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fix(i2p): move StartI2P to background thread — fixes splash screen freeze on first run

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i2p::api::StartI2P() calls NetDb::Start() which triggers Reseed() — a
blocking HTTPS download from public I2P reseed servers. On first run
(empty netDb), this blocks for up to 180s, freezing the GUI splash
screen on "Starting embedded I2P router..." indefinitely.

Fix: Move StartI2P + client::context.Start + SOCKS/SAM readiness polling
into a detached background thread. InitI2P (fast, <1s) remains
synchronous. The main init thread proceeds immediately — Tor-only mode
works while I2P bootstraps asynchronously (1-5 min for first run).

Verified: i2p_start startup perf dropped from 180s+ to 27ms on first run
with empty netDb. Reseed + tunnel building continues in background.
This commit is contained in:
Krystie
2026-06-30 13:58:38 -07:00
parent d4d0ddf849
commit ae7beb0df7
1 changed files with 100 additions and 108 deletions
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src/i2p/i2p_embedded.cpp
+100 -108
View File
@@ -495,145 +495,137 @@ bool CI2PEmbedded::Start(int socks, int sam, int server)
argvPtrs.push_back(nullptr);
try {
// Initialize i2pd: config parse, filesystem, crypto, router context
// ----------------------------------------------------------------
// Phase 1 (synchronous, < 1s): config parse, crypto, router context
// ----------------------------------------------------------------
i2p::api::InitI2P((int)(argvPtrs.size() - 1), argvPtrs.data(), "triangles-i2pd");
fflush(stdout);
// Start the I2P router: netdb, transports, tunnels, router context
// Redirect i2pd logs to our stdout/stderr
auto logStream = std::make_shared<std::ostream>(std::cout.rdbuf());
i2p::api::StartI2P(logStream);
fflush(stdout);
printf("Embedded I2P: router started, starting client services...\n");
fflush(stdout);
// Mark running EARLY so the Qt UI's IsRunning() check passes even if
// the SAM/SOCKS bootstrap loop below takes longer than expected.
// The status bar will show "building tunnels..." (yellow) instead of
// nothing while we wait for the .b32.i2p address.
// Mark running immediately so Qt UI shows I2P as active.
running.store(true);
// Start the client context — this initializes SAM bridge, SOCKS proxy,
// and tunnels based on config. The client context reads the conf we
// wrote above to determine which services to start.
i2p::client::context.Start();
printf("Embedded I2P: SOCKS proxy at 127.0.0.1:%d, SAM at 127.0.0.1:%d\n",
socksPort, samPort);
// ----------------------------------------------------------------
// Phase 2 (background thread): StartI2P + client context + bootstrap
//
// i2p::api::StartI2P() → NetDb::Start() → Reseed() can block for
// up to 180s on first run (empty netDb → HTTPS download from public
// I2P reseed servers). Running this on the main init thread freezes
// the GUI splash screen ("Starting embedded I2P router...").
//
// The background thread handles:
// 1. StartI2P (router, netdb, transports, tunnels, reseed)
// 2. client::context.Start (SAM bridge, SOCKS proxy, server tunnel)
// 3. Polling for SOCKS/SAM port readiness (up to 300s)
// 4. .b32.i2p address population
//
// Meanwhile, the main init proceeds immediately. Tor-only mode
// works in the meantime; I2P connectivity comes up asynchronously.
// ----------------------------------------------------------------
printf("Embedded I2P: launching router in background thread...\n");
fflush(stdout);
// Wait for i2pd's SOCKS proxy AND SAM bridge to become available
// (up to 120s — I2P bootstrap is slower than Tor due to floodfill
// lookup and tunnel build).
printf("Embedded I2P: waiting for SOCKS proxy and SAM bridge...\n");
bool socksReady = false;
bool samReady = false;
std::thread([this]() {
try {
// Start the I2P router (netdb, transports, tunnels, reseed)
auto logStream = std::make_shared<std::ostream>(std::cout.rdbuf());
i2p::api::StartI2P(logStream);
fflush(stdout);
for (int i = 0; i < 120; i++) {
MilliSleep(1000);
if (fShutdown) {
Stop();
return false;
}
printf("Embedded I2P: router started, starting client services...\n");
fflush(stdout);
// --- Check SOCKS proxy readiness ---
if (!socksReady) {
// Start SAM bridge, SOCKS proxy, and server tunnel
i2p::client::context.Start();
printf("Embedded I2P: SOCKS proxy at 127.0.0.1:%d, SAM at 127.0.0.1:%d\n",
socksPort, samPort);
fflush(stdout);
// Wait for SOCKS proxy + SAM bridge to become available
printf("Embedded I2P: waiting for SOCKS proxy and SAM bridge...\n");
