core-lightning/lightningd/notification.h

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#ifndef LIGHTNING_LIGHTNINGD_NOTIFICATION_H
#define LIGHTNING_LIGHTNINGD_NOTIFICATION_H
#include "config.h"
#include <common/coin_mvt.h>
#include <lightningd/pay.h>
#include <lightningd/plugin.h>
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struct balance_snapshot;
struct onionreply;
struct wally_psbt;
bool notifications_have_topic(const struct plugins *plugins, const char *topic);
/* Is the provided notification topic native, i.e., provided by
* lightningd itself? */
bool notifications_topic_is_native(const char *topic);
struct notification {
const char *topic;
/* the serialization interface */
void *serialize;
};
AUTODATA_TYPE(notifications, struct notification);
/* FIXME: Find a way to avoid back-to-back declaration and definition */
#define REGISTER_NOTIFICATION(topic, serialize) \
struct notification topic##_notification_gen = { \
stringify(topic), \
serialize, \
}; \
AUTODATA(notifications, &topic##_notification_gen);
void notify_connect(struct lightningd *ld,
const struct node_id *nodeid,
bool incoming,
const struct wireaddr_internal *addr);
void notify_disconnect(struct lightningd *ld, struct node_id *nodeid);
plugin: Add new notification type: warning This notification bases on `LOG_BROKEN` and `LOG_UNUSUAL` level log. --Introduction A notification for topic `warning` is sent every time a new `BROKEN`/ `UNUSUAL` level(in plugins, we use `error`/`warn`) log generated, which means an unusual/borken thing happens, such as channel failed, message resolving failed... ```json { "warning": { "level": "warn", "time": "1559743608.565342521", "source": "lightningd(17652): 0821f80652fb840239df8dc99205792bba2e559a05469915804c08420230e23c7c chan #7854:", "log": "Peer permanent failure in CHANNELD_NORMAL: lightning_channeld: sent ERROR bad reestablish dataloss msg" } } ``` 1. `level` is `warn` or `error`: `warn` means something seems bad happened and it's under control, but we'd better check it; `error` means something extremely bad is out of control, and it may lead to crash; 2. `time` is the second since epoch; 3. `source`, in fact, is the `prefix` of the log_entry. It means where the event happened, it may have the following forms: `<node_id> chan #<db_id_of_channel>:`, `lightningd(<lightningd_pid>):`, `plugin-<plugin_name>:`, `<daemon_name>(<daemon_pid>):`, `jsonrpc:`, `jcon fd <error_fd_to_jsonrpc>:`, `plugin-manager`; 4. `log` is the context of the original log entry. --Note: 1. The main code uses `UNUSUAL`/`BROKEN`, and plugin module uses `warn` /`error`, considering the consistency with plugin, warning choose `warn` /`error`. But users who use c-lightning with plugins may want to `getlog` with specified level when receive warning. It's the duty for plugin dev to turn `warn`/`error` into `UNUSUAL`/`BROKEN` and present it to the users, or pass it directly to `getlog`; 2. About time, `json_log()` in `log` module uses the Relative Time, from the time when `log_book` inited to the time when this event happend. But I consider the `UNUSUAL`/`BROKEN` event is rare, and it is very likely to happen after running for a long time, so for users, they will pay more attention to Absolute Time. -- Related Change 1. Remove the definitions of `log`, `log_book`, `log_entry` from `log.c` to `log.h`, then they can be used in warning declaration and definition. 2. Remove `void json_add_time(struct json_stream *result, const char *fieldname, struct timespec ts)` from `log.c` to `json.c`, and add related declaration in `json.h`. Now the notification function in `notification.c` can call it. 2. Add a pointer to `struct lightningd` in `struct log_book`. This may affect the independence of the `log` module, but storing a pointer to `ld` is more direct;
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void notify_warning(struct lightningd *ld, struct log_entry *l);
void notify_invoice_payment(struct lightningd *ld, struct amount_msat amount,
struct preimage preimage, const struct json_escape *label);
void notify_invoice_creation(struct lightningd *ld, struct amount_msat *amount,
struct preimage preimage, const struct json_escape *label);
void notify_channel_opened(struct lightningd *ld, struct node_id *node_id,
struct amount_sat *funding_sat, struct bitcoin_txid *funding_txid,
bool *funding_locked);
void notify_channel_state_changed(struct lightningd *ld,
struct node_id *peer_id,
struct channel_id *cid,
struct short_channel_id *scid,
struct timeabs *timestamp,
enum channel_state old_state,
enum channel_state new_state,
enum state_change cause,
char *message);
Plugin: New notification type, forward_event `forward_event` A notification for topic `forward_event` is sent every time the status of a forward payment is set. The json format is same as the API `listforwards`. ```json { "forward_event": { "payment_hash": "f5a6a059a25d1e329d9b094aeeec8c2191ca037d3f5b0662e21ae850debe8ea2", "in_channel": "103x2x1", "out_channel": "103x1x1", "in_msatoshi": 100001001, "in_msat": "100001001msat", "out_msatoshi": 100000000, "out_msat": "100000000msat", "fee": 1001, "fee_msat": "1001msat", "status": "settled", "received_time": 1560696342.368, "resolved_time": 1560696342.556 } } ``` or ```json { "forward_event": { "payment_hash": "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "in_channel": "103x2x1", "out_channel": "110x1x0", "in_msatoshi": 100001001, "in_msat": "100001001msat", "out_msatoshi": 100000000, "out_msat": "100000000msat", "fee": 