seer_core/bulk/

executor.rs

use std::sync::atomic::{AtomicUsize, Ordering};
use std::sync::Arc;
use std::time::Duration;

use futures::stream::{self, StreamExt};
use serde::{Deserialize, Serialize};
use tokio::sync::Mutex;
use tokio::time::{sleep_until, Instant as TokioInstant};
use tracing::{debug, info, instrument};

use crate::availability::{AvailabilityChecker, AvailabilityResult};
use crate::caa::CaaPolicy;
use crate::confusables::ConfusableReport;
use crate::dns::{DnsRecord, DnsResolver, PropagationChecker, PropagationResult, RecordType};
use crate::error::Result;
use crate::lookup::{LookupResult, SmartLookup};
use crate::posture::EmailPosture;
use crate::rdap::{RdapClient, RdapResponse};
use crate::ssl::{SslChecker, SslReport};
use crate::status::{StatusClient, StatusResponse};
use crate::whois::{WhoisClient, WhoisResponse};

pub type ProgressCallback = Box<dyn Fn(usize, usize, &str) + Send + Sync>;

/// Callback invoked with each [`BulkResult`] the moment it completes.
///
/// Results are delivered in completion order (matching the return-vec ordering
/// contract on [`BulkExecutor::execute`]), so a UI can stream rows as they
/// finish instead of waiting for the whole batch. The full vec is still
/// returned for callers that want it.
pub type ResultCallback = Box<dyn Fn(&BulkResult) + Send + Sync>;

/// A single operation to perform in a bulk execution batch.
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(tag = "type", rename_all = "snake_case")]
pub enum BulkOperation {
    Whois {
        domain: String,
    },
    Rdap {
        domain: String,
    },
    Dns {
        domain: String,
        record_type: RecordType,
    },
    Propagation {
        domain: String,
        record_type: RecordType,
    },
    Lookup {
        domain: String,
    },
    Status {
        domain: String,
    },
    Avail {
        domain: String,
    },
    Info {
        domain: String,
    },
    Ssl {
        domain: String,
    },
    /// Email/DNS security posture (SPF, DMARC, MTA-STS, BIMI, DANE).
    Posture {
        domain: String,
    },
    /// Registered look-alike (confusable) scan.
    ///
    /// EXPENSIVE relative to the other operations: each domain fans out its
    /// own candidate generation, a DNS presence pre-filter over every
    /// candidate, and a full smart lookup per surviving candidate. A batch of
    /// N domains therefore multiplies into N independent candidate scans —
    /// budget bulk sizes accordingly. The scans running at once share one
    /// scan's fan-out (the executor's concurrency divided among them), so the
    /// total in flight stays bounded instead of multiplying per row.
    Confusables {
        domain: String,
    },
    /// CAA (Certification Authority Authorization) policy lookup.
    Caa {
        domain: String,
    },
}

impl BulkOperation {
    /// Returns the domain this operation targets, regardless of variant.
    pub fn domain(&self) -> &str {
        match self {
            Self::Whois { domain }
            | Self::Rdap { domain }
            | Self::Dns { domain, .. }
            | Self::Propagation { domain, .. }
            | Self::Lookup { domain }
            | Self::Status { domain }
            | Self::Avail { domain }
            | Self::Info { domain }
            | Self::Ssl { domain }
            | Self::Posture { domain }
            | Self::Confusables { domain }
            | Self::Caa { domain } => domain,
        }
    }
}

/// The data returned from a bulk operation (varies by operation type).
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(tag = "result_type", content = "data", rename_all = "snake_case")]
pub enum BulkResultData {
    Whois(WhoisResponse),
    Rdap(Box<RdapResponse>),
    Dns(Vec<DnsRecord>),
    Propagation(PropagationResult),
    Lookup(LookupResult),
    Status(StatusResponse),
    Avail(AvailabilityResult),
    Info(crate::domain_info::DomainInfo),
    Ssl(SslReport),
    Posture(EmailPosture),
    Confusables(ConfusableReport),
    Caa(CaaPolicy),
}

