I want to be able to see if a specific key exists in a .yml file so I don't write the same key multiple times in the same file. Here's how it looks right now:
if (config.getString("coins","") == "") {
p.sendMessage("no coins key ):");
} else {
p.sendMessage("a coins key :D");
}
config.getString("path", "")
returns "", if the path does not exist. You should be good by checking it like that, but you should use .equals() to compare 2 strings.
Related
I am trying to make the primary key of my dynamodb table something like user_uuid. The user is being created in AWS Cognito and I can't seem to find a uuid like field as part of the CognitoUser class. I am trying to avoid using the username as the pk.
Can someone guide me to the right solution? I can't seem to find anything on the internet regarding a user_uuid field and for some reason I can't even find the documentation of CognitoUser class that is imported from "amazon-cognito-identity-js";
Depends if you plan to use email or phone as a 'username'. In that case, I would use the sub because it never changes. But, the sub is not k-sortable so that requires the use of an extra DB item and index/join to make users sortable by date added. If you plan to generate your GUID/KSUID, and only use email/phone as an alias, then I would use the 'username' as a common id between your DB and userpool.
Good luck with your project!
FWIW - the KSUID generators found in wild are massively overbuilt. 3000+ lines of code and 80+ dependencies. I made my own k-sortable and prefixed pseudo-random ID gen for Cognito users. Here's the code.
export function idGen(prefix: any) {
const validPrefix = [
'prefix1',
'prefix2'
];
//check if prefix argument is supplied
if (!prefix) {
return 'error! must supply prefix';
}
//check if value is a valid type
else if (validPrefix.indexOf(prefix) == -1) {
return 'error! prefix value supplied must be: ' + validPrefix;
} else {
// generate epoch time in seconds
const epoch = Math.round(Date.now() / 1000);
// convert epoch time to 6 character base36 string
const time = epoch.toString(36);
// generate 20 character base36 pseudo random string
const random =
Math.random().toString(36).substring(2, 12) +
Math.random().toString(36).substring(2, 12);
// combine prefix, strings, insert : divider and return id
return prefix + ':' + time + random;
}
}
Cognito user unique identifiers can be saved to a database using a combination of the "sub" value and the username, please refer to this question for a more lengthy discussion.
In the description of amazon-cognito-identity-js (found here, use case 5), they show how to get the userAttributes of a CognitoUser. One of the attributes is the sub value, which you can get at for example like this:
user.getUserAttributes(function(err, attributes) {
if (err) {
// Handle error
} else {
// Do something with attributes
const sub = attributes.find(obj => obj.Name === 'sub').Value;
}
});
I couldn't find any documentation on the available user attributes either, I recommend using the debugger to look at the user attributes returned from the function.
I'm trying to come up with a metric filter expression that filters CloudWatch Logs when a special JSON key attribute is present.
Use case is the following: the application does all kinds of logging(in JSON format) and whenever it has a special JSON key(nested JSON response from third-part service), I would like to filter it.
Example logs:
{"severity":"INFO","msg":"EVENT","event":{"key1":"value1"}}
{"severity":"INFO","msg":"FooService responded","response":{"response_code":800}}
Filter patterns that I've tried that don't work:
{ $.response }
{ $.response = *}
{ $.response = "*"}
{ $.response EXISTS }
{ $.response IS TRUE }
{ $.response NOT NULL }
{ $.response != NULL }
Expected filtering result:
{"severity":"INFO","msg":"FooService responded","response":{"response_code":800}}
{ $.response EXISTS } does the opposite of what I expect(returns the 1st line rather than then 2nd) but I'm not sure how to negate it.
Reference material: Filter and pattern syntax # CloudWatch User Guide
I haven't found a good solution.
But I did find one at least.
If you search for a key being != a specific value, it seems to do a null check on it.
So if you say:
{$.response != "something_no_one_should_have_ever_saved_this_response_as"}
Then you get all entries where response exists in your json, and where it's not your string (hopefully all of the valid entries)
Definitly not a clean solution, but it seems to be pretty functional
I don't have a solution to the task of finding records where a field exists. Indeed, the linked document in the question specifically calls this out as not supported.
but
If we simply reverse our logic this becomes a more tractable problem. Looking at your data, you want All records where there's a response key but that could also be stated as All records where there isn't an events key.
This means you could accomplish the task with {$.event NOT EXISTS}. Of course, this becomes more complicated the more types of log messages you get (I had to chain three different NOT EXISTS queries for my use case) but it does solve the problem.
I have to display some sentences on a screen.
However, the language can change if the user want to, so I do not want but I can do that :
if(language==1)
{
printf("Hello sir");
}
else if(language==2)
{
printf("Hola senor");
}
OR
printf("%s",language == 1 ? "Hello sir" : "Hola senor");
I do not want that because I have a lot of iterations.
Can I use map or enum and change it during code is running, I was thinking about a things like that :
#define MESSAGE_HELLO "Hello sir" OR "Hola senor"
printf("%s",MESSAGE_HELLO);
Do you have an idea ? Can you help me please ?