1001, "fee_msat": "1001msat", "status": "local_failed", "failcode": 16392, "failreason": "WIRE_PERMANENT_CHANNEL_FAILURE", "received_time": 1560696343.052 } } ``` - The status includes `offered`, `settled`, `failed` and `local_failed`, and they are all string type in json. - When the forward payment is valid for us, we'll set `offered` and send the forward payment to next hop to resolve; - When the payment forwarded by us gets paid eventually, the forward payment will change the status from `offered` to `settled`; - If payment fails locally(like failing to resolve locally) or the corresponding htlc with next hop fails(like htlc timeout), we will set the status as `local_failed`. `local_failed` may be set before setting `offered` or after setting `offered`. In fact, from the time we receive the htlc of the previous hop, all we can know the cause of the failure is treated as `local_failed`. `local_failed` only occuors locally or happens in the htlc between us and next hop; - If `local_failed` is set before `offered`, this means we just received htlc from the previous hop and haven't generate htlc for next hop. In this case, the json of `forward_event` sets the fields of `out_msatoshi`, `out_msat`,`fee` and `out_channel` as 0; - Note: In fact, for this case we may be not sure if this incoming htlc represents a pay to us or a payment we need to forward. We just simply treat all incoming failed to resolve as `local_failed`. - Only in `local_failed` case, json includes `failcode` and `failreason` fields; - `failed` means the payment forwarded by us fails in the latter hops, and the failure isn't related to us, so we aren't accessed to the fail reason. `failed` must be set after `offered`. - `failed` case doesn't include `failcode` and `failreason` fields; - `received_time` means when we received the htlc of this payment from the previous peer. It will be contained into all status case; - `resolved_time` means when the htlc of this payment between us and the next peer was resolved. The resolved result may success or fail, so only `settled` and `failed` case contain `resolved_time`; - The `failcode` and `failreason` are defined in [BOLT 4][bolt4-failure-codes].
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void notify_forward_event(struct lightningd *ld,
const struct htlc_in *in,
/* May be NULL if we don't know. */
const struct short_channel_id *scid_out,
/* May be NULL. */
const struct amount_msat *amount_out,
Plugin: New notification type, forward_event `forward_event` A notification for topic `forward_event` is sent every time the status of a forward payment is set. The json format is same as the API `listforwards`. ```json { "forward_event": { "payment_hash": "f5a6a059a25d1e329d9b094aeeec8c2191ca037d3f5b0662e21ae850debe8ea2", "in_channel": "103x2x1", "out_channel": "103x1x1", "in_msatoshi": 100001001, "in_msat": "100001001msat", "out_msatoshi": 100000000, "out_msat": "100000000msat", "fee": 1001, "fee_msat": "1001msat", "status": "settled", "received_time": 1560696342.368, "resolved_time": 1560696342.556 } } ``` or ```json { "forward_event": { "payment_hash": "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "in_channel": "103x2x1", "out_channel": "110x1x0", "in_msatoshi": 100001001, "in_msat": "100001001msat", "out_msatoshi": 100000000, "out_msat": "100000000msat", "fee": 1001, "fee_msat": "1001msat", "status": "local_failed", "failcode": 16392, "failreason": "WIRE_PERMANENT_CHANNEL_FAILURE", "received_time": 1560696343.052 } } ``` - The status includes `offered`, `settled`, `failed` and `local_failed`, and they are all string type in json. - When the forward payment is valid for us, we'll set `offered` and send the forward payment to next hop to resolve; - When the payment forwarded by us gets paid eventually, the forward payment will change the status from `offered` to `settled`; - If payment fails locally(like failing to resolve locally) or the corresponding htlc with next hop fails(like htlc timeout), we will set the status as `local_failed`. `local_failed` may be set before setting `offered` or after setting `offered`. In fact, from the time we receive the htlc of the previous hop, all we can know the cause of the failure is treated as `local_failed`. `local_failed` only occuors locally or happens in the htlc between us and next hop; - If `local_failed` is set before `offered`, this means we just received htlc from the previous hop and haven't generate htlc for next hop. In this case, the json of `forward_event` sets the fields of `out_msatoshi`, `out_msat`,`fee` and `out_channel` as 0; - Note: In fact, for this case we may be not sure if this incoming htlc represents a pay to us or a payment we need to forward. We just simply treat all incoming failed to resolve as `local_failed`. - Only in `local_failed` case, json includes `failcode` and `failreason` fields; - `failed` means the payment forwarded by us fails in the latter hops, and the failure isn't related to us, so we aren't accessed to the fail reason. `failed` must be set after `offered`. - `failed` case doesn't include `failcode` and `failreason` fields; - `received_time` means when we received the htlc of this payment from the previous peer. It will be contained into all status case; - `resolved_time` means when the htlc of this payment between us and the next peer was resolved. The resolved result may success or fail, so only `settled` and `failed` case contain `resolved_time`; - The `failcode` and `failreason` are defined in [BOLT 4][bolt4-failure-codes].
