bool("check_conf", false, "Validate server config files.")
dumpConfig = flag.Bool("dump_conf", false, "Dump server config files.")
mcURI = flag.String("memcache", "", "memcache uri host:port")
verbose = flag.Bool("v", false, "Verbose mode for more server outputs.")
version = flag.Bool("version", false, "Get GSKY version")
)
var reWMSMap map[string]*regexp.Regexp
var reWCSMap map[string]*regexp.Regexp
var reWPSMap map[string]*regexp.Regexp
var (
Error *log.Logger
Info *log.Logger
)
var metricsLogger metrics.Logger
// init initialises the Error logger, checks
// required files are in place and sets Config struct.
// This is the first function to be called in main.
func init() {
rand.Seed(time.Now().UnixNano())
Error = log.New(os.Stderr, "OWS: ", log.Ldate|log.Ltime|log.Lshortfile)
Info = log.New(os.Stdout, "OWS: ", log.Ldate|log.Ltime|log.Lshortfile)
flag.Parse()
if *version {
fmt.Printf("%s\n", utils.GSKYVersion)
os.Exit(0)
}
utils.DataDir = *serverDataDir
utils.EtcDir = *serverConfigDir
fileResolver = utils.NewRuntimeFileResolver(utils.DataDir)
filePaths := []string{
"static/index.html",
"templates/WMS_GetCapabilities.tpl",
"templates/WMS_DescribeLayer.tpl",
"templates/WMS_ServiceException.tpl",
"templates/WPS_DescribeProcess.tpl",
"templates/WPS_Execute.tpl",
"templates/WPS_GetCapabilities.tpl",
"templates/WCS_GetCapabilities.tpl",
"templates/WCS_DescribeCoverage.tpl",
"zoom.png",
}
for _, filePath := range filePaths {
_, err := fileResolver.Lookup(filePath)
if err != nil {
panic(err)
}
}
http.DefaultTransport.(*http.Transport).MaxConnsPerHost = proc.DefaultMASMaxConnsPerHost
confMap, err := utils.LoadAllConfigFiles(utils.EtcDir, *verbose)
if err != nil {
Error.Printf("Error in loading config files: %v\n", err)
panic(err)
}
if *validateConfig {
os.Exit(0)
}
if *dumpConfig {
configJson, err := utils.DumpConfig(confMap)
if err != nil {
Error.Printf("Error in dumping configs: %v\n", err)
} else {
log.Print(configJson)
}
os.Exit(0)
}
if *mcURI != "" {
// lazy connection; errors returned in .Get
mc = memcache.New(*mcURI)
}
configMap = &sync.Map{}
configMap.Store("config", confMap)
utils.WatchConfig(Info, Error, configMap, *verbose)
mutex = &sync.Mutex{}
builtinPalettes = utils.NewBuiltinPalettes()
reWMSMap = utils.CompileWMSRegexMap()
reWCSMap = utils.CompileWCSRegexMap()
reWPSMap = utils.CompileWPSRegexMap()
utils.InitGdal()
if len(*serverLogDir) > 0 {
if *serverLogDir == "-" {
metricsLogger = metrics.NewStdoutLogger()
} else {
maxLogFileSize := int64(0)
if val, ok := os.LookupEnv("GSKY_MAX_LOG_FILE_SIZE"); ok {
valInt, e := strconv.ParseInt(val, 10, 64)
if e == nil {
maxLogFileSize = valInt
} else {
Error.Printf("invalid GSKY_MAX_LOG_FILE_SIZE: %v", e)
}
}
maxLogFiles := -1
if val, ok := os.LookupEnv("GSKY_MAX_LOG_FILES"); ok {
valInt, e := strconv.ParseInt(val, 10, 32)
if e == nil {
maxLogFiles = int(valInt)
} else {
Error.Printf("invalid GSKY_MAX_LOG_FILES: %v", e)
}
}
metricsLogger = metrics.NewFileLogger(*serverLogDir, maxLogFileSize, maxLogFiles, *verbose)
}
}
}
func serveWMS(ctx context.Context, params utils.WMSParams, conf *utils.Config, r *http.Request, w http.ResponseWriter, metricsCollector *metrics.MetricsCollector) {
if params.Request == nil {
metricsCollector.Info.HTTPStatus = 400
http.Error(w, "Malformed WMS, a Request field needs to be specified", 400)
return
}
reqURL := r.URL.String()
switch *params.Request {
case "GetCapabilities":