/// Result of a single operation within a bulk execution.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BulkResult {
    pub operation: BulkOperation,
    pub success: bool,
    pub data: Option<BulkResultData>,
    pub error: Option<String>,
    pub duration_ms: u64,
}

/// Executes bulk operations concurrently with rate limiting.
#[derive(Debug, Clone)]
pub struct BulkExecutor {
    concurrency: usize,
    rate_limit_delay: Duration,
    whois_client: WhoisClient,
    rdap_client: RdapClient,
    dns_resolver: DnsResolver,
    propagation_checker: PropagationChecker,
    smart_lookup: SmartLookup,
    status_client: StatusClient,
    availability_checker: AvailabilityChecker,
    ssl_checker: SslChecker,
    /// Upstream nameserver for DNS operations (`None` = the resolver
    /// default), so `bulk dns` honors the config's `nameserver` like `dig`.
    nameserver: Option<String>,
}

impl Default for BulkExecutor {
    fn default() -> Self {
        Self::new()
    }
}

impl BulkExecutor {
    pub fn new() -> Self {
        Self {
            concurrency: 10,
            rate_limit_delay: Duration::from_millis(100),
            whois_client: WhoisClient::new(),
            rdap_client: RdapClient::new(),
            dns_resolver: DnsResolver::new(),
            propagation_checker: PropagationChecker::new(),
            smart_lookup: SmartLookup::new(),
            status_client: StatusClient::new(),
            availability_checker: AvailabilityChecker::new(),
            ssl_checker: SslChecker::new(),
            nameserver: None,
        }
    }

    /// Builds an executor honoring `~/.seer/config.toml` settings.
    ///
    /// Reads `bulk.concurrency` (clamped to 1–50) and `bulk.rate_limit_ms`
    /// for dispatch pacing, plus every per-protocol timeout
    /// (`timeouts.whois_secs` / `rdap_secs` / `dns_secs` / `http_secs`) for
    /// the internal sub-clients. The propagation checker deliberately keeps
    /// its own tuned timeouts (a fan-out to every server in its list has
    /// different latency characteristics than a single query).
    pub fn from_config(config: &crate::config::SeerConfig) -> Self {
        let mut executor = Self::new()
            .with_concurrency(config.bulk.concurrency)
            .with_rate_limit(config.bulk_rate_limit());
        executor.whois_client = WhoisClient::from_config(config);
        executor.rdap_client = RdapClient::from_config(config);
        executor.dns_resolver = DnsResolver::from_config(config);
        executor.smart_lookup = SmartLookup::from_config(config);
        executor.status_client = StatusClient::from_config(config);
        executor.availability_checker = AvailabilityChecker::from_config(config);
        executor.ssl_checker = SslChecker::from_config(config);
        executor.nameserver = config.nameserver.clone();
        executor
    }

    pub fn with_concurrency(mut self, concurrency: usize) -> Self {
        self.concurrency = concurrency.clamp(1, 50);
        self
    }

    pub fn with_rate_limit(mut self, delay: Duration) -> Self {
        self.rate_limit_delay = delay;
        self
    }

    #[instrument(skip(self, operations, progress), fields(count = operations.len(), concurrency = self.concurrency))]
    pub async fn execute(
        &self,
        operations: Vec<BulkOperation>,
        progress: Option<ProgressCallback>,
    ) -> Vec<BulkResult> {
        self.execute_inner(operations, progress, None).await
    }

    /// Like [`execute`](Self::execute), but also invokes `on_result` with each
    /// [`BulkResult`] as soon as it completes (completion order). Enables live
    /// streaming of rows to a UI while the batch is still running.
    pub async fn execute_streaming(
        &self,
        operations: Vec<BulkOperation>,
        on_result: ResultCallback,
    ) -> Vec<BulkResult> {
        self.execute_inner(operations, None, Some(on_result)).await
    }

