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< h1 > Python API bindings< / h1 >
< p > The Python binding should be complete and are mostly automatically
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generated from the formal description of the API in xml. The bindings are
articulated around 2 classes < code > virConnect< / code > and virDomain mapping to
the C types. Functions in the C API taking either type as argument then
becomes methods for the classes, their name is just stripped from the
virConnect or virDomain(Get) prefix and the first letter gets converted to
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lower case, for example the C functions:< / p >
< p >
< code > int < a href = "html/libvirt-libvirt.html#virConnectNumOfDomains" > virConnectNumOfDomains< / a >
(virConnectPtr conn);< / code >
< / p >
< p >
< code > int < a href = "html/libvirt-libvirt.html#virDomainSetMaxMemory" > virDomainSetMaxMemory< / a >
(virDomainPtr domain, unsigned long memory);< / code >
< / p >
< p > become< / p >
< p >
< code > virConn::numOfDomains(self)< / code >
< / p >
< p >
< code > virDomain::setMaxMemory(self, memory)< / code >
< / p >
< p > This process is fully automated, you can get a summary of the conversion
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in the file libvirtclass.txt present in the python dir or in the docs.There
is a couple of function who don't map directly to their C counterparts due to
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specificities in their argument conversions:< / p >
< ul > < li > < code > < a href = "html/libvirt-libvirt.html#virConnectListDomains" > virConnectListDomains< / a > < / code >
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is replaced by < code > virDomain::listDomainsID(self)< / code > which returns
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a list of the integer ID for the currently running domains< / li > < li > < code > < a href = "html/libvirt-libvirt.html#virDomainGetInfo" > virDomainGetInfo< / a > < / code >
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is replaced by < code > virDomain::info()< / code > which returns a list of
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< ol > < li > state: one of the state values (virDomainState)< / li > < li > maxMemory: the maximum memory used by the domain< / li > < li > memory: the current amount of memory used by the domain< / li > < li > nbVirtCPU: the number of virtual CPU< / li > < li > cpuTime: the time used by the domain in nanoseconds< / li > < / ol > < / li > < / ul >
< p > So let's look at a simple example inspired from the < code > basic.py< / code >
test found in < code > python/tests/< / code > in the source tree:< / p >
< pre > import < span style = "color: #0071FF; background-color: #FFFFFF" > libvirt< / span >
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import sys
conn = < span style = "color: #0071FF; background-color: #FFFFFF" > libvirt< / span > .openReadOnly(None)
if conn == None:
print 'Failed to open connection to the hypervisor'
sys.exit(1)
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try:
dom0 = conn.< span style = "color: #007F00; background-color: #FFFFFF" > lookupByName< / span > ("Domain-0")
except:
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print 'Failed to find the main domain'
sys.exit(1)
print "Domain 0: id %d running %s" % (dom0.< span style = "color: #FF0080; background-color: #FFFFFF" > ID< / span > (), dom0.< span style = "color: #FF0080; background-color: #FFFFFF" > OSType< / span > ())
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print dom0.< span style = "color: #FF0080; background-color: #FFFFFF" > info< / span > ()< / pre >
< p > There is not much to comment about it, it really is a straight mapping
from the C API, the only points to notice are:< / p >
< ul > < li > the import of the module called < code > < span style = "color: #0071FF; background-color: #FFFFFF" > libvirt< / span > < / code > < / li > < li > getting a connection to the hypervisor, in that case using the
openReadOnly function allows the code to execute as a normal user.< / li > < li > getting an object representing the Domain 0 using < span style = "color: #007F00; background-color: #FFFFFF" > lookupByName< / span > < / li > < li > if the domain is not found a libvirtError exception will be raised< / li > < li > extracting and printing some information about the domain using
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various < span style = "color: #E50073; background-color: #FFFFFF" > methods< / span >
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associated to the virDomain class.< / li > < / ul >
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