salrashid123

git clone https://github.com/salrashid123/grpc_curl
cd grpc_curl/src/
virtualenv env --no-site-packages
source env/bin/activate
pip install grpcio-tools hexdump
python -m grpc_tools.protoc -I .  --python_out=. --grpc_python_out=. echo.proto

salrashid123

def w(filename):
  req = echo_pb2.EchoRequest(firstname='john', lastname='doe')
  msg = binascii.b2a_hex(req.SerializeToString())
  frame =  '00' + hex(len(msg)/2).lstrip("0x").zfill(8) + msg
  print 'Raw Encode: ' + frame
  f = open(filename, "wb+")
  f.write(binascii.a2b_hex(frame))
  f.close()

salrashid123

$ xxd frame.bin 
00000000: 0a04 6a6f 686e 1203 646f 65              ..john..doe
$ xxd -p frame.bin
0a046a6f686e1203646f65
$ echo `xxd -p frame.bin`  | xxd -r -p | protoc --decode_raw
1: "john"
2: "doe"

salrashid123

>>> msg = '0a046a6f686e1203646f65'
>>> print '00' + hex(len(msg)/2).lstrip("0x").zfill(8) + msg
000000000b0a046a6f686e1203646f65
echo -n '000000000b0a046a6f686e1203646f65' | xxd -r -p - frame.bin

salrashid123

Delimited-Message → Compressed-Flag Message-Length Message
Compressed-Flag → 0 / 1 # encoded as 1 byte unsigned integer
Message-Length → {length of Message} # encoded as 4 byte unsigned integer
Message → *{binary octet}

compression:
   00
message-length =>11(decimal) octets =>b(hex)
   0000000b
msg:

salrashid123

curl -v  -k --raw -X POST --http2  \
    -H "Content-Type: application/grpc" \
    -H "TE: trailers" \
    --data-binary @frame.bin \
    https://main.esodemoapp2.com:50051/echo.EchoServer/SayHello \
    -o resp.bin


nghttp -v -H ":method: POST" \
    -H "Content-Type: application/grpc" \

salrashid123

$ nslookup main.esodemoapp2.com 8.8.8.8
Server:		8.8.8.8
Address:	8.8.8.8#53
Non-authoritative answer:
Name:	main.esodemoapp2.com
Address: 127.0.0.1

$ openssl x509 -in server_crt.pem  -text -noout
  ...
   Subject: C=US, ST=California, O=Google, OU=Enterprise, CN=main.esodemoapp2.com

salrashid123

$ echo 0a1048656c6c6f2c206a6f686e20646f6521 | xxd -r -p | protoc --decode_raw
1: "Hello, john doe!"

salrashid123

$ python message_util.py read resp.bin 
Got wire_message: 00000000120a1048656c6c6f2c206a6f686e20646f6521
Proto Decode: Hello, john doe!


def r(filename):
  f = open(filename, "rb")
  wire_msg = binascii.b2a_hex(f.read())
  f.close()
  print 'Got wire_message: ' + wire_msg

salrashid123

xxd resp.bin 
00000000: 0000 0000 1f0a 1d53 7472 6561 6d69 6e67  .......Streaming
00000010: 2048 656c 6c6f 2031 202c 206a 6f68 6e20   Hello 1 , john 
00000020: 646f 6521 0000 0000 1e0a 1c53 7472 6561  doe!.......Strea
00000030: 6d69 6e67 2048 656c 6c6f 2032 2c20 6a6f  ming Hello 2, jo
00000040: 686e 2064 6f65 21                        hn doe!

$ xxd -p resp.bin 
000000001f
0a1d53747265616d696e672048656c6c6f2031202c206a6f686e20646f6521