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import makeDebug from 'debug'
import _ from 'lodash'
import dot from 'dot-object'
import moment from 'moment'
import errors from '@feathersjs/errors'
import { Grid } from 'weacast-core'
const debug = makeDebug('weacast:weacast-probe:service')
const debugResults = makeDebug('weacast:weacast-probe:results')
const uComponentPrefix = 'u-'
const vComponentPrefix = 'v-'
function isDirectionElement (elementName) {
const isUComponentOfDirection = elementName.startsWith(uComponentPrefix) // e.g. 'u-wind'
const isVComponentOfDirection = elementName.startsWith(vComponentPrefix) // e.g. 'v-wind'
return (isUComponentOfDirection || isVComponentOfDirection)
}
function getElementPrefix (elementName) {
const isUComponentOfDirection = elementName.startsWith(uComponentPrefix) // e.g. 'u-wind'
const isVComponentOfDirection = elementName.startsWith(vComponentPrefix) // e.g. 'v-wind'
return isUComponentOfDirection ? uComponentPrefix : (isVComponentOfDirection ? vComponentPrefix : '') // e.g. 'u-' for u-wind'
}
function getElementSuffix (elementName) {
// e.g. will generate 'wind-1000' for 'u-wind-1000'/'v-wind-1000'
const suffix = elementName.replace(getElementPrefix(elementName), '')
const index = suffix.indexOf('-')
// e.g. will generate '-1000' for 'wind-1000'
return (index >= 0 ? suffix.substring(index) : '')
}
function getDirectionElement (elementName) {
// e.g. will generate 'wind' for 'u-wind'/'v-wind' or 'u-wind-1000'/'v-wind-1000'
return elementName.replace(getElementPrefix(elementName), '').replace(getElementSuffix(elementName), '')
}
export default {
// Update the given probe results (given as features)
async updateFeaturesInDatabase (features, probe, elementService, forecast) {
const { runTime, forecastTime } = forecast
// Get the service to store results in
let resultService = this.app.getService('probe-results')
let operations = []
const elementName = elementService.element.name
const propertyName = 'properties.' + elementName
const isComponentOfDirection = isDirectionElement(elementName)
const directionElement = getDirectionElement(elementName) // e.g. will generate 'wind' for 'u-wind'/'v-wind'
const suffix = getElementSuffix(elementName) // e.g. will generate '-1000' for 'u-wind-1000'/'v-wind-1000'
// e.g. will generate '-1000' for 'u-wind-1000'/'v-wind-1000'
const speedPropertyName = 'properties.' + directionElement + 'Speed' + suffix
const directionPropertyName = 'properties.' + directionElement + 'Direction' + suffix
const bearingPropertyName = 'properties.' + directionElement + 'BearingDirection' + suffix
// We don't use service level operations like update to avoid concurrency issues,
// eg see https://github.com/weacast/weacast-probe/issues/2.
// We also want good performances so we use a bulkWrite
for (let i = 0; i < features.length; i++) {
const feature = features[i]
// Check if something to store for the element
Eif (_.has(feature, propertyName)) {
let data = {
[propertyName]: _.get(feature, propertyName)
}
// Update derived direction values as well in this case
Eif (isComponentOfDirection) {
Eif (_.has(feature, speedPropertyName)) data[speedPropertyName] = _.get(feature, speedPropertyName)
Eif (_.has(feature, directionPropertyName)) data[directionPropertyName] = _.get(feature, directionPropertyName)
Iif (_.has(feature, bearingPropertyName)) data[bearingPropertyName] = _.get(feature, bearingPropertyName)
}
// Already stored in DB ?
