library/c/api.go
// Set of functions that are exported when go-waku is built as a static/dynamic library
package main
/*
#include <stdlib.h>
#include <stddef.h>
// The possible returned values for the functions that return int
static const int RET_OK = 0;
static const int RET_ERR = 1;
static const int RET_MISSING_CALLBACK = 2;
typedef void (*WakuCallBack) (int ret_code, const char* msg, void * user_data);
*/
import "C"
import (
"fmt"
"unsafe"
"github.com/waku-org/go-waku/library"
"github.com/waku-org/go-waku/waku/v2/protocol"
)
func main() {}
// Initialize a waku node. Receives a JSON string containing the configuration
// for the node. It can be NULL. Example configuration:
// ```
// {"host": "0.0.0.0", "port": 60000, "advertiseAddr": "1.2.3.4", "nodeKey": "0x123...567", "keepAliveInterval": 20, "relay": true}
// ```
// All keys are optional. If not specified a default value will be set:
// - host: IP address. Default 0.0.0.0
// - port: TCP port to listen. Default 60000. Use 0 for random
// - advertiseAddr: External IP
// - nodeKey: secp256k1 private key. Default random
// - keepAliveInterval: interval in seconds to ping all peers
// - relay: Enable WakuRelay. Default `true`
// - relayTopics: Array of pubsub topics that WakuRelay will automatically subscribe to when the node starts
// - gossipsubParams: an object containing custom gossipsub parameters. All attributes are optional, and if not specified, it will use default values.
// - d: optimal degree for a GossipSub topic mesh. Default `6`
// - dLow: lower bound on the number of peers we keep in a GossipSub topic mesh. Default `5`
// - dHigh: upper bound on the number of peers we keep in a GossipSub topic mesh. Default `12`
// - dScore: affects how peers are selected when pruning a mesh due to over subscription. Default `4`
// - dOut: sets the quota for the number of outbound connections to maintain in a topic mesh. Default `2`
// - historyLength: controls the size of the message cache used for gossip. Default `5`
// - historyGossip: controls how many cached message ids we will advertise in IHAVE gossip messages. Default `3`
// - dLazy: affects how many peers we will emit gossip to at each heartbeat. Default `6`
// - gossipFactor: affects how many peers we will emit gossip to at each heartbeat. Default `0.25`
// - gossipRetransmission: controls how many times we will allow a peer to request the same message id through IWANT gossip before we start ignoring them. Default `3`
// - heartbeatInitialDelayMs: short delay in milliseconds before the heartbeat timer begins after the router is initialized. Default `100` milliseconds
// - heartbeatIntervalSeconds: controls the time between heartbeats. Default `1` second
// - slowHeartbeatWarning: duration threshold for heartbeat processing before emitting a warning. Default `0.1`
// - fanoutTTLSeconds: controls how long we keep track of the fanout state. Default `60` seconds
// - prunePeers: controls the number of peers to include in prune Peer eXchange. Default `16`
// - pruneBackoffSeconds: controls the backoff time for pruned peers. Default `60` seconds
// - unsubscribeBackoffSeconds: controls the backoff time to use when unsuscribing from a topic. Default `10` seconds
// - connectors: number of active connection attempts for peers obtained through PX. Default `8`
// - maxPendingConnections: maximum number of pending connections for peers attempted through px. Default `128`
// - connectionTimeoutSeconds: timeout in seconds for connection attempts. Default `30` seconds
// - directConnectTicks: the number of heartbeat ticks for attempting to reconnect direct peers that are not currently connected. Default `300`
// - directConnectInitialDelaySeconds: initial delay before opening connections to direct peers. Default `1` second
// - opportunisticGraftTicks: number of heartbeat ticks for attempting to improve the mesh with opportunistic grafting. Default `60`
// - opportunisticGraftPeers: the number of peers to opportunistically graft. Default `2`
// - graftFloodThresholdSeconds: If a GRAFT comes before GraftFloodThresholdSeconds has elapsed since the last PRUNE, then there is an extra score penalty applied to the peer through P7. Default `10` seconds
