Configuration

configure()

Call configure() before any Bloomberg request to set connection parameters, pool sizes, and auth. Once the engine starts on the first request, calling configure() again raises RuntimeError.

import xbbg
from xbbg import blp, EngineConfig

# Keyword arguments — most common
xbbg.configure(request_pool_size=4, subscription_pool_size=2)

# EngineConfig object
xbbg.configure(EngineConfig(request_pool_size=4, subscription_pool_size=2))

# EngineConfig + overrides (kwargs take precedence)
cfg = EngineConfig(request_pool_size=4)
xbbg.configure(cfg, subscription_pool_size=2)

configure() is also available on the blp module:

from xbbg import blp

blp.configure(host='192.168.1.100', port=18194)

WARNING

configure() must be called before the first Bloomberg request. Calling it after the engine has started raises RuntimeError: Cannot configure after engine has started.

---

Engine Architecture

xbbg runs a Rust async engine with pre-warmed worker pools:

┌─────────────────────────────────────────────────┐
│                   xbbg Engine                   │
│                                                 │
│  ┌──────────────────────┐  ┌─────────────────┐  │
│  │  Request Worker Pool │  │ Subscription    │  │
│  │  (request_pool_size) │  │ Session Pool    │  │
│  │                      │  │ (sub_pool_size) │  │
│  │  Worker 1 ──session  │  │                 │  │
│  │  Worker 2 ──session  │  │  Session 1      │  │
│  │  ...                 │  │  ...            │  │
│  └──────────────────────┘  └─────────────────┘  │
│           │ round-robin          │ isolated      │
│           ▼                      ▼               │
│    bdp/bdh/bds/bdib       subscribe/stream       │
│    bql/bsrch/beqs         vwap/mktbar/depth      │
└─────────────────────────────────────────────────┘

• Request workers each hold an independent Bloomberg session. Concurrent bdp/bdh/bds calls are dispatched round-robin. request_pool_size=4 allows 4 parallel Bloomberg requests.
• Subscription sessions are isolated per session to prevent cross-contamination between topic streams. Each subscribe() call gets its own session from the pool.
• Workers are pre-warmed at first use — sessions are started and services opened before your first request, eliminating cold-start latency.

---

EngineConfig Reference

Connection & Session

Parameter	Default	Description
host	'localhost'	Bloomberg server host for direct Terminal/B-PIPE TCP connections
port	8194	Bloomberg server port for direct Terminal/B-PIPE TCP connections
servers	[]	Ordered (host, port) failover list for direct TCP connections; do not combine with zfp_remote
zfp_remote	None	Bloomberg ZFP leased-line remote, either '8194' or '8196'; mutually exclusive with host/port/servers/SOCKS5 and requires TLS credentials
num_start_attempts	3	Retries before giving up on session start
auto_restart_on_disconnection	True	Auto-reconnect on session disconnect

Worker Pools

Parameter	Default	Description
request_pool_size	2	Number of pre-warmed request workers (parallel Bloomberg sessions for bdp/bdh/bds/etc.)
subscription_pool_size	1	Number of pre-warmed subscription sessions (isolated sessions for subscribe/stream)
warmup_services	['//blp/refdata', '//blp/apiflds']	Services to pre-open on startup

Subscription Tuning

Parameter	Default	Description
subscription_flush_threshold	1	Ticks buffered before flushing to Python. Increase for throughput; decrease for latency
subscription_stream_capacity	256	Backpressure buffer size per subscription stream
overflow_policy	'drop_newest'	Slow consumer policy: 'drop_newest' or 'block'

Internal Buffers

Parameter	Default	Description
max_event_queue_size	10000	Bloomberg SDK event queue depth
command_queue_size	256	Internal command channel capacity

Validation

Parameter	Default	Description
validation_mode	'disabled'	Field validation: 'disabled', 'strict' (reject unknown fields), or 'lenient' (warn)
field_cache_path	~/.xbbg/field_cache.json	Path for persistent field type cache

Authentication (SAPI / B-PIPE)

Parameter	Default	Description
auth_method	None	Auth mode: 'user', 'app', 'userapp', 'dir', 'manual', or 'token'
app_name	None	Application name (required for app, userapp, manual)
user_id	None	Bloomberg user ID (required for manual)
ip_address	None	Bloomberg IP address (required for manual)
dir_property	None	Active Directory property (required for dir)
token	None	Auth token (required for token)

---

Authentication Examples

B-PIPE app

from xbbg import blp

# Application auth — requires app name registered with Bloomberg
blp.configure(
    auth_method='app',
    app_name='myapp:8888',
    host='bpipe-host',
    port=8194,
)

manual (SAPI)

from xbbg import blp

# Manual auth — provides explicit Bloomberg user and IP
blp.configure(
    auth_method='manual',
    app_name='myapp',
    user_id='12345',
    ip_address='10.0.0.1',
)

dir

from xbbg import blp

# Active Directory auth — uses an AD property to identify the user
blp.configure(
    auth_method='dir',
    dir_property='mail',
)

token

from xbbg import blp

# Token auth
blp.configure(
    auth_method='token',
    token='<your-auth-token>',
)

---

Multi-Server Failover

Pass a list of (host, port) tuples to servers. When set, servers overrides host/port.

from xbbg import blp

blp.configure(
    servers=[
        ('bbg-primary.example.com', 8194),
        ('bbg-secondary.example.com', 8194),
    ]
)

Bloomberg will attempt servers in order and fall back on failure.

