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CloudVision.gs
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CloudVision.gs
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/**
* used to do cloudvision queries
* @namespace Cloudvision
*/
var CloudVision = (function (ns) {
ns.params = {
endPoint:"https://vision.googleapis.com/v1/images:annotate",
maxFiles:10,
keyPrefix:'cv',
resultProperties:{
LABEL_DETECTION:'labelAnnotations',
FACE_DETECTION:'faceAnnotations'
}
};
/**
* try cache first of all
* @param {CacheService} cache
* @param {[object]} files the files to look at
* @param {string} keyPrefix any key prefix for cache
* @param {number} maxResults the max results
* @param {boolean} noCache whether to suppress cache
* @param {string} feature the feature
* @return [object] the result
*/
ns.tryCache = function (cache, files, keyPrefix,maxResults, noCache, feature) {
// generate the request list based on whether they are already in cache
return files.map (function (d) {
var cacheKey = cUseful.Utils.keyDigest (keyPrefix , d.id , maxResults , feature);
var cacheData = noCache ? '': cache.get (cacheKey);
// ensure we have the right thing
var data,
cachePackage = cacheData ? JSON.parse(cacheData) : null;
if (cachePackage) {
if (cachePackage.verify.id !== d.id) {
throw 'cache item ' + cacheKey + ' contained data for file id ' + cachePackage.verify.id + ' instead of ' + d.id;
}
// if file has been updated then this cache entryis no good
if (cachePackage.verify.digest === d.digest) {
data = cachePackage.data;
}
else {
cache.remove(cacheKey);
}
}
return {
cacheKey:cacheKey,
data:data,
file:d,
feature:feature
};
});
};
/**
* do a cloudvision query, but get it from cache if possible
* @param {string} accessToken the access token
* @param {string} folderId the folder id containing the images
* @param {string} type the feature detection
* @param {number} maxResults max results to get
* @param {boolean} [noCache] whether to skip using cache
* @return {[*]} an array of objects with the keys (cacheKey,data,file,requestIndex,feature) .. if requestindex = 0 it came from cache
*/
ns.query = function (accessToken, folderId , feature, maxResults,noCache) {
// get all the files
var files = ns.getFiles(accessToken, folderId);
if (!files.length) {
throw ('couldnt find any images in folder ' + folder.getName());
}
var cache = CacheService.getScriptCache();
// see what we can get from cache
var dataPackage = ns.tryCache ( cache , files, ns.params.keyPrefix, maxResults,noCache , feature);
// now generate requests for those that were not in cache
var requests = [];
dataPackage.forEach(function(d) {
if (!d.data) {
// generate a request package
requests.push({
features: [{
"type":d.feature,
"maxResults":maxResults
}],
image: {
content: d.file.b64
}
});
d.requestIndex = requests.length;
}
});
// if there were any requests, need to get them and mix in to cached
if (requests.length) {
// do the query
var response = cUseful.Utils.expBackoff ( function () {
return UrlFetchApp.fetch ( ns.params.endPoint, {
method: "POST",
payload: JSON.stringify({requests:requests}),
contentType: "application/json",
headers: {
Authorization:'Bearer ' + accessToken
}
});
});
// objectify the result
var result = JSON.parse(response.getContentText());
// write it to cache for next time & store the data in the datapackage
dataPackage.forEach(function(d) {
// should have a result
if (d.requestIndex) {
if (d.requestIndex > result.length) {
throw 'didnt get a result for request index ' + d.requestIndex;
}
var resultProperty = ns.params.resultProperties[d.feature];
if (!resultProperty) {
throw 'result property to use for ' + d.feature + ' is not defined'
}
d.data = result.responses[d.requestIndex-1][resultProperty];
// use a big expiration time
cache.put (d.cacheKey , JSON.stringify(
{data:d.data,
verify:{
digest:d.file.digest,
id:d.file.id,
}}), 60 * 60 * 4);
}
});
}
return dataPackage;
};
/**
* get all the image files to process and encode them
* even if result is in cache, we still need to get the image anyway
*@param {string} accessToken the access token
* @param {string} folderId the folder id containing the images
* @return {[*]} the files encoded
*/
ns.getFiles = function (accessToken, folderId) {
// get the folder
var folder = DriveApp.getFolderById(folderId);
if (!folder) {
throw 'cant find image folder ' + folderId;
}
// get all the files in the folder
var iterator = folder.searchFiles("mimeType contains 'image/'");
var files = [];
while (iterator.hasNext()) {
var file = iterator.next();
if (files.length >= ns.params.maxFiles) {
throw 'choose a smaller folder - max files allowed is ' + ns.params.maxFiles;
}
var b64 = Utilities.base64Encode(file.getBlob().getBytes());
files.push({
fileName:file.getName(),
b64:b64,
type:file.getMimeType(),
id:file.getId(),
digest:cUseful.Utils.keyDigest(b64)
});
}
return files;
};
return ns;
}) (CloudVision || {});