Iif (feature._id) {
debugResults('Updating probe result for probe ' + feature.probeId + ' at ' + forecastTime.format() +
' on run ' + runTime.format(), feature)
// Because we will not go through service hooks in this case we have to format dates to basic object types manually
data.runTime = new Date(runTime.format())
// Call service hooks (DB update is skipped when bulk param is used)
await resultService.update(feature._id, data, { bulk: true })
// Create bulk operation for update
operations.push({
updateOne: {
filter: { _id: feature._id }, // In this case we query by ID for update
update: { $set: data } // and indicate we'd like to patch some fields
}
})
} else {
debugResults('Inserting probe result for probe ' + probe._id + ' at ' + forecastTime.format() +
' on run ' + runTime.format(), feature)
// The base feature to insert is the one without the computed elements
let baseFeature = _.omit(feature, Object.keys(data))
// Because we will not go through service hooks in this case we have to format dates to basic object types manually
Object.assign(baseFeature, {
runTime: new Date(runTime.format()),
forecastTime: new Date(forecastTime.format())
})
// MongoDB requires the dot notation here so we perform conversion
// Take care that ObjectIDs are not basic types so we remove it before
delete baseFeature.probeId
// The same for coordinates array
_.unset(baseFeature, 'geometry.coordinates')
baseFeature = dot.dot(baseFeature)
// And add it back after conversion
baseFeature.probeId = probe._id
baseFeature['geometry.coordinates'] = _.get(feature, 'geometry.coordinates')
// Create bulk operation for insert or update
let filter = { // In this case we query by forecastTime/runTime/probeId
runTime: new Date(runTime.format()),
forecastTime: new Date(forecastTime.format()),
probeId: probe._id
}
// And by feature unique ID, unify as array because unique Id can be obtained by combining multiple properties
let ids = probe.featureId
Iif (!Array.isArray(ids)) {
ids = [ids]
}
ids.forEach(id => {
filter[id] = _.get(feature, id)
})
// Call service hooks (DB update is skipped when bulk param is used)
await resultService.create(data, { bulk: true })
operations.push({
updateOne: {
filter,
upsert: true, // and indicate we'd like to create it if it does not already exist
update: {
$set: data, // and indicate we'd like to patch some fields if the probe already exists
$setOnInsert: baseFeature // and indicate we will use the whole feature data on creation
}
}
})
}
}
}
// Run DB updates
try {
let response = await resultService.Model.bulkWrite(operations)
logger.verbose(`Produced ${response.upsertedCount + response.modifiedCount} results (${response.upsertedCount} creates - ${response.modifiedCount} updates)
for probe ${probe._id} on element ${elementService.forecast.name + '/' + elementService.element.name}
at ${forecastTime.format()} for run ${runTime.format()}`)
Iif (response.hasWriteErrors()) response.getWriteErrors().forEach(error => console.log(error))
return features
} catch (error) {
console.log(error)
return []
}
},
pushTime (feature, timeName, elementName, time, value) {
// For each element we store the list of available times
const times = _.get(feature, timeName + '.' + elementName)
// Initialize
if (!times) _.set(feature, timeName + '.' + elementName, [time.format()])
else times.push(time.format())
// And we store associated value using a map to avoid any operation order-dependence
if (!_.isNil(value)) _.set(feature.properties, elementName + '.' + time.format(), value)
},
getValueAtTime (feature, elementName, time) {
return _.get(feature.properties, elementName + '.' + (moment.isMoment(time) ? time.format() : time))
},
// Update the given features, for given probe, with interpolated values according to given forecast grid, run/forecast time
async updateFeatures (features, probe, elementService, forecast) {
const { runTime, forecastTime, grid } = forecast
// Check if we have to manage a direction composed from two axis components
const elementName = elementService.element.name
const isComponentOfDirection = isDirectionElement(elementName)
const directionElement = getDirectionElement(elementName) // e.g. will generate 'wind' for 'u-wind'/'v-wind'
const suffix = getElementSuffix(elementName) // e.g. will generate '-1000' for 'u-wind-1000'/'v-wind-1000'
// e.g. will generate '-1000' for 'u-wind-1000'/'v-wind-1000'
const speedProperty = directionElement + 'Speed' + suffix
const directionProperty = directionElement + 'Direction' + suffix
// Check if a bearing property is given to compute direction relatively to
const bearingProperty = directionElement + 'BearingProperty'
const bearingPropertyName = probe.hasOwnProperty(bearingProperty) ? probe[bearingProperty] : undefined
