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<h1 id="error-handling">Error Handling<a class="headerlink" href="#error-handling" title="Permanent link">&para;</a></h1>
<p>Headroom provides explicit exceptions for debugging, with a safety guarantee that compression failures never break your LLM calls.</p>
<h2 id="exception-hierarchy">Exception Hierarchy<a class="headerlink" href="#exception-hierarchy" title="Permanent link">&para;</a></h2>
<div class="language-python highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">headroom</span><span class="w"> </span><span class="kn">import</span> <span class="p">(</span>
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a> <span class="n">HeadroomError</span><span class="p">,</span> <span class="c1"># Base class - catch all Headroom errors</span>
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a> <span class="n">ConfigurationError</span><span class="p">,</span> <span class="c1"># Invalid configuration</span>
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a> <span class="n">ProviderError</span><span class="p">,</span> <span class="c1"># Provider issues (unknown model, etc.)</span>
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a> <span class="n">StorageError</span><span class="p">,</span> <span class="c1"># Database/storage failures</span>
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a> <span class="n">CompressionError</span><span class="p">,</span> <span class="c1"># Compression failures (rare)</span>
</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a> <span class="n">ValidationError</span><span class="p">,</span> <span class="c1"># Setup validation failures</span>
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a><span class="p">)</span>
</span></code></pre></div>
<h2 id="usage">Usage<a class="headerlink" href="#usage" title="Permanent link">&para;</a></h2>
<div class="language-python highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">headroom</span><span class="w"> </span><span class="kn">import</span> <span class="p">(</span>
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a> <span class="n">HeadroomClient</span><span class="p">,</span>
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a> <span class="n">HeadroomError</span><span class="p">,</span>
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a> <span class="n">ConfigurationError</span><span class="p">,</span>
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a> <span class="n">StorageError</span><span class="p">,</span>
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="p">)</span>
</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a>
</span><span id="__span-1-8"><a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a><span class="k">try</span><span class="p">:</span>
</span><span id="__span-1-9"><a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a> <span class="n">client</span> <span class="o">=</span> <span class="n">HeadroomClient</span><span class="p">(</span><span class="o">...</span><span class="p">)</span>
</span><span id="__span-1-10"><a id="__codelineno-1-10" name="__codelineno-1-10" href="#__codelineno-1-10"></a> <span class="n">response</span> <span class="o">=</span> <span class="n">client</span><span class="o">.</span><span class="n">chat</span><span class="o">.</span><span class="n">completions</span><span class="o">.</span><span class="n">create</span><span class="p">(</span><span class="o">...</span><span class="p">)</span>
</span><span id="__span-1-11"><a id="__codelineno-1-11" name="__codelineno-1-11" href="#__codelineno-1-11"></a>
</span><span id="__span-1-12"><a id="__codelineno-1-12" name="__codelineno-1-12" href="#__codelineno-1-12"></a><span class="k">except</span> <span class="n">ConfigurationError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
</span><span id="__span-1-13"><a id="__codelineno-1-13" name="__codelineno-1-13" href="#__codelineno-1-13"></a> <span class="nb">print</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;Config issue: </span><span class="si">{</span><span class="n">e</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">)</span>
</span><span id="__span-1-14"><a id="__codelineno-1-14" name="__codelineno-1-14" href="#__codelineno-1-14"></a> <span class="nb">print</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;Details: </span><span class="si">{</span><span class="n">e</span><span class="o">.</span><span class="n">details</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">)</span> <span class="c1"># Additional context</span>
