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Libre threads (#5303)

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# Description of Changes

<!--
Please provide a summary of the changes, including:

- What was changed
- Why the change was made
- Any challenges encountered

Closes #(issue_number)
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---

## Checklist

### General

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### Translations (if applicable)

- [ ] I ran
[`scripts/counter_translation.py`](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/docs/counter_translation.md)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md#6-testing)
for more details.
This commit is contained in:
Anthony Stirling
2026-01-15 19:14:45 +00:00
committed by GitHub
parent 8afbd0afed
commit 3e061516a5
16 changed files with 1449 additions and 47 deletions
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docker/embedded/compose/README-remote-uno.md
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# Stirling-PDF with Remote UNO Servers
This docker-compose configuration demonstrates running Stirling-PDF with **separate UNO server containers** for LibreOffice document conversion, enabling horizontal scaling and better resource isolation.
## Architecture
```
┌─────────────────────┐
│ Stirling-PDF │
│ (Main App) │
│ │
│ Uses BlockingQueue │
│ pool to distribute │
│ load across servers │
└──────┬──────┬───────┘
│ │
│ │ Remote endpoints
│ │ (hostLocation: remote)
│ │
┌───▼──┐ ┌─▼────┐
│ UNO │ │ UNO │
│ #1 │ │ #2 │
│:2002 │ │:2002 │
└──────┘ └──────┘
```
## Key Features Demonstrated
### 1. Remote UNO Server Configuration
- **hostLocation: "remote"** - Required for cross-container communication
- **BlockingQueue pool** - Optimal endpoint selection under load
- **Health checks** - Each UNO server has `unoping` health check
### 2. Environment Variable Configuration
```yaml
PROCESS_EXECUTOR_AUTO_UNO_SERVER: "false" # Disable local servers
# Define remote endpoints (Spring Boot list syntax)
PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_0_HOST: "unoserver1"
PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_0_PORT: "2002"
PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_0_HOST_LOCATION: "remote" # Critical!
PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_0_PROTOCOL: "http"
PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_1_HOST: "unoserver2"
PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_1_PORT: "2002"
PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_1_HOST_LOCATION: "remote"
PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_1_PROTOCOL: "http"
```
### 3. Session Limit
```yaml
PROCESS_EXECUTOR_SESSION_LIMIT_LIBRE_OFFICE_SESSION_LIMIT: "2"
```
Should match endpoint count for optimal concurrency.
## Usage
### Start the Stack
```bash
docker compose -f docker-compose-latest-security-remote-uno.yml up -d
```
### Monitor Logs
```bash
# Watch all services
docker compose -f docker-compose-latest-security-remote-uno.yml logs -f
# Watch just UNO servers
docker compose -f docker-compose-latest-security-remote-uno.yml logs -f unoserver1 unoserver2
# Watch main app
docker compose -f docker-compose-latest-security-remote-uno.yml logs -f stirling-pdf
```
### Health Check Status
```bash
docker compose -f docker-compose-latest-security-remote-uno.yml ps
```
Should show all services healthy:
```
NAME STATUS
Stirling-PDF-Security-Remote-UNO Up (healthy)
UNO-Server-1 Up (healthy)
UNO-Server-2 Up (healthy)
```
### Test Conversion Load Distribution
Upload multiple documents for conversion and watch the logs - you'll see requests distributed across both UNO servers via the BlockingQueue pool.
## Scaling UNO Servers
### Add More Servers
To add a 3rd UNO server:
1. Add service to compose file:
```yaml
unoserver3:
container_name: UNO-Server-3
image: ghcr.io/unoconv/unoserver-docker:0.4.4
# ... same config as unoserver1/2
```
2. Add environment variables to stirling-pdf service:
```yaml
PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_2_HOST: "unoserver3"
PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_2_PORT: "2002"
PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_2_HOST_LOCATION: "remote"
PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_2_PROTOCOL: "http"
PROCESS_EXECUTOR_SESSION_LIMIT_LIBRE_OFFICE_SESSION_LIMIT: "3" # Update!
```
3. Add to `depends_on`:
```yaml
depends_on:
unoserver1:
condition: service_healthy
unoserver2:
condition: service_healthy
unoserver3:
condition: service_healthy
```
### Scale with Docker Compose (Alternative)
```bash
docker compose -f docker-compose-latest-security-remote-uno.yml up -d --scale unoserver1=3
```
Note: This requires removing `container_name` and hardcoded ports.