const bearingDirectionProperty = directionElement + 'BearingDirection' + suffix
features.forEach(feature => {
// Check if we process on-demand probing for a time range
const isTimeRange = (feature.forecastTime && !moment.isMoment(feature.forecastTime))
if (probe._id) feature.probeId = probe._id
let value = grid.interpolate(feature.geometry.coordinates[0], feature.geometry.coordinates[1])
Eif (!_.isNil(value) && isFinite(value)) { // Prevent values outside grid bbox
// Store interpolated element value
if (isTimeRange) {
this.pushTime(feature, 'forecastTime', elementName, forecastTime, value)
this.pushTime(feature, 'runTime', elementName, runTime)
} else {
feature.forecastTime = forecastTime
feature.runTime = runTime
feature.properties[elementName] = value
}
// Update derived direction values as well in this case
Eif (isComponentOfDirection) {
let u, v
if (isTimeRange) {
u = this.getValueAtTime(feature, uComponentPrefix + directionElement + suffix, forecastTime)
v = this.getValueAtTime(feature, vComponentPrefix + directionElement + suffix, forecastTime)
} else {
u = feature.properties[uComponentPrefix + directionElement + suffix]
v = feature.properties[vComponentPrefix + directionElement + suffix]
}
// Only possible if both elements are already computed
if (!_.isNil(u) && !_.isNil(v) && isFinite(u) && isFinite(v)) {
// Compute direction expressed in meteorological convention, i.e. angle from which the flow comes
let norm = Math.sqrt(u * u + v * v)
let direction = 180.0 + Math.atan2(u, v) * 180.0 / Math.PI
// Then store it
// Check if we process on-demand probing for a time range
if (isTimeRange) {
this.pushTime(feature, 'forecastTime', speedProperty, forecastTime, norm)
this.pushTime(feature, 'runTime', speedProperty, runTime)
this.pushTime(feature, 'forecastTime', directionProperty, forecastTime, direction)
this.pushTime(feature, 'runTime', directionProperty, runTime)
} else {
// Forecast/run time already set on feature for previous element values
feature.properties[speedProperty] = norm
feature.properties[directionProperty] = direction
}
// Compute bearing relatively to a bearing property if given
Iif (bearingPropertyName) {
let bearing = _.toNumber(feature.properties[bearingPropertyName])
if (isFinite(bearing)) {
// Take care that bearing uses the geographical convention, i.e. angle toward which the element goes,
// we need to convert from meteorological convention, i.e. angle from which the flow comes
direction += 180
if (direction >= 360) direction -= 360
direction -= bearing
if (direction < 0) direction += 360
// Then store it
if (isTimeRange) {
this.pushTime(feature, 'forecastTime', bearingDirectionProperty, forecastTime, direction)
this.pushTime(feature, 'runTime', bearingDirectionProperty, runTime)
} else {
// Forecast/run time already set on feature for previous element values
feature.properties[bearingDirectionProperty] = direction
}
}
}
}
}
}
})
},
// Update the given features, for given probe, with interpolated values according to given forecast data, run/forecast time
// If forecast data are not given they are retrieved from the existing data in DB
async probeForecastTime (features, probe, elementService, forecast) {
const { _id, x, y, runTime, forecastTime, data } = forecast
// Retrieve forecast data if required
let forecastData = data
Eif (!forecastData) {
let query = {
$select: ['data']
}
debug('No forecast data provided for probe ' + (probe._id ? probe._id : 'on-demand') + ' on element ' + elementService.forecast.name + '/' + elementService.element.name +
' at ' + forecastTime.format() + ' on run ' + runTime.format() + ', querying existing one', query)
// If we have an ID we will use it, otherwise request by forecast time
Eif (_id) {
let response = await elementService.get(_id.toString(), { query })
forecastData = response.data
} else {
query.forecastTime = forecastTime
if (elementService.forecast.keepPastRuns || elementService.element.keepPastRuns) {
query.runTime = forecast.runTime
}
// Take care that we need tile ID for tiles
if (!_.isNil(x) && !_.isNil(y)) {
Object.assign(query, {
x,
y,
timeseries: false // Probe single time not timeseries
})
}
let response = await elementService.find({ query })
forecastData = (response.data.length > 0 ? response.data[0].data : null)
}
}
Iif (!forecastData) {
throw new Error('Cannot retrieve forecast data for probe ' + (probe._id ? probe._id : 'on-demand') + ' on element ' + elementService.forecast.name + '/' + elementService.element.name +
' at ' + forecastTime.format() + ' for run ' + runTime.format())
}
// Check if we process a tile or raw data
let grid
if (!_.isNil(x) && !_.isNil(y)) {
grid = new Grid({
bounds: forecast.bounds,
origin: forecast.origin,
