8:14 p.m.
Added a picture and explanation describing the virConnectOpen processing
at a "higher" level, but with some source code references.
---
docs/internals.html.in | 102 ++++++++++++++++++++++++++++++++++--
docs/libvirt-virConnect-example.fig | 58 ++++++++++++++++++++
docs/libvirt-virConnect-example.png | Bin 0 -> 10464 bytes
3 files changed, 156 insertions(+), 4 deletions(-)
create mode 100644 docs/libvirt-virConnect-example.fig
create mode 100644 docs/libvirt-virConnect-example.png
diff --git a/docs/internals.html.in b/docs/internals.html.in
index 5689998..90143ef 100644
--- a/docs/internals.html.in
+++ b/docs/internals.html.in
@@ -9,12 +9,106 @@
</p>
<ul>
- <li>Introduction to basic rules and guidelines for <a
href="hacking.html">hacking</a>
- on libvirt code</li>
+ <li>Introduction to basic rules and guidelines for
+ <a href="hacking.html">hacking</a> on libvirt
code</li>
<li>Guide to adding <a href="api_extension.html">public
APIs</a></li>
- <li>Approach for <a href="internals/command.html">spawning
commands</a> from
- libvirt driver code</li>
+ <li>Approach for <a href="internals/command.html">spawning
commands</a>
+ from libvirt driver code</li>
+ <li>The libvirt <a href="internals/rpc.html">RPC
infrastructure</a></li>
+ <li>The <a href="internals/locking.html">Resource Lock
Manager</a></li>
</ul>
+ <p>Before adding new code it will be important to get a basic understanding
+ of the many elements involved with making any call or change to the libvirt
+ code. The architecture <a href="goals.html">goals</a> must be
adhered to
+ when submitting new code. Understanding the many places that need to be
+ touched and the interactions between various subsystems within libvirt
+ will directly correlate to the ability to be successful in getting new
+ code accepted.</p>
+ <p>The following diagram depicts code flow from a client application, in
+ this case the libvirt provided <code>virsh</code> command through the
+ various layers to elicit a response from some chosen hypervisor.
+ </p>
+
+ <p class="image">
+ <img alt="virConnectOpen calling sequence"
+ src="libvirt-virConnect-example.png"/>
+ </p>
+ <ul>
+ <li>"virsh -c qemu:///system list --all"
+ <p>After the virsh code processes the input arguments, it eventually
+ will make a call to open the connection using a default set of
+ authentication credentials (virConnectAuthDefault). </p></li>
+ <li>virConnectOpenAuth()
+ <p>Each of the virConnectOpen APIs will first call virInitialize() and
+ then revector through the local "do_open():" call.</p>
+ <ul>
+ <li>virInitialize()
+ <p>Calls the registration API for each of the drivers with
+ client-side only capabilities and then call the remoteRegister()
+ API last. This ensures the virDriverTab[] tries local drivers
+ first before using the remote driver.</p></li>
+ <li>Loop through virDriverTab[] entries trying to call their
+ respective "open" entry point (in our case
remoteOpen())</li>
+ <li>After successful return from the virDriverTab[] open()
+ API, attempt to find and open other drivers (network, interface,
+ storage, etc.)</li>
+ </ul>
+ </li>
+ <li>remoteOpen()
+ <p>After a couple of URI checks, a call to doRemoteOpen() is
made</p>
+ <ul>
+ <li>Determine network transport and host/port to use from URI
+ <p>The transport will be either tls, unix, ssh, libssh2, ext,
+ or tcp with the default of tls. Decode the host/port if provided
+ or default to "localhost".</p></li>
+ <li>virNetClientRegisterAsyncIO()
+ <p>Register an I/O callback mechanism to get returned data via
+ virNetClientIncomingEvent()</p></li>
+ <li>"call(...REMOTE_PROC_OPEN...)"
+ <p>Eventually routes into virNetClientProgramCall() which will
+ call virNetClientSendWithReply() and eventually uses
+ virNetClientIO()to send the message to libvirtd and
+ then waits for a response using
virNetClientIOEventLoop()</p></li>
+ <li>virNetClientIncomingEvent()
+ <p>Receives the returned packet and processes through
+ virNetClientIOUpdateCallback()</p></li>
+ </ul>
+ </li>
+ <li>libvirtd Daemon
+ <p></p>
+ <ul>
+ <li>Daemon Startup
+ <p>The daemon initialization processing will declare itself
+ as a server via a virNetServerNew() call, then use
+ virDriverLoadModule() to find/load all known drivers,
+ set up an RPC server program using the
<code>remoteProcs[]</code>
+ table via a virNetServerProgramNew() call. The table is the
+ corollary to the <code>remote_procedure</code> enum list in
+ the client. It lists all the functions to be called in
+ the same order. Once RPC is set up, networking server sockets
+ are opened, the various driver state initialization routines
+ are run from the <code>virStateDriverTab[]</code>, the network
+ links are enabled, and the daemon waits for work.</p></li>
+ <li>RPC
+ <p>When a message is received, the
<code>remoteProcs[]</code>
+ table is referenced for the 'REMOTE_PROC_OPEN' call entry.
+ This results in remoteDispatchOpen() being called via the
+ virNetServerProgramDispatchCall().</p></li>
+ <li>remoteDispatchOpen()
+ <p>The API will read the argument passed picking out the
+ <code>name</code> of the driver to be opened. The code
+ will then call virConnectOpen() or virConnectOpenReadOnly()
+ depending on the argument
<code>flags</code>.</p></li>
+ <li>virConnectOpen() or virConnectOpenReadOnly()
+ <p>Just like the client except that upon entry the URI
+ is what was passed from the client and will be found
+ and opened to process the data.</p>
+ <p>The returned structure data is returned via the
+ virNetServer interfaces to the remote driver which then
+ returns it to the client application.</p></li>
+ </ul>
+ </li>
+ </ul>
</body>
</html>
diff --git a/docs/libvirt-virConnect-example.fig b/docs/libvirt-virConnect-example.fig
new file mode 100644
index 0000000..2936f22
--- /dev/null
+++ b/docs/libvirt-virConnect-example.fig
@@ -0,0 +1,58 @@
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+4 0 0 50 -1 16 24 0.0000 4 135 720 9750 825 libvirtd\001
diff --git a/docs/libvirt-virConnect-example.png b/docs/libvirt-virConnect-example.png
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--
1.7.11.7