// - maxIHaveLength: max number of messages to include in an IHAVE message, also controls the max number of IHAVE ids we will accept and request with IWANT from a peer within a heartbeat. Default `5000`
// - maxIHaveMessages: max number of IHAVE messages to accept from a peer within a heartbeat. Default `10`
// - iWantFollowupTimeSeconds: Time to wait for a message requested through IWANT following an IHAVE advertisement. Default `3` seconds
// - seenMessagesTTLSeconds: configures when a previously seen message ID can be forgotten about. Default `120` seconds
//
// - minPeersToPublish: The minimum number of peers required on a topic to allow broadcasting a message. Default `0`
// - legacyFilter: Enable LegacyFilter. Default `false`
// - discV5: Enable DiscoveryV5. Default `false`
// - discV5BootstrapNodes: Array of bootstrap nodes ENR
// - discV5UDPPort: UDP port for DiscoveryV5
// - logLevel: Set the log level. Default `INFO`. Allowed values "DEBUG", "INFO", "WARN", "ERROR", "DPANIC", "PANIC", "FATAL"
// - store: Enable Store. Default `false`
// - databaseURL: url connection string. Default: "sqlite3://store.db". Also accepts PostgreSQL connection strings
// - storeRetentionMaxMessages: max number of messages to store in the database. Default 10000
// - storeRetentionTimeSeconds: max number of seconds that a message will be persisted in the database. Default 2592000 (30d)
// - websockets: an optional object containing settings to setup the websocket configuration
// - enabled: indicates if websockets support will be enabled. Default `false`
// - host: listening address for websocket connections. Default `0.0.0.0`
// - port: TCP listening port for websocket connection (0 for random, binding to 443 requires root access). Default: `60001“, if secure websockets support is enabled, the default is `6443“
// - secure: enable secure websockets support. Default `false`
// - certPath: secure websocket certificate path
// - keyPath: secure websocket key path
//
// - dns4DomainName: the domain name resolving to the node's public IPv4 address.
//
//export waku_new
func waku_new(configJSON *C.char, cb C.WakuCallBack, userData unsafe.Pointer) unsafe.Pointer {
if cb == nil {
panic("error: missing callback in waku_new")
}
cid := C.malloc(C.size_t(unsafe.Sizeof(uintptr(0))))
pid := (*uint)(cid)
instance := library.Init()
*pid = instance.ID
err := library.NewNode(instance, C.GoString(configJSON))
if err != nil {
onError(err, cb, userData)
return nil
}
return cid
}
// Starts the waku node
//
//export waku_start
func waku_start(ctx unsafe.Pointer, onErr C.WakuCallBack, userData unsafe.Pointer) C.int {
instance, err := getInstance(ctx)
if err != nil {
onError(err, onErr, userData)
}
err = library.Start(instance)
return onError(err, onErr, userData)
}
// Stops a waku node
//
//export waku_stop
func waku_stop(ctx unsafe.Pointer, onErr C.WakuCallBack, userData unsafe.Pointer) C.int {
instance, err := getInstance(ctx)
if err != nil {
onError(err, onErr, userData)
}
err = library.Stop(instance)
return onError(err, onErr, userData)
}
// Release the resources allocated to a waku node (stopping the node first if necessary)
//
//export waku_free
func waku_free(ctx unsafe.Pointer, onErr C.WakuCallBack, userData unsafe.Pointer) C.int {
instance, err := getInstance(ctx)
if err != nil {
return onError(err, onErr, userData)
}
err = library.Stop(instance)
if err != nil {
return onError(err, onErr, userData)
}
err = library.Free(instance)
if err == nil {
C.free(ctx)
}
return onError(err, onErr, userData)
}
// Determine is a node is started or not
//
//export waku_is_started
func waku_is_started(ctx unsafe.Pointer) C.int {
instance, err := getInstance(ctx)
if err != nil {
return 0
}
started := library.IsStarted(instance)
if started {
return 1
}
return 0
}
type fn func(instance *library.WakuInstance) (string, error)
type fnNoInstance func() (string, error)
func singleFnExec(f fn, ctx unsafe.Pointer, cb C.WakuCallBack, userData unsafe.Pointer) C.int {
instance, err := getInstance(ctx)
if err != nil {
onError(err, cb, userData)
}
result, err := f(instance)
if err != nil {
return onError(err, cb, userData)
}
return onSuccesfulResponse(result, cb, userData)
}
func singleFnExecNoCtx(f fnNoInstance, cb C.WakuCallBack, userData unsafe.Pointer) C.int {
result, err := f()