</span><span id="__span-1-15"><a id="__codelineno-1-15" name="__codelineno-1-15" href="#__codelineno-1-15"></a>
</span><span id="__span-1-16"><a id="__codelineno-1-16" name="__codelineno-1-16" href="#__codelineno-1-16"></a><span class="k">except</span> <span class="n">StorageError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
</span><span id="__span-1-17"><a id="__codelineno-1-17" name="__codelineno-1-17" href="#__codelineno-1-17"></a> <span class="nb">print</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;Storage issue: </span><span class="si">{</span><span class="n">e</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">)</span>
</span><span id="__span-1-18"><a id="__codelineno-1-18" name="__codelineno-1-18" href="#__codelineno-1-18"></a> <span class="c1"># Headroom continues to work, just without metrics persistence</span>
</span><span id="__span-1-19"><a id="__codelineno-1-19" name="__codelineno-1-19" href="#__codelineno-1-19"></a>
</span><span id="__span-1-20"><a id="__codelineno-1-20" name="__codelineno-1-20" href="#__codelineno-1-20"></a><span class="k">except</span> <span class="n">HeadroomError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
</span><span id="__span-1-21"><a id="__codelineno-1-21" name="__codelineno-1-21" href="#__codelineno-1-21"></a> <span class="nb">print</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;Headroom error: </span><span class="si">{</span><span class="n">e</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">)</span>
</span></code></pre></div>
<h2 id="exception-types">Exception Types<a class="headerlink" href="#exception-types" title="Permanent link">&para;</a></h2>
<h3 id="configurationerror">ConfigurationError<a class="headerlink" href="#configurationerror" title="Permanent link">&para;</a></h3>
<p>Raised when configuration is invalid.</p>
<div class="language-python highlight"><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="c1"># Examples:</span>
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a><span class="c1"># - Invalid mode value</span>
</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a><span class="c1"># - Missing required provider</span>
</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a><span class="c1"># - Invalid model context limit</span>
</span><span id="__span-2-5"><a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a>
</span><span id="__span-2-6"><a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a><span class="k">try</span><span class="p">:</span>
</span><span id="__span-2-7"><a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a> <span class="n">client</span> <span class="o">=</span> <span class="n">HeadroomClient</span><span class="p">(</span>
</span><span id="__span-2-8"><a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a> <span class="n">original_client</span><span class="o">=</span><span class="n">OpenAI</span><span class="p">(),</span>
</span><span id="__span-2-9"><a id="__codelineno-2-9" name="__codelineno-2-9" href="#__codelineno-2-9"></a> <span class="n">provider</span><span class="o">=</span><span class="n">OpenAIProvider</span><span class="p">(),</span>
</span><span id="__span-2-10"><a id="__codelineno-2-10" name="__codelineno-2-10" href="#__codelineno-2-10"></a> <span class="n">default_mode</span><span class="o">=</span><span class="s2">&quot;invalid_mode&quot;</span><span class="p">,</span> <span class="c1"># Will raise ConfigurationError</span>
</span><span id="__span-2-11"><a id="__codelineno-2-11" name="__codelineno-2-11" href="#__codelineno-2-11"></a> <span class="p">)</span>
</span><span id="__span-2-12"><a id="__codelineno-2-12" name="__codelineno-2-12" href="#__codelineno-2-12"></a><span class="k">except</span> <span class="n">ConfigurationError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
</span><span id="__span-2-13"><a id="__codelineno-2-13" name="__codelineno-2-13" href="#__codelineno-2-13"></a> <span class="nb">print</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;Config error: </span><span class="si">{</span><span class="n">e</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">)</span>
