Last updated: 2024-07-17
Checks: 7 0
Knit directory: muse/
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| File | Version | Author | Date | Message |
|---|---|---|---|---|
| Rmd | d754f94 | Dave Tang | 2024-07-17 | Downloading files using the curl package |
The {curl} package provides:
The
curl()andcurl_download()functions provide highly configurable drop-in replacements for baseurl()anddownload.file()with better performance, support for encryption (https, ftps), gzip compression, authentication, and other ‘libcurl’ goodies. The core of the package implements a framework for performing fully customized requests where data can be processed either in memory, on disk, or streaming via the callback or connection interfaces. Some knowledge of ‘libcurl’ is recommended; for a more-user-friendly web client see the ‘httr’ package which builds on this package with http specific tools and logic.
Use multi_download() to download a relatively big file
(9 GB).
outdir <- 'data'
dir.create(outdir, showWarnings = FALSE)
library_file <- "seattle-library-checkouts.csv"
outfile <- paste0(outdir, '/', library_file)
if(!file.exists(outfile)){
curl::multi_download(
urls = "https://r4ds.s3.us-west-2.amazonaws.com/seattle-library-checkouts.csv",
destfiles = outfile,
resume = TRUE
)
}# A tibble: 1 × 10
success status_code resumefrom url destfile error type modified
<lgl> <int> <dbl> <chr> <chr> <chr> <chr> <dttm>
1 TRUE 200 0 https… data/se… <NA> text… 2022-12-04 19:29:58
# ℹ 2 more variables: time <dbl>, headers <list>File size.
file.size(outfile) |> utils:::format.object_size(units = 'Gb')[1] "8.6 Gb"
sessionInfo()R version 4.4.0 (2024-04-24)
Platform: x86_64-pc-linux-gnu
Running under: Ubuntu 22.04.4 LTS
Matrix products: default
BLAS: /usr/lib/x86_64-linux-gnu/openblas-pthread/libblas.so.3
LAPACK: /usr/lib/x86_64-linux-gnu/openblas-pthread/libopenblasp-r0.3.20.so; LAPACK version 3.10.0
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=en_US.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
time zone: Etc/UTC
tzcode source: system (glibc)
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] curl_5.2.1 workflowr_1.7.1
loaded via a namespace (and not attached):
[1] jsonlite_1.8.8 compiler_4.4.0 promises_1.3.0 Rcpp_1.0.12
[5] stringr_1.5.1 git2r_0.33.0 callr_3.7.6 later_1.3.2
[9] jquerylib_0.1.4 yaml_2.3.8 fastmap_1.2.0 R6_2.5.1
[13] knitr_1.46 tibble_3.2.1 rprojroot_2.0.4 bslib_0.7.0
[17] pillar_1.9.0 rlang_1.1.3 utf8_1.2.4 cachem_1.1.0
[21] stringi_1.8.4 httpuv_1.6.15 xfun_0.44 getPass_0.2-4
[25] fs_1.6.4 sass_0.4.9 cli_3.6.2 magrittr_2.0.3
[29] ps_1.7.6 digest_0.6.35 processx_3.8.4 rstudioapi_0.16.0
[33] lifecycle_1.0.4 vctrs_0.6.5 evaluate_0.23 glue_1.7.0
[37] whisker_0.4.1 fansi_1.0.6 rmarkdown_2.27 httr_1.4.7
[41] tools_4.4.0 pkgconfig_2.0.3 htmltools_0.5.8.1