if params.Version != nil && !utils.CheckWMSVersion(*params.Version) {
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("This server can only accept WMS requests compliant with version 1.1.1 and 1.3.0: %s", reqURL), 400)
return
}
urlPath := strings.Trim(r.URL.Path, "/")
query := fmt.Sprintf("wms_getcaps_%s", urlPath)
gpath := utils.FindConfigGPath(conf)
owsCache := utils.NewOWSCache(conf.ServiceConfig.MASAddress, gpath, *verbose)
newConf, err := owsCache.GetConfig(query)
cacheMiss := false
if err != nil {
if *verbose {
log.Printf("WMS GetCapabilities get cache error: %v", err)
}
cacheMiss = true
} else if newConf == nil {
cacheMiss = true
} else if len(newConf.Layers) == 0 {
cacheMiss = true
}
if cacheMiss {
newConf = conf.Copy(r)
err = utils.LoadConfigTimestamps(newConf, *verbose)
if err != nil {
log.Printf("WMS GetCapabilities LoadConfigTimestamps error: %v", err)
}
}
tpl, _ := fileResolver.Lookup("templates/WMS_GetCapabilities.tpl")
err = utils.ExecuteWriteTemplateFile(w, newConf, tpl)
if err != nil {
metricsCollector.Info.HTTPStatus = 500
http.Error(w, err.Error(), 500)
}
if cacheMiss {
jsonBytes, mErr := json.Marshal(newConf)
if mErr == nil {
err = owsCache.Put(query, string(jsonBytes))
if err != nil {
if *verbose {
log.Printf("WMS GetCapabilities put cache error: %v", err)
}
}
} else {
log.Printf("json.Marshal failed for WMS GetCapabilities")
}
}
for iLayer := range conf.Layers {
if len(conf.Layers[iLayer].EffectiveStartDate) == 0 && len(newConf.Layers[iLayer].EffectiveStartDate) > 0 {
mutex.Lock()
conf.Layers[iLayer].EffectiveStartDate = newConf.Layers[iLayer].EffectiveStartDate
conf.Layers[iLayer].EffectiveEndDate = newConf.Layers[iLayer].EffectiveEndDate
mutex.Unlock()
}
}
case "GetFeatureInfo":
x, y, err := utils.GetCoordinates(params)
if err != nil {
Error.Printf("%s\n", err)
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("Malformed WMS GetFeatureInfo request: %v", err), 400)
return
}
if params.Time == nil {
idx, err := utils.GetLayerIndex(params, conf)
if err != nil {
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("Malformed getFeatureInfo request: %s", reqURL), 400)
return
}
currentTime, err := utils.GetCurrentTimeStamp(conf.Layers[idx].Dates)
if err != nil {
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("%v: %s", err, reqURL), 400)
return
}
params.Time = currentTime
}
var times []string
for _, axis := range params.Axes {
if axis.Name == utils.WeightedTimeAxis {
for _, val := range axis.InValues {
t := time.Unix(int64(val), 0).UTC().Format(utils.ISOFormat)
times = append(times, fmt.Sprintf(`"%s"`, t))
}
}
}
var timeStr string
if len(times) > 0 {
timeStr = fmt.Sprintf(`"times": [%s]`, strings.Join(times, ","))
} else {
timeStr = fmt.Sprintf(`"time": "%s"`, (*params.Time).Format(utils.ISOFormat))
}
feat_info, err := proc.GetFeatureInfo(ctx, params, conf, getConfigMap(), *verbose, metricsCollector)
if err != nil {
feat_info = fmt.Sprintf(`"error": "%v"`, err)
Error.Printf("%v\n", err)
}
resp := fmt.Sprintf(`{"type":"FeatureCollection","features":[{"type":"Feature","properties":{"x":%f, "y":%f, %s, %s}}]}`, x, y, timeStr, feat_info)
w.Write([]byte(resp))
case "DescribeLayer":
conf = conf.Copy(r)
idx, err := utils.GetLayerIndex(params, conf)
if err != nil {
Error.Printf("%s\n", err)
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("Malformed WMS DescribeLayer request: %v", err), 400)
return
}