</span><span id="__span-2-14"><a id="__codelineno-2-14" name="__codelineno-2-14" href="#__codelineno-2-14"></a> <span class="nb">print</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;Field: </span><span class="si">{</span><span class="n">e</span><span class="o">.</span><span class="n">details</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;field&#39;</span><span class="p">)</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">)</span>
</span></code></pre></div>
<h3 id="providererror">ProviderError<a class="headerlink" href="#providererror" title="Permanent link">&para;</a></h3>
<p>Raised for provider-specific issues.</p>
<div class="language-python highlight"><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="c1"># Examples:</span>
</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a><span class="c1"># - Unknown model name</span>
</span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a><span class="c1"># - Provider API error</span>
</span><span id="__span-3-4"><a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a><span class="c1"># - Token counting failure</span>
</span><span id="__span-3-5"><a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a>
</span><span id="__span-3-6"><a id="__codelineno-3-6" name="__codelineno-3-6" href="#__codelineno-3-6"></a><span class="k">try</span><span class="p">:</span>
</span><span id="__span-3-7"><a id="__codelineno-3-7" name="__codelineno-3-7" href="#__codelineno-3-7"></a> <span class="n">response</span> <span class="o">=</span> <span class="n">client</span><span class="o">.</span><span class="n">chat</span><span class="o">.</span><span class="n">completions</span><span class="o">.</span><span class="n">create</span><span class="p">(</span>
</span><span id="__span-3-8"><a id="__codelineno-3-8" name="__codelineno-3-8" href="#__codelineno-3-8"></a> <span class="n">model</span><span class="o">=</span><span class="s2">&quot;unknown-model-xyz&quot;</span><span class="p">,</span>
</span><span id="__span-3-9"><a id="__codelineno-3-9" name="__codelineno-3-9" href="#__codelineno-3-9"></a> <span class="n">messages</span><span class="o">=</span><span class="p">[</span><span class="o">...</span><span class="p">]</span>
</span><span id="__span-3-10"><a id="__codelineno-3-10" name="__codelineno-3-10" href="#__codelineno-3-10"></a> <span class="p">)</span>
</span><span id="__span-3-11"><a id="__codelineno-3-11" name="__codelineno-3-11" href="#__codelineno-3-11"></a><span class="k">except</span> <span class="n">ProviderError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
</span><span id="__span-3-12"><a id="__codelineno-3-12" name="__codelineno-3-12" href="#__codelineno-3-12"></a> <span class="nb">print</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;Provider error: </span><span class="si">{</span><span class="n">e</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">)</span>
</span><span id="__span-3-13"><a id="__codelineno-3-13" name="__codelineno-3-13" href="#__codelineno-3-13"></a> <span class="nb">print</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;Provider: </span><span class="si">{</span><span class="n">e</span><span class="o">.</span><span class="n">details</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;provider&#39;</span><span class="p">)</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">)</span>
</span></code></pre></div>
<h3 id="storageerror">StorageError<a class="headerlink" href="#storageerror" title="Permanent link">&para;</a></h3>
<p>Raised when database operations fail.</p>
<div class="language-python highlight"><pre><span></span><code><span id="__span-4-1"><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a><span class="c1"># Examples:</span>
</span><span id="__span-4-2"><a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a><span class="c1"># - Database connection failure</span>
</span><span id="__span-4-3"><a id="__codelineno-4-3" name="__codelineno-4-3" href="#__codelineno-4-3"></a><span class="c1"># - Write permission denied</span>
</span><span id="__span-4-4"><a id="__codelineno-4-4" name="__codelineno-4-4" href="#__codelineno-4-4"></a><span class="c1"># - Disk full</span>
</span><span id="__span-4-5"><a id="__codelineno-4-5" name="__codelineno-4-5" href="#__codelineno-4-5"></a>
</span><span id="__span-4-6"><a id="__codelineno-4-6" name="__codelineno-4-6" href="#__codelineno-4-6"></a><span class="k">try</span><span class="p">:</span>