    #[instrument(skip(self, operations, progress, on_result), fields(count = operations.len(), concurrency = self.concurrency))]
    async fn execute_inner(
        &self,
        operations: Vec<BulkOperation>,
        progress: Option<ProgressCallback>,
        on_result: Option<ResultCallback>,
    ) -> Vec<BulkResult> {
        let total = operations.len();
        let completed = Arc::new(AtomicUsize::new(0));

        info!("bulk operation started");
        debug!(
            total = total,
            concurrency = self.concurrency,
            "Starting bulk execution"
        );

        // Per-batch rate limiter. The naive `interval(...).tick().await` inside
        // a `Mutex` would hold the lock across the await, serializing all
        // dispatch through the lock at 1 / rate_limit_delay — exactly the
        // regression v0.26.7 tried to fix from the other direction.
        //
        // Instead each task locks briefly to *claim* its dispatch slot (the
        // next monotonically-increasing deadline at `rate_limit_delay`
        // spacing), then releases the lock and `sleep_until`s its assigned
        // slot. With concurrency=N and rate=D, N tasks can be sleeping
        // simultaneously on N distinct deadlines, and execution begins at
        // each task's deadline — so global dispatch rate is 1/D while up
        // to N tasks run their operation concurrently.
        let limiter = if self.rate_limit_delay.is_zero() {
            None
        } else {
            Some(Arc::new(SlotLimiter::new(self.rate_limit_delay)))
        };

        // Operations that can actually be in flight together.
        let parallel = self.concurrency.min(total);

        let results: Vec<BulkResult> = stream::iter(operations)
            .map(|op| {
                let completed = completed.clone();
                let progress = progress.as_ref();
                let on_result = on_result.as_ref();
                let limiter = limiter.clone();

                async move {
                    // Rate-limited dispatch: claim our slot quickly under the
                    // lock, then `sleep_until` outside the lock so multiple
                    // tasks can be sleeping in parallel on their own slots.
                    if let Some(limiter) = &limiter {
                        limiter.wait().await;
                    }

                    let start = std::time::Instant::now();
                    let result = self.run_op(&op, parallel).await;
                    let duration_ms = start.elapsed().as_millis() as u64;

                    let count = completed.fetch_add(1, Ordering::Relaxed) + 1;

                    if let Some(progress) = progress {
                        progress(count, total, op.domain());
                    }

                    let bulk_result = match result {
                        Ok(data) => BulkResult {
                            operation: op,
                            success: true,
                            data: Some(trim_result_data(data)),
                            error: None,
                            duration_ms,
                        },
                        Err(e) => {
                            debug!(error = %e, "Bulk operation failed");
                            BulkResult {
                                operation: op,
                                success: false,
                                data: None,
                                // Store the sanitized form for external return;
                                // full detail stays in the debug log above.
                                error: Some(e.sanitized_message()),
                                duration_ms,
                            }
                        }
                    };

                    // Stream the row to any subscriber before it is folded into
                    // the collected vec, so a UI sees results as they finish.
                    if let Some(on_result) = on_result {
                        on_result(&bulk_result);
                    }

                    bulk_result
                }
            })
            // CONTRACT (#61): results come back in COMPLETION order, not input
            // order (`buffer_unordered`). Consumers must re-key by
            // `BulkResult.operation` rather than rely on positional index; do
            // not assume `results[i]` corresponds to `operations[i]`.
            .buffer_unordered(self.concurrency)
            .collect()
            .await;

        let succeeded = results.iter().filter(|r| r.success).count();
        let failed = results.iter().filter(|r| !r.success).count();
        info!(
            total = total,
            succeeded = succeeded,
            failed = failed,
            "bulk operation completed"
        );

