sys.exit(-30)
faulty = True
# OK.. got the response - finish with daemon
break
elif dtnapi.dtn_errno(dtn_handle) != dtnapi.DTN_ETIMEOUT:
if verbose:
print(dtnapi.dtn_strerror(dtnapi.dtn_errno(dtn_handle)))
sys.exit(-21)
else:
if verbose:
print("dtn_recv timed out without receiving response bundle")
sys.exit(1)
dtnapi.dtn_close(dtn_handle)
debug("get_via_dtn completed")
return (json_dict, got_content, faulty)
#-------------------------------------------------------------------------------#
def py_nigetalt():
"""
@brief Command line program to perform a NetInf 'get' operation using http
@brief convergence layer.
Uses NIproc global instance of NI operations class
Run:
> nigetalt.py --help
def publish_with_dtn(ni_name, destination, authority, hash_alg, ext_json, locs,
scheme, full_put, file_name, rform, verbose):
"""
@brief Action a NetInf publish request using the HTTP convergence layer
@param ni_name NIname object instance or None - ni URI to publish if
given on comand line - otherwise will be constructed
@param destination string netloc (FQDN or IP address with optional port)
indicating where to send publish request
@param authority string netloc component to insert into ni name (may be "")
@param hash_alg string name of hash algorithm used for ni URI
@param ext_json dictionary additional information to send with request if any
in the form of a JSON dictionary or None
@param locs list of strings with locators to publish - maybe None
@param scheme URI scheme used for ni URI
@param full_put boolean True if the file_name with the content was given
@param file_name string name of file to publish or None if only doing metadata
@param rform string request format of response
@param verbose bolean indicates how much error message output is produced
@return 2-tuple - target - string the actual ni name published
payload - string - the response received on publication
"""
debug("Publishing via: %s" % destination)
# Handle full_put = True cases - we have a file with the octets in it
if full_put:
if ni_name is None:
# Make a ni_name template from specified components
ni_name = NIname((scheme, authority, "/%s" % hash_alg))
# Construct the digest from the file name and the template
rv = NIproc.makenif(ni_name, file_name)
if rv != ni_errs.niSUCCESS:
raise PublishFailure("Unable to construct digest of file %s: %s" %
(file_name, ni_errs_txt[rv]), -20)
else:
# Check the ni_name and the file match
rv = Niproc.checknif(ni_name, file_name)
if rv != ni_errs.niSUCCESS:
raise PublishFailure("Digest of file %s does not match ni_name %s: %s" %
(file_name,
ni_name.get_url(),
ni_errs_txt[rv]), -21)
# Guess the mimetype of the file
m = magic.Magic(mime=True)
ctype = m.from_file(file_name)
debug("Content-Type: %s" % ctype)
if ctype is None:
# Guessing didn't work - default
ctype = "application/octet-stream"
else:
ctype = None
target = ni_name.get_canonical_ni_url()
debug("Using URI string: %s" % target)
# Add extra items to ext_json to pass across as metadata
ext_json["ni"] = target
if ctype is not None:
ext_json["ct"] = ctype
if authority != "":
ext_json["http_auth"] = authority
# Send at most two locators as a list
if (locs is not None):
ext_json["loclist"] = locs[:2]
ext_json["fullPut"] = full_put
ext_json["rform"] = rform
# Create a connection to the DTN daemon
dtn_handle = dtnapi.dtn_open()
if dtn_handle == -1:
raise PublishFailure("Error: unable to open connection with DTN daemon",
-22)
# Generate EID + service tag for service to be accessed via DTN
if destination is None:
remote_service_eid = \
dtnapi.dtn_build_local_eid(dtn_handle,
"netinfproto/service/publish")