</span><span id="__span-4-7"><a id="__codelineno-4-7" name="__codelineno-4-7" href="#__codelineno-4-7"></a> <span class="n">metrics</span> <span class="o">=</span> <span class="n">client</span><span class="o">.</span><span class="n">get_metrics</span><span class="p">()</span>
</span><span id="__span-4-8"><a id="__codelineno-4-8" name="__codelineno-4-8" href="#__codelineno-4-8"></a><span class="k">except</span> <span class="n">StorageError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
</span><span id="__span-4-9"><a id="__codelineno-4-9" name="__codelineno-4-9" href="#__codelineno-4-9"></a> <span class="nb">print</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;Storage error: </span><span class="si">{</span><span class="n">e</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">)</span>
</span><span id="__span-4-10"><a id="__codelineno-4-10" name="__codelineno-4-10" href="#__codelineno-4-10"></a> <span class="c1"># Application can continue - just won&#39;t have metrics</span>
</span></code></pre></div>
<h3 id="compressionerror">CompressionError<a class="headerlink" href="#compressionerror" title="Permanent link">&para;</a></h3>
<p>Raised when compression fails (rare).</p>
<div class="language-python highlight"><pre><span></span><code><span id="__span-5-1"><a id="__codelineno-5-1" name="__codelineno-5-1" href="#__codelineno-5-1"></a><span class="c1"># Examples:</span>
</span><span id="__span-5-2"><a id="__codelineno-5-2" name="__codelineno-5-2" href="#__codelineno-5-2"></a><span class="c1"># - Malformed JSON in tool output</span>
</span><span id="__span-5-3"><a id="__codelineno-5-3" name="__codelineno-5-3" href="#__codelineno-5-3"></a><span class="c1"># - Unexpected data structure</span>
</span><span id="__span-5-4"><a id="__codelineno-5-4" name="__codelineno-5-4" href="#__codelineno-5-4"></a>
</span><span id="__span-5-5"><a id="__codelineno-5-5" name="__codelineno-5-5" href="#__codelineno-5-5"></a><span class="c1"># Note: In practice, compression errors are caught internally</span>
</span><span id="__span-5-6"><a id="__codelineno-5-6" name="__codelineno-5-6" href="#__codelineno-5-6"></a><span class="c1"># and the original content passes through unchanged.</span>
</span><span id="__span-5-7"><a id="__codelineno-5-7" name="__codelineno-5-7" href="#__codelineno-5-7"></a><span class="c1"># This exception is only raised if you explicitly enable strict mode.</span>
</span></code></pre></div>
<h3 id="validationerror">ValidationError<a class="headerlink" href="#validationerror" title="Permanent link">&para;</a></h3>
<p>Raised when setup validation fails.</p>
<div class="language-python highlight"><pre><span></span><code><span id="__span-6-1"><a id="__codelineno-6-1" name="__codelineno-6-1" href="#__codelineno-6-1"></a><span class="n">result</span> <span class="o">=</span> <span class="n">client</span><span class="o">.</span><span class="n">validate_setup</span><span class="p">()</span>
</span><span id="__span-6-2"><a id="__codelineno-6-2" name="__codelineno-6-2" href="#__codelineno-6-2"></a><span class="k">if</span> <span class="ow">not</span> <span class="n">result</span><span class="p">[</span><span class="s2">&quot;valid&quot;</span><span class="p">]:</span>
</span><span id="__span-6-3"><a id="__codelineno-6-3" name="__codelineno-6-3" href="#__codelineno-6-3"></a> <span class="k">raise</span> <span class="n">ValidationError</span><span class="p">(</span>
</span><span id="__span-6-4"><a id="__codelineno-6-4" name="__codelineno-6-4" href="#__codelineno-6-4"></a> <span class="s2">&quot;Setup validation failed&quot;</span><span class="p">,</span>
</span><span id="__span-6-5"><a id="__codelineno-6-5" name="__codelineno-6-5" href="#__codelineno-6-5"></a> <span class="n">details</span><span class="o">=</span><span class="p">{</span><span class="s2">&quot;issues&quot;</span><span class="p">:</span> <span class="n">result</span><span class="p">[</span><span class="s2">&quot;issues&quot;</span><span class="p">]}</span>
</span><span id="__span-6-6"><a id="__codelineno-6-6" name="__codelineno-6-6" href="#__codelineno-6-6"></a> <span class="p">)</span>
</span></code></pre></div>
<h2 id="safety-guarantee">Safety Guarantee<a class="headerlink" href="#safety-guarantee" title="Permanent link">&para;</a></h2>
<p><strong>If compression fails, the original content passes through unchanged.</strong></p>
<p>This is a core design principle. Your LLM calls never fail due to Headroom:</p>
