Files
neon/safekeeper/src/http/routes.rs
Arpad Müller 5008324460 Fix utilization URL and ensure heartbeats work (#10811)
There was a typo in the name of the utilization endpoint URL, fix it.
Also, ensure that the heartbeat mechanism actually works.

Related: #10583, #10429

Part of #9011
2025-02-13 20:55:53 +00:00

707 lines
26 KiB
Rust

use http_utils::failpoints::failpoints_handler;
use hyper::{Body, Request, Response, StatusCode};
use safekeeper_api::models;
use safekeeper_api::models::AcceptorStateStatus;
use safekeeper_api::models::SafekeeperStatus;
use safekeeper_api::models::TermSwitchApiEntry;
use safekeeper_api::models::TimelineStatus;
use safekeeper_api::ServerInfo;
use std::collections::HashMap;
use std::fmt;
use std::io::Write as _;
use std::str::FromStr;
use std::sync::Arc;
use storage_broker::proto::SafekeeperTimelineInfo;
use storage_broker::proto::TenantTimelineId as ProtoTenantTimelineId;
use tokio::sync::mpsc;
use tokio::task;
use tokio_stream::wrappers::ReceiverStream;
use tokio_util::sync::CancellationToken;
use tracing::{info_span, Instrument};
use http_utils::endpoint::{
profile_cpu_handler, profile_heap_handler, prometheus_metrics_handler, request_span,
};
use http_utils::{
endpoint::{self, auth_middleware, check_permission_with, ChannelWriter},
error::ApiError,
json::{json_request, json_response},
request::{ensure_no_body, parse_query_param, parse_request_param},
RequestExt, RouterBuilder,
};
use postgres_ffi::WAL_SEGMENT_SIZE;
use safekeeper_api::models::{SkTimelineInfo, TimelineCopyRequest};
use safekeeper_api::models::{TimelineCreateRequest, TimelineTermBumpRequest};
use utils::{
auth::SwappableJwtAuth,
id::{TenantId, TenantTimelineId, TimelineId},
lsn::Lsn,
};
use crate::debug_dump::TimelineDigestRequest;
use crate::safekeeper::TermLsn;
use crate::timelines_global_map::TimelineDeleteForceResult;
use crate::GlobalTimelines;
use crate::SafeKeeperConf;
use crate::{copy_timeline, debug_dump, patch_control_file, pull_timeline};
/// Healthcheck handler.
async fn status_handler(request: Request<Body>) -> Result<Response<Body>, ApiError> {
check_permission(&request, None)?;
let conf = get_conf(&request);
let status = SafekeeperStatus { id: conf.my_id };
json_response(StatusCode::OK, status)
}
fn get_conf(request: &Request<Body>) -> &SafeKeeperConf {
request
.data::<Arc<SafeKeeperConf>>()
.expect("unknown state type")
.as_ref()
}
fn get_global_timelines(request: &Request<Body>) -> Arc<GlobalTimelines> {
request
.data::<Arc<GlobalTimelines>>()
.expect("unknown state type")
.clone()
}
fn check_permission(request: &Request<Body>, tenant_id: Option<TenantId>) -> Result<(), ApiError> {
check_permission_with(request, |claims| {
crate::auth::check_permission(claims, tenant_id)
})
}
/// Deactivates all timelines for the tenant and removes its data directory.
/// See `timeline_delete_handler`.