i = remote_service_eid.find("/netinfproto")
destination = remote_service_eid[:i]
else:
remote_service_eid = destination + "/netinfproto/service/publish"
# Add destination to locs if it isn't there already
if locs is None:
locs = []
if destination not in locs:
locs.append(destination)
# Generate the EID and service tag for this service
local_service_eid = dtnapi.dtn_build_local_eid(dtn_handle,
"netinfproto/app/response")
debug("Local Service EID: %s" % local_service_eid)
debug("Remote Service EID: %s" % remote_service_eid)
# Check if service_eid registration exists and register if not
# Otherwise bind to the existing registration
regid = dtnapi.dtn_find_registration(dtn_handle, local_service_eid)
if (regid == -1):
# Need to register the EID.. make it permanent with 'DEFER'
# characteristics so that bundles are saved if they arrive
# while the handler is inactive
# Expire the registration an hour in the future
exp = 60 * 60
# The registration is immediately active
passive = False
# We don't want to execute a script
script = ""
regid = dtnapi.dtn_register(dtn_handle, local_service_eid,
dtnapi.DTN_REG_DEFER,
exp, passive, script)
else:
dtnapi.dtn_bind(dtn_handle, regid)
# Build the bundle to send
# First a suitable BPQ block
bpq = BPQ()
bpq.set_bpq_kind(BPQ.BPQ_BLOCK_KIND_PUBLISH)
bpq.set_matching_rule(BPQ.BPQ_MATCHING_RULE_EXACT)
bpq.set_src_eid(local_service_eid)
sent_msgid = str(random.randint(1, 32000))
bpq.set_bpq_id(sent_msgid)
bpq.set_bpq_val(target)
bpq.clear_frag_desc()
# Build an extension blocks structure to hold the block
ext_blocks = dtnapi.dtn_extension_block_list(1)
# Construct the extension block
bpq_block = dtnapi.dtn_extension_block()
bpq_block.type = QUERY_EXTENSION_BLOCK
bpq_block.flags = 0
bpq_block.data = bpq.build_for_net()
ext_blocks.blocks.append(bpq_block)
# Build an extension blocks structure to hold the block
meta_blocks = dtnapi.dtn_extension_block_list(2)
# Build a metadata block for JSON data
md = Metadata()
md.set_ontology(Metadata.ONTOLOGY_JSON)
md.set_ontology_data(json.dumps(ext_json))
json_block = dtnapi.dtn_extension_block()
json_block.type = METADATA_BLOCK
json_block.flags = 0
json_block.data = md.build_for_net()
meta_blocks.blocks.append(json_block)
# Set up payload and placeholder if needed
if full_put:
# No placeholder required (obviously!)
pt = dtnapi.DTN_PAYLOAD_FILE
pv = file_name
else:
# DTN bundle always has a payload - distinguish
# zero length file form no content available
# Payload is the empty string sent via memory
pt = dtnapi.DTN_PAYLOAD_MEM
pv = ""
# Add a payload placeholder metablock
md = Metadata()
md.set_ontology(Metadata.ONTOLOGY_PAYLOAD_PLACEHOLDER)
md.set_ontology_data("No content supplied")
pp_block = dtnapi.dtn_extension_block()
pp_block.type = METADATA_BLOCK
pp_block.flags = 0
pp_block.data = md.build_for_net()
meta_blocks.blocks.append(pp_block)
# We want delivery reports and publication reports
# (and maybe deletion reports?)
dopts = dtnapi.DOPTS_DELIVERY_RCPT | dtnapi.DOPTS_PUBLICATION_RCPT
# - Send with normal priority.
pri = dtnapi.COS_NORMAL
# NetInf bundles should last a while..
exp = (24 *60 * 60)
# Send the bundle
bundle_id = dtnapi.dtn_send(dtn_handle, regid, local_service_eid,
remote_service_eid, local_service_eid,
pri, dopts, exp, pt, pv,
ext_blocks, meta_blocks, "", "")
if bundle_id == None:
raise PublishFailure("dtn_send failed - %s" %
dtnapi.dtn_strerror(dtnapi.dtn_errno(dtn_handle)),
-23)
# Wait for a reponse - maybe also some reports
while(True):
# NOTE: BUG in dtnapi - timeout is in msecs
recv_timeout = 2000 * 60
bpq_bundle = dtnapi.dtn_recv(dtn_handle, dtnapi.DTN_PAYLOAD_FILE,
recv_timeout)