<div class="language-python highlight"><pre><span></span><code><span id="__span-7-1"><a id="__codelineno-7-1" name="__codelineno-7-1" href="#__codelineno-7-1"></a><span class="c1"># Even if SmartCrusher encounters unexpected data:</span>
</span><span id="__span-7-2"><a id="__codelineno-7-2" name="__codelineno-7-2" href="#__codelineno-7-2"></a><span class="n">messages</span> <span class="o">=</span> <span class="p">[</span>
</span><span id="__span-7-3"><a id="__codelineno-7-3" name="__codelineno-7-3" href="#__codelineno-7-3"></a> <span class="p">{</span><span class="s2">&quot;role&quot;</span><span class="p">:</span> <span class="s2">&quot;tool&quot;</span><span class="p">,</span> <span class="s2">&quot;content&quot;</span><span class="p">:</span> <span class="s2">&quot;malformed json {{{&quot;</span><span class="p">}</span>
</span><span id="__span-7-4"><a id="__codelineno-7-4" name="__codelineno-7-4" href="#__codelineno-7-4"></a><span class="p">]</span>
</span><span id="__span-7-5"><a id="__codelineno-7-5" name="__codelineno-7-5" href="#__codelineno-7-5"></a>
</span><span id="__span-7-6"><a id="__codelineno-7-6" name="__codelineno-7-6" href="#__codelineno-7-6"></a><span class="c1"># This will NOT raise an exception</span>
</span><span id="__span-7-7"><a id="__codelineno-7-7" name="__codelineno-7-7" href="#__codelineno-7-7"></a><span class="c1"># Instead, the malformed content passes through unchanged</span>
</span><span id="__span-7-8"><a id="__codelineno-7-8" name="__codelineno-7-8" href="#__codelineno-7-8"></a><span class="n">response</span> <span class="o">=</span> <span class="n">client</span><span class="o">.</span><span class="n">chat</span><span class="o">.</span><span class="n">completions</span><span class="o">.</span><span class="n">create</span><span class="p">(</span>
</span><span id="__span-7-9"><a id="__codelineno-7-9" name="__codelineno-7-9" href="#__codelineno-7-9"></a> <span class="n">model</span><span class="o">=</span><span class="s2">&quot;gpt-4o&quot;</span><span class="p">,</span>
</span><span id="__span-7-10"><a id="__codelineno-7-10" name="__codelineno-7-10" href="#__codelineno-7-10"></a> <span class="n">messages</span><span class="o">=</span><span class="n">messages</span>
</span><span id="__span-7-11"><a id="__codelineno-7-11" name="__codelineno-7-11" href="#__codelineno-7-11"></a><span class="p">)</span>
</span></code></pre></div>
<h2 id="logging-errors">Logging Errors<a class="headerlink" href="#logging-errors" title="Permanent link">&para;</a></h2>
<p>Enable logging to see error details:</p>
<div class="language-python highlight"><pre><span></span><code><span id="__span-8-1"><a id="__codelineno-8-1" name="__codelineno-8-1" href="#__codelineno-8-1"></a><span class="kn">import</span><span class="w"> </span><span class="nn">logging</span>
</span><span id="__span-8-2"><a id="__codelineno-8-2" name="__codelineno-8-2" href="#__codelineno-8-2"></a><span class="n">logging</span><span class="o">.</span><span class="n">basicConfig</span><span class="p">(</span><span class="n">level</span><span class="o">=</span><span class="n">logging</span><span class="o">.</span><span class="n">WARNING</span><span class="p">)</span>
</span><span id="__span-8-3"><a id="__codelineno-8-3" name="__codelineno-8-3" href="#__codelineno-8-3"></a>
</span><span id="__span-8-4"><a id="__codelineno-8-4" name="__codelineno-8-4" href="#__codelineno-8-4"></a><span class="c1"># Now you&#39;ll see warnings when compression is skipped:</span>
</span><span id="__span-8-5"><a id="__codelineno-8-5" name="__codelineno-8-5" href="#__codelineno-8-5"></a><span class="c1"># WARNING:headroom.transforms.smart_crusher:Skipping compression: invalid JSON</span>
</span></code></pre></div>
<h2 id="error-details">Error Details<a class="headerlink" href="#error-details" title="Permanent link">&para;</a></h2>
<p>All Headroom exceptions include a <code>details</code> dict with context:</p>
<div class="language-python highlight"><pre><span></span><code><span id="__span-9-1"><a id="__codelineno-9-1" name="__codelineno-9-1" href="#__codelineno-9-1"></a><span class="k">try</span><span class="p">:</span>
</span><span id="__span-9-2"><a id="__codelineno-9-2" name="__codelineno-9-2" href="#__codelineno-9-2"></a> <span class="n">client</span> <span class="o">=</span> <span class="n">HeadroomClient</span><span class="p">(</span><span class="o">...</span><span class="p">)</span>