## Troubleshooting
### "Connection refused" errors
- **Cause**: `hostLocation: "auto"` or missing
- **Fix**: Set `HOSTLOCATION: "remote"` for all endpoints
### Conversions using only one server
- **Cause**: Session limit too low or not matching endpoint count
- **Fix**: Set `PROCESS_EXECUTOR_SESSION_LIMIT_LIBRE_OFFICE_SESSION_LIMIT` to match endpoint count
### UNO server not starting
- **Check**: `docker compose logs unoserver1`
- **Common**: LibreOffice profile corruption
- **Fix**: `docker compose down -v` (removes volumes)
## Comparison: Local vs Remote UNO Servers
### Local (Auto) Mode
```yaml
PROCESS_EXECUTOR_AUTO_UNO_SERVER: "true"
PROCESS_EXECUTOR_SESSION_LIMIT_LIBRE_OFFICE_SESSION_LIMIT: "2"
# Creates 2 servers on 127.0.0.1:2003, 127.0.0.1:2005 inside container (Stirling-PDF's own servers)
```
- ✅ Simpler configuration
- ✅ Lower latency
- ❌ All in one container (resource competition)
- ❌ Can't scale independently
### Remote Mode (This File)
```yaml
PROCESS_EXECUTOR_AUTO_UNO_SERVER: "false"
# Define external endpoints with hostLocation: "remote"
```
- ✅ Resource isolation (separate containers)
- ✅ Independent scaling
- ✅ Better resilience (restart one without affecting others)
- ❌ Slightly higher network overhead
- ❌ More complex configuration
## Advanced Configuration
### HTTPS UNO Servers
If your UNO servers use HTTPS (e.g., behind a reverse proxy):
```yaml
PROCESS_EXECUTOR_UNOSERVERENDPOINTS_0_PROTOCOL: "https"
```
### Custom Health Check Interval
```yaml
unoserver1:
healthcheck:
interval: 5s # Check more frequently
timeout: 3s
retries: 10
start_period: 60s # Give more startup time
```
### Debug Mode
To see detailed endpoint selection logs:
```yaml
environment:
LOGGING_LEVEL_STIRLING_SOFTWARE_COMMON_UTIL_PROCESSEXECUTOR: DEBUG
```
## What This Demonstrates
This configuration showcases all the improvements from the PR reviews:
1. ✅ **Remote endpoint support** (`hostLocation: "remote"`)
2. ✅ **BlockingQueue pool** (optimal endpoint distribution)
3. ✅ **Idempotent lease close** (thread-safe)
4. ✅ **Robust health checks** (unoping → TCP → PID fallbacks)
5. ✅ **Proper validation** (hostLocation/protocol normalized)
6. ✅ **Session limit warnings** (logs mismatch if misconfigured)
## Performance Expectations
With 2 UNO servers, you can expect:
- **2x concurrent conversions** vs single server
- **~50% reduction in queue wait time** under load
- **Better resilience**: One server failure = 50% capacity, not 0%
Tested with 100GB+ PDFs - BlockingQueue ensures no endpoint starvation.
docker/embedded/compose/docker-compose-latest-security-remote-uno.yml
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services:
stirling-pdf:
container_name: Stirling-PDF-Security-Remote-UNO
image: docker.stirlingpdf.com/stirlingtools/stirling-pdf:latest
build:
context: ../../..
