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Add basic support for replica set connections #2690

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Add basic support for replica set connections #2690

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9ffda97
extract the connection code to a new method
gedaiu Sep 12, 2022
c66b438
Add basic support for replica set connections
gedaiu Sep 12, 2022
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50 changes: 40 additions & 10 deletions mongodb/vibe/db/mongo/connection.d
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Original file line number Diff line number Diff line change
Expand Up @@ -147,23 +147,17 @@ final class MongoConnection {
this(MongoClientSettings cfg)
{
m_settings = cfg;

// Now let's check for features that are not yet supported.
if(m_settings.hosts.length > 1)
logWarn("Multiple mongodb hosts are not yet supported. Using first one: %s:%s",
m_settings.hosts[0].name, m_settings.hosts[0].port);
}

void connect()
{
void connectToHost(MongoHost host) {
bool isTLS;

/*
* TODO: Connect to one of the specified hosts taking into consideration
* options such as connect timeouts and so on.
*/
try {
m_conn = connectTCP(m_settings.hosts[0].name, m_settings.hosts[0].port);
m_conn = connectTCP(host.name, host.port);
m_conn.tcpNoDelay = true;
if (m_settings.ssl) {
auto ctx = createTLSContext(TLSContextKind.client);
Expand All @@ -178,7 +172,7 @@ final class MongoConnection {
ctx.useTrustedCertificateFile(m_settings.sslCAFile);
}

m_stream = createTLSStream(m_conn, ctx, m_settings.hosts[0].name);
m_stream = createTLSStream(m_conn, ctx, host.name);
isTLS = true;
}
else {
Expand All @@ -187,7 +181,7 @@ final class MongoConnection {
m_outRange = streamOutputRange(m_stream);
}
catch (Exception e) {
throw new MongoDriverException(format("Failed to connect to MongoDB server at %s:%s.", m_settings.hosts[0].name, m_settings.hosts[0].port), __FILE__, __LINE__, e);
throw new MongoDriverException(format("Failed to connect to MongoDB server at %s:%s.", host.name, host.port), __FILE__, __LINE__, e);
}

m_allowReconnect = false;
Expand Down Expand Up @@ -272,6 +266,40 @@ final class MongoConnection {
authenticate();
break;
}

logInfo("Connected to: %s master=%s secondary=%s", m_description.me, m_description.ismaster, m_description.secondary);
}

void connect()
{
Exception e;

foreach (host; m_settings.hosts) {
try {
connectToHost(host);
} catch(Exception ex) {
e = ex;
logError(e.msg);
}

if(!m_description.ismaster && m_description.secondary) {
logInfo("Connected to a secondary MongoDb node. The primary is: %s", m_description.primary);

auto split = m_description.primary.indexOf(":");

if(split != -1 && split < m_description.primary.length - 1) {
disconnect();
logInfo("Disconnected from the secondary MongoDb node.");

connectToHost(MongoHost(m_description.primary[0..split], m_description.primary[split+1..$].to!ushort));
return;
}
}
}

if(e !is null) {
throw e;
}
}

void disconnect()
Expand Down Expand Up @@ -746,6 +774,8 @@ struct ServerDescription
Nullable!int setVersion;
Nullable!BsonObjectID electionId;
string primary;
bool secondary;
bool ismaster;
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I couldn't find this in the documentation, is this an undocumented field, or am I just looking in the wrong place?

string lastUpdateTime = "infinity ago";
Nullable!int logicalSessionTimeoutMinutes;

Expand Down