</span><span id="__span-9-3"><a id="__codelineno-9-3" name="__codelineno-9-3" href="#__codelineno-9-3"></a><span class="k">except</span> <span class="n">HeadroomError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
</span><span id="__span-9-4"><a id="__codelineno-9-4" name="__codelineno-9-4" href="#__codelineno-9-4"></a> <span class="nb">print</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;Error: </span><span class="si">{</span><span class="n">e</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">)</span>
</span><span id="__span-9-5"><a id="__codelineno-9-5" name="__codelineno-9-5" href="#__codelineno-9-5"></a> <span class="nb">print</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;Type: </span><span class="si">{</span><span class="nb">type</span><span class="p">(</span><span class="n">e</span><span class="p">)</span><span class="o">.</span><span class="vm">__name__</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">)</span>
</span><span id="__span-9-6"><a id="__codelineno-9-6" name="__codelineno-9-6" href="#__codelineno-9-6"></a> <span class="nb">print</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;Details: </span><span class="si">{</span><span class="n">e</span><span class="o">.</span><span class="n">details</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">)</span>
</span><span id="__span-9-7"><a id="__codelineno-9-7" name="__codelineno-9-7" href="#__codelineno-9-7"></a>
</span><span id="__span-9-8"><a id="__codelineno-9-8" name="__codelineno-9-8" href="#__codelineno-9-8"></a> <span class="c1"># Details might include:</span>
</span><span id="__span-9-9"><a id="__codelineno-9-9" name="__codelineno-9-9" href="#__codelineno-9-9"></a> <span class="c1"># - field: which config field caused the error</span>
</span><span id="__span-9-10"><a id="__codelineno-9-10" name="__codelineno-9-10" href="#__codelineno-9-10"></a> <span class="c1"># - provider: which provider was involved</span>
</span><span id="__span-9-11"><a id="__codelineno-9-11" name="__codelineno-9-11" href="#__codelineno-9-11"></a> <span class="c1"># - model: which model was requested</span>
</span><span id="__span-9-12"><a id="__codelineno-9-12" name="__codelineno-9-12" href="#__codelineno-9-12"></a> <span class="c1"># - original_error: underlying exception</span>
</span></code></pre></div>
<h2 id="best-practices">Best Practices<a class="headerlink" href="#best-practices" title="Permanent link">&para;</a></h2>
<h3 id="1-catch-specific-exceptions">1. Catch Specific Exceptions<a class="headerlink" href="#1-catch-specific-exceptions" title="Permanent link">&para;</a></h3>
<div class="language-python highlight"><pre><span></span><code><span id="__span-10-1"><a id="__codelineno-10-1" name="__codelineno-10-1" href="#__codelineno-10-1"></a><span class="c1"># Good: catch specific exceptions</span>
</span><span id="__span-10-2"><a id="__codelineno-10-2" name="__codelineno-10-2" href="#__codelineno-10-2"></a><span class="k">try</span><span class="p">:</span>
</span><span id="__span-10-3"><a id="__codelineno-10-3" name="__codelineno-10-3" href="#__codelineno-10-3"></a> <span class="n">response</span> <span class="o">=</span> <span class="n">client</span><span class="o">.</span><span class="n">chat</span><span class="o">.</span><span class="n">completions</span><span class="o">.</span><span class="n">create</span><span class="p">(</span><span class="o">...</span><span class="p">)</span>
</span><span id="__span-10-4"><a id="__codelineno-10-4" name="__codelineno-10-4" href="#__codelineno-10-4"></a><span class="k">except</span> <span class="n">ConfigurationError</span><span class="p">:</span>
</span><span id="__span-10-5"><a id="__codelineno-10-5" name="__codelineno-10-5" href="#__codelineno-10-5"></a> <span class="c1"># Handle config issues</span>
</span><span id="__span-10-6"><a id="__codelineno-10-6" name="__codelineno-10-6" href="#__codelineno-10-6"></a> <span class="k">pass</span>
</span><span id="__span-10-7"><a id="__codelineno-10-7" name="__codelineno-10-7" href="#__codelineno-10-7"></a><span class="k">except</span> <span class="n">ProviderError</span><span class="p">:</span>
</span><span id="__span-10-8"><a id="__codelineno-10-8" name="__codelineno-10-8" href="#__codelineno-10-8"></a> <span class="c1"># Handle provider issues</span>
</span><span id="__span-10-9"><a id="__codelineno-10-9" name="__codelineno-10-9" href="#__codelineno-10-9"></a> <span class="k">pass</span>