tpl, _ := fileResolver.Lookup("templates/WMS_DescribeLayer.tpl")
err = utils.ExecuteWriteTemplateFile(w, conf.Layers[idx], tpl)
if err != nil {
metricsCollector.Info.HTTPStatus = 500
http.Error(w, err.Error(), 500)
}
case "GetMap":
var clipFeature *geo.Feature
if params.ClipFeature != nil {
feat, err := utils.ParamToGeoFeat(*params.ClipFeature, conf.WmsClipConfig, mc)
if err == nil {
clipFeature = feat
} else {
fmt.Println(err)
}
}
if params.Version == nil || !utils.CheckWMSVersion(*params.Version) {
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("This server can only accept WMS requests compliant with version 1.1.1 and 1.3.0: %s", reqURL), 400)
return
}
idx, err := utils.GetLayerIndex(params, conf)
if err != nil {
Error.Printf("%s\n", err)
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("Malformed WMS GetMap request: %v", err), 400)
return
}
if params.Time == nil {
currentTime, err := utils.GetCurrentTimeStamp(conf.Layers[idx].Dates)
if err != nil {
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("%v: %s", err, reqURL), 400)
return
}
params.Time = currentTime
}
if params.CRS == nil {
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("Request %s should contain a valid ISO 'crs/srs' parameter.", reqURL), 400)
return
}
if len(params.BBox) != 4 {
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("Request %s should contain a valid 'bbox' parameter.", reqURL), 400)
return
}
if params.Height == nil || params.Width == nil {
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("Request %s should contain valid 'width' and 'height' parameters.", reqURL), 400)
return
}
if strings.ToUpper(*params.CRS) == "EPSG:4326" && *params.Version == "1.3.0" {
params.BBox = []float64{params.BBox[1], params.BBox[0], params.BBox[3], params.BBox[2]}
}
if strings.ToUpper(*params.CRS) == "CRS:84" && *params.Version == "1.3.0" {
*params.CRS = "EPSG:4326"
}
var endTime *time.Time
if conf.Layers[idx].Accum == true {
step := time.Minute * time.Duration(60*24*conf.Layers[idx].StepDays+60*conf.Layers[idx].StepHours+conf.Layers[idx].StepMinutes)
eT := params.Time.Add(step)
endTime = &eT
}
if *params.Height > conf.Layers[idx].WmsMaxHeight || *params.Width > conf.Layers[idx].WmsMaxWidth {
http.Error(w, fmt.Sprintf("Requested width/height is too large, max width:%d, height:%d", conf.Layers[idx].WmsMaxWidth, conf.Layers[idx].WmsMaxHeight), 400)
return
}
styleIdx, err := utils.GetLayerStyleIndex(params, conf, idx)
if err != nil {
Error.Printf("%s\n", err)
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("Malformed WMS GetMap request: %v", err), 400)
return
}
styleLayer := &conf.Layers[idx]
if styleIdx >= 0 {
styleLayer = &conf.Layers[idx].Styles[styleIdx]
}
if utils.CheckDisableServices(styleLayer, "wms") {
Error.Printf("WMS GetMap is disabled for this layer")
metricsCollector.Info.HTTPStatus = 400
http.Error(w, "WMS GetMap is disabled for this layer", 400)
return
}
offset := styleLayer.OffsetValue
scale := styleLayer.ScaleValue
clip := styleLayer.ClipValue
if params.Offset != nil && params.Clip != nil {
offset = *params.Offset
clip = *params.Clip
scale = 0.0
}
palette := styleLayer.Palette
if params.Palette != nil {
palettes := styleLayer.Palettes
if len(palettes) == 0 {
palettes = builtinPalettes.Palettes
}
foundPalette := false
for _, p := range palettes {
if strings.ToLower(p.Name) == strings.ToLower(*params.Palette) {
palette = p
foundPalette = true
break
}
}
if !foundPalette {
