mattupstate

Decorator vs ASGI Spec Middleware with FastAPI and ddtrace Correlation

This illustrates something unexpected about middleware with FastAPI and ddtrace. Below is are two examples of the log output from the minimal application provided here. The first being the log output when the decorator style middleware is added. The second when the decorator style middleware is removed, notice the trace and span ID values are 0. The question is, what is going such that the trace/span ID is only available in the ASGI spec when the decorator style is also applied.

mattupstate

declare module 'humio' {
  interface Options {
    ssl?: boolean;
    host: string;
    port: number;
    basePath?: string;
    dataspaceId?: string;
    sessionId?: string;
    includeClientMetadata?: boolean;
    includeSessionId?: boolean;

mattupstate

resource "aws_db_instance" "core" {
    username = "postgres"
    password = "changeme"
    ...
}

resource "null_resource" "master_password" {
    triggers {
        db_host = "${aws_db_instance.address}"
    }

mattupstate

#!/usr/bin/env python

import argparse
import sys

try:
    import boto3
except ImportError:
    print('Please install boto3 to use this tool')
    sys.exit(1)

mattupstate

Keybase proof

I hereby claim:

• I am mattupstate on github.
• I am mattupstate (https://keybase.io/mattupstate) on keybase.
• I have a public key whose fingerprint is 141F 4546 6A68 8F3D D2C7 0603 28D4 7F5D D3BC 77D5

To claim this, I am signing this object:

mattupstate

Timestamp:	2015-05-19 23:11:38.372266224 +0000 UTC
Type:	heka.statmetric
Hostname:	machine1
Pid:	18895
Uuid:	f58719a6-999f-465b-8790-13fae230c0ca
Logger:	users-frontend-stat-accum
Payload:	users-frontend-machine1.counters.uwsgi.worker.1.delta_requests.rate 0.000000 1432077098

users-frontend-machine1.counters.uwsgi.worker.1.delta_requests.count 0 1432077098 users-frontend-machine1.counters.uwsgi.worker.2.delta_requests.rate 0.000000 1432077098 users-frontend-machine1.counters.uwsgi.worker.2.delta_requests.count 0 1432077098

mattupstate

#!/usr/bin/python
# -*- coding: utf-8 -*-

try:
    import boto
    from boto import cloudformation
    HAS_BOTO = True
except ImportError:
    HAS_BOTO = False

mattupstate

#!/usr/bin/env python3
"""
Renders a partial SSH configuration file from Nodes and Services
located in a specified Consul catalog and then merges other partial
config files into the main ~/.ssh/config file. The Consul based SSH
config follows a convention for the SSH host::

    Host <consul-cluster-name>-<service-name>-<node-address>
        User <ssh-user>
        Hostname <consul-node-address>

mattupstate

from dictalchemy import make_class_dictable
from flask import Flask, request, jsonify, json
from flask_sqlalchemy import SQLAlchemy
from jsonpatch import JsonPatch, JsonPatchException

app = Flask(__name__)
app.debug = True
db = SQLAlchemy(app)
make_class_dictable(db.Model)

mattupstate

import string
import uuid

alphabet = string.digits + string.ascii_letters

def base62_encode(n):
    ret = ''
    while n > 0:
        ret = alphabet[n % 62] + ret
        n /= 62