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enum forward_status state,
enum onion_wire failcode,
struct timeabs *resolved_time,
enum forward_style forward_style);
Plugin: New notification type, forward_event `forward_event` A notification for topic `forward_event` is sent every time the status of a forward payment is set. The json format is same as the API `listforwards`. ```json { "forward_event": { "payment_hash": "f5a6a059a25d1e329d9b094aeeec8c2191ca037d3f5b0662e21ae850debe8ea2", "in_channel": "103x2x1", "out_channel": "103x1x1", "in_msatoshi": 100001001, "in_msat": "100001001msat", "out_msatoshi": 100000000, "out_msat": "100000000msat", "fee": 1001, "fee_msat": "1001msat", "status": "settled", "received_time": 1560696342.368, "resolved_time": 1560696342.556 } } ``` or ```json { "forward_event": { "payment_hash": "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "in_channel": "103x2x1", "out_channel": "110x1x0", "in_msatoshi": 100001001, "in_msat": "100001001msat", "out_msatoshi": 100000000, "out_msat": "100000000msat", "fee": 1001, "fee_msat": "1001msat", "status": "local_failed", "failcode": 16392, "failreason": "WIRE_PERMANENT_CHANNEL_FAILURE", "received_time": 1560696343.052 } } ``` - The status includes `offered`, `settled`, `failed` and `local_failed`, and they are all string type in json. - When the forward payment is valid for us, we'll set `offered` and send the forward payment to next hop to resolve; - When the payment forwarded by us gets paid eventually, the forward payment will change the status from `offered` to `settled`; - If payment fails locally(like failing to resolve locally) or the corresponding htlc with next hop fails(like htlc timeout), we will set the status as `local_failed`. `local_failed` may be set before setting `offered` or after setting `offered`. In fact, from the time we receive the htlc of the previous hop, all we can know the cause of the failure is treated as `local_failed`. `local_failed` only occuors locally or happens in the htlc between us and next hop; - If `local_failed` is set before `offered`, this means we just received htlc from the previous hop and haven't generate htlc for next hop. In this case, the json of `forward_event` sets the fields of `out_msatoshi`, `out_msat`,`fee` and `out_channel` as 0; - Note: In fact, for this case we may be not sure if this incoming htlc represents a pay to us or a payment we need to forward. We just simply treat all incoming failed to resolve as `local_failed`. - Only in `local_failed` case, json includes `failcode` and `failreason` fields; - `failed` means the payment forwarded by us fails in the latter hops, and the failure isn't related to us, so we aren't accessed to the fail reason. `failed` must be set after `offered`. - `failed` case doesn't include `failcode` and `failreason` fields; - `received_time` means when we received the htlc of this payment from the previous peer. It will be contained into all status case; - `resolved_time` means when the htlc of this payment between us and the next peer was resolved. The resolved result may success or fail, so only `settled` and `failed` case contain `resolved_time`; - The `failcode` and `failreason` are defined in [BOLT 4][bolt4-failure-codes].
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void notify_sendpay_success(struct lightningd *ld,
const struct wallet_payment *payment);
void notify_sendpay_failure(struct lightningd *ld,
const struct wallet_payment *payment,
errcode_t pay_errcode,
const struct onionreply *onionreply,
const struct routing_failure *fail,
const char *errmsg);
void notify_coin_mvt(struct lightningd *ld,
const struct coin_mvt *mvt);
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void notify_balance_snapshot(struct lightningd *ld,
const struct balance_snapshot *snap);
void notify_openchannel_peer_sigs(struct lightningd *ld,
const struct channel_id *cid,
const struct wally_psbt *psbt);
void notify_channel_open_failed(struct lightningd *ld,
const struct channel_id *cid);
/* Tell this plugin to shutdown: returns true if it was subscribed. */
bool notify_plugin_shutdown(struct lightningd *ld, struct plugin *p);
#endif /* LIGHTNING_LIGHTNINGD_NOTIFICATION_H */