async fn tenant_delete_handler(mut request: Request<Body>) -> Result<Response<Body>, ApiError> {
let tenant_id = parse_request_param(&request, "tenant_id")?;
let only_local = parse_query_param(&request, "only_local")?.unwrap_or(false);
check_permission(&request, Some(tenant_id))?;
ensure_no_body(&mut request).await?;
let global_timelines = get_global_timelines(&request);
// FIXME: `delete_force_all_for_tenant` can return an error for multiple different reasons;
// Using an `InternalServerError` should be fixed when the types support it
let delete_info = global_timelines
.delete_force_all_for_tenant(&tenant_id, only_local)
.await
.map_err(ApiError::InternalServerError)?;
json_response(
StatusCode::OK,
delete_info
.iter()
.map(|(ttid, resp)| (format!("{}", ttid.timeline_id), *resp))
.collect::<HashMap<String, TimelineDeleteForceResult>>(),
)
}
async fn timeline_create_handler(mut request: Request<Body>) -> Result<Response<Body>, ApiError> {
let request_data: TimelineCreateRequest = json_request(&mut request).await?;
let ttid = TenantTimelineId {
tenant_id: request_data.tenant_id,
timeline_id: request_data.timeline_id,
};
check_permission(&request, Some(ttid.tenant_id))?;
let server_info = ServerInfo {
pg_version: request_data.pg_version,
system_id: request_data.system_id.unwrap_or(0),
wal_seg_size: request_data.wal_seg_size.unwrap_or(WAL_SEGMENT_SIZE as u32),
};
let global_timelines = get_global_timelines(&request);
global_timelines
.create(
ttid,
request_data.mconf,
server_info,
request_data.start_lsn,
request_data.commit_lsn.unwrap_or(request_data.start_lsn),
)
.await
.map_err(ApiError::InternalServerError)?;
json_response(StatusCode::OK, ())
}
async fn utilization_handler(request: Request<Body>) -> Result<Response<Body>, ApiError> {
check_permission(&request, None)?;
let global_timelines = get_global_timelines(&request);
let utilization = global_timelines.get_timeline_counts();
json_response(StatusCode::OK, utilization)
}
/// List all (not deleted) timelines.
/// Note: it is possible to do the same with debug_dump.
async fn timeline_list_handler(request: Request<Body>) -> Result<Response<Body>, ApiError> {
check_permission(&request, None)?;
let global_timelines = get_global_timelines(&request);
let res: Vec<TenantTimelineId> = global_timelines
.get_all()
.iter()
.map(|tli| tli.ttid)
.collect();
json_response(StatusCode::OK, res)
}
impl From<TermSwitchApiEntry> for TermLsn {
fn from(api_val: TermSwitchApiEntry) -> Self {
TermLsn {
term: api_val.term,
lsn: api_val.lsn,
}
}
}
/// Report info about timeline.
async fn timeline_status_handler(request: Request<Body>) -> Result<Response<Body>, ApiError> {
let ttid = TenantTimelineId::new(
parse_request_param(&request, "tenant_id")?,
parse_request_param(&request, "timeline_id")?,
);
check_permission(&request, Some(ttid.tenant_id))?;
let global_timelines = get_global_timelines(&request);
let tli = global_timelines.get(ttid).map_err(ApiError::from)?;
let (inmem, state) = tli.get_state().await;
let flush_lsn = tli.get_flush_lsn().await;
let last_log_term = state.acceptor_state.get_last_log_term(flush_lsn);
let term_history = state
.acceptor_state
.term_history
.0
.into_iter()
.map(|ts| TermSwitchApiEntry {
term: ts.term,
lsn: ts.lsn,
})
.collect();
let acc_state = AcceptorStateStatus {
term: state.acceptor_state.term,
epoch: last_log_term,
term_history,
};
let conf = get_conf(&request);
// Note: we report in memory values which can be lost.
let status = TimelineStatus {
tenant_id: ttid.tenant_id,
timeline_id: ttid.timeline_id,
mconf: state.mconf,
acceptor_state: acc_state,
pg_info: state.server,
flush_lsn,
timeline_start_lsn: state.timeline_start_lsn,
local_start_lsn: state.local_start_lsn,
commit_lsn: inmem.commit_lsn,
backup_lsn: inmem.backup_lsn,
peer_horizon_lsn: inmem.peer_horizon_lsn,
remote_consistent_lsn: inmem.remote_consistent_lsn,
peers: tli.get_peers(conf).await,
walsenders: tli.get_walsenders().get_all_public(),
walreceivers: tli.get_walreceivers().get_all(),
};
json_response(StatusCode::OK, status)
}
/// Deactivates the timeline and removes its data directory.
async fn timeline_delete_handler(mut request: Request<Body>) -> Result<Response<Body>, ApiError> {
let ttid = TenantTimelineId::new(
parse_request_param(&request, "tenant_id")?,
parse_request_param(&request, "timeline_id")?,
);
let only_local = parse_query_param(&request, "only_local")?.unwrap_or(false);
check_permission(&request, Some(ttid.tenant_id))?;
ensure_no_body(&mut request).await?;
let global_timelines = get_global_timelines(&request);
// FIXME: `delete_force` can fail from both internal errors and bad requests. Add better
// error handling here when we're able to.