msg := fmt.Sprintf("Requested palette not found: %s", *params.Palette)
Error.Printf(msg)
metricsCollector.Info.HTTPStatus = 400
http.Error(w, msg, 400)
return
}
}
colourScale := styleLayer.ColourScale
if params.ColourScale != nil {
colourScale = *params.ColourScale
}
bbox, err := utils.GetCanonicalBbox(*params.CRS, params.BBox)
if err != nil {
bbox = params.BBox
}
reqRes := utils.GetPixelResolution(bbox, *params.Width, *params.Height)
geoReq := &proc.GeoTileRequest{ConfigPayLoad: proc.ConfigPayLoad{NameSpaces: styleLayer.RGBExpressions.VarList,
BandExpr: styleLayer.RGBExpressions,
Mask: styleLayer.Mask,
Palette: palette,
ScaleParams: proc.ScaleParams{Offset: offset,
Scale: scale,
Clip: clip,
ColourScale: colourScale,
},
ZoomLimit: conf.Layers[idx].ZoomLimit,
PolygonSegments: conf.Layers[idx].WmsPolygonSegments,
GrpcConcLimit: conf.Layers[idx].GrpcWmsConcPerNode,
QueryLimit: -1,
UserSrcSRS: conf.Layers[idx].UserSrcSRS,
UserSrcGeoTransform: conf.Layers[idx].UserSrcGeoTransform,
AxisMapping: conf.Layers[idx].WmsAxisMapping,
GrpcTileXSize: conf.Layers[idx].GrpcTileXSize,
GrpcTileYSize: conf.Layers[idx].GrpcTileYSize,
IndexTileXSize: conf.Layers[idx].IndexTileXSize,
IndexTileYSize: conf.Layers[idx].IndexTileYSize,
SpatialExtent: conf.Layers[idx].SpatialExtent,
IndexResLimit: conf.Layers[idx].IndexResLimit,
MasQueryHint: conf.Layers[idx].MasQueryHint,
ReqRes: reqRes,
SRSCf: conf.Layers[idx].SRSCf,
MetricsCollector: metricsCollector,
},
Collection: styleLayer.DataSource,
CRS: *params.CRS,
BBox: params.BBox,
OrigBBox: params.BBox,
Height: *params.Height,
Width: *params.Width,
StartTime: params.Time,
EndTime: endTime,
ClipFeature: clipFeature,
}
if len(params.Axes) > 0 {
geoReq.Axes = make(map[string]*proc.GeoTileAxis)
for _, axis := range params.Axes {
geoReq.Axes[axis.Name] = &proc.GeoTileAxis{Start: axis.Start, End: axis.End, InValues: axis.InValues, Order: axis.Order, Aggregate: axis.Aggregate}
}
}
if params.BandExpr != nil {
if len(params.BandExpr.Expressions) > 0 && len(params.BandExpr.Expressions) != 1 && len(params.BandExpr.Expressions) != 3 {
err = fmt.Errorf("Number of band expressions must be either 1 or 3 for WMS")
Error.Printf("%s\n", err)
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("Malformed WMS GetMap request: %v", err), 400)
return
}
err := utils.CheckBandExpressionsComplexity(params.BandExpr, conf.Layers[idx].WmsBandExpressionCriteria)
if err != nil {
Error.Printf("%s\n", err)
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("Malformed WMS GetMap request: %v", err), 400)
return
}
geoReq.ConfigPayLoad.NameSpaces = params.BandExpr.VarList
geoReq.ConfigPayLoad.BandExpr = params.BandExpr
}
ctx, ctxCancel := context.WithCancel(ctx)
defer ctxCancel()
errChan := make(chan error, 100)
timeoutCtx, timeoutCancel := context.WithTimeout(context.Background(), time.Duration(conf.Layers[idx].WmsTimeout)*time.Second)
defer timeoutCancel()
tp := proc.InitTilePipeline(ctx, styleLayer.MASAddress, conf.ServiceConfig.WorkerNodes, conf.Layers[idx].MaxGrpcRecvMsgSize, conf.Layers[idx].WmsPolygonShardConcLimit, conf.ServiceConfig.MaxGrpcBufferSize, errChan)
tp.CurrentLayer = styleLayer
tp.DataSources = getConfigMap()
hasOverview := len(styleLayer.Overviews) > 0
if hasOverview {
allowExtrapolation := styleLayer.ZoomLimit > 0
iOvr := utils.FindLayerBestOverview(styleLayer, reqRes, allowExtrapolation)
if iOvr >= 0 {
geoReq.Overview = &styleLayer.Overviews[iOvr]