# If bpq_bundle is None then either the dtn_recv timed out or
# there was some other error.
if bpq_bundle != None:
# Filter out report bundles
if bpq_bundle.status_report != None:
debug("Received status report")
if bpq_bundle.status_report.flags == dtnapi.STATUS_DELIVERED:
if verbose:
print("Received delivery report re from %s sent %d seq %d" %
(bpq_bundle.status_report.bundle_id.source,
bpq_bundle.status_report.bundle_id.creation_secs,
bpq_bundle.status_report.bundle_id.creation_seqno))
elif bpq_bundle.status_report.flags == dtnapi.STATUS_DELETED:
if verbose:
print("Received deletion report re from %s sent %d seq %d" %
(bpq_bundle.status_report.bundle_id.source,
bpq_bundle.status_report.bundle_id.creation_secs,
bpq_bundle.status_report.bundle_id.creation_seqno))
elif bpq_bundle.status_report.flags == dtnapi.STATUS_PUBLISHED:
if verbose:
print("Received publication report re from %s sent %d seq %d" %
(bpq_bundle.status_report.bundle_id.source,
bpq_bundle.status_report.bundle_id.creation_secs,
bpq_bundle.status_report.bundle_id.creation_seqno))
else:
if verbose:
print("Received unexpected report: Flags: %d" %
bpq_bundle.status_report.flags)
# Wait for more status reports and incoming response
continue
# Check the payload really is in a file
if not bpq_bundle.payload_file:
raise PublishFailure("Received bundle payload not in file - "
"ignoring bundle", -24)
# Have to delete this file before an error exit or if empty
pfn = bpq_bundle.payload
l = len(pfn)
if pfn[l-1] == "\x00":
pfn = pfn[:-1]
debug("Got incoming bundle with response in file %s" % pfn)
# Does the bundle have a BPQ block
bpq_data = None
if bpq_bundle.extension_cnt == 0:
os.remove(pfn)
raise PublishFailure("Error: Received bundle with no "
"extension block.", -25)
for blk in bpq_bundle.extension_blks:
if blk.type == QUERY_EXTENSION_BLOCK:
bpq_data = BPQ()
if not bpq_data.init_from_net(blk.data):
os.remove(pfn)
raise PublishFailure("Error: Bad BPQ block received",
-26)
if bpq_data is None:
os.remove(pfn)
raise PublishFailure("Error: Received bundle with no BPQ block "
"in extension blocks", -27)
debug(bpq_data)
# OK.. got the response - finish with daemon
break
elif dtnapi.dtn_errno(dtn_handle) != dtnapi.DTN_ETIMEOUT:
raise PublishFailure(dtnapi.dtn_strerror(dtnapi.dtn_errno(dtn_handle)),
-28)
else:
raise PublishFailure("dtn_recv timed out without receiving "
"response bundle", 1)
dtnapi.dtn_close(dtn_handle)
# Check the BPQ data is right
bpq.set_bpq_kind(BPQ.BPQ_BLOCK_KIND_PUBLISH)
bpq.set_matching_rule(BPQ.BPQ_MATCHING_RULE_EXACT)
if bpq_data.bpq_kind != BPQ.BPQ_BLOCK_KIND_PUBLISH:
raise PublishFailure("Returned BPQ block is not PUBLISH kind: %d" %
bpq_data.bpq_kind, -29)
if bpq_data.matching_rule != BPQ.BPQ_MATCHING_RULE_NEVER:
raise PublishFailure("Returned BPQ block does not have NEVER matching rule: %d" %
bpq_data.matching_rule, -30)
if bpq_data.bpq_id != sent_msgid:
raise PublishFailure("Returned BPQ block has unmatched msgis %s vs %s" %
(bpq_data.bpq_id, sent_msgid), -31)
# Verify the format of the response (a bit)
try:
pfd = open(pfn, "rb")
payload = pfd.read()
pfd.close()
os.remove(pfn)
except Exception, e:
raise PublishFailure("Failed to read response from payload file %s" %
pfn, -32)