let resp = global_timelines
.delete(&ttid, only_local)
.await
.map_err(ApiError::InternalServerError)?;
json_response(StatusCode::OK, resp)
}
/// Pull timeline from peer safekeeper instances.
async fn timeline_pull_handler(mut request: Request<Body>) -> Result<Response<Body>, ApiError> {
check_permission(&request, None)?;
let data: pull_timeline::Request = json_request(&mut request).await?;
let conf = get_conf(&request);
let global_timelines = get_global_timelines(&request);
let resp = pull_timeline::handle_request(data, conf.sk_auth_token.clone(), global_timelines)
.await
.map_err(ApiError::InternalServerError)?;
json_response(StatusCode::OK, resp)
}
/// Stream tar archive with all timeline data.
async fn timeline_snapshot_handler(request: Request<Body>) -> Result<Response<Body>, ApiError> {
let destination = parse_request_param(&request, "destination_id")?;
let ttid = TenantTimelineId::new(
parse_request_param(&request, "tenant_id")?,
parse_request_param(&request, "timeline_id")?,
);
check_permission(&request, Some(ttid.tenant_id))?;
let global_timelines = get_global_timelines(&request);
let tli = global_timelines.get(ttid).map_err(ApiError::from)?;
// To stream the body use wrap_stream which wants Stream of Result<Bytes>,
// so create the chan and write to it in another task.
let (tx, rx) = mpsc::channel(1);
let conf = get_conf(&request);
task::spawn(pull_timeline::stream_snapshot(
tli,
conf.my_id,
destination,
tx,
));
let rx_stream = ReceiverStream::new(rx);
let body = Body::wrap_stream(rx_stream);
let response = Response::builder()
.status(200)
.header(hyper::header::CONTENT_TYPE, "application/octet-stream")
.body(body)
.unwrap();
Ok(response)
}
/// Consider switching timeline membership configuration to the provided one.
async fn timeline_membership_handler(
mut request: Request<Body>,
) -> Result<Response<Body>, ApiError> {
let ttid = TenantTimelineId::new(
parse_request_param(&request, "tenant_id")?,
parse_request_param(&request, "timeline_id")?,
);
check_permission(&request, Some(ttid.tenant_id))?;
let global_timelines = get_global_timelines(&request);
let tli = global_timelines.get(ttid).map_err(ApiError::from)?;
let data: models::TimelineMembershipSwitchRequest = json_request(&mut request).await?;
let response = tli
.membership_switch(data.mconf)
.await
.map_err(ApiError::InternalServerError)?;
json_response(StatusCode::OK, response)
}
async fn timeline_copy_handler(mut request: Request<Body>) -> Result<Response<Body>, ApiError> {
check_permission(&request, None)?;
let request_data: TimelineCopyRequest = json_request(&mut request).await?;
let source_ttid = TenantTimelineId::new(
parse_request_param(&request, "tenant_id")?,
parse_request_param(&request, "source_timeline_id")?,
);
let global_timelines = get_global_timelines(&request);
copy_timeline::handle_request(copy_timeline::Request{
source_ttid,
until_lsn: request_data.until_lsn,
destination_ttid: TenantTimelineId::new(source_ttid.tenant_id, request_data.target_timeline_id),
}, global_timelines)
.instrument(info_span!("copy_timeline", from=%source_ttid, to=%request_data.target_timeline_id, until_lsn=%request_data.until_lsn))
.await
.map_err(ApiError::InternalServerError)?;
json_response(StatusCode::OK, ())
}
async fn patch_control_file_handler(
mut request: Request<Body>,
) -> Result<Response<Body>, ApiError> {
check_permission(&request, None)?;
let ttid = TenantTimelineId::new(
parse_request_param(&request, "tenant_id")?,
parse_request_param(&request, "timeline_id")?,
);
let global_timelines = get_global_timelines(&request);
let tli = global_timelines.get(ttid).map_err(ApiError::from)?;
let patch_request: patch_control_file::Request = json_request(&mut request).await?;
let response = patch_control_file::handle_request(tli, patch_request)
.await
.map_err(ApiError::InternalServerError)?;
json_response(StatusCode::OK, response)
}
/// Force persist control file.