if err != nil {
return onError(err, cb, userData)
}
return onSuccesfulResponse(result, cb, userData)
}
// Obtain the peer ID of the waku node
//
//export waku_peerid
func waku_peerid(ctx unsafe.Pointer, cb C.WakuCallBack, userData unsafe.Pointer) C.int {
return singleFnExec(func(instance *library.WakuInstance) (string, error) {
return library.PeerID(instance)
}, ctx, cb, userData)
}
// Obtain the multiaddresses the wakunode is listening to
//
//export waku_listen_addresses
func waku_listen_addresses(ctx unsafe.Pointer, cb C.WakuCallBack, userData unsafe.Pointer) C.int {
return singleFnExec(func(instance *library.WakuInstance) (string, error) {
return library.ListenAddresses(instance)
}, ctx, cb, userData)
}
// Add node multiaddress and protocol to the wakunode peerstore
//
//export waku_add_peer
func waku_add_peer(ctx unsafe.Pointer, address *C.char, protocolID *C.char, cb C.WakuCallBack, userData unsafe.Pointer) C.int {
return singleFnExec(func(instance *library.WakuInstance) (string, error) {
return library.AddPeer(instance, C.GoString(address), C.GoString(protocolID))
}, ctx, cb, userData)
}
// Connect to peer at multiaddress. if ms > 0, cancel the function execution if it takes longer than N milliseconds
//
//export waku_connect
func waku_connect(ctx unsafe.Pointer, address *C.char, ms C.int, cb C.WakuCallBack, userData unsafe.Pointer) C.int {
instance, err := getInstance(ctx)
if err != nil {
onError(err, cb, userData)
}
err = library.Connect(instance, C.GoString(address), int(ms))
return onError(err, cb, userData)
}
// Connect to known peer by peerID. if ms > 0, cancel the function execution if it takes longer than N milliseconds
//
//export waku_connect_peerid
func waku_connect_peerid(ctx unsafe.Pointer, peerID *C.char, ms C.int, cb C.WakuCallBack, userData unsafe.Pointer) C.int {
instance, err := getInstance(ctx)
if err != nil {
onError(err, cb, userData)
}
err = library.ConnectPeerID(instance, C.GoString(peerID), int(ms))
return onError(err, cb, userData)
}
// Close connection to a known peer by peerID
//
//export waku_disconnect
func waku_disconnect(ctx unsafe.Pointer, peerID *C.char, cb C.WakuCallBack, userData unsafe.Pointer) C.int {
instance, err := getInstance(ctx)
if err != nil {
onError(err, cb, userData)
}
err = library.Disconnect(instance, C.GoString(peerID))
return onError(err, cb, userData)
}
// Get number of connected peers
//
//export waku_peer_cnt
func waku_peer_cnt(ctx unsafe.Pointer, cb C.WakuCallBack, userData unsafe.Pointer) C.int {
return singleFnExec(func(instance *library.WakuInstance) (string, error) {
peerCnt, err := library.PeerCnt(instance)
return fmt.Sprintf("%d", peerCnt), err
}, ctx, cb, userData)
}
// Create a content topic string according to RFC 23
//
//export waku_content_topic
func waku_content_topic(applicationName *C.char, applicationVersion *C.char, contentTopicName *C.char, encoding *C.char, cb C.WakuCallBack, userData unsafe.Pointer) C.int {
contentTopic, _ := protocol.NewContentTopic(C.GoString(applicationName), C.GoString(applicationVersion), C.GoString(contentTopicName), C.GoString(encoding))
return onSuccesfulResponse(contentTopic.String(), cb, userData)
}
// Get the default pubsub topic used in waku2: /waku/2/default-waku/proto
//
//export waku_default_pubsub_topic
func waku_default_pubsub_topic(cb C.WakuCallBack, userData unsafe.Pointer) C.int {
return onSuccesfulResponse(library.DefaultPubsubTopic(), cb, userData)
}
// Register callback to act as signal handler and receive application signals
// (in JSON) which are used to react to asynchronous events in waku. The function
// signature for the callback should be `void myCallback(char* signalJSON)`
//
//export waku_set_event_callback
func waku_set_event_callback(ctx unsafe.Pointer, cb C.WakuCallBack) {
instance, err := getInstance(ctx)
if err != nil {
panic(err.Error()) // TODO: refactor to return an error instead of panic
}
library.SetEventCallback(instance, unsafe.Pointer(cb))
}
// Retrieve the list of peers known by the waku node
//
//export waku_peers
func waku_peers(ctx unsafe.Pointer, cb C.WakuCallBack, userData unsafe.Pointer) C.int {
return singleFnExec(func(instance *library.WakuInstance) (string, error) {
return library.Peers(instance)
}, ctx, cb, userData)
}