Merge pull request #113 from multiformats/fix/conflict

Fix swarm codec conflict and add CI

.travis.yml

@@ -0,0 +1,9 @@
+sudo: false
+
+language: python
+
+python:
+  - "3.6"
+
+script:
+  - python validate.py

table.csv

@@ -432,6 +432,6 @@ torrent-file,         Torrent file (bencoded),                          0x7c
 ed25519-pub,          Ed25519 public key,                               0xed
 
 Content Namespaces,,
-ipld-ns,              IPLD path,                                        0xee
-ipfs-ns,              IPFS path,                                        0xef
-swarm-ns,             Swarm path,                                       0xf0
+ipld-ns,              IPLD path,                                        0xe2
+ipfs-ns,              IPFS path,                                        0xe3
+swarm-ns,             Swarm path,                                       0xe4

validate.py

@@ -0,0 +1,84 @@
+#!/usr/bin/python3
+
+import csv
+import sys
+
+# We have some duplicates
+ALIAS_TABLE = [
+    {"ipfs", "p2p"},
+]
+
+def check(fname='table.csv'):
+    class CheckError(Exception):
+        pass
+
+    aliases = {}
+    for nameset in ALIAS_TABLE:
+        for name in nameset:
+            aliases[name] = nameset
+
+    success = True
+    with open(fname) as table:
+        tablereader = csv.reader(table, skipinitialspace=True)
+        codes = {}
+        names = {}
+        for line, row in enumerate(tablereader):
+            # Skip the header
+            if line == 0:
+                continue
+
+            try:
+                # Skip empty rows
+                if not row:
+                    continue
+
+                # Check for invalid rows
+                if len(row) != 3:
+                    raise CheckError(f"expected 3 items, got {len(row)}")
+
+                # Skip section headers
+                if not row[1] and not row[2]:
+                    continue
+
+                # Check code format
+                if not row[2].startswith("0x"):
+                    raise CheckError(f"code '{row[2]}' doesn't start with 0x")
+
+                name = row[0]
+                if not name:
+                    raise CheckError(f"empty protocol name")
+
+                # Parse the code
+                try:
+                    code = int(row[2], 16)
+                except Exception as e:
+                    raise CheckError(f"failed to parse number '{row[2]}': {e}")
+
+                # Finally, check for duplicates
+
+                if name in names:
+                    raise CheckError(f"found duplicate {name}: {code} and {names[name]}")
+                else:
+                    names[name] = code
+
+                if code in codes:
+                    dup = codes[code]
+                    if name in aliases:
+                        if dup in aliases[name]:
+                            # Skip aliased names
+                            continue
+                    raise CheckError(
+                        f"found duplicate for code {hex(code)} "
+                        f"for '{codes[code]}' and '{name}'"
+                    )
+                else:
+                    codes[code] = name
+            except CheckError as e:
+                success = False
+                print(f"row {line}: {e}", file=sys.stderr)
+
+    return success
+
+if __name__ == "__main__":
+    if not check():
+        sys.exit(1)