size: forecast.size,
resolution: forecast.resolution,
data: forecastData
})
} else {
grid = new Grid({
bounds: elementService.forecast.bounds,
origin: elementService.forecast.origin,
size: elementService.forecast.size,
resolution: elementService.forecast.resolution,
data: forecastData
})
}
this.updateFeatures(features, probe, elementService, { runTime, forecastTime, grid })
},
async getResultsForProbe (probe, elementService, forecast) {
// Get the service to read results in
let resultService = this.app.getService('probe-results')
let query = {
forecastTime: forecast.forecastTime,
probeId: probe._id
}
Iif (elementService.forecast.keepPastRuns || elementService.element.keepPastRuns) {
query.runTime = forecast.runTime
}
let results = await resultService.find({
paginate: false,
query
})
return results
},
// Retrieve all element services required to update the given probe
getElementServicesForProbe (probe) {
// Retrieve target elements for all models or specified one
let services = this.app.getElementServices(probe.forecast)
services = services.filter(service => {
return probe.elements.reduce((contains, element) => contains || (service.name === probe.forecast + '/' + element), false)
})
return services
},
getRefreshCallbackName (probe) {
return 'refresh_probe_' + probe._id.toString()
},
// Register to updates on all element services required to update the given probe
registerForecastUpdates (probe) {
const refreshCallbackName = this.getRefreshCallbackName(probe)
// Retrieve target elements
let services = this.getElementServicesForProbe(probe)
services.forEach(service => {
const app = service.app
const forecastName = service.forecast.name
const elementName = service.element.name
// Callback to be called (if not already registered)
Eif (!service.hasOwnProperty(refreshCallbackName)) {
debug('No existing refresh callback for probe ' + probe._id.toString() + ' on element ' + forecastName + '/' + elementName + ', registering')
// Internal callback
let refreshCallback = async forecast => {
// Do not process tiles but only raw data
if (forecast.geometry) return
// Find probe results associated to this forecast data set
debug('Looking for existing results with probe ' + probe._id + ' for element ' + forecastName + '/' + elementName +
' at ' + forecast.forecastTime.format() + ' on run ' + forecast.runTime.format())
try {
let features = await this.getResultsForProbe(probe, service, forecast)
// Possible on first probing
Eif (features.length === 0) {
let result = await this.get(probe._id, { query: { $select: ['forecast', 'elements', 'features'] } })
features = result.features
}
logger.verbose('Probing forecast data for element ' + forecastName + '/' + elementName + ' at ' + forecast.forecastTime.format() + ' on run ' + forecast.runTime.format())
await this.probeForecastTime(features, probe, service, forecast)
await this.updateFeaturesInDatabase(features, probe, service, forecast)
// Send a message so that clients know there are new results, indeed for performance reasons standard events have been disabled on results
// Take care to not forward forecast data
delete forecast.data
this.emit('results', { probe, forecast })
} catch (error) {
logger.error(error.message)
}
}
// External callback
let syncRefreshCallback = async (forecast) => {
// Need to convert from string to in-memory date objects
forecast.runTime = moment.utc(forecast.runTime)
forecast.forecastTime = moment.utc(forecast.forecastTime)
// In this case we don't already have data in memory so it will be fetched
await service[refreshCallbackName](forecast)
}
// Register for forecast data updates when using internal event systems
service[refreshCallbackName] = refreshCallback
service.on('created', service[refreshCallbackName])
// Or external loaders if any
Iif (app.sync) {
app.sync.on(forecastName + '-' + elementName, syncRefreshCallback)
}
}
})
},
// Unregister from updates on all element services required to update the given probe
unregisterForecastUpdates (probe) {
const refreshCallbackName = this.getRefreshCallbackName(probe)
// Retrieve target elements
let services = this.getElementServicesForProbe(probe)
services.forEach(service => {
// Unregister for forecast data update
debug('Removing existing refresh callback for probe ' + probe._id.toString() + ' on element ' + service.forecast.name + '/' + service.element.name + ', registering')
service.removeListener('created', service[refreshCallbackName])
})
},
// Perform probing on the input features if any (on-demand probe), in this case the probing time(s) must be given
// Otherwise features are retrieved from the existing probe in DB, probing performed for each available forecast time,
// and result features updated back in DB (probing stream)