        results
    }

    /// Dispatches one operation to the matching sub-client; `parallel` is how
    /// many operations of the batch run at once.
    async fn run_op(&self, op: &BulkOperation, parallel: usize) -> Result<BulkResultData> {
        match op {
            BulkOperation::Whois { domain } => {
                let result = self.whois_client.lookup(domain).await?;
                Ok(BulkResultData::Whois(result))
            }
            BulkOperation::Rdap { domain } => {
                let result = self.rdap_client.lookup_domain(domain).await?;
                Ok(BulkResultData::Rdap(Box::new(result)))
            }
            BulkOperation::Dns {
                domain,
                record_type,
            } => {
                let result = self
                    .dns_resolver
                    .resolve(domain, *record_type, self.nameserver.as_deref())
                    .await?;
                Ok(BulkResultData::Dns(result))
            }
            BulkOperation::Propagation {
                domain,
                record_type,
            } => {
                let result = self.propagation_checker.check(domain, *record_type).await?;
                Ok(BulkResultData::Propagation(result))
            }
            BulkOperation::Lookup { domain } => {
                let result = self.smart_lookup.lookup(domain).await?;
                Ok(BulkResultData::Lookup(result))
            }
            BulkOperation::Status { domain } => {
                let result = self.status_client.check(domain).await?;
                Ok(BulkResultData::Status(result))
            }
            BulkOperation::Avail { domain } => {
                let result = self.availability_checker.check(domain).await?;
                Ok(BulkResultData::Avail(result))
            }
            BulkOperation::Info { domain } => {
                let result = self.smart_lookup.lookup(domain).await?;
                Ok(BulkResultData::Info(
                    crate::domain_info::DomainInfo::from_lookup_result(&result),
                ))
            }
            BulkOperation::Ssl { domain } => {
                let result = self.ssl_checker.check(domain).await?;
                Ok(BulkResultData::Ssl(result))
            }
            BulkOperation::Posture { domain } => {
                let result = crate::posture::lookup_email_posture(
                    &self.dns_resolver,
                    domain,
                    self.nameserver.as_deref(),
                )
                .await?;
                Ok(BulkResultData::Posture(result))
            }
            BulkOperation::Confusables { domain } => {
                // The single-domain command fans out to `bulk.concurrency`;
                // here the concurrent scans split that budget, so a batch
                // does not nest it (50 rows × 50 lookups).
                let result = crate::confusables::find_confusables_shared(
                    &self.smart_lookup,
                    domain,
                    self.concurrency,
                    parallel,
                )
                .await?;
                Ok(BulkResultData::Confusables(result))
            }
            BulkOperation::Caa { domain } => {
                // Only invalid input errors (a per-row error); resolver
                // errors yield an empty policy.
                let policy =
                    crate::caa::lookup_caa(&self.dns_resolver, domain, self.nameserver.as_deref())
                        .await?;
                Ok(BulkResultData::Caa(policy))
            }
        }
    }

    /// Runs one operation per domain, built by `op` — shorthand for mapping a
    /// domain list into [`BulkOperation`]s and calling
    /// [`execute`](Self::execute) without a progress callback:
    ///
    /// ```no_run
    /// # async fn demo(executor: &seer_core::bulk::BulkExecutor) {
    /// use seer_core::bulk::BulkOperation;
    /// use seer_core::dns::RecordType;
    ///
    /// let domains = vec!["example.com".to_string()];
    /// let results = executor
    ///     .execute_each(domains, |domain| BulkOperation::Dns {
    ///         domain,
    ///         record_type: RecordType::MX,
    ///     })
    ///     .await;
    /// # }
    /// ```
    pub async fn execute_each(
        &self,
        domains: Vec<String>,
        op: impl FnMut(String) -> BulkOperation,
    ) -> Vec<BulkResult> {
        self.execute(domains.into_iter().map(op).collect(), None)
            .await
    }
}

/// Trims retained raw WHOIS bodies before a result enters the buffered vec.
///
/// `WhoisResponse.raw_response` is `#[serde(skip_serializing)]`, so no bulk
/// output path (JSON/YAML/CSV) ever emits it — the truncation is invisible
/// to consumers. Without it, each Whois/Lookup result can retain up to 1 MB
/// of raw body (the WHOIS client's response cap), which an adversarial batch
/// could inflate to ~1 GB at the CLI's 1000-domain cap.
fn trim_result_data(data: BulkResultData) -> BulkResultData {
    match data {
        BulkResultData::Whois(mut whois) => {
            crate::lookup::trim_whois_raw(&mut whois);
            BulkResultData::Whois(whois)
        }
        BulkResultData::Lookup(result) => {
            BulkResultData::Lookup(crate::lookup::trim_raw_response(result))
        }
        other => other,
    }
}