dockerfile: docker/embedded/Dockerfile
healthcheck:
test: ["CMD-SHELL", "curl -f http://localhost:8080/api/v1/info/status | grep -q 'UP'"]
interval: 5s
timeout: 10s
retries: 16
ports:
- 8080:8080
volumes:
- ../../../stirling/latest/data:/usr/share/tessdata:rw
- ../../../stirling/latest/config:/configs:rw
- ../../../stirling/latest/logs:/logs:rw
- stirling-tmp:/tmp/stirling-pdf:rw
environment:
DISABLE_ADDITIONAL_FEATURES: "false"
SECURITY_ENABLELOGIN: "false"
# Disable auto UNO server (we're using remote servers instead)
PROCESS_EXECUTOR_AUTO_UNO_SERVER: "false"
# Configure remote UNO server pool
PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_0_HOST: "unoserver1"
PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_0_PORT: "2003"
PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_0_HOST_LOCATION: "remote"
PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_0_PROTOCOL: "http"
PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_1_HOST: "unoserver2"
PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_1_PORT: "2003"
PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_1_HOST_LOCATION: "remote"
PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_1_PROTOCOL: "http"
# Session limit should match endpoint count for optimal concurrency
PROCESS_EXECUTOR_SESSION_LIMIT_LIBRE_OFFICE_SESSION_LIMIT: "2"
PUID: 1002
PGID: 1002
UMASK: "022"
SYSTEM_DEFAULTLOCALE: en-US
UI_APPNAME: Stirling-PDF
UI_HOMEDESCRIPTION: Demo site for Stirling-PDF Latest with Security + Remote UNO Servers
UI_APPNAMENAVBAR: Stirling-PDF Latest
SYSTEM_MAXFILESIZE: "100"
METRICS_ENABLED: "true"
SYSTEM_GOOGLEVISIBILITY: "true"
SHOW_SURVEY: "true"
depends_on:
unoserver1:
condition: service_healthy
unoserver2:
condition: service_healthy
networks:
- stirling-network
restart: on-failure:5
unoserver1:
container_name: UNO-Server-1
# NOTE: This image needs to be updated to unoserver 3.6 to match Stirling-PDF's client version
# Current :latest uses 3.4 which causes API mismatch errors
image: ghcr.io/unoconv/unoserver-docker:latest
volumes:
- stirling-tmp:/tmp/stirling-pdf:rw
expose:
- "2003"
healthcheck:
test: ["CMD-SHELL", "timeout 2 bash -c 'cat < /dev/null > /dev/tcp/localhost/2003' || exit 1"]
interval: 10s
timeout: 5s
retries: 5
start_period: 30s
networks:
- stirling-network
restart: on-failure:5
unoserver2:
container_name: UNO-Server-2
# NOTE: This image needs to be updated to unoserver 3.6 to match Stirling-PDF's client version
# Current :latest uses 3.4 which causes API mismatch errors
image: ghcr.io/unoconv/unoserver-docker:latest
volumes:
- stirling-tmp:/tmp/stirling-pdf:rw
expose:
- "2003"
healthcheck:
test: ["CMD-SHELL", "timeout 2 bash -c 'cat < /dev/null > /dev/tcp/localhost/2003' || exit 1"]
interval: 10s
timeout: 5s
retries: 5
start_period: 30s
networks:
- stirling-network
restart: on-failure:5
networks:
stirling-network:
driver: bridge
volumes:
stirling-tmp:
docker/embedded/compose/docker-compose-latest-security.yml
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@@ -0,0 +1,35 @@
services:
stirling-pdf:
container_name: Stirling-PDF-Security
image: docker.stirlingpdf.com/stirlingtools/stirling-pdf:latest
build:
context: ../../..
dockerfile: docker/embedded/Dockerfile
healthcheck:
test: ["CMD-SHELL", "curl -f http://localhost:8080/api/v1/info/status | grep -q 'UP'"]
interval: 5s
timeout: 10s
retries: 16
ports:
- 8080:8080
volumes:
- ../../../stirling/latest/data:/usr/share/tessdata:rw
- ../../../stirling/latest/config:/configs:rw
- ../../../stirling/latest/logs:/logs:rw
environment:
DISABLE_ADDITIONAL_FEATURES: "false"
SECURITY_ENABLELOGIN: "false"
PROCESS_EXECUTOR_AUTO_UNO_SERVER: "true"
PROCESS_EXECUTOR_SESSION_LIMIT_LIBRE_OFFICE_SESSION_LIMIT: "1"
PUID: 1002
PGID: 1002
UMASK: "022"
SYSTEM_DEFAULTLOCALE: en-US
UI_APPNAME: Stirling-PDF
UI_HOMEDESCRIPTION: Demo site for Stirling-PDF Latest with Security
UI_APPNAMENAVBAR: Stirling-PDF Latest
SYSTEM_MAXFILESIZE: "100"
METRICS_ENABLED: "true"
SYSTEM_GOOGLEVISIBILITY: "true"
SHOW_SURVEY: "true"
restart: on-failure:5
docker/unified/README.md
+5
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@@ -119,6 +119,11 @@ All modes support standard Stirling-PDF environment variables:
- `SYSTEM_MAXFILESIZE` - Max upload size (MB)
- `TESSERACT_LANGS` - Comma-separated OCR language codes
- `JAVA_CUSTOM_OPTS` - Additional JVM options
- `PROCESS_EXECUTOR_AUTO_UNO_SERVER` - Overrides `processExecutor.autoUnoServer` (true or false)
- `PROCESS_EXECUTOR_SESSION_LIMIT_LIBRE_OFFICE_SESSION_LIMIT` - Overrides `processExecutor.sessionLimit.libreOfficeSessionLimit`
- `UNO_SERVER_AUTO` - Legacy alias for `processExecutor.autoUnoServer`
- `UNO_SERVER_COUNT` - Legacy alias for `processExecutor.sessionLimit.libreOfficeSessionLimit`
- `UNO_SERVER_HEALTH_INTERVAL` - Seconds between unoserver PID checks (default: 30)
See full configuration docs at: https://docs.stirlingpdf.com
docker/unified/entrypoint.sh
+205 -10
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@@ -30,14 +30,14 @@ setup_ocr() {