async fn timeline_checkpoint_handler(request: Request<Body>) -> Result<Response<Body>, ApiError> {
check_permission(&request, None)?;
let ttid = TenantTimelineId::new(
parse_request_param(&request, "tenant_id")?,
parse_request_param(&request, "timeline_id")?,
);
let global_timelines = get_global_timelines(&request);
let tli = global_timelines.get(ttid)?;
tli.write_shared_state()
.await
.sk
.state_mut()
.flush()
.await
.map_err(ApiError::InternalServerError)?;
json_response(StatusCode::OK, ())
}
async fn timeline_digest_handler(request: Request<Body>) -> Result<Response<Body>, ApiError> {
let ttid = TenantTimelineId::new(
parse_request_param(&request, "tenant_id")?,
parse_request_param(&request, "timeline_id")?,
);
check_permission(&request, Some(ttid.tenant_id))?;
let global_timelines = get_global_timelines(&request);
let from_lsn: Option<Lsn> = parse_query_param(&request, "from_lsn")?;
let until_lsn: Option<Lsn> = parse_query_param(&request, "until_lsn")?;
let request = TimelineDigestRequest {
from_lsn: from_lsn.ok_or(ApiError::BadRequest(anyhow::anyhow!(
"from_lsn is required"
)))?,
until_lsn: until_lsn.ok_or(ApiError::BadRequest(anyhow::anyhow!(
"until_lsn is required"
)))?,
};
let tli = global_timelines.get(ttid).map_err(ApiError::from)?;
let tli = tli
.wal_residence_guard()
.await
.map_err(ApiError::InternalServerError)?;
let response = debug_dump::calculate_digest(&tli, request)
.await
.map_err(ApiError::InternalServerError)?;
json_response(StatusCode::OK, response)
}
/// Unevict timeline and remove uploaded partial segment(s) from the remote storage.
/// Successfull response returns list of segments existed before the deletion.
/// Aimed for one-off usage not normally needed.
async fn timeline_backup_partial_reset(request: Request<Body>) -> Result<Response<Body>, ApiError> {
let ttid = TenantTimelineId::new(
parse_request_param(&request, "tenant_id")?,
parse_request_param(&request, "timeline_id")?,
);
check_permission(&request, Some(ttid.tenant_id))?;
let global_timelines = get_global_timelines(&request);
let tli = global_timelines.get(ttid).map_err(ApiError::from)?;
let response = tli
.backup_partial_reset()
.await
.map_err(ApiError::InternalServerError)?;
json_response(StatusCode::OK, response)
}
/// Make term at least as high as one in request. If one in request is None,
/// increment current one.
async fn timeline_term_bump_handler(
mut request: Request<Body>,
) -> Result<Response<Body>, ApiError> {
let ttid = TenantTimelineId::new(
parse_request_param(&request, "tenant_id")?,
parse_request_param(&request, "timeline_id")?,
);
check_permission(&request, Some(ttid.tenant_id))?;
let request_data: TimelineTermBumpRequest = json_request(&mut request).await?;
let global_timelines = get_global_timelines(&request);
let tli = global_timelines.get(ttid).map_err(ApiError::from)?;
let response = tli
.term_bump(request_data.term)
.await
.map_err(ApiError::InternalServerError)?;
json_response(StatusCode::OK, response)
}
/// Used only in tests to hand craft required data.
async fn record_safekeeper_info(mut request: Request<Body>) -> Result<Response<Body>, ApiError> {
let ttid = TenantTimelineId::new(
parse_request_param(&request, "tenant_id")?,
parse_request_param(&request, "timeline_id")?,
);
check_permission(&request, Some(ttid.tenant_id))?;
let sk_info: SkTimelineInfo = json_request(&mut request).await?;
let proto_sk_info = SafekeeperTimelineInfo {
safekeeper_id: 0,
tenant_timeline_id: Some(ProtoTenantTimelineId {
tenant_id: ttid.tenant_id.as_ref().to_owned(),
timeline_id: ttid.timeline_id.as_ref().to_owned(),
}),
term: sk_info.term.unwrap_or(0),
last_log_term: sk_info.last_log_term.unwrap_or(0),
flush_lsn: sk_info.flush_lsn.0,
commit_lsn: sk_info.commit_lsn.0,
remote_consistent_lsn: sk_info.remote_consistent_lsn.0,
peer_horizon_lsn: sk_info.peer_horizon_lsn.0,
safekeeper_connstr: sk_info.safekeeper_connstr.unwrap_or_else(|| "".to_owned()),
http_connstr: sk_info.http_connstr.unwrap_or_else(|| "".to_owned()),
backup_lsn: sk_info.backup_lsn.0,
local_start_lsn: sk_info.local_start_lsn.0,
availability_zone: None,
standby_horizon: sk_info.standby_horizon.0,
};
let global_timelines = get_global_timelines(&request);
let tli = global_timelines.get(ttid).map_err(ApiError::from)?;
tli.record_safekeeper_info(proto_sk_info)
.await
.map_err(ApiError::InternalServerError)?;
json_response(StatusCode::OK, ())
}
fn parse_kv_str<E: fmt::Display, T: FromStr<Err = E>>(k: &str, v: &str) -> Result<T, ApiError> {
v.parse()
.map_err(|e| ApiError::BadRequest(anyhow::anyhow!("cannot parse {k}: {e}")))
}
/// Dump debug info about all available safekeeper state.