}
}
if !hasOverview && styleLayer.ZoomLimit != 0.0 && reqRes > styleLayer.ZoomLimit {
hasData := tp.HasFiles(geoReq, *verbose)
if hasData {
zoomFile, _ := fileResolver.Lookup("zoom.png")
out, err := utils.GetEmptyTile(zoomFile, *params.Height, *params.Width)
if err != nil {
Info.Printf("Error in the utils.GetEmptyTile(zoom.png): %v\n", err)
metricsCollector.Info.HTTPStatus = 500
http.Error(w, err.Error(), 500)
return
}
w.Write(out)
} else {
out, err := utils.GetEmptyTile("", *params.Height, *params.Width)
if err != nil {
Info.Printf("Error in the utils.GetEmptyTile(): %v\n", err)
metricsCollector.Info.HTTPStatus = 500
http.Error(w, err.Error(), 500)
} else {
w.Write(out)
}
}
return
}
select {
case res := <-tp.Process(geoReq, *verbose):
scaleParams := utils.ScaleParams{Offset: geoReq.ScaleParams.Offset,
Scale: geoReq.ScaleParams.Scale,
Clip: geoReq.ScaleParams.Clip,
ColourScale: geoReq.ScaleParams.ColourScale,
}
norm, err := utils.Scale(res, scaleParams)
if err != nil {
Info.Printf("Error in the utils.Scale: %v\n", err)
metricsCollector.Info.HTTPStatus = 500
http.Error(w, err.Error(), 500)
return
}
if len(norm) == 0 || norm[0].Width == 0 || norm[0].Height == 0 {
out, err := utils.GetEmptyTile(conf.Layers[idx].NoDataLegendPath, *params.Height, *params.Width)
if err != nil {
Info.Printf("Error in the utils.GetEmptyTile(): %v\n", err)
metricsCollector.Info.HTTPStatus = 500
http.Error(w, err.Error(), 500)
} else {
w.Write(out)
}
return
}
out, err := utils.EncodePNG(norm, palette)
if err != nil {
Info.Printf("Error in the utils.EncodePNG: %v\n", err)
metricsCollector.Info.HTTPStatus = 500
http.Error(w, err.Error(), 500)
return
}
w.Write(out)
case err := <-errChan:
Info.Printf("Error in the pipeline: %v\n", err)
metricsCollector.Info.HTTPStatus = 500
http.Error(w, err.Error(), 500)
case <-ctx.Done():
Error.Printf("Context cancelled with message: %v\n", ctx.Err())
metricsCollector.Info.HTTPStatus = 500
http.Error(w, ctx.Err().Error(), 500)
case <-timeoutCtx.Done():
Error.Printf("WMS pipeline timed out, threshold:%v seconds", conf.Layers[idx].WmsTimeout)
metricsCollector.Info.HTTPStatus = 500
http.Error(w, "WMS request timed out", 500)
}
return
case "GetLegendGraphic":
idx, err := utils.GetLayerIndex(params, conf)
if err != nil {
Error.Printf("%s\n", err)
if len(params.Layers) > 0 {
tpl, _ := fileResolver.Lookup("templates/WMS_ServiceException.tpl")
utils.ExecuteWriteTemplateFile(w, params.Layers[0], tpl)
} else {
metricsCollector.Info.HTTPStatus = 400
http.Error(w, err.Error(), 400)
}
return
}
styleIdx, err := utils.GetLayerStyleIndex(params, conf, idx)
if err != nil {
Error.Printf("%s\n", err)
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("Malformed WMS GetMap request: %v", err), 400)
return
}
styleLayer := &conf.Layers[idx]
if styleIdx >= 0 {
styleLayer = &conf.Layers[idx].Styles[styleIdx]
}
b, err := ioutil.ReadFile(styleLayer.LegendPath)
if err != nil {
Error.Printf("Error reading legend image: %v, %v\n", styleLayer.LegendPath, err)
metricsCollector.Info.HTTPStatus = 500
http.Error(w, "Legend graphics not found", 500)
return
}
w.Write(b)
default:
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("%s not recognised.", *params.Request), 400)
}
}
func serveWCS(ctx context.Context, params utils.WCSParams, conf *utils.Config, r *http.Request, w http.ResponseWriter, query map[string][]string, metricsCollector *metrics.MetricsCollector) {