bool socksReady = false;
bool samReady = false;
for (int i = 0; i < 300; i++) {
MilliSleep(1000);
if (fShutdown) {
Stop();
return;
}
if (!socksReady) {
#ifdef WIN32
SOCKET sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock != INVALID_SOCKET) {
SOCKET sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock != INVALID_SOCKET) {
#else
int sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock >= 0) {
int sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock >= 0) {
#endif
struct sockaddr_in addr;
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
addr.sin_port = htons(socksPort);
bool up = (connect(sock, (struct sockaddr*)&addr, sizeof(addr)) == 0);
struct sockaddr_in addr;
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
addr.sin_port = htons(socksPort);
bool up = (connect(sock, (struct sockaddr*)&addr, sizeof(addr)) == 0);
#ifdef WIN32
closesocket(sock);
closesocket(sock);
#else
close(sock);
close(sock);
#endif
if (up) {
socksReady = true;
printf("Embedded I2P: SOCKS proxy ready on port %d (took %ds)\n",
socksPort, i + 1);
if (up) {
socksReady = true;
printf("Embedded I2P: SOCKS proxy ready on port %d (took %ds)\n",
socksPort, i + 1);
}
}
}
if (!samReady) {
samReady = IsSamAvailable();
if (samReady) {
printf("Embedded I2P: SAM v3 bridge ready on port %d (took %ds)\n",
samPort, i + 1);
}
}
if (socksReady && samReady) {
printf("Embedded I2P: all I2P endpoints ready (SOCKS %d + SAM %d)\n",
socksPort, samPort);
break;
}
if (i > 0 && i % 30 == 0) {
printf("Embedded I2P: still bootstrapping (%ds elapsed, SOCKS:%s SAM:%s)...\n",
i, socksReady ? "ready" : "wait",
samReady ? "ready" : "wait");
}
}
}
// --- Check SAM bridge readiness ---
if (!samReady) {
samReady = IsSamAvailable();
if (samReady) {
printf("Embedded I2P: SAM v3 bridge ready on port %d (took %ds)\n",
samPort, i + 1);
}
}
// Both endpoints are up — router is fully bootstrapped
if (socksReady && samReady) {
printf("Embedded I2P: all I2P endpoints ready (SOCKS %d + SAM %d)\n",
socksPort, samPort);
break;
}
if (i > 0 && i % 30 == 0) {
printf("Embedded I2P: still bootstrapping (%ds elapsed, SOCKS:%s SAM:%s)...\n",
i, socksReady ? "ready" : "wait",
samReady ? "ready" : "wait");
}
}
// Populate the .b32.i2p address from the router's identity hash.
// This is the I2P address that appears in the Qt status bar.
//
// Try i2pd's API first; if that fails (e.g. router info not yet loaded,
// exception during base32 encoding), fall back to reading the
// router.info file directly from the datadir — i2pd writes it as part
// of its crypto initialization, so it's almost always present.
// Populate .b32.i2p address
try {
auto identHash = i2p::context.GetRouterInfo().GetIdentHash();
i2pHostname = identHash.ToBase32() + ".b32.i2p";
printf("Embedded I2P: router address = %s\n", i2pHostname.c_str());
} catch (...) {
printf("Embedded I2P: API ident lookup failed, trying router.info fallback...\n");
try {
fs::path routerInfoPath = fs::path(i2pDataDir) / "router.info";
if (fs::exists(routerInfoPath)) {
std::ifstream rf(routerInfoPath.string());
std::string content((std::istreambuf_iterator<char>(rf)),
std::istreambuf_iterator<char>());
// Look for the "identity=" line — base64 of the signing key
// The b32 address is derived from the SHA256 of this key,
// but for our purposes we use the simpler approach: parse
// the public key from the router.info and base32 it.
// i2pd's RouterInfo has a ToBase64() we can call directly.
size_t identPos = content.find("\"identity\"");
if (identPos != std::string::npos) {
printf("Embedded I2P: found identity in router.info (using SHA256-of-identity-hash for b32)\n");
// The .b32.i2p address is just the SHA256 of the
// router's identity, base32-encoded. Easiest path:
// re-read via i2pd's Identity/Keys API by loading
// the file. But for now, mark hostname as
// "pending" and let the Qt timer retry every 5s.
printf("Embedded I2P: router address not yet available, will retry from Qt timer\n");
}
}
} catch (...) {
printf("Embedded I2P: router.info fallback also failed\n");
}
printf("Embedded I2P: .b32.i2p address not yet available, Qt timer will retry\n");
}
fflush(stdout);
} catch (const std::exception& e) {
printf("ERROR: Embedded I2P background init failed: %s\n", e.what());
fflush(stdout);
}
}).detach();
printf("Embedded I2P: router init delegated to background thread\n");
fflush(stdout);
return true;
} catch (const std::exception& e) {
lastError = std::string("i2pd initialization failed: ") + e.what();
printf("ERROR: Embedded I2P startup failed: %s\n", e.what());
running.store(false);
return false;
}
}