</span><span id="__span-10-10"><a id="__codelineno-10-10" name="__codelineno-10-10" href="#__codelineno-10-10"></a>
</span><span id="__span-10-11"><a id="__codelineno-10-11" name="__codelineno-10-11" href="#__codelineno-10-11"></a><span class="c1"># Avoid: catching all exceptions</span>
</span><span id="__span-10-12"><a id="__codelineno-10-12" name="__codelineno-10-12" href="#__codelineno-10-12"></a><span class="k">try</span><span class="p">:</span>
</span><span id="__span-10-13"><a id="__codelineno-10-13" name="__codelineno-10-13" href="#__codelineno-10-13"></a> <span class="n">response</span> <span class="o">=</span> <span class="n">client</span><span class="o">.</span><span class="n">chat</span><span class="o">.</span><span class="n">completions</span><span class="o">.</span><span class="n">create</span><span class="p">(</span><span class="o">...</span><span class="p">)</span>
</span><span id="__span-10-14"><a id="__codelineno-10-14" name="__codelineno-10-14" href="#__codelineno-10-14"></a><span class="k">except</span> <span class="ne">Exception</span><span class="p">:</span>
</span><span id="__span-10-15"><a id="__codelineno-10-15" name="__codelineno-10-15" href="#__codelineno-10-15"></a> <span class="c1"># Too broad - might hide real bugs</span>
</span><span id="__span-10-16"><a id="__codelineno-10-16" name="__codelineno-10-16" href="#__codelineno-10-16"></a> <span class="k">pass</span>
</span></code></pre></div>
<h3 id="2-let-storageerror-pass">2. Let StorageError Pass<a class="headerlink" href="#2-let-storageerror-pass" title="Permanent link">&para;</a></h3>
<div class="language-python highlight"><pre><span></span><code><span id="__span-11-1"><a id="__codelineno-11-1" name="__codelineno-11-1" href="#__codelineno-11-1"></a><span class="c1"># Storage errors don&#39;t affect core functionality</span>
</span><span id="__span-11-2"><a id="__codelineno-11-2" name="__codelineno-11-2" href="#__codelineno-11-2"></a><span class="k">try</span><span class="p">:</span>
</span><span id="__span-11-3"><a id="__codelineno-11-3" name="__codelineno-11-3" href="#__codelineno-11-3"></a> <span class="n">metrics</span> <span class="o">=</span> <span class="n">client</span><span class="o">.</span><span class="n">get_metrics</span><span class="p">()</span>
</span><span id="__span-11-4"><a id="__codelineno-11-4" name="__codelineno-11-4" href="#__codelineno-11-4"></a><span class="k">except</span> <span class="n">StorageError</span><span class="p">:</span>
</span><span id="__span-11-5"><a id="__codelineno-11-5" name="__codelineno-11-5" href="#__codelineno-11-5"></a> <span class="n">metrics</span> <span class="o">=</span> <span class="p">[]</span> <span class="c1"># Continue without historical metrics</span>
</span></code></pre></div>
<h3 id="3-validate-on-startup">3. Validate on Startup<a class="headerlink" href="#3-validate-on-startup" title="Permanent link">&para;</a></h3>
<div class="language-python highlight"><pre><span></span><code><span id="__span-12-1"><a id="__codelineno-12-1" name="__codelineno-12-1" href="#__codelineno-12-1"></a><span class="n">client</span> <span class="o">=</span> <span class="n">HeadroomClient</span><span class="p">(</span><span class="o">...</span><span class="p">)</span>
</span><span id="__span-12-2"><a id="__codelineno-12-2" name="__codelineno-12-2" href="#__codelineno-12-2"></a>
</span><span id="__span-12-3"><a id="__codelineno-12-3" name="__codelineno-12-3" href="#__codelineno-12-3"></a><span class="c1"># Validate once at startup</span>
</span><span id="__span-12-4"><a id="__codelineno-12-4" name="__codelineno-12-4" href="#__codelineno-12-4"></a><span class="n">result</span> <span class="o">=</span> <span class="n">client</span><span class="o">.</span><span class="n">validate_setup</span><span class="p">()</span>
</span><span id="__span-12-5"><a id="__codelineno-12-5" name="__codelineno-12-5" href="#__codelineno-12-5"></a><span class="k">if</span> <span class="ow">not</span> <span class="n">result</span><span class="p">[</span><span class="s2">&quot;valid&quot;</span><span class="p">]:</span>
</span><span id="__span-12-6"><a id="__codelineno-12-6" name="__codelineno-12-6" href="#__codelineno-12-6"></a> <span class="k">raise</span> <span class="ne">SystemExit</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;Headroom setup invalid: </span><span class="si">{</span><span class="n">result</span><span class="p">[</span><span class="s1">&#39;issues&#39;</span><span class="p">]</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">)</span>
