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use clap::Parser;
use epics_ca_rs::DbFieldType;
use epics_ca_rs::client::CaClient;
const VERSION_INFO: &str = concat!(
"\nEPICS Version epics-rs ",
env!("CARGO_PKG_VERSION"),
", CA Protocol version 4.13"
);
#[derive(Parser)]
#[command(
name = "cainfo-rs",
about = "Show EPICS PV channel information and client diagnostics",
disable_version_flag = true
)]
struct Args {
#[arg(short = 'V', long, hide = true)]
version: bool,
/// CA timeout in seconds. Mirrors C `tool_lib.c:use_ca_timeout_env`.
#[arg(short = 'w', long = "wait")]
timeout: Option<f64>,
/// `ca_client_status` interest level (0-10). Accepted for parity;
/// today the Rust client surfaces the equivalent diagnostics via
/// `--diag` instead.
#[arg(short = 's', long = "stat-level", value_name = "LEVEL")]
stat_level: Option<u8>,
/// CA priority (0-99). Accepted for parity.
#[arg(short = 'p', long)]
priority: Option<u8>,
/// Show client diagnostic counters and event history (Rust-only,
/// no C analogue).
#[arg(short = 'd', long)]
diag: bool,
/// PV names to query (omit for diagnostics only).
pv_names: Vec<String>,
}
#[tokio::main]
async fn main() {
let args = Args::parse();
if args.version {
println!("{VERSION_INFO}");
return;
}
if args.priority.is_some() {
eprintln!("cainfo-rs: -p (priority) is accepted for parity but not yet honoured");
}
if args.stat_level.is_some() {
eprintln!(
"cainfo-rs: -s (interest level) is accepted for parity; use --diag for the Rust client's diagnostics"
);
}
let client = CaClient::new().await.expect("failed to create CA client");
let timeout = epics_ca_rs::cli::timeout_duration(
args.timeout
.unwrap_or_else(epics_ca_rs::cli::env_default_timeout),
);
let mut failed = false;
for pv_name in &args.pv_names {
let ch = client.create_channel(pv_name);
match ch.wait_connected(timeout).await {
Ok(()) => match ch.info().await {
Ok(info) => {
// C `cainfo.c::printResult`: PV name on its own
// line, then five indented lines using a
// fixed-column key layout. Mirror it exactly so
// existing operator workflows that grep on
// `State:` / `Host:` etc. keep working.
let read_prefix = if info.access_rights.read { "" } else { "no " };
let write_prefix = if info.access_rights.write { "" } else { "no " };
println!(
"{name}\n \
State: connected\n \
Host: {host}\n \
Access: {rp}read, {wp}write\n \
Native data type: {dbf}\n \
Request type: {dbr}\n \
Element count: {n}",
name = info.pv_name,
host = info.server_addr,
rp = read_prefix,
wp = write_prefix,
dbf = dbf_name(info.native_type),
dbr = dbr_name(info.native_type),
n = info.element_count,
);
}
Err(e) => {
eprintln!("{pv_name}: {e}");
failed = true;
}
},
Err(_) => {
// C `cainfo` prints "never connected" on connect-fail
// (since `ca_state(chid)` returns the never-connected
// state when the search hasn't resolved). Mirror that
// shape — operators that pipe to grep / awk expect
// the same key prefixes regardless of state.
println!(
"{pv_name}\n \
State: never connected"
);
failed = true;
}
}
}
if args.diag || args.pv_names.is_empty() {
if !args.pv_names.is_empty() {
println!();
}
println!("--- Client Diagnostics ---");
println!("{}", client.diagnostics());
}
if failed {
std::process::exit(1);
}
}
/// `dbf_type_to_text` parity. Maps our native field type to the
/// `DBF_*` mnemonic the C tool prints.
fn dbf_name(t: DbFieldType) -> &'static str {
match t {
DbFieldType::String => "DBF_STRING",
DbFieldType::Short => "DBF_SHORT",
DbFieldType::Float => "DBF_FLOAT",
DbFieldType::Enum => "DBF_ENUM",
DbFieldType::Char => "DBF_CHAR",
DbFieldType::Long => "DBF_LONG",
DbFieldType::Double => "DBF_DOUBLE",
DbFieldType::Int64 => "DBF_INT64",
DbFieldType::UInt64 => "DBF_UINT64",
}
}
/// `dbr_type_to_text(dbf_type_to_DBR(t))` parity. The default request
/// type for a native DBF is the matching DBR.
fn dbr_name(t: DbFieldType) -> &'static str {
match t {
DbFieldType::String => "DBR_STRING",
DbFieldType::Short => "DBR_SHORT",
DbFieldType::Float => "DBR_FLOAT",
DbFieldType::Enum => "DBR_ENUM",
DbFieldType::Char => "DBR_CHAR",
DbFieldType::Long => "DBR_LONG",
DbFieldType::Double => "DBR_DOUBLE",
DbFieldType::Int64 => "DBR_DOUBLE", // Int64 has no CA wire type; appears as Double
DbFieldType::UInt64 => "DBR_DOUBLE", // UInt64 has no CA wire type; appears as Double
}
}