async fn dump_debug_handler(mut request: Request<Body>) -> Result<Response<Body>, ApiError> {
check_permission(&request, None)?;
ensure_no_body(&mut request).await?;
let mut dump_all: Option<bool> = None;
let mut dump_control_file: Option<bool> = None;
let mut dump_memory: Option<bool> = None;
let mut dump_disk_content: Option<bool> = None;
let mut dump_term_history: Option<bool> = None;
let mut dump_wal_last_modified: Option<bool> = None;
let mut tenant_id: Option<TenantId> = None;
let mut timeline_id: Option<TimelineId> = None;
let query = request.uri().query().unwrap_or("");
let mut values = url::form_urlencoded::parse(query.as_bytes());
for (k, v) in &mut values {
match k.as_ref() {
"dump_all" => dump_all = Some(parse_kv_str(&k, &v)?),
"dump_control_file" => dump_control_file = Some(parse_kv_str(&k, &v)?),
"dump_memory" => dump_memory = Some(parse_kv_str(&k, &v)?),
"dump_disk_content" => dump_disk_content = Some(parse_kv_str(&k, &v)?),
"dump_term_history" => dump_term_history = Some(parse_kv_str(&k, &v)?),
"dump_wal_last_modified" => dump_wal_last_modified = Some(parse_kv_str(&k, &v)?),
"tenant_id" => tenant_id = Some(parse_kv_str(&k, &v)?),
"timeline_id" => timeline_id = Some(parse_kv_str(&k, &v)?),
_ => Err(ApiError::BadRequest(anyhow::anyhow!(
"Unknown query parameter: {}",
k
)))?,
}
}
let dump_all = dump_all.unwrap_or(false);
let dump_control_file = dump_control_file.unwrap_or(dump_all);
let dump_memory = dump_memory.unwrap_or(dump_all);
let dump_disk_content = dump_disk_content.unwrap_or(dump_all);
let dump_term_history = dump_term_history.unwrap_or(true);
let dump_wal_last_modified = dump_wal_last_modified.unwrap_or(dump_all);
let global_timelines = get_global_timelines(&request);
let args = debug_dump::Args {
dump_all,
dump_control_file,
dump_memory,
dump_disk_content,
dump_term_history,
dump_wal_last_modified,
tenant_id,
timeline_id,
};
let resp = debug_dump::build(args, global_timelines)
.await
.map_err(ApiError::InternalServerError)?;
let started_at = std::time::Instant::now();
let (tx, rx) = mpsc::channel(1);
let body = Body::wrap_stream(ReceiverStream::new(rx));
let mut writer = ChannelWriter::new(128 * 1024, tx);
let response = Response::builder()
.status(200)
.header(hyper::header::CONTENT_TYPE, "application/octet-stream")
.body(body)
.unwrap();
let span = info_span!("blocking");
tokio::task::spawn_blocking(move || {
let _span = span.entered();
let res = serde_json::to_writer(&mut writer, &resp)
.map_err(std::io::Error::from)
.and_then(|_| writer.flush());
match res {
Ok(()) => {
tracing::info!(
bytes = writer.flushed_bytes(),
elapsed_ms = started_at.elapsed().as_millis(),
"responded /v1/debug_dump"
);
}
Err(e) => {
tracing::warn!("failed to write out /v1/debug_dump response: {e:#}");
// semantics of this error are quite... unclear. we want to error the stream out to
// abort the response to somehow notify the client that we failed.