if params.Request == nil {
metricsCollector.Info.HTTPStatus = 400
http.Error(w, "Malformed WCS, a Request field needs to be specified", 400)
}
reqURL := r.URL.String()
switch *params.Request {
case "GetCapabilities":
if params.Version != nil && !utils.CheckWCSVersion(*params.Version) {
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("This server can only accept WCS requests compliant with version 1.0.0: %s", reqURL), 400)
return
}
newConf := conf.Copy(r)
for iLayer := range conf.Layers {
if len(conf.Layers[iLayer].EffectiveStartDate) == 0 {
newConf.GetLayerDates(iLayer, *verbose)
if len(newConf.Layers[iLayer].EffectiveStartDate) > 0 {
mutex.Lock()
conf.Layers[iLayer].EffectiveStartDate = newConf.Layers[iLayer].EffectiveStartDate
conf.Layers[iLayer].EffectiveEndDate = newConf.Layers[iLayer].EffectiveEndDate
mutex.Unlock()
}
}
}
tpl, _ := fileResolver.Lookup("templates/WCS_GetCapabilities.tpl")
err := utils.ExecuteWriteTemplateFile(w, &newConf, tpl)
if err != nil {
metricsCollector.Info.HTTPStatus = 500
http.Error(w, err.Error(), 500)
}
case "DescribeCoverage":
idx, err := utils.GetCoverageIndex(params, conf)
if err != nil {
Info.Printf("Error in the pipeline: %v\n", err)
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("Malformed WMS DescribeCoverage request: %v", err), 400)
return
}
newConf := conf.Copy(r)
newConf.GetLayerDates(idx, *verbose)
tpl, _ := fileResolver.Lookup("templates/WCS_DescribeCoverage.tpl")
err = utils.ExecuteWriteTemplateFile(w, newConf.Layers[idx], tpl)
if err != nil {
http.Error(w, err.Error(), 500)
}
case "GetCoverage":
if params.Version == nil || !utils.CheckWCSVersion(*params.Version) {
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("This server can only accept WCS requests compliant with version 1.0.0: %s", reqURL), 400)
return
}
idx, err := utils.GetCoverageIndex(params, conf)
if err != nil {
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("%v: %s", err, reqURL), 400)
return
}
if params.Time == nil {
currentTime, err := utils.GetCurrentTimeStamp(conf.Layers[idx].Dates)
if err != nil {
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("%v: %s", err, reqURL), 400)
return
}
params.Time = currentTime
}
if params.CRS == nil {
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("Request %s should contain a valid ISO 'crs/srs' parameter.", reqURL), 400)
return
}
if len(params.BBox) != 4 {
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("Request %s should contain a valid 'bbox' parameter.", reqURL), 400)
return
}
if params.Height == nil || params.Width == nil {
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("Request %s should contain valid 'width' and 'height' parameters.", reqURL), 400)
return
}
if params.Format == nil {
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("Unsupported encoding format"), 400)
return
}
var endTime *time.Time
if conf.Layers[idx].Accum == true {
step := time.Minute * time.Duration(60*24*conf.Layers[idx].StepDays+60*conf.Layers[idx].StepHours+conf.Layers[idx].StepMinutes)
eT := params.Time.Add(step)
endTime = &eT
}
styleIdx, err := utils.GetCoverageStyleIndex(params, conf, idx)
if err != nil {
Error.Printf("%s\n", err)
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("Malformed WCS GetCoverage request: %v", err), 400)
return
} else if styleIdx < 0 {
styleCount := len(conf.Layers[idx].Styles)
if styleCount > 1 && params.BandExpr == nil {