// This also registers the probe to perform updates on results when new forecast data are coming
async probe (probe, query = {}) {
const forecastTime = query.forecastTime
const isTimeRange = (forecastTime && (forecastTime.$lt || forecastTime.$lte || forecastTime.$gt || forecastTime.$gte))
const aggregate = _.get(query, 'aggregate', true)
const geometry = _.get(query, 'geometry.$geoIntersects.$geometry')
// If querying at a specific location automatically generate the GeoJSON feature
if (geometry) {
Object.assign(probe, {
type: 'FeatureCollection',
features: [{
type: 'Feature',
properties: {},
geometry
}]
})
}
Iif (!probe.type || probe.type !== 'FeatureCollection') {
throw new errors.BadRequest('Only GeoJSON FeatureCollection layers are supported to create probes')
}
Iif (!probe.forecast) {
throw new errors.BadRequest('Target forecast model not specified')
}
Iif (!probe.elements || probe.elements.length === 0) {
throw new errors.BadRequest('Target forecast element(s) not specified')
}
// Probe streaming request a unique feature ID
Iif (!forecastTime && !probe.featureId) {
throw new errors.BadRequest('Unique identifier for probe features not specified')
}
// Register for forecast data updates on probing streams
if (!forecastTime) {
this.registerForecastUpdates(probe)
} else {
// Retrieve target elements
let services = this.getElementServicesForProbe(probe)
debug('Probing following services for on-demand probe', services.map(service => service.name))
// When probing a location we use tiles, take care to use only single time tiles not aggregated if any
let forecastQuery = (geometry ? { timeseries: false } : {})
Object.assign(forecastQuery, _.omit(query, ['aggregate']))
debug('Probing query', forecastQuery)
// Then run all probes
try {
// Initialize features data
let features = probe.features
features.forEach(feature => {
// If we have a time range for on-demand probing tag features using an array
if (isTimeRange && !feature.forecastTime) feature.forecastTime = {}
// Take care to initialize properties holder if not given in input feature
Iif (!feature.properties) feature.properties = {}
})
for (let service of services) {
// Will get all available forecast times (probing stream) or selected one(s) (on-demand probe)
let forecasts = await service.find({ paginate: false, query: forecastQuery })
debug('Probing following forecasts for probe ' + (probe._id ? probe._id : 'on-demand '), forecasts)
for (let forecast of forecasts) {
// Ask to retrieve forecast data and perform probing
await this.probeForecastTime(features, probe, service, forecast)
}
}
} catch (error) {
logger.error(error.message)
}
}
if (forecastTime && isTimeRange) {
// If we do not aggregate and generate a separated feature per time
let features = {}
// Rearrange data so that we get ordered arrays indexed by element instead of maps
probe.features.forEach(feature => {
// Split data according to time if required
if (!aggregate) {
_.forOwn(feature.forecastTime, (times, element) => {
times.forEach((time, index) => {
const featureId = (Array.isArray(probe.featureId)
? probe.featureId.map(id => _.get(feature, id)).join('-')
: _.get(feature, probe.featureId))
let featuresForId = features[featureId]
let featureForTime
if (featuresForId) featureForTime = featuresForId[time]
if (!featureForTime) {
featureForTime = Object.assign({}, _.pick(feature, ['type', 'geometry']))
featureForTime.forecastTime = moment.utc(time)
featureForTime.runTime = moment.utc(feature.runTime[element][index])
featureForTime.properties = _.omit(feature.properties, probe.elements)
if (featuresForId) features[featureId][time] = featureForTime
else features[featureId] = { [time]: featureForTime }
}
featureForTime.properties[element] = this.getValueAtTime(feature, element, time)
})
})
} else {
// Create the arrays of ordered times
feature.forecastTime = _.mapValues(feature.forecastTime,
(times, element) => times.map(time => moment.utc(time)).sort((a, b) => a - b))
feature.runTime = _.mapValues(feature.runTime,
(times, element) => times.map(time => moment.utc(time)).sort((a, b) => a - b))
// Then build the associated array of interpolated values
let properties = {}
_.forOwn(feature.forecastTime, (times, element) => {
properties[element] = []
times.forEach(time => properties[element].push(this.getValueAtTime(feature, element, time)))
})
// Update feature
Object.assign(feature.properties, properties)
}
})
// If we do not aggregate update output with a separated feature per time
if (!aggregate) {
probe.features = []
_.forOwn(features, (times, id) => {
probe.features = probe.features.concat(_.values(times).sort((a, b) => a.forecastTime - b.forecastTime))
})
}
}
}
}
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