//
// though, most likely the reason for failure is that the receiver is already gone.
drop(
writer
.tx
.blocking_send(Err(std::io::ErrorKind::BrokenPipe.into())),
);
}
}
});
Ok(response)
}
/// Safekeeper http router.
pub fn make_router(
conf: Arc<SafeKeeperConf>,
global_timelines: Arc<GlobalTimelines>,
) -> RouterBuilder<hyper::Body, ApiError> {
let mut router = endpoint::make_router();
if conf.http_auth.is_some() {
router = router.middleware(auth_middleware(|request| {
const ALLOWLIST_ROUTES: &[&str] =
&["/v1/status", "/metrics", "/profile/cpu", "/profile/heap"];
if ALLOWLIST_ROUTES.contains(&request.uri().path()) {
None
} else {
// Option<Arc<SwappableJwtAuth>> is always provided as data below, hence unwrap().
request
.data::<Option<Arc<SwappableJwtAuth>>>()
.unwrap()
.as_deref()
}
}))
}
// NB: on any changes do not forget to update the OpenAPI spec
// located nearby (/safekeeper/src/http/openapi_spec.yaml).
let auth = conf.http_auth.clone();
router
.data(conf)
.data(global_timelines)
.data(auth)
.get("/metrics", |r| request_span(r, prometheus_metrics_handler))
.get("/profile/cpu", |r| request_span(r, profile_cpu_handler))
.get("/profile/heap", |r| request_span(r, profile_heap_handler))
.get("/v1/status", |r| request_span(r, status_handler))
.put("/v1/failpoints", |r| {
request_span(r, move |r| async {
check_permission(&r, None)?;
let cancel = CancellationToken::new();
failpoints_handler(r, cancel).await
})
})
.get("/v1/utilization", |r| request_span(r, utilization_handler))
.delete("/v1/tenant/:tenant_id", |r| {
request_span(r, tenant_delete_handler)
})
// Will be used in the future instead of implicit timeline creation
.post("/v1/tenant/timeline", |r| {
request_span(r, timeline_create_handler)
})
.get("/v1/tenant/timeline", |r| {
request_span(r, timeline_list_handler)
})
.get("/v1/tenant/:tenant_id/timeline/:timeline_id", |r| {
request_span(r, timeline_status_handler)
})
.delete("/v1/tenant/:tenant_id/timeline/:timeline_id", |r| {
request_span(r, timeline_delete_handler)
})
.post("/v1/pull_timeline", |r| {
request_span(r, timeline_pull_handler)
})
.get(
"/v1/tenant/:tenant_id/timeline/:timeline_id/snapshot/:destination_id",
|r| request_span(r, timeline_snapshot_handler),
)
.post(
"/v1/tenant/:tenant_id/timeline/:timeline_id/membership",
|r| request_span(r, timeline_membership_handler),
)
.post(
"/v1/tenant/:tenant_id/timeline/:source_timeline_id/copy",
|r| request_span(r, timeline_copy_handler),
)
.patch(
"/v1/tenant/:tenant_id/timeline/:timeline_id/control_file",
|r| request_span(r, patch_control_file_handler),
)
.post(
"/v1/tenant/:tenant_id/timeline/:timeline_id/checkpoint",
|r| request_span(r, timeline_checkpoint_handler),
)
.get("/v1/tenant/:tenant_id/timeline/:timeline_id/digest", |r| {
request_span(r, timeline_digest_handler)
})
.post(
"/v1/tenant/:tenant_id/timeline/:timeline_id/backup_partial_reset",
|r| request_span(r, timeline_backup_partial_reset),
)
.post(
"/v1/tenant/:tenant_id/timeline/:timeline_id/term_bump",
|r| request_span(r, timeline_term_bump_handler),
)
.post("/v1/record_safekeeper_info/:tenant_id/:timeline_id", |r| {
request_span(r, record_safekeeper_info)
})
.get("/v1/debug_dump", |r| request_span(r, dump_debug_handler))
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_term_switch_entry_api_serialize() {
let state = AcceptorStateStatus {
term: 1,
epoch: 1,
term_history: vec![TermSwitchApiEntry {
term: 1,
lsn: Lsn(0x16FFDDDD),
}],
};
let json = serde_json::to_string(&state).unwrap();
assert_eq!(
json,
"{\"term\":1,\"epoch\":1,\"term_history\":[{\"term\":1,\"lsn\":\"0/16FFDDDD\"}]}"
);
}
}