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rstudio / shinyloadtest

Tools for load testing Shiny applications
https://rstudio.github.io/shinyloadtest
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`record_session` fails with error in `writeLines`: invalid connection #169

Open ppm1337 opened 2 days ago

ppm1337 commented 2 days ago

I am unable to successfully execute the shinyloadtest workflow. The recording.log from shinyloadtest::record_session seems to be fine despite an error but the subsequent report generation fails.

Running shinyloadtest::record_session("http://127.0.0.1:1234") produces the following output (mind the error in the end):

Listening on 127.0.0.1:8600 Navigating to: http://127.0.0.1:8600/ Browsing http://127.0.0.1:8600/ Client connected Client connected Client disconnected Stopping server Note: uploaded files to keep with recording file: recording.log.post.0 recording.log.post.1 recording.log.post.2 recording.log.post.3 recording.log.post.4 recording.log.post.5 recording.log.post.6 recording.log.post.7 Server disconnected Client disconnected Error in writeLines(format(evt), private$outputFile) : invalid connection later: exception occurred while executing callback: invoke_wrapped: throwing std::runtime_error

After manually adding the line{"type":"WS_CLOSE","begin":"2024-03-25T08:57:35.607Z"}, loading the runs goes through but with shinyloadtest::load_runs producing the following warnings:

Could not find a valid maintenance period. Make sure at least one complete iteration exists between the latest user st Setting the maintenance period to be whole run. Warning messages: 1: In readLines(recording_path) : incomplete final line found on '[...]' 2: In readLines(file_name) : incomplete final line found on '[...]' 3: In readLines(recording_path) : incomplete final line found on '[...]' 4: In readLines(recording_path) : incomplete final line found on '[...]'

Then, the report generation via shinyloadtest::shinyloadtest_report fails with:

async_extended_task_3-10_users - Concurrency Legend [=================================================>] 437/440 eta: 0sError: x must be a gtable

Here is the code that eventually lead to the error:

n_users <- c(3, 5, 10)
run_name <- "async_extended_task"

result <- do.call(
    shinyloadtest::load_runs,
    setNames(
        as.list(sprintf("<path_to_shinycannon_output>/%s_%s_users", run_name, n_users)),
        paste(n_users, "users")
    )
)

shinyloadtest::shinyloadtest_report(
    result, sprintf("%s_%s-%s_users.html", run_name, min(n_users), max(n_users)),
    self_contained = TRUE
)

The problem could probably be fixed by making sure that the session is successfully recorded but I can't get rid of the Error in writeLines(format(evt), private$outputFile) : invalid connection, which is odd because the output file is written and has contents. Any idea on how to resolve this?

session info:

  • Session info ---------------------------------------------------------------------------------------------------------- setting value version R version 4.3.2 (2023-10-31 ucrt) os Windows 10 x64 (build 19045)
    system x86_64, mingw32 ui RTerm language (EN) collate English_Belgium.1252 ctype English_Belgium.1252 tz Europe/Brussels date 2024-07-02 pandoc 3.1.9 @ (via rmarkdown)

  • Packages --------------------------------------------------------------------------------------------------------------
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