/// Spaces dispatches `delay` apart without serializing them.
///
/// Each caller locks only long enough to *claim* the next free slot (a
/// monotonically increasing deadline), then sleeps until that slot with the
/// lock released — so many callers can wait on distinct slots at once, and
/// work that starts at a slot overlaps with later callers. Holding the lock
/// across the wait (the v0.26.7 regression) would serialize everything.
struct SlotLimiter {
    delay: Duration,
    next: Mutex<Option<TokioInstant>>,
}

impl SlotLimiter {
    fn new(delay: Duration) -> Self {
        Self {
            delay,
            next: Mutex::new(None),
        }
    }

    /// Waits for this caller's dispatch slot.
    async fn wait(&self) {
        let my_slot = {
            let mut next = self.next.lock().await;
            let now = TokioInstant::now();
            let slot = match *next {
                Some(prev) if prev > now => prev,
                _ => now,
            };
            *next = Some(slot + self.delay);
            slot
        };
        sleep_until(my_slot).await;
    }
}

/// Parses a plain-text or CSV domain list: one domain per line (the first
/// column of a CSV row, quotes stripped), `#` comments and blank lines
/// skipped. Entries without a dot are dropped, which also drops a CSV header
/// row (`domain,status`).
pub fn parse_domains_from_file(content: &str) -> Vec<String> {
    // A UTF-8 BOM (Excel's "CSV UTF-8" export) is not whitespace to
    // `str::trim`: it would hide a first-line `#` comment and leak invisibly
    // into the first domain.
    let content = content.strip_prefix('\u{FEFF}').unwrap_or(content);
    content
        .lines()
        .map(|line| line.trim())
        .filter(|line| !line.is_empty() && !line.starts_with('#'))
        .map(|line| {
            // Handle CSV format (take first column). Spreadsheet exports
            // quote fields (`"example.com","Alice"`); the quotes are CSV
            // syntax, not part of the domain.
            line.split(',')
                .next()
                .unwrap_or(line)
                .trim()
                .trim_matches('"')
                .trim()
                .to_string()
        })
        .filter(|domain| domain.contains('.'))
        .collect()
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_parse_domains_from_file() {
        let content = r#"
# This is a comment
example1.com
google2.com
  whitespace3.com
invalid
csv,format,example.org
"#;

        let domains = parse_domains_from_file(content);
        assert_eq!(domains.len(), 3);
        assert!(domains.contains(&"example1.com".to_string()));
        assert!(domains.contains(&"google2.com".to_string()));
        assert!(domains.contains(&"whitespace3.com".to_string()));
        // "invalid" and "csv" are filtered out because they don't contain a dot
    }

    #[test]
    fn parse_domains_handles_bom_and_quoted_csv_fields() {
        // Excel "CSV UTF-8" export: BOM, quoted fields, a comment first line.
        let content =
            "\u{FEFF}# domains for example.com\n\"example.com\",\"Alice\"\n\"test.org\"\n";
        assert_eq!(
            parse_domains_from_file(content),
            vec!["example.com", "test.org"]
        );
        // A BOM directly before the first domain must not leak into it.
        assert_eq!(
            parse_domains_from_file("\u{FEFF}example.com\n"),
            vec!["example.com"]
        );
    }

    #[test]
    fn from_config_carries_the_configured_nameserver() {
        let config = crate::config::SeerConfig {
            nameserver: Some("9.9.9.9".to_string()),
            ..Default::default()
        };
        assert_eq!(
            BulkExecutor::from_config(&config).nameserver.as_deref(),
            Some("9.9.9.9")
        );
        assert!(BulkExecutor::new().nameserver.is_none());
    }

    #[test]
    fn test_parse_domains_skip_bare_header() {
        // Bare-keyword header ("domain") is dropped by the dot filter.
        let content = "domain\nexample.com\n";
        let domains = parse_domains_from_file(content);
        assert_eq!(domains, vec!["example.com"]);
    }

