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import subprocess
from . import base
class ViewProtobuf(base.View):
"""Human friendly view of protocol buffers
The view uses the protoc compiler to decode the binary
"""
name = "Protocol Buffer"
prompt = ("protobuf", "p")
content_types = [
"application/x-protobuf",
"application/x-protobuffer",
]
def is_available(self):
try:
p = subprocess.Popen(
["protoc", "--version"],
stdout=subprocess.PIPE
)
out, _ = p.communicate()
return out.startswith(b"libprotoc")
except:
return False
def __call__(self, data, **metadata):
if not self.is_available():
raise NotImplementedError("protoc not found. Please make sure 'protoc' is available in $PATH.")
# if Popen raises OSError, it will be caught in
# get_content_view and fall back to Raw
p = subprocess.Popen(['protoc', '--decode_raw'],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
decoded, _ = p.communicate(input=data)
if not decoded:
raise ValueError("Failed to parse input.")
return "Protobuf", base.format_text(decoded)
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