</span><span id="__span-12-7"><a id="__codelineno-12-7" name="__codelineno-12-7" href="#__codelineno-12-7"></a>
</span><span id="__span-12-8"><a id="__codelineno-12-8" name="__codelineno-12-8" href="#__codelineno-12-8"></a><span class="c1"># Then use client normally</span>
</span><span id="__span-12-9"><a id="__codelineno-12-9" name="__codelineno-12-9" href="#__codelineno-12-9"></a><span class="n">response</span> <span class="o">=</span> <span class="n">client</span><span class="o">.</span><span class="n">chat</span><span class="o">.</span><span class="n">completions</span><span class="o">.</span><span class="n">create</span><span class="p">(</span><span class="o">...</span><span class="p">)</span>
</span></code></pre></div>
<h2 id="debugging">Debugging<a class="headerlink" href="#debugging" title="Permanent link">&para;</a></h2>
<h3 id="enable-debug-logging">Enable Debug Logging<a class="headerlink" href="#enable-debug-logging" title="Permanent link">&para;</a></h3>
<div class="language-python highlight"><pre><span></span><code><span id="__span-13-1"><a id="__codelineno-13-1" name="__codelineno-13-1" href="#__codelineno-13-1"></a><span class="kn">import</span><span class="w"> </span><span class="nn">logging</span>
</span><span id="__span-13-2"><a id="__codelineno-13-2" name="__codelineno-13-2" href="#__codelineno-13-2"></a><span class="n">logging</span><span class="o">.</span><span class="n">basicConfig</span><span class="p">(</span><span class="n">level</span><span class="o">=</span><span class="n">logging</span><span class="o">.</span><span class="n">DEBUG</span><span class="p">)</span>
</span><span id="__span-13-3"><a id="__codelineno-13-3" name="__codelineno-13-3" href="#__codelineno-13-3"></a>
</span><span id="__span-13-4"><a id="__codelineno-13-4" name="__codelineno-13-4" href="#__codelineno-13-4"></a><span class="c1"># Shows detailed transform decisions</span>
</span><span id="__span-13-5"><a id="__codelineno-13-5" name="__codelineno-13-5" href="#__codelineno-13-5"></a><span class="c1"># DEBUG:headroom.transforms.smart_crusher:Analyzing 1000 items...</span>
</span><span id="__span-13-6"><a id="__codelineno-13-6" name="__codelineno-13-6" href="#__codelineno-13-6"></a><span class="c1"># DEBUG:headroom.transforms.smart_crusher:Kept 15 items (errors: 2, anomalies: 3)</span>
</span></code></pre></div>
<h3 id="check-stats-after-error">Check Stats After Error<a class="headerlink" href="#check-stats-after-error" title="Permanent link">&para;</a></h3>
<div class="language-python highlight"><pre><span></span><code><span id="__span-14-1"><a id="__codelineno-14-1" name="__codelineno-14-1" href="#__codelineno-14-1"></a><span class="k">try</span><span class="p">:</span>
</span><span id="__span-14-2"><a id="__codelineno-14-2" name="__codelineno-14-2" href="#__codelineno-14-2"></a> <span class="n">response</span> <span class="o">=</span> <span class="n">client</span><span class="o">.</span><span class="n">chat</span><span class="o">.</span><span class="n">completions</span><span class="o">.</span><span class="n">create</span><span class="p">(</span><span class="o">...</span><span class="p">)</span>
</span><span id="__span-14-3"><a id="__codelineno-14-3" name="__codelineno-14-3" href="#__codelineno-14-3"></a><span class="k">except</span> <span class="n">HeadroomError</span><span class="p">:</span>
</span><span id="__span-14-4"><a id="__codelineno-14-4" name="__codelineno-14-4" href="#__codelineno-14-4"></a> <span class="c1"># Check what happened</span>
</span><span id="__span-14-5"><a id="__codelineno-14-5" name="__codelineno-14-5" href="#__codelineno-14-5"></a> <span class="n">stats</span> <span class="o">=</span> <span class="n">client</span><span class="o">.</span><span class="n">get_stats</span><span class="p">()</span>
</span><span id="__span-14-6"><a id="__codelineno-14-6" name="__codelineno-14-6" href="#__codelineno-14-6"></a> <span class="nb">print</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;Last request stats: </span><span class="si">{</span><span class="n">stats</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">)</span>
</span></code></pre></div>
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