102 lines
3.5 KiB
R
102 lines
3.5 KiB
R
# R/session.R
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#' Internal: open session, register views, cache manifest.
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#' Not exported. Called lazily by verbs via .ensure_session().
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#' @noRd
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cog_open <- function(url = .resolve_url(),
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cache_dir = .resolve_cache_dir()) {
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.check_url_configured(url)
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if (!dir.exists(cache_dir)) dir.create(cache_dir, recursive = TRUE)
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con <- DBI::dbConnect(duckdb::duckdb())
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DBI::dbExecute(con, "INSTALL httpfs; LOAD httpfs;")
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manifest <- .fetch_or_cache_manifest(url, cache_dir)
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.validate_schema(manifest, supported = c(4L, 5L, 6L, 7L))
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.validate_scope(manifest)
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.register_views(con, url, manifest)
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.uscogdata_env$con <- con
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.uscogdata_env$manifest <- manifest
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.uscogdata_env$url <- url
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.uscogdata_env$cache_dir <- cache_dir
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invisible(con)
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}
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#' @noRd
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.ensure_session <- function() {
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if (is.null(.uscogdata_env$con) ||
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!DBI::dbIsValid(.uscogdata_env$con)) {
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cog_open()
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}
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.uscogdata_env$con
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}
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# Coerce an input to a character vector of canonical_govid values.
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# Accepts either a character vector (returned as-is after `as.character`)
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# or a data.frame / tibble with a `canonical_govid` column (such as the
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# output of cog_gov_search() or cog_find_peers()) — in that case the
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# column is extracted so results from discovery verbs can pipe directly
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# into the query verbs.
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#' @noRd
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.coerce_govid_input <- function(x, arg = "govid") {
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if (is.data.frame(x)) {
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if (!"canonical_govid" %in% names(x)) {
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cli::cli_abort(c(
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"`{arg}` data frame must have a `canonical_govid` column.",
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i = "Use the result of cog_gov_search() or cog_find_peers() directly, or pass a character vector of canonical_govids."
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))
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}
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return(as.character(x$canonical_govid))
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}
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if (!is.character(x) && !is.numeric(x)) {
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cli::cli_abort(
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"`{arg}` must be a character vector or a data frame with a `canonical_govid` column."
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)
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}
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as.character(x)
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}
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# Check which of the supplied govids exist in canonical_fips_xwalk.
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# Emits a cli message listing any missing ones alongside a pointer to the
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# v0.1 scope explanation; returns both sets so callers can attach them to
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# provenance.
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#' @noRd
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.check_govids_in_scope <- function(govids) {
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govids <- unique(as.character(govids))
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if (length(govids) == 0L) return(list(found = character(0), missing = character(0)))
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con <- .ensure_session()
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sql <- sprintf(
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"SELECT canonical_govid FROM canonical_fips_xwalk WHERE canonical_govid IN (%s)",
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.sql_lit_chr(govids)
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)
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found <- DBI::dbGetQuery(con, sql)$canonical_govid
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missing <- setdiff(govids, found)
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if (length(missing) > 0L) {
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n <- length(missing)
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shown <- paste(utils::head(missing, 5L), collapse = ", ")
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more <- if (n > 5L) sprintf(" (+%d more)", n - 5L) else ""
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cli::cli_inform(c(
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i = sprintf("%d govid%s not found in v0.1 corpus: %s%s",
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n, if (n == 1L) "" else "s", shown, more),
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i = "Common causes: typo, pre-2017 PID that isn't bridged, or a scope-excluded type (4=special district, 5=school district).",
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i = "Resolve canonical names with cog_gov_search() first."
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))
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}
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list(found = found, missing = missing)
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}
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#' @noRd
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cog_close <- function() {
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if (!is.null(.uscogdata_env$con) && DBI::dbIsValid(.uscogdata_env$con)) {
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DBI::dbDisconnect(.uscogdata_env$con, shutdown = TRUE)
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}
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.uscogdata_env$con <- NULL
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.uscogdata_env$manifest <- NULL
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.uscogdata_env$balance_caveats_shown <- NULL
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# Memoised corpus-constant; a different corpus may be mounted next.
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.uscogdata_env$balance_coverage_windows <- NULL
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}
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