    #[test]
    fn test_parse_domains_multi_column_csv_header_dropped() {
        // First column is a bare keyword → whole header row has no dot in col 1
        // and is dropped by the dot filter.
        let content = "domain,status\ngoogle.com,live\n";
        let domains = parse_domains_from_file(content);
        assert_eq!(domains, vec!["google.com"]);
        assert!(!domains.contains(&"domain".to_string()));
    }

    #[test]
    fn first_domain_with_no_digits_is_kept() {
        // Regression: previous heuristic dropped the first entry when it
        // had no ASCII digits, losing "google.com" / "amazon.com" / ...
        let input = "google.com\namazon.com\n";
        let result = parse_domains_from_file(input);
        assert_eq!(result, vec!["google.com", "amazon.com"]);
    }

    #[test]
    fn header_row_named_hostname_is_dropped() {
        let input = "hostname\nexample.com\n";
        let result = parse_domains_from_file(input);
        assert_eq!(result, vec!["example.com"]);
    }

    #[test]
    fn domain_dot_com_is_not_dropped_as_header() {
        // "domain.com" is a real domain, not a header, because it has a dot.
        let input = "domain.com\nexample.com\n";
        let result = parse_domains_from_file(input);
        assert_eq!(result, vec!["domain.com", "example.com"]);
    }

    #[test]
    fn bulk_operation_domain_returns_domain_for_every_variant() {
        let d = "example.com".to_string();
        let ops = vec![
            BulkOperation::Whois { domain: d.clone() },
            BulkOperation::Rdap { domain: d.clone() },
            BulkOperation::Dns {
                domain: d.clone(),
                record_type: RecordType::A,
            },
            BulkOperation::Propagation {
                domain: d.clone(),
                record_type: RecordType::A,
            },
            BulkOperation::Lookup { domain: d.clone() },
            BulkOperation::Status { domain: d.clone() },
            BulkOperation::Avail { domain: d.clone() },
            BulkOperation::Info { domain: d.clone() },
            BulkOperation::Ssl { domain: d.clone() },
            BulkOperation::Posture { domain: d.clone() },
            BulkOperation::Confusables { domain: d.clone() },
            BulkOperation::Caa { domain: d.clone() },
        ];
        for op in &ops {
            assert_eq!(op.domain(), "example.com", "variant {:?}", op);
        }
    }

    /// The serde tags on the new variants are part of the public bulk API
    /// (REST/MCP consumers match on `type` / `result_type`); pin them.
    #[test]
    fn new_bulk_variants_serialize_with_snake_case_tags() {
        let op = BulkOperation::Posture {
            domain: "example.com".to_string(),
        };
        let json = serde_json::to_string(&op).expect("serialize Posture op");
        assert!(json.contains(r#""type":"posture""#), "got: {json}");

        let op = BulkOperation::Confusables {
            domain: "example.com".to_string(),
        };
        let json = serde_json::to_string(&op).expect("serialize Confusables op");
        assert!(json.contains(r#""type":"confusables""#), "got: {json}");

        let op = BulkOperation::Caa {
            domain: "example.com".to_string(),
        };
        let json = serde_json::to_string(&op).expect("serialize Caa op");
        assert!(json.contains(r#""type":"caa""#), "got: {json}");

        let data = BulkResultData::Caa(CaaPolicy::empty());
        let json = serde_json::to_string(&data).expect("serialize Caa result");
        assert!(json.contains(r#""result_type":"caa""#), "got: {json}");
    }