---

ZFP over Leased Lines

For Bloomberg Zero-Footprint (ZFP) connectivity over private leased lines, set zfp_remote to the remote string Bloomberg assigned for the leased-line path. Accepted values are '8194' and '8196'. xbbg delegates endpoint discovery to Bloomberg's ZfpUtil::getOptionsForLeasedLines, so you must not pass direct endpoint settings in the same configuration.

ZFP mode requires both TLS files: tls_client_credentials (client PKCS#12 file) and tls_trust_material (trust material file). The password is optional only if your client credentials file is not password-protected.

from xbbg import blp

blp.configure(
    zfp_remote='8194',
    tls_client_credentials='/secure/client.p12',
    tls_client_credentials_password='secret',
    tls_trust_material='/secure/trust.p7',
)

Do not combine zfp_remote with host, port, servers, socks5_host, or socks5_port. In ZFP mode those endpoint addresses are supplied by Bloomberg; passing direct endpoints now raises ValueError instead of silently trying localhost:8194.

To verify the session start path, enable SDK tracing before configure() and confirm the first transport lines contain Bloomberg infrastructure endpoints, not localhost or 127.0.0.1:

import xbbg
from xbbg import blp

xbbg.set_log_level('trace')
xbbg.enable_sdk_logging('trace')

blp.configure(
    zfp_remote='8194',
    tls_client_credentials='/secure/client.p12',
    tls_client_credentials_password='secret',
    tls_trust_material='/secure/trust.p7',
)
print(xbbg.is_connected())

---

TLS

Parameter	Default	Description
tls_client_credentials	None	Path to client certificate file (PKCS#12)
tls_client_credentials_password	None	Password for the client certificate
tls_trust_material	None	Path to trust store file (PKCS#12)
tls_handshake_timeout_ms	None	TLS handshake timeout in milliseconds
tls_crl_fetch_timeout_ms	None	CRL fetch timeout in milliseconds

from xbbg import blp

blp.configure(
    host='bbg-tls.example.com',
    tls_client_credentials='/certs/client.p12',
    tls_client_credentials_password='changeit',
    tls_trust_material='/certs/trust.p12',
    tls_handshake_timeout_ms=5000,
)

---

SOCKS5 Proxy

Route Bloomberg connections through a SOCKS5 proxy by setting both socks5_host and socks5_port.

Parameter	Default	Description
socks5_host	None	SOCKS5 proxy hostname
socks5_port	None	SOCKS5 proxy port (required when socks5_host is set)

from xbbg import blp

blp.configure(
    host='bbg-server.example.com',
    socks5_host='proxy.internal',
    socks5_port=1080,
)

---

Retry Policy

Retries apply to individual Bloomberg requests that fail transiently. Retry is disabled by default (retry_max_retries=0).

Parameter	Default	Description
retry_max_retries	0	Maximum retry attempts per request. 0 disables retry
retry_initial_delay_ms	1000	Delay before first retry (milliseconds)
retry_backoff_factor	2.0	Multiplier applied to delay after each retry
retry_max_delay_ms	30000	Maximum delay between retries (milliseconds)

from xbbg import blp

# Retry up to 3 times with exponential backoff: 1s → 2s → 4s (capped at 30s)
blp.configure(
    retry_max_retries=3,
    retry_initial_delay_ms=1000,
    retry_backoff_factor=2.0,
    retry_max_delay_ms=30000,
)

INFO

Delay sequence: initial_delay_ms * backoff_factor^n, capped at retry_max_delay_ms. With the defaults above: 1000 ms, 2000 ms, 4000 ms.

---

SDK Logging

Bloomberg SDK log output is suppressed by default. Two ways to enable it:

At configure time — set sdk_log_level in EngineConfig:

from xbbg import blp

blp.configure(sdk_log_level='INFO')

At runtime — call enable_sdk_logging() after configuration:

import xbbg

xbbg.enable_sdk_logging('DEBUG')

Accepted levels are Bloomberg SDK level strings: 'OFF', 'FATAL', 'ERROR', 'WARN', 'INFO', 'DEBUG', 'TRACE'.