Error.Printf("WCS style not specified")
metricsCollector.Info.HTTPStatus = 400
http.Error(w, "WCS style not specified", 400)
return
} else if styleCount == 1 {
styleIdx = 0
}
}
styleLayer := &conf.Layers[idx]
if styleIdx >= 0 {
styleLayer = &conf.Layers[idx].Styles[styleIdx]
}
if utils.CheckDisableServices(styleLayer, "wcs") {
Error.Printf("WCS GetCoverage is disabled for this layer")
metricsCollector.Info.HTTPStatus = 400
http.Error(w, "WCS GetCoverage is disabled for this layer", 400)
return
}
if params.BandExpr != nil {
err := utils.CheckBandExpressionsComplexity(params.BandExpr, conf.Layers[idx].WcsBandExpressionCriteria)
if err != nil {
Error.Printf("%s\n", err)
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("Malformed WCS GetCoverage request: %v", err), 400)
return
}
}
maxXTileSize := conf.Layers[idx].WcsMaxTileWidth
maxYTileSize := conf.Layers[idx].WcsMaxTileHeight
checkpointThreshold := 300
minTilesPerWorker := 5
var wcsWorkerNodes []string
workerTileRequests := [][]*proc.GeoTileRequest{}
_, isWorker := query["wbbox"]
getGeoTileRequest := func(width int, height int, bbox []float64, offX int, offY int) *proc.GeoTileRequest {
geoReq := &proc.GeoTileRequest{ConfigPayLoad: proc.ConfigPayLoad{NameSpaces: styleLayer.RGBExpressions.VarList,
BandExpr: styleLayer.RGBExpressions,
Mask: styleLayer.Mask,
Palette: styleLayer.Palette,
ScaleParams: proc.ScaleParams{Offset: styleLayer.OffsetValue,
Scale: styleLayer.ScaleValue,
Clip: styleLayer.ClipValue,
},
ZoomLimit: 0.0,
PolygonSegments: conf.Layers[idx].WcsPolygonSegments,
GrpcConcLimit: conf.Layers[idx].GrpcWcsConcPerNode,
QueryLimit: -1,
UserSrcSRS: conf.Layers[idx].UserSrcSRS,
UserSrcGeoTransform: conf.Layers[idx].UserSrcGeoTransform,
NoReprojection: params.NoReprojection,
AxisMapping: params.AxisMapping,
GrpcTileXSize: conf.Layers[idx].GrpcTileXSize,
GrpcTileYSize: conf.Layers[idx].GrpcTileYSize,
IndexTileXSize: conf.Layers[idx].IndexTileXSize,
IndexTileYSize: conf.Layers[idx].IndexTileYSize,
SpatialExtent: conf.Layers[idx].SpatialExtent,
IndexResLimit: conf.Layers[idx].IndexResLimit,
MasQueryHint: conf.Layers[idx].MasQueryHint,
SRSCf: conf.Layers[idx].SRSCf,
FusionUnscale: 1,
MetricsCollector: metricsCollector,
},
Collection: styleLayer.DataSource,
CRS: *params.CRS,
BBox: bbox,
OrigBBox: params.BBox,
Height: height,
Width: width,
StartTime: params.Time,
EndTime: endTime,
OffX: offX,
OffY: offY,
}
if len(params.Axes) > 0 {
geoReq.Axes = make(map[string]*proc.GeoTileAxis)
for _, axis := range params.Axes {
geoReq.Axes[axis.Name] = &proc.GeoTileAxis{Start: axis.Start, End: axis.End, InValues: axis.InValues, Order: axis.Order, Aggregate: axis.Aggregate}
for _, sel := range axis.IdxSelectors {
tileIdxSel := &proc.GeoTileIdxSelector{Start: sel.Start, End: sel.End, Step: sel.Step, IsRange: sel.IsRange, IsAll: sel.IsAll}
geoReq.Axes[axis.Name].IdxSelectors = append(geoReq.Axes[axis.Name].IdxSelectors, tileIdxSel)
}
}
}
if params.BandExpr != nil {
geoReq.ConfigPayLoad.NameSpaces = params.BandExpr.VarList
geoReq.ConfigPayLoad.BandExpr = params.BandExpr
}
return geoReq
}
ctx, ctxCancel := context.WithCancel(ctx)
defer ctxCancel()
errChan := make(chan error, 100)
epsg, err := utils.ExtractEPSGCode(*params.CRS)
if err != nil {
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("Invalid CRS code %s", *params.CRS), 400)
return
}
if *params.Width <= 0 || *params.Height <= 0 {
if isWorker {