You can use some internationalization library that might help you. But here I will focus on how one can solve such a problem. Naturally, you need to have a set of languages, a set of message keys and a relationship between message keys and the languages, which would hold the actual message. Let's see some solutions:
Language file
You can store english.txt, etc. which would look like this:
hello_world="Hello World"
goodbye="Good bye"
and some other language, hungarian.txt for example:
hello_world="Heló Világ"
goodbye="Viszontlátásra"
etc.
Now, you can create an array of Map<String, Map<String, String>>, loop the languages, for each language process the corresponding file and fill the map accordingly.
Database
You can store a languages table, a message_keys table and a messages table. The messages table would have a foreign key pointing to languages and another one to message_keys and the actual message would be stored there as well. You could have an API that you could use in order to request items or groups of messages in a certain language.
There are many possible solutions.
In the professional world, I have often used tables (arrays) of phrases. Each slot in the array represents the phrase in another language.
static const char str_hello[] =
{
/* English */ "hello",
/* Spanish */ "hola",
/* German */ "guten tag",
//...
};
This has worked well in embedded systems.
You probably can create two maps for the sentences you want to translate - one map for one language - and then create a pointer to one of the maps. Then use pointer and [] to take sentences you need. Also, the pointer can be changed so that it points to another map at any moment.
Finally, I found a solution that fits with my requirements.
I use a .json file with all sentences and the languages I use.
{
"my-encoding": "UTF-8",
"messages": [
{
"MESS_HELLO": {
"english": "Hello",
"spanish": "Hola"
}
},
{
"MESS_GOODBYE": {
"english": "Bye",
"spanish": "Adios"
}
},
.......
]
}
To use .json file in C++, I included json-c lib in my project.
After loading the json file, I put it in a
std::unordered_map<std::string, std::unordered_map<std::string, std::string>> m_myTable;
With an ID declared in cpp (same as MESS_HELLO or MESS_GOODBYE).
It looks like that :
//"MESS_HELLO" -> { "english" -> "Hello" ; "spanish" -> "Hola" }
//"MESS_GOODBYE" -> { "english" -> "Bye" ; "other_language" -> "mess_in_other_language" ; +++ }
With that type I can do :
Easily add a new message by changing .json file + declaring in code a new ID
Modify the text by only change .json file
Add a new language by adding to .json file + adding several lines in code, but not a big deal.
To display it, I do something like
const auto &text_it = m_myTable.find("MESS_HELLO")
const auto &language_it = text_it->second.find("english");
printf("%s",language_it->second); //print Hello
Of course, it's in functions and well implemented, but I can't tell more about that.
I am a newbie in PowerBi and currently working on a POC where I need to load data from a folder or directory. Before this load, I need to check if
1) the respective folder exists
2) the file under the folder is with.csv extension.
Ex. Let suppose we have a file '/MyDoc2004/myAction.csv'.
Here first we need to check if MyDoc2004 exists and then if myAction file is with.csv extension.
Is there any way we can do this using Power Query?
1. Check if the folder exists
You can apply Folder.Contents function with the absolute path of the folder, and handle the error returned when the folder does not exist with try ... otherwise ... syntax.
let
absoluteFolderPath = "C:/folder/that/may/not/exist",
folderContentsOrError = Folder.Contents(absoluteFolderPath),
alternativeResult = """" & absoluteFolderPath & """ is not a valid folder path",
result = try folderContentsOrError otherwise alternativeResult
in
result
2. Check if the file is with .csv extension
I'm not sure what output you are expecting.
Here is a way to get the content of the file by full path including ".csv", or return an alternative result if not found.
let
absoluteFilePath = "C:/the/path/myAction.csv",
fileContentsOrError = File.Contents(absoluteFilePath),
alternativeResult = """" & absoluteFilePath & """ is not a valid file path",
result = try fileContentsOrError otherwise alternativeResult
in
result
If this is not what you are looking for, please update the question with the expected output.
Hope it helps.
I need to extract a file name from complete path and I see it strange that I when I split the path, I need to iterate through the list to get the file name. Why can't I just get the value simply by calling myList(3) as in DotNet, instead of having to instantiate an iterator, then loop through the records.
Here is my code;
List strlist=new List(Types::String);
strlist = strSplit(CompletePath, #"\");
After doing this I should have a list of all the different parts.
Is there any simple form to read the list, like FileName = strlist[2]; instead of having to do the below;
iterator = new ListIterator(strlist);
while(iterator.more())
{
FileName = iterator.value();
if (_Value == "myFile")
{
_NotFound=boolean::false;
}
Here again, if at that very moment, I don't know the file name, how do I check?
Global::fileNameSplit(fileName)
returns a container [path, file name, extension]
Should be used over the .NET methods recommended by Matej.
Use System.IO.Path::GetFileName(CompletePath) or System.IO.Path::GetFileNameWithoutExtension.