# The cp -rn above won't overwrite user files, just adds missing system files.
# Install additional languages if specified
if [[ -n "$TESSERACT_LANGS" ]]; then
if [ -n "$TESSERACT_LANGS" ]; then
SPACE_SEPARATED_LANGS=$(echo $TESSERACT_LANGS | tr ',' ' ')
pattern='^[a-zA-Z]{2,4}(_[a-zA-Z]{2,4})?$'
for LANG in $SPACE_SEPARATED_LANGS; do
if [[ $LANG =~ $pattern ]]; then
echo "Installing tesseract language: $LANG"
apk add --no-cache "tesseract-ocr-data-$LANG" 2>/dev/null || true
fi
case "$LANG" in
[a-zA-Z][a-zA-Z]|[a-zA-Z][a-zA-Z][a-zA-Z]|[a-zA-Z][a-zA-Z][a-zA-Z][a-zA-Z]|[a-zA-Z][a-zA-Z]_[a-zA-Z][a-zA-Z]|[a-zA-Z][a-zA-Z][a-zA-Z]_[a-zA-Z][a-zA-Z][a-zA-Z]|[a-zA-Z][a-zA-Z][a-zA-Z][a-zA-Z]_[a-zA-Z][a-zA-Z][a-zA-Z][a-zA-Z])
apk add --no-cache "tesseract-ocr-data-$LANG" 2>/dev/null || true
;;
esac
done
fi
@@ -100,6 +100,201 @@ run_as_user() {
fi
}
run_with_timeout() {
local secs=$1; shift
if command -v timeout >/dev/null 2>&1; then
timeout "${secs}s" "$@"
else
"$@"
fi
}
run_as_user_with_timeout() {
local secs=$1; shift
if command -v timeout >/dev/null 2>&1; then
run_as_user timeout "${secs}s" "$@"
else
run_as_user "$@"
fi
}
tcp_port_check() {
local host=$1
local port=$2
local timeout_secs=${3:-5}
# Try nc first (most portable)
if command -v nc >/dev/null 2>&1; then
run_with_timeout "$timeout_secs" nc -z "$host" "$port" 2>/dev/null
return $?
fi
# Fallback to /dev/tcp (bash-specific)
if [ -n "${BASH_VERSION:-}" ] && command -v bash >/dev/null 2>&1; then
run_with_timeout "$timeout_secs" bash -c "exec 3<>/dev/tcp/${host}/${port}" 2>/dev/null
local result=$?
exec 3>&- 2>/dev/null || true
return $result
fi
# No TCP check method available
return 2
}
CONFIG_FILE=${CONFIG_FILE:-/configs/settings.yml}
UNOSERVER_PIDS=()
UNOSERVER_PORTS=()
UNOSERVER_UNO_PORTS=()
read_setting_value() {
local key=$1
if [ ! -f "$CONFIG_FILE" ]; then
return
fi
awk -F: -v key="$key" '
$1 ~ "^[[:space:]]*"key"[[:space:]]*$" {
val=$2
sub(/#.*/, "", val)
gsub(/^[[:space:]]+|[[:space:]]+$/, "", val)
gsub(/^["'"'"']|["'"'"']$/, "", val)
print val
exit
}
' "$CONFIG_FILE"
}
get_unoserver_auto() {
if [ -n "${PROCESS_EXECUTOR_AUTO_UNO_SERVER:-}" ]; then
echo "$PROCESS_EXECUTOR_AUTO_UNO_SERVER"
return
fi
if [ -n "${UNO_SERVER_AUTO:-}" ]; then
echo "$UNO_SERVER_AUTO"
return
fi
read_setting_value "autoUnoServer"
}
get_unoserver_count() {
if [ -n "${PROCESS_EXECUTOR_SESSION_LIMIT_LIBRE_OFFICE_SESSION_LIMIT:-}" ]; then
echo "$PROCESS_EXECUTOR_SESSION_LIMIT_LIBRE_OFFICE_SESSION_LIMIT"
return
fi
if [ -n "${UNO_SERVER_COUNT:-}" ]; then
echo "$UNO_SERVER_COUNT"
return
fi
read_setting_value "libreOfficeSessionLimit"
}
start_unoserver_instance() {
local port=$1
local uno_port=$2
run_as_user /opt/venv/bin/unoserver --port "$port" --interface 127.0.0.1 --uno-port "$uno_port" &
LAST_UNOSERVER_PID=$!