    /// The three new arms must surface an invalid domain as a per-row failure
    /// (success=false, sanitized error) instead of panicking or hanging.
    /// Fully offline: normalization rejects the input before any I/O.
    #[tokio::test]
    async fn new_bulk_arms_fail_cleanly_on_invalid_domain() {
        let executor = BulkExecutor::new().with_rate_limit(Duration::ZERO);
        let bad = || "not a domain".to_string();

        for (name, op) in [
            ("posture", BulkOperation::Posture { domain: bad() }),
            ("confusables", BulkOperation::Confusables { domain: bad() }),
            ("caa", BulkOperation::Caa { domain: bad() }),
        ] {
            let results = executor.execute(vec![op], None).await;
            assert_eq!(results.len(), 1, "{name}: expected one result");
            let r = &results[0];
            assert!(!r.success, "{name}: expected failure for invalid domain");
            assert!(r.data.is_none(), "{name}: expected no data on failure");
            let err = r.error.as_deref().unwrap_or("");
            assert!(!err.is_empty(), "{name}: expected non-empty error");
            assert_eq!(r.operation.domain(), "not a domain", "{name}");
        }
    }

    /// `from_config` must apply bulk pacing settings and clamp concurrency
    /// through the same builder path as manual construction.
    #[test]
    fn from_config_applies_bulk_settings() {
        let mut config = crate::config::SeerConfig::default();
        config.bulk.concurrency = 25;
        config.bulk.rate_limit_ms = 250;

        let executor = BulkExecutor::from_config(&config);
        assert_eq!(executor.concurrency, 25);
        assert_eq!(executor.rate_limit_delay, Duration::from_millis(250));

        // Out-of-range concurrency is clamped by the builder (defense in
        // depth on top of SeerConfig::load's own clamping).
        config.bulk.concurrency = 500;
        let executor = BulkExecutor::from_config(&config);
        assert_eq!(executor.concurrency, 50);
    }

    /// An oversized WHOIS raw_response must come out truncated when the
    /// result enters the buffer (`trim_result_data` runs on every Ok result
    /// in `execute_inner`). 32 KB cap + marker — see lookup::trim_whois_raw.
    #[test]
    fn bulk_whois_oversized_raw_response_is_truncated() {
        const MAX_RAW: usize = 32 * 1024;
        let raw = "a".repeat(MAX_RAW + 1000);
        let whois = WhoisResponse::parse("example.com", "whois.example.com", &raw);
        assert!(whois.raw_response.len() > MAX_RAW);

        let trimmed = trim_result_data(BulkResultData::Whois(whois));
        let BulkResultData::Whois(whois) = trimmed else {
            panic!("expected Whois variant");
        };
        assert!(
            whois.raw_response.len() <= MAX_RAW + "\n... [truncated]".len(),
            "raw_response not bounded: {} bytes",
            whois.raw_response.len()
        );
        assert!(whois.raw_response.ends_with("[truncated]"));
    }

    #[test]
    fn bulk_lookup_oversized_raw_response_is_truncated() {
        const MAX_RAW: usize = 32 * 1024;
        let raw = "a".repeat(MAX_RAW + 1000);
        let whois = WhoisResponse::parse("example.com", "whois.example.com", &raw);

        let trimmed = trim_result_data(BulkResultData::Lookup(LookupResult::Whois {
            data: whois,
            rdap_error: None,
            rdap_fallback: None,
            dns_nameservers: None,
        }));
        let BulkResultData::Lookup(LookupResult::Whois { data, .. }) = trimmed else {
            panic!("expected Lookup(Whois) variant");
        };
        assert!(data.raw_response.len() <= MAX_RAW + "\n... [truncated]".len());
        assert!(data.raw_response.ends_with("[truncated]"));
    }

    /// Regression test for the v0.26.7 rate-limiter regression, which held
    /// the lock across the wait and so serialized dispatch behind it.
    ///
    /// Runs on tokio's paused clock with a controlled 500ms "operation" after
    /// each slot, so the timing is exact rather than depending on how fast a
    /// real lookup happens to fail: 4 callers at 50ms spacing must finish at
    /// 150ms (last slot) + 500ms (its op) = 650ms. Any serialization of the
    /// callers pushes that to at least 4 × 500ms.
    #[tokio::test(start_paused = true)]
    async fn rate_limiter_dispatches_in_parallel_not_serialized() {
        let limiter = Arc::new(SlotLimiter::new(Duration::from_millis(50)));
        let start = TokioInstant::now();
        let slots: Vec<Duration> = stream::iter(0..4)
            .map(|_| {
                let limiter = limiter.clone();
                async move {
                    limiter.wait().await;
                    let slot = start.elapsed();
                    tokio::time::sleep(Duration::from_millis(500)).await;
                    slot
                }
            })
            .buffer_unordered(4)
            .collect()
            .await;
        let elapsed = start.elapsed();