msg := "WCS: worker width or height negative"
Info.Printf(msg)
metricsCollector.Info.HTTPStatus = 500
http.Error(w, msg, 500)
return
}
geoReq := getGeoTileRequest(0, 0, params.BBox, 0, 0)
maxWidth, maxHeight, err := proc.ComputeReprojectionExtent(ctx, geoReq, conf.ServiceConfig.MASAddress, conf.ServiceConfig.WorkerNodes, epsg, params.BBox, *verbose)
if *verbose {
Info.Printf("WCS: Output image size: width=%v, height=%v", maxWidth, maxHeight)
}
if maxWidth > 0 && maxHeight > 0 {
*params.Width = maxWidth
*params.Height = maxHeight
rex := regexp.MustCompile(`(?i)&width\s*=\s*[-+]?[0-9]+`)
reqURL = rex.ReplaceAllString(reqURL, ``)
rex = regexp.MustCompile(`(?i)&height\s*=\s*[-+]?[0-9]+`)
reqURL = rex.ReplaceAllString(reqURL, ``)
reqURL += fmt.Sprintf("&width=%d&height=%d", maxWidth, maxHeight)
} else {
errMsg := "WCS: failed to compute output extent"
Info.Printf(errMsg, err)
metricsCollector.Info.HTTPStatus = 500
http.Error(w, errMsg, 500)
return
}
}
if *params.Height > conf.Layers[idx].WcsMaxHeight || *params.Width > conf.Layers[idx].WcsMaxWidth {
metricsCollector.Info.HTTPStatus = 400
http.Error(w, fmt.Sprintf("Requested width/height is too large, max width:%d, height:%d", conf.Layers[idx].WcsMaxWidth, conf.Layers[idx].WcsMaxHeight), 400)
return
}
if !isWorker {
if *params.Width > maxXTileSize || *params.Height > maxYTileSize {
tmpTileRequests := []*proc.GeoTileRequest{}
xRes := (params.BBox[2] - params.BBox[0]) / float64(*params.Width)
yRes := (params.BBox[3] - params.BBox[1]) / float64(*params.Height)
for y := 0; y < *params.Height; y += maxYTileSize {
for x := 0; x < *params.Width; x += maxXTileSize {
yMin := params.BBox[1] + float64(y)*yRes
yMax := math.Min(params.BBox[1]+float64(y+maxYTileSize)*yRes, params.BBox[3])
xMin := params.BBox[0] + float64(x)*xRes
xMax := math.Min(params.BBox[0]+float64(x+maxXTileSize)*xRes, params.BBox[2])
tileXSize := int(.5 + (xMax-xMin)/xRes)
tileYSize := int(.5 + (yMax-yMin)/yRes)
geoReq := getGeoTileRequest(tileXSize, tileYSize, []float64{xMin, yMin, xMax, yMax}, x, *params.Height-y-tileYSize)
tmpTileRequests = append(tmpTileRequests, geoReq)
}
}
for iw, worker := range conf.ServiceConfig.OWSClusterNodes {
parsedURL, err := url.Parse(worker)
if err != nil {
if *verbose {
Info.Printf("WCS: invalid worker hostname %v, (%v of %v)\n", worker, iw, len(conf.ServiceConfig.OWSClusterNodes))
}
continue
}
if parsedURL.Host == conf.ServiceConfig.OWSHostname {
if *verbose {
Info.Printf("WCS: skipping worker whose hostname == OWSHostName %v, (%v of %v)\n", worker, iw, len(conf.ServiceConfig.OWSClusterNodes))
}
continue
}
wcsWorkerNodes = append(wcsWorkerNodes, worker)
}
nWorkers := len(wcsWorkerNodes) + 1
tilesPerWorker := int(math.Round(float64(len(tmpTileRequests)) / float64(nWorkers)))
if tilesPerWorker < minTilesPerWorker {
tilesPerWorker = minTilesPerWorker
}
isLastWorker := false
for i := 0; i < nWorkers; i++ {
iBgn := i * tilesPerWorker
iEnd := iBgn + tilesPerWorker
if iEnd > len(tmpTileRequests) {
iEnd = len(tmpTileRequests)
isLastWorker = true
}
workerTileRequests = append(workerTileRequests, tmpTileRequests[iBgn:iEnd])
if isLastWorker {
break
}
}
} else {
geoReq := getGeoTileRequest(*params.Width, *params.Height, params.BBox, 0, 0)
workerTileRequests = append(workerTileRequests, []*proc.GeoTileRequest{geoReq})
}
} else {
for _, qParams := range []string{"wwidth", "wheight", "woffx", "woffy"} {
if len(query[qParams]) != len(query["wbbox"]) {