}
start_unoserver_watchdog() {
local interval=${UNO_SERVER_HEALTH_INTERVAL:-30}
case "$interval" in
''|*[!0-9]*) interval=30 ;;
esac
(
while true; do
local i=0
while [ "$i" -lt "${#UNOSERVER_PIDS[@]}" ]; do
local pid=${UNOSERVER_PIDS[$i]}
local port=${UNOSERVER_PORTS[$i]}
local uno_port=${UNOSERVER_UNO_PORTS[$i]}
local needs_restart=false
# Check 1: PID exists
if [ -z "$pid" ] || ! kill -0 "$pid" 2>/dev/null; then
echo "unoserver PID ${pid} not found for port ${port}"
needs_restart=true
else
# PID exists, now check if server is actually healthy
local health_ok=false
# Check 2A: Health check with unoping (best - checks actual server health)
if command -v unoping >/dev/null 2>&1; then
if run_as_user_with_timeout 5 unoping --host 127.0.0.1 --port "$port" >/dev/null 2>&1; then
health_ok=true
else
echo "unoserver health check failed (unoping) for port ${port}, trying TCP fallback"
fi
fi
# Check 2B: Fallback to TCP port check (verifies service is listening)
if [ "$health_ok" = false ]; then
tcp_port_check "127.0.0.1" "$port" 5
local tcp_rc=$?
if [ $tcp_rc -eq 0 ]; then
health_ok=true
elif [ $tcp_rc -eq 2 ]; then
echo "No TCP check available; falling back to PID-only for port ${port}"
health_ok=true
else
echo "unoserver TCP check failed for port ${port}"
needs_restart=true
fi
fi
fi
if [ "$needs_restart" = true ]; then
echo "Restarting unoserver on 127.0.0.1:${port} (uno-port ${uno_port})"
# Kill the old process if it exists
if [ -n "$pid" ] && kill -0 "$pid" 2>/dev/null; then
kill -TERM "$pid" 2>/dev/null || true
sleep 1
kill -KILL "$pid" 2>/dev/null || true
fi
start_unoserver_instance "$port" "$uno_port"
UNOSERVER_PIDS[$i]=$LAST_UNOSERVER_PID
fi
i=$((i + 1))
done
sleep "$interval"
done
) &
}
start_unoserver_pool() {
local auto
auto="$(get_unoserver_auto)"
auto="${auto,,}"
if [ -z "$auto" ]; then
auto="true"
fi
if [ "$auto" != "true" ]; then
echo "Skipping local unoserver pool (autoUnoServer=$auto)"
return
fi
local count
count="$(get_unoserver_count)"
case "$count" in
''|*[!0-9]*) count=1 ;;
esac
if [ "$count" -le 0 ]; then
count=1
fi
local i=0
while [ "$i" -lt "$count" ]; do
local port=$((2003 + (i * 2)))
local uno_port=$((2004 + (i * 2)))
echo "Starting unoserver on 127.0.0.1:${port} (uno-port ${uno_port})"
UNOSERVER_PORTS+=("$port")
UNOSERVER_UNO_PORTS+=("$uno_port")
start_unoserver_instance "$port" "$uno_port"
UNOSERVER_PIDS+=("$LAST_UNOSERVER_PID")
i=$((i + 1))
done
start_unoserver_watchdog
}
# Setup OCR and permissions
setup_ocr
setup_permissions
@@ -120,9 +315,8 @@ case "$MODE" in
-jar /app.jar" &
BACKEND_PID=$!
# Start unoserver for document conversion
run_as_user /opt/venv/bin/unoserver --port 2003 --interface 127.0.0.1 &
UNO_PID=$!
# Start unoserver pool for document conversion
start_unoserver_pool
# Wait for backend to start
sleep 3
@@ -165,8 +359,9 @@ case "$MODE" in
run_as_user sh -c "java -Dfile.encoding=UTF-8 \
-Djava.io.tmpdir=/tmp/stirling-pdf \
-Dserver.port=8080 \
-jar /app.jar & /opt/venv/bin/unoserver --port 2003 --interface 127.0.0.1" &
-jar /app.jar" &
BACKEND_PID=$!
start_unoserver_pool
echo "==================================="
echo "✓ Backend API available at: http://localhost:8080/api"