        let mut slots = slots;
        slots.sort();
        assert_eq!(
            slots,
            [0, 50, 100, 150].map(Duration::from_millis),
            "dispatches must be spaced exactly one delay apart"
        );
        assert_eq!(
            elapsed,
            Duration::from_millis(650),
            "slow operations must overlap, not run one after another"
        );
    }

    #[tokio::test]
    async fn execute_ssl_failure_path_for_unresolvable_host() {
        // Verifies the SSL bulk arm wires correctly: an unresolvable hostname
        // must surface as success=false with a non-empty error string. Uses
        // the IETF-reserved `.invalid` TLD so this is hermetic.
        let executor = BulkExecutor::new().with_rate_limit(Duration::ZERO);
        let results = executor
            .execute_each(vec!["seer-bulk-ssl-test.invalid".to_string()], |domain| {
                BulkOperation::Ssl { domain }
            })
            .await;
        assert_eq!(results.len(), 1);
        let r = &results[0];
        assert!(!r.success, "expected failure, got success");
        assert!(r.data.is_none(), "expected no data on failure");
        let err = r.error.as_deref().unwrap_or("");
        assert!(!err.is_empty(), "expected non-empty error, got: {:?}", err);
        assert!(
            matches!(r.operation, BulkOperation::Ssl { ref domain } if domain == "seer-bulk-ssl-test.invalid"),
            "expected Ssl variant, got {:?}",
            r.operation
        );
    }

    #[tokio::test]
    async fn execute_streaming_invokes_callback_per_result() {
        use std::sync::atomic::AtomicUsize;
        // Hermetic: `.invalid` hosts fail fast at DNS. We only assert the
        // streaming contract — one callback per operation, and the callback
        // count equals the returned vec length.
        let executor = BulkExecutor::new().with_rate_limit(Duration::ZERO);
        let seen = Arc::new(AtomicUsize::new(0));
        let seen_cb = seen.clone();
        let cb: ResultCallback = Box::new(move |_r: &BulkResult| {
            seen_cb.fetch_add(1, Ordering::Relaxed);
        });
        let operations = vec![
            BulkOperation::Avail {
                domain: "seer-stream-1.invalid".to_string(),
            },
            BulkOperation::Avail {
                domain: "seer-stream-2.invalid".to_string(),
            },
            BulkOperation::Avail {
                domain: "seer-stream-3.invalid".to_string(),
            },
        ];
        let results = executor.execute_streaming(operations, cb).await;
        assert_eq!(results.len(), 3, "all operations should be returned");
        assert_eq!(
            seen.load(Ordering::Relaxed),
            3,
            "callback must fire exactly once per result"
        );
    }

    #[tokio::test]
    #[ignore = "live network: hits cloudflare.com:443; run with --ignored"]
    async fn execute_ssl_live_cloudflare_has_non_empty_chain() {
        let executor = BulkExecutor::new();
        let results = executor
            .execute_each(vec!["cloudflare.com".to_string()], |domain| {
                BulkOperation::Ssl { domain }
            })
            .await;
        assert_eq!(results.len(), 1);
        let r = &results[0];
        assert!(r.success, "expected success, got error: {:?}", r.error);
        let Some(BulkResultData::Ssl(ref report)) = r.data else {
            panic!("expected Ssl data, got {:?}", r.data);
        };
        assert!(!report.chain.is_empty(), "chain must not be empty");
        assert!(report.is_valid, "cloudflare leaf cert should be valid");
        assert!(
            report.days_until_expiry > 0,
            "cert should still be valid in the future, got {} days",
            report.days_until_expiry
        );
        assert!(
            !report.san_names.is_empty(),
            "cloudflare cert should have SAN entries"
        );
    }
}