go-waku/examples/c-bindings/main.c

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#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <stdint.h>
#include <inttypes.h>
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#include "libgowaku.h"
#include "nxjson.c"
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#include "base64.h"
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#include "main.h"
char *alicePrivKey = "0x4f012057e1a1458ce34189cb27daedbbe434f3df0825c1949475dec786e2c64e";
char *alicePubKey = "0x0440f05847c4c7166f57ae8ecaaf72d31bddcbca345e26713ca9e26c93fb8362ddcd5ae7f4533ee956428ad08a89cd18b234c2911a3b1c7fbd1c0047610d987302";
char *bobPrivKey = "0xb91d6b2df8fb6ef8b53b51b2b30a408c49d5e2b530502d58ac8f94e5c5de1453";
char *bobPubKey = "0x045eef61a98ba1cf44a2736fac91183ea2bd86e67de20fe4bff467a71249a8a0c05f795dd7f28ced7c15eaa69c89d4212cc4f526ca5e9a62e88008f506d850cccd";
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char* result = NULL;
char* contentTopic;
void handle_ok(const char* msg, size_t len) {
if (result != NULL) {
free(result);
}
result = malloc(len * sizeof(char) + 1);
strcpy(result, msg);
}
void handle_error(const char* msg, size_t len) {
printf("Error: %s\n", msg);
exit(1);
}
void callBack(const char* signal, size_t len_0)
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{
// This callback will be executed each time a new message is received
// Example signal:
/*{
"nodeId":1,
"type":"message",
"event":{
"pubsubTopic":"/waku/2/default-waku/proto",
"messageID":"0x6496491e40dbe0b6c3a2198c2426b16301688a2daebc4f57ad7706115eac3ad1",
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"wakuMessage":{
"payload":"BPABASUqWgRkgp73aW/FHIyGtJDYnStvaQvCoX9MdaNsOH39Vet0em6ipZc3lZ7kK9uFFtbJgIWfRaqTxSRjiFOPx88gXt1JeSm2SUwGSz+1gh2xTy0am8tXkc8OWSSjamdkEbXuVgAueLxHOnV3xlGwYt7nx2G5DWYqUu1BXv4yWHPOoiH2yx3fxX0OajgKGBwiMbadRNUuAUFPRM90f+bzG2y22ssHctDV/U6sXOa9ljNgpAx703Q3WIFleSRozto7ByNAdRFwWR0RGGV4l0btJXM7JpnrYcVC24dB0tJ3HVWuD0ZcwOM1zTL0wwc0hTezLHvI+f6bHSzsFGcCWIlc03KSoMjK1XENNL4dtDmSFI1DQCGgq09c2Bc3Je3Ci6XJHu+FP1F1pTnRzevv2WP8FSBJiTXpmJXdm6evB7V1Xxj4QlzQDvmHLRpBOL6PSttxf1Dc0IwC6BfZRN5g0dNmItNlS2pcY1MtZLxD5zpj",
"contentTopic":"ABC",
"version":1,
"timestamp":1647826358000000000
}
}
}*/
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const nx_json *json = nx_json_parse((char*) signal, 0);
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const char *type = nx_json_get(json, "type")->text_value;
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if (strcmp(type, "message") == 0)
{
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const nx_json *wakuMsgJson = nx_json_get(nx_json_get(json, "event"), "wakuMessage");
const char *contentTopic = nx_json_get(wakuMsgJson, "contentTopic")->text_value;
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if (strcmp(contentTopic, contentTopic) == 0)
{
char* msg = utils_extract_wakumessage_from_signal(wakuMsgJson);
WAKU_CALL(waku_decode_asymmetric(msg, bobPrivKey, handle_ok, handle_error));
char *decodedMsg = strdup(result);
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const nx_json *dataJson = nx_json_parse(decodedMsg, 0);
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const char *pubkey = nx_json_get(dataJson, "pubkey")->text_value;
const char *base64data = nx_json_get(dataJson, "data")->text_value;
size_t data_len = b64_decoded_size(base64data);
char *data = malloc(data_len);
b64_decode(base64data, (unsigned char *)data, data_len) ;
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printf(">>> Received \"%s\" from %s\n", data, pubkey);
fflush(stdout);
}
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}
nx_json_free(json);
}
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int main(int argc, char *argv[])
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{
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waku_set_event_callback(callBack);
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char *configJSON = "{\"host\": \"0.0.0.0\", \"port\": 60000, \"logLevel\":\"error\", \"store\":true}";
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WAKU_CALL( waku_new(configJSON, handle_error) ); // configJSON can be NULL too to use defaults
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WAKU_CALL(waku_start(handle_error) ); // Start the node, enabling the waku protocols
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WAKU_CALL(waku_peerid(handle_ok, handle_error)); // Obtain the node peerID
char *peerID = strdup(result);
printf("PeerID: %s\n", result);
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WAKU_CALL(waku_content_topic("example", 1, "default", "rfc26", handle_ok));
contentTopic = strdup(result);
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WAKU_CALL(waku_connect("/dns4/node-01.gc-us-central1-a.wakuv2.test.statusim.net/tcp/30303/p2p/16Uiu2HAmJb2e28qLXxT5kZxVUUoJt72EMzNGXB47Rxx5hw3q4YjS", 0, handle_error)); // Connect to a node
// To use dns discovery, and retrieve nodes from a enrtree url
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WAKU_CALL( waku_dns_discovery("enrtree://AOGECG2SPND25EEFMAJ5WF3KSGJNSGV356DSTL2YVLLZWIV6SAYBM@test.waku.nodes.status.im", "", 0, handle_ok, handle_error)); // Discover Nodes
printf("Discovered nodes: %s\n", result);
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WAKU_CALL(waku_default_pubsub_topic(handle_ok));
char *pubsubTopic = strdup(result);
printf("Default pubsub topic: %s\n", pubsubTopic);
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// To see a store query in action:
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/*
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char query[1000];
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sprintf(query, "{\"pubsubTopic\":\"%s\", \"pagingOptions\":{\"pageSize\": 40, \"forward\":false}}", pubsubTopic);
WAKU_CALL(waku_store_query(query, NULL, 0, handle_ok, handle_error));
printf("%s\n",result);
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*/
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WAKU_CALL( waku_relay_subscribe(NULL, handle_error));
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int i = 0;
int version = 1;
while (i < 5)
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{
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i++;
char wakuMsg[1000];
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char *msgPayload = b64_encode("Hello World!", 12);
sprintf(wakuMsg, "{\"payload\":\"%s\",\"contentTopic\":\"%s\",\"timestamp\":%"PRIu64"}", msgPayload, contentTopic, nowInNanosecs());
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free(msgPayload);
WAKU_CALL(waku_encode_asymmetric(wakuMsg, bobPubKey, alicePrivKey, handle_ok, handle_error));
char *encodedMessage = strdup(result);
WAKU_CALL(waku_relay_publish(encodedMessage, NULL, 0, handle_ok, handle_error)); // Broadcast via waku relay
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printf("C\n");
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char *messageID = strdup(result);
printf("MessageID: %s\n",messageID);
free(messageID);
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sleep(1);
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}
// To retrieve messages from local store, set store:true in the node config, and use waku_store_local_query
/*
char query[1000];
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sprintf(query, "{\"pubsubTopic\":\"%s\", \"pagingOptions\":{\"pageSize\": 40, \"forward\":false}}", pubsubTopic);
WAKU_CALL(waku_store_local_query(query, handle_ok, handle_error));
printf("%s\n",result);
*/
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WAKU_CALL(waku_